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wafer type single plate swing check valve manufacturer

Our company specializes in the production of wafer type single plate check valve, stainless steel single disc check valve, aluminum bronze single plate check valve, etc. The price is favorable and the quality is stable. Specializing in the production of valves for 16 years.

wafer type, single disc swing check valve (3)

wafer type, single disc swing check valve (3)

Single-plate check valve is an ultra-thin check valve with short structure size and single disc design. Compared with the traditional swing check valve, this series of valves has no external leakage, can be installed at any position, Good sealing performance, low linear vibration, low pressure drop and zero seat ring wear advantages.
Product name: Single plate check valve
Product model: H74H, H74W, H74X
Nominal diameter: DN50~DN1000
Structural form: single flap swing
Nominal pressure: 1.6MPa~4.0MPa
Connection method: Wafer type
Applicable temperature: -29ºC~+425ºC
Drive Mode: Media Push
Body material: cast steel, stainless steel, aluminium bronze, …
Standard: National standard GB, German DIN, American API, ANSI
Applicable medium: water, oil, steam, gas, liquid
Manufacturer: Tanghai valve

ALB Single plate check valve

ALB Single plate check valve

Product description of single plate check valve:
H74H, H74W, H74X single-plate check valve is an ultra-thin check valve with short structure size and single disc design. Compared with the traditional swing check valve, this series of valves has no external leakage, Can be installed in any position, good sealing performance, low linear vibration, low pressure drop and zero seat ring wear advantages.
The working principle of single plate check valve:
The single-plate check valve is a disc type ultra-thin check valve. The disc is attached with an O-ring seal, which has good sealing performance, and is assisted by a spring to close, and the action is sensitive. It is especially suitable for places with limited installation space. It has the advantages of simple structure, beautiful appearance, light weight and convenient installation. It is mainly suitable for water supply system, petroleum, chemical industry, metallurgy and other industrial sectors. It is most suitable for places with limited installation space.
Product features of single plate check valve:
1. The structure is very short in length, small in size and light in weight, which brings great convenience to the installation, handling and storage of pipes for the valve, and can save a lot of materials and reduce costs.
2. The valve is an integral structure, simple and compact, the impact force is small when the valve is closed, the water hammer pressure is small, the valve life is long, and the reliability is high.
3. It can be installed horizontally or vertically, and it is light in weight, and it is not necessary to set a support for the valve.
4. The flow channel is smooth, the fluid resistance is small, and the valve disc can be fully opened under a small pressure difference.
Performance parameters of single plate check valve:

Code Pressure(MPa) Temp(℃) Medium Body material
H74X-10C/16C/25C 1.0~2.5 -29~80 Water, Oil CS /SS /ALB
H74H-10C/16C/25C/40C 1.0~4.0 -29~425 Water, Oil, Gas CS /SS /ALB
H74W-10P/16P/25P/40P 1.0~2.5 ≤150 Nitric acid SS
H74Y-40P 4.0 ≤150 Nitric acid SS

Outline structure diagram and main dimensions:

video of wafer type single disc swing check valve:

TH Valve is a professional manufacturer of butterfly valvegate valvecheck valveglobe valveknife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Related news/knowledge:
Wafer type double disc swing check valve introduction
What is double plate swing check valve
Wafer type dual plate check valve: metal seated vs resilient seated
Working principle diagram of swing check valve

What are the advantages of gate valves-resilient & metal seated

The gate valve has an opening and closing gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate

DN1000-DIN-F5-NRS gate valve-IS&Y (6)

DN1000-DIN-F5-NRS gate valve-IS&Y (6)

valve is sealed by the contact between the valve seat and the gate plate. Usually, the sealing surface will be surfacing with metal materials to increase wear resistance, such as surfacing 1Cr13, STL6, stainless steel, etc. The gate has a rigid gate and an elastic gate. According to the different gates, the gate valve is divided into a rigid gate valve and an elastic gate valve.
Gate valve is a kind of valve with a large number of consultations every day. It is often used in water supply systems. The advantages of gate valves are:
1. Small flow resistance. The medium channel inside the valve body is straight, and the medium flows in a straight line. When the gate is fully opened, the internal resistance of the valve body channel is almost zero, and the flow resistance is very small.
2, opening and closing labor-saving. Whether the gate valve is open or closed, the movement direction of the gate is perpendicular to the flow direction of the medium, and the resistance of the gate to the lifting movement is also very small, and it is very labor-saving to open and close.
3. The full opening and full closing of the gate valve requires a long stroke, and the closing time is relatively long, which also makes the water hammer phenomenon less likely to occur.
4. The two sides of the gate valve channel are symmetrical, and the installation is not restricted by the flow direction of the medium, which is convenient for installation.
5. The shape is simple, the length of the structure is short, the manufacturing process is good, and the scope of application is wide.
6. Wide range of uses, gate valves are made of gray cast iron, ductile iron, cast steel, stainless steel, forged steel and other materials. Different materials can be used in different working conditions and environments, and have a wide range of applications.
Precautions for installation and use of gate valve
1. The handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited.
2. The double gate gate valve should be installed vertically (that is, the valve stem is in the vertical position and the handwheel is at the top).
3. The gate valve with bypass valve should open the bypass valve before opening (to balance the pressure difference between the inlet and outlet and reduce the opening force).
4. The gate valve with transmission mechanism shall be installed according to the provisions of the product instruction manual.
5. If the valve is frequently switched on and off, lubricate it at least once a month.
6. The gate valve is only used to fully open and fully close the medium on various pipelines or equipment, and is not allowed to be used for throttling.
7. For gate valves with handwheels or handles, auxiliary levers should not be added during operation (if the sealing is not tight, the sealing surface or other parts should be checked and repaired). Turn the handwheel and handle clockwise to close, and vice versa. The gate valve with transmission mechanism should be used in accordance with the stipulations in the product instruction manual.

gate valve (3)

gate valve (3)

The difference between a metal seated gate valve and a resilient seated gate valve:

What are the differences between hard sealing gate valves and soft sealing gate valves? This article will introduce you.

material difference:
The material of the hard sealing gate valve body is mainly cast steel, stainless steel and forged steel. The gate plate and internal flow channel seal are all made of Stellite alloy accumulation welding.
The material of the soft-sealed gate valve body is mostly cast iron, the valve plate is covered with rubber, the appearance of the soft-sealed gate valve, and the valve wall of the flow channel side are all sprayed with electrostatic powder. Not only is the appearance beautiful, but more importantly, the smoothness of the flow channel and the inner valve wall ensures that the rubber-lined gate will not be affected by the roughness of the inner valve wall when opening and closing.

difference in use:
Soft-sealed gate valve is suitable for non-corrosive gas-liquid medium at normal temperature (≤80℃). Such as water, air, oil, water treatment sewage and other pipelines. And has a good sealing effect, almost zero leakage can be achieved.
The hard-sealed gate valve is suitable for high temperature (≤425℃) with slightly corrosive gas and liquid. Such as steam, heat transfer oil, sewage, petroleum, chemical industry, metallurgy, pipeline. Can have a certain degree of wear resistance.

To sum up, the difference between a soft-sealed gate valve and a hard-sealed gate valve is that the sealing performance of the soft-sealed gate valve is better than that of the hard-sealed gate valve, but the temperature and wear resistance of the hard-sealed gate valve is better than that of the soft-sealed gate valve. Each has advantages and disadvantages.

TH Valve is a professional manufacturer of butterfly valvegate valvecheck valveglobe valveknife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Video of resilient seated gate valve:

Related news/knowledge:
What are the characteristics of the soft sealing butterfly valve
The correct operation method of manual valve
Types of Sealing Material of Electric Wafer Butterfly Valve
Fluorine-lined butterfly valve vs metal seated butterfly valve

Principle and Maintenance of Silence Check Valve

Silence check valve, also called silent check valve, muffler check valve.

The principle of silent check valve:
The silent check valve is an automatic valve, which realizes the opening and closing of the valve flap by relying on the pressure of the medium flow. When the medium flows through the valve body, the valve flap is pushed open by the

silent check valve (9)

silent check valve (9)

medium pressure, the valve is opened, and the medium flows through. When the medium stops flowing, the valve disc loses pressure and automatically closes, and blocks the backflow of the medium. The purpose of the muffler check valve is to prevent the backflow of the medium in the water supply and drainage system and the high-rise building pipe network system, to prevent the reverse rotation of the pump and the driving motor, and the discharge of the container medium.

silent check valve features:
1. The design of the valve disc is modeled after the “bullet head”, and the design of the valve body is modeled after the “waist drum”, which not only improves the flow direction of the medium, but also reduces the fluid resistance and the flow resistance coefficient.
2. The silent check valve is small in size and low in price. The structure is short and compact, and a non-metallic lubricating sleeve is installed between the guide shaft and the guide frame, which improves the flexibility of the valve disc movement, is not easy to cause locking, and can effectively eliminate the noise caused by the impact of the valve disc.
3. The skeleton rubber sealing ring is inlaid on the valve body, which avoids the direct erosion of the sealing ring by the medium and prolongs the service life of the sealing ring.
4. The opening and closing strokes of the valve disc are short, which can prevent the occurrence of water hammer.
5. The application field of silencing check valve is generally installed at the outlet of the pump in suitable drainage system and high-rise building pipe network system. In addition, the valve is not suitable for installation and use in the sewage pipe network.

The maintenance and maintenance of the silent check valve are as follows:
1) The opening and closing parts should be in the closing device during storage and transportation, and the following work should be done at the same time:
①The flap of the silent check valve should be fixed in the open position.
②The inner openings at both ends of the diameter are blocked with foam boards, and the ports must be plugged with stuffy caps to prevent dust and rust, and keep the channel clean and the end surface flat;
③ Appropriate packaging protection, shockproof and anti-collision shall be carried out for the cylinder part;
2) The silent check valve should be placed smoothly, with the pneumatic drive device facing upwards and not being squeezed against each other.
3) It should be checked regularly when placed for a long time. Every three months, check the dirt and rust on the two passages, the sealing surface, and the protection status of the welding joint. After wiping the dirt and rust, repaint the anti-rust oil for protection.
4) In order to prevent the reverse flow of the medium, check valves should be installed on the equipment, devices and pipelines;
5) silent check valve is generally suitable for clean medium, not suitable for medium containing solid particles and high viscosity;
6) Generally, vertical silent check valves should be used on horizontal pipelines with a nominal diameter of 50mm;
The silent check valve should be stored in a dry and ventilated room to prevent moisture, rain and rust.

TH Valve is a professional manufacturer of butterfly valvegate valvecheck valveglobe valveknife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Video of dual plate wafer check valve: https://youtu.be/XqRRI7o-LFI

Related news/knowledge:
Features and working principle of silent check valve
How to extend the service life of stainless steel metal seated butterfly valve
The difference and application of stainless steel 430, 304, 316

lug type dual plate check valve for marine industry-seawater

The dual plate check valve is divided into 3 types: Wafer type dual plate check valve, lug type dual plate check valve and double flanged dual plate check valve.

Classification of lug dual plate check valves: hard-seal lug dual plate check valve and soft-seal lug dual plate check valve; of which soft-seal lug check valve is divided into full-lined soft-seal lug check valve and Semi-lined/normal soft-seal lug dual plate check valve.

lug type dual plate check valve for marine industry-seawater (1)

lug type dual plate check valve for marine industry-seawater (1)

lug dual plate check valve is used for pure pipelines and industrial, environmental protection, water treatment, high-rise building water supply and drainage pipelines, to prevent the reverse flow of the medium. The check valve adopts a clamp type, the butterfly plate is two semicircles, and it adopts a spring for forced reset. The sealing surface can be built-up welding wear-resistant material or rubber lining, with a wide range of use and reliable sealing.

The check valve opening and closing parts are opened or closed automatically by the flow and force of the medium to prevent the medium from flowing back. The valve is called the check valve. Check valves belong to the category of automatic valves, which are mainly used in pipelines where the medium flows in one direction, and only allow the medium to flow in one direction to prevent accidents.

According to the structure of the check valve, it can be divided into three types: lift check valve, swing check valve and butterfly check valve. Lift check valves can be divided into two types: vertical and horizontal. Swing check valves are divided into three types: single valve, double valve and multi valve. The butterfly check valve is a straight-through type. The above-mentioned check valves can be divided into three types in connection form: threaded connection, flange connection and welding. A check valve is a valve that can automatically prevent fluid from flowing back. The disc of the check valve is opened under the action of fluid pressure, and the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the valve flap is automatically closed under the action of the fluid pressure difference, its own gravity and other factors to prevent the fluid from flowing back.

lug type dual plate check valve for marine industry-seawater (2)

lug type dual plate check valve for marine industry-seawater (2)

Model: H76X/H76H/H76W
Name: lug  dual plate check valve
Please refer to the main technical parameters and spare parts materials:
https://www.tanghaivalve.com/wafer-type-double-disc-swing-check-valve-introduction/
Product name: lug  double plate check valve (soft seal)
National Standard Number: H76X

Size range: DN40-DN1200
Pressure rating: PN10/16/25/40/64/100
Valve features: double valve plate design, short running track of the valve plate, spring load makes the valve plate close more quickly, effectively preventing water hammer
When the valve plate is opened, it is close to 90 degrees, and the pressure loss is small
Zero leakage
Size range: 2″ to 48″
Pressure range: 10bar-50 bar
Suitable flange: National standard or EN1092 PN10/PN16/PN25/PN40 or ANSI 125/150/300
Structure length: EN558 series 16, API594

Material of lug type dual plate check valve:

name materials
Valve body gray cast iron, ductile iron, carbon steel, stainless steel, aluminum bronze
Valve disc ductile iron nickel-plated, stainless steel 201, stainless steel 304, stainless steel 316, aluminum bronze
Valve stem WCB, 2Cr13, Stainless steel, Monel, duplex steel, steel alloy.
Valve seat Rubber, stainless steel, steel alloy, Super Duplex Steel
Spring 60Si2Mn、3Cr13、17-7PH、INCONEL

Uses: Suitable for installation at the outlet of high-lift pumps, or as a bottom valve in front of the pump, suitable for water, sea water, steam, oil, chemicals, chlorine, oxygen, and steam. Can be installed horizontally or vertically.
Application scope:
It is suitable for industrial, environmental protection, sewage treatment, high-rise building water supply and drainage pipelines, etc. It can also be used for environmental systems with corrosive media such as power plants and steel plants gypsum slurry.

Features of lug dual plate Check Valve:

  1. Simple structure and light weight, especially suitable for low-pressure large-diameter pipelines;
  2. The paired clamp connection mode, the production process is simple, and the disassembly and assembly are convenient;
  3. The check valve adopts the clamp type, the butterfly plate is two semicircles, and the spring is forced to reset. The sealing surface can be built-up welding wear-resistant material or rubber lining, with a wide range of use and reliable sealing.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Related news/knowledge:
Wafer type dual plate check valve: metal seated vs resilient seated
The structure and application fields of the lug type butterfly valve
Double eccentric High performance butterfly valve (TH-BTV-DE)

introduction of micro-resistance slow-closing butterfly check valve

Introduction of Micro-resistance Slow-closing Butterfly Check Valve
The structure of the butterfly check valve is very simple, and its structural length is also very short compared to other check valves. Butterfly check valve is also called butterfly check valve. The connection method is wafer type. The

micro resistance butterfly check valve (3)

micro resistance butterfly check valve (3)

valve plate is two semicircular butterfly plates. The two butterfly plates are connected by the valve stem and are forced to reset by spring. The working principle of the butterfly check valve is: when the medium flows through the valve body channel, the medium pressure is greater than the force of the spring, and the two discs are pushed open, the valve is opened, and the medium flows; when the medium stops flowing, the two discs Then due to the force of the spring, the valve is forced to reset, and the valve is closed, and the backflow of the medium is prevented at the same time.
Butterfly check valve is also known as double-clip check valve. Its sealing surface can be surfacing wear-resistant material or lined with rubber. It has a wide range of use and reliable sealing. Butterfly check valves are automatic valves and do not require manual operation. This type of valve is usually used in pure pipelines, as well as pipelines in the fields of industry, environmental protection, water treatment, and high-rise building water supply and drainage, to prevent the backflow of the medium. To prevent the reverse flow of the medium.
The main code is HH46 HH48 HH49
Micro-resistance slow-closing butterfly check valve application
It is mainly used in the supply and drainage pipelines of purified water, source water, sewage, seawater and other media. It is installed at the outlet of the pump to cut off the backflow of the medium to eliminate destructive water hammer, protect the pipeline and make the pump run safely.
Features of Micro-resistance Slow-closing Butterfly Check Valve

micro resistance butterfly check valve (4)

micro resistance butterfly check valve (4)

1. Small in size, light in weight, and only about one-third of the length of the swing check valve, it is more suitable for use in pipelines with limited space.
2. The slow closing system has excellent performance, long-term movement does not fail, can effectively control the slow closing of the valve disc, and can eliminate the destructive water hammer.
3. Rubber soft seal, good sealing performance, wear resistance, long service life and better stability. .
4. There is a closing spring on the valve disc, which opens and closes smoothly, without vibration and noise.
5. The flow channel is usually small in fluid resistance, sensitive in opening and closing of the valve plate, and good in sealing performance.
6. Compared with other check valves, the flow resistance is smaller, and it has obvious energy saving effect.

Micro-resistance slow-closing butterfly check valve main parts and materials

Part Name Material
valve body Gray cast iron, carbon steel, ductile iron, stainless steel
Disc Cast steel, ductile iron, stainless steel
stem, spring Stainless steel
Slow closing device, micro-control valve Stainless steel

Main technical parameters of micro-resistance slow-closing butterfly check valve

Nominal pressure (Mpa) Shell test pressure (MPa) Sealing test pressure (MPa) proper temperature Applicable media Slow closing time
1 1.5 1.1 ≤80℃ clean water, sewage, sea water 3-60 seconds
1.6 2.4 1.76
2.5 3.75 2.75

Product structure diagram of micro-resistance slow-closing butterfly check valve

structure diagram of micro resistance butterfly check valve

structure diagram of micro resistance butterfly check valve

The main connection dimensions of some products of the micro-resistance slow-closing butterfly check valve (unit: mm)

main dimensions-sizes of micro resistance butterfly check valve

main dimensions-sizes of micro resistance butterfly check valve

Working principle of micro-resistance slow-closing butterfly check valve

This check valve is mainly composed of a valve body, two semicircular discs, a return spring, an oil storage cylinder, a slow-closing small cylinder group, and a needle valve (micro-adjustment valve). Relying on the thrust of the imported medium, the two valve discs are pushed open smoothly. At the same time, the imported pressure medium enters the lower part of the piston in the oil cylinder, pushes the piston, and presses the oil on the upper part of the piston into the tail end of the small cylinder on both sides of the valve body through the needle valve, so that the piston rod in the small cylinder extends. When the inlet medium pressure drops below the outlet pressure, the medium will flow back, and the valve flap will automatically close under the action of the spring and the medium backflow. However, since the piston rod is in the extended position, it cannot be fully closed against the valve disc, and there is still about 20% of the area left for the medium to pass through, thus eliminating the water hammer. The valve disc is divided into two steps by the piston to quickly close first and then slowly to close, which can not only prevent the motor from reversing, but also play the role of eliminating mute.

Installation of Micro-resistance Slow-closing Butterfly Check Valve

1. The check valve can be installed horizontally (the arrow is parallel to the horizontal ground), or it can be installed vertically (the arrow is vertical to the horizontal ground).
2. Before installation, the pipeline should be cleaned, and the valve should be fully inspected to ensure that it is not damaged and then loaded into the pipeline. When loading, pay attention to the direction of the arrow and the running direction of the medium.
3. A filter should be installed at the inlet of the valve. A butterfly valve or gate valve should be installed at the outlet to facilitate the maintenance of the valve and other equipment.
4. When tightening the flange connecting bolts, attention should be paid to the symmetry, uniformity and firmness.
5. For a check valve with a working pressure greater than 1.0 MPa, the strength and tightness test should be carried out before installation, and it can be used only after passing the test. During the strength test, the test pressure is 1.5 times the nominal pressure, and the duration is not less than 5 minutes. The valve housing and packing should be qualified without leakage. During the tightness test, the test pressure is 1.1 times the nominal pressure; the duration of the test meets the requirements of GB 50243.
6. The check valve cannot bear the weight in the pipeline, and the large check valve should be supported independently so that it will not be affected by the pressure generated by the pipeline system.

Operation and debugging of micro-resistance slow-closing butterfly check valve

1. Initial test debugging
Close the needle valve on the oil reservoir clockwise, then open it counterclockwise for 3-5 turns.

2. Operation adjustment
After starting the water pump, observe whether there is oil leakage or water leakage at each connection of the slow-closing system. At the same time, use a wrench to loosen the screw plug on the needle valve body by one or two turns, so that the air in the slow-closing system can be discharged, and then quickly tighten the screw plug until there is leakage. When the pipeline pressure rises to a certain pressure, stop the pump and observe, there may be two situations at this time:

(1) The seal does not die when closed, and the motor reaches the speed of rotation faster. The reason for this phenomenon is that the opening of the needle valve is too small, and the pressure oil in the small cylinder does not return to the oil storage cylinder in a short time, so that the valve disc cannot be closed for a long time. At this point, just turn the needle valve counterclockwise half a turn to one turn.

(2) The seal is closed quickly, and the pipeline produces a great vibration sound. There are two reasons for this phenomenon: A) Because the opening of the needle valve is too large, the oil in the small cylinder quickly returns to the oil storage cylinder, that is, the valve disc is quickly closed to produce water hammer. At this time, try to close the small needle valve clockwise. If the small needle valve is closed and the pump is turned on for the second time, there is still a loud vibration when the pump is stopped again, which belongs to the reason B. B) The piston in the small cylinder does not extend. Check whether the needle valve is open, gently loosen the oil pipe joint at the small cylinder, and observe whether there is oil coming out. If there is oil leakage, it is proved that the oil circuit is unblocked. At this time, it may be because the oil in the oil storage is not enough, please refuel urgently. Refueling method: Disassemble the oil pipe joints on both sides of the needle valve, remove the needle valve counterclockwise with a wrench, insert a steel rod with a diameter of about 12mm and a length of about 300mm into the oil cylinder, and use a hammer to gently press the oil cylinder into the oil cylinder. The piston is knocked into the bottom end, at this time, add 20# oil to the oil cylinder, then install the needle valve, and then connect the copper pipe.
After the operation is adjusted, there is no need to move all parts, and it will work automatically and normally in the future.

TH Valve is a professional manufacturer of butterfly valvegate valvecheck valveglobe valveknife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Video of center-lined butterfly valve: https://youtu.be/NuSZH_AJcwY
Video of double eccentric butterfly valve: https://youtu.be/yOw2xp3bIaE
Video of triple eccentric butterfly valve: https://youtu.be/AkRwg2X1Wh0
Video of dual plate wafer check valve: https://youtu.be/XqRRI7o-LFI
Video of knife gate valve: https://youtu.be/vFSbTF_FGXM
Video of PTFE butterfly valve: https://youtu.be/Lutith_TJD0
Video of resilient seated gate valve: https://youtu.be/AI-LT1dy2sU

Related news/knowledge:

Ball check valve introduction
Slow-closing design of stainless steel swing check valve
Working Principle of Pneumatic Gate Valve
Pneumatic butterfly valve installation instructions

Which valves are used for wastewater and sewage treatment

Which valves are used for wastewater and sewage treatment? The continuous increase of water pollution in my country has made the sewage treatment and regeneration industry receive unprecedented attention. In the sewage treatment pipeline system, the valve plays a very important role.

marine valve; butterfly valve; check valve; gate valve; manufacturer in China

marine valve; butterfly valve; check valve; gate valve; manufacturer in China

Definition of sewage treatment
Sewage treatment: The process of purifying sewage in order to make it meet the water quality requirements for discharge into a body of water or for reuse. Sewage treatment is widely used in construction, agriculture, transportation, energy, petrochemical, environmental protection, urban landscape, medical treatment, catering and other fields, and is increasingly entering the daily life of ordinary people.

Sewage treatment classification
According to the classification of sewage sources, sewage treatment is generally divided into production sewage treatment and domestic sewage treatment. Production sewage includes industrial sewage, agricultural sewage and medical sewage, etc., while domestic sewage is sewage generated in daily life, which refers to the complex mixture of various forms of inorganic and organic substances, including: ① floating and suspended solid particles; ② glue shape and gel-like diffusion; ③ pure solution.
According to the quality of water pollution, there are two types of water pollution: one is natural pollution; the other is man-made pollution. At present, man-made pollution is the most harmful to water bodies. Water pollution can be divided into three categories: chemical pollution, physical pollution and biological pollution according to the different pollution impurities. The main pollutants are: (1) industrial wastewater discharged without treatment; (2) domestic sewage discharged without treatment; (3) farmland sewage with extensive use of chemical fertilizers, pesticides, and herbicides; (4) industrial waste and domestic garbage piled up by the river ; ⑸ soil erosion; ⑹ mine sewage.

Sewage treatment valve
Modern sewage treatment technology can be divided into primary, secondary and tertiary treatment according to the degree of treatment. Generally, the degree of sewage treatment is determined according to the water quality and the destination of the treated water. The valves used at each level are also different.
primary treatment
It mainly removes suspended solid pollutants in sewage, and most of the physical treatment methods can only complete the requirements of primary treatment. After primary treatment of sewage, BOD can generally be removed by about 30%, which does not meet the discharge standard. The primary treatment belongs to the preprocessing of the secondary treatment. Valves and their pipeline accessories are used: knife gate valve, triple eccentric butterfly valve, filter, etc.
secondary processing
It mainly removes colloidal and dissolved organic pollutants (BOD, COD substances) in the sewage, and the removal rate can reach more than 90%, so that the organic pollutants can meet the discharge standard, and the suspended solids removal rate can reach 95%, and the effluent effect is good. The valves used are soft-sealed butterfly valves, gate valves, ball valves, check valves, etc.
tertiary treatment
Further treatment of refractory organic matter, nitrogen and phosphorus and other soluble inorganic matter that can lead to eutrophication of water bodies. The main methods are biological denitrification and phosphorus removal, coagulation sedimentation, sand filtration, activated carbon adsorption, ion exchange and electrodialysis. The valves used are wafer butterfly valve, gate valve, ball valve, check valve, rubber soft joint, etc.

TH Valve is a professional manufacturer of butterfly valvegate valvecheck valveglobe valveknife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Video of center-lined butterfly valve: https://youtu.be/NuSZH_AJcwY
Video of triple eccentric butterfly valve: https://youtu.be/AkRwg2X1Wh0
Video of dual plate wafer check valve: https://youtu.be/XqRRI7o-LFI
Video of knife gate valve: https://youtu.be/vFSbTF_FGXM
Video of resilient seated gate valve: https://youtu.be/AI-LT1dy2sU

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How to judge whether the check valve is qualified in the factory pressure test

Check valve refers to the valve that actively opens and closes the valve flap by relying on the activity of the medium itself to avoid the back flow of the medium. It is also called check valve, one-way valve, reverse flow valve, and back pressure valve. The check valve is a kind of active valve whose primary effect is to avoid the back flow of the medium, avoid the reversal of the pump and drive motor, and the discharge of the container medium.

dual plates check valve photos-normal sealing (1)

dual plates check valve photos-normal sealing (1)

Check valves can also be used to supply supplementary lines to auxiliary systems whose pressure may rise above the system pressure. The effect of this type of check valve is to only allow the medium to move in one direction and block the movement in the opposite direction. Usually this kind of valve works actively. Under the effect of the fluid pressure moving in one direction, the valve flap opens; when the fluid moves in the opposite direction, the self-coincidence of the fluid pressure and the valve flap will affect the valve seat, and then the movement will be cut off.
Check valves can be divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis). The swing check valve has a hinge mechanism and a valve disc like a door freely leaning on the surface of the slanted valve seat. In order to ensure that the valve clack can reach the proper position of the valve seat surface every time, the valve clack is designed in a hinge mechanism so that the valve clack can meet the swing space and make the valve clack truly and comprehensively touch the valve seat. The valve clack can be made of metal, or inlaid with leather, rubber, or covered with a composition, depending on the requirements of performance. When the swing check valve is fully opened, the fluid pressure is almost unblocked, so the pressure drop through the valve is relatively small.
The valve disc of the lift check valve is located on the sealing surface of the valve seat on the valve body. Except that the disc can be lifted and lowered freely, the rest of the valve is the same as a shut-off valve. The fluid pressure lifts the disc from the sealing surface of the valve seat, and the backflow of the medium causes the disc to fall back to the seat and cut off the movement. According to the operating conditions, the valve disc can be an all-metal structure, or it can be inlaid with a rubber pad or a rubber ring on the disc holder. Like the stop valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow rate of the swing check valve is restricted. rare.

all types of check valve and structures -code names-photos

all types of check valve and structures -code names-photos

Check valve experiment status
The flap axis of the lift check valve is in an orientation straight with the horizontal; the channel axis of the swing check valve and the flap axis are in an orientation approximately parallel to the horizontal line.
In the strength test, the test medium is introduced from the inlet end to the specified value, and the other end is closed, and the valve body and bonnet are qualified without leakage.
In the sealing test, the test medium is introduced from the outlet end, and the sealing surface is checked at the inlet end. No leakage at the packing and gasket is qualified.

TH Valve is a professional manufacturer of butterfly valvegate valvecheck valveglobe valveknife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Video of dual plate wafer check valve:

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Wafer type dual plate check valve: metal seated vs resilient seated

Wafer dual plate check valve is used for pure pipelines and industrial, environmental protection, water treatment, high-rise building water supply and drainage pipelines, to prevent the reverse flow of the medium. The check valve adopts a clamp type, the butterfly plate is two semicircles, and it adopts a spring for forced reset. The sealing surface can be built-up welding wear-resistant material or rubber lining, with a wide range of use and reliable sealing.

The check valve opening and closing parts are opened or closed automatically by the flow and force of the medium to prevent the medium from flowing back. The valve is called the check valve. Check valves belong to the category of automatic valves, which are mainly used in pipelines where the medium flows in one direction, and only allow the medium to flow in one direction to prevent accidents.

According to the structure of the check valve, it can be divided into three types: lift check valve, swing check valve and butterfly check valve. Lift check valves can be divided into two types: vertical and horizontal. Swing check valves are divided into three types: single valve, double valve and multi valve. The butterfly check valve is a straight-through type. The above-mentioned check valves can be divided into three types in connection form: threaded connection, flange connection and welding. A check valve is a valve that can automatically prevent fluid from flowing back. The disc of the check valve is opened under the action of fluid pressure, and the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the valve flap is

H46-double flanged dual plate check valve-metal seated

H46-double flanged dual plate check valve-metal seated

automatically closed under the action of the fluid pressure difference, its own

lug type dual plate check valve metal seated (3)

lug type dual plate check valve metal seated (3)

gravity and other factors to prevent the fluid from flowing back.

klug type dual plate check valve metal seated (1)The dual plate check valve is divided into flange dual plate check valve, lug dual plate check valve and wafer dual

plate check valve.

Classification of wafer dual plate check valves: hard-seal wafer dual plate check valve and soft-seal wafer dual plate check valve; of which soft-seal wafer check valve is divided into full-lined soft-seal wafer check valve and Semi-lined/normal soft-seal wafer dual plate check valve.

Features of Wafer dual plate Check Valve:

  1. Simple structure and light weight, especially suitable for low-pressure large-diameter pipelines;
  2. The paired clamp connection mode, the production process is simple, and the disassembly and assembly are convenient;
  3. The check valve adopts the clamp type, the butterfly plate is two semicircles, and the spring is forced to reset. The sealing surface can be built-up welding wear-resistant material or rubber lining, with a wide range of use and reliable sealing.

Model: H76X/H76H/H76W
Name: Wafer dual plate check valve
Please refer to the main technical parameters and spare parts materials:
https://www.tanghaivalve.com/wafer-type-double-disc-swing-check-valve-introduction/
Product name: Wafer double plate check valve (soft seal)
National Standard Number: H76X

dual plates check valve photos-normal sealing (1)

dual plates check valve photos-normal sealing (1)

Size range: DN40-DN1200
Pressure rating: PN10/16/25/40/64/100
Valve features: double valve plate design, short running track of the valve plate, spring load makes the valve plate close more quickly, effectively preventing water hammer
When the valve plate is opened, it is close to 90 degrees, and the pressure loss is small
Zero leakage
Size range: 2″ to 48″
Pressure range: 10bar-50 bar
Suitable flange: National standard or EN1092 PN10/PN16/PN25/PN40 or ANSI 125/150/300
Structure length: EN558 series 16, API594

Body material: gray cast iron, ductile iron, carbon steel, stainless steel, aluminum bronze
Valve plate material: ductile iron nickel-plated, stainless steel 201, stainless steel 304,

dual plates check valve photos- full rubber

dual plates check valve photos- full rubber

stainless steel 316, aluminum bronze
Valve seat material: nitrile NBR, EPDM, oil and acid and alkali resistant fluorine rubber VITON-A, steam resistant fluorine rubber VITON-B, hard seal
Uses: Suitable for installation at the outlet of high-lift pumps, or as a bottom valve in front of the pump, suitable for water, sea water, steam, oil, chemicals, chlorine, oxygen, and steam. Can be installed horizontally or vertically.
Application scope:
It is suitable for industrial, environmental protection, sewage treatment, high-rise building water supply and drainage pipelines, etc. It can also be used for environmental systems with corrosive media such as power plants and steel plants gypsum slurry.

 

Product name: Wafer double plate check valve (metal seated)
National standard number: H76H(W)-16C(16P, 16R, 16RL)
Size range: DN40-DN1200

H76-wafer type dual plate check valve metal seated

H76-wafer type dual plate check valve metal seated

Pressure rating: PN10/16/25/40/64/100
Temperature range: -20℃ -350℃
Body material: WCB, A105, CF8, CF3, CF8M.CF3M and other materials and special steel
Valve plate material: WCB, A105.2CR13, 304.304L.316.316L and other materials and special steel
Valve shaft material: A105.2CR13, 304.304L.316.316L and other materials and special steel
Valve seat material: 2CR13, 304.304L.316.316L, STL and other materials and special steel
Application range: water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and urea and other media
More video for wafer dual plate check valve, please see below:
https://www.youtube.com/watch?v=pGrkznOd-JA
https://youtu.be/etwT8RX-S3Q
https://www.youtube.com/watch?v=XqRRI7o-LFI

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

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Maintenance Methods of Common Valves

Common valve failures include leakage, opening and closing parts damage and failure, etc. One of the most important reasons for the valve failure problem is that the valve is not well maintained. The valve is an important part of the pipeline transportation system. Maintenance and maintenance can make the valve better serve us. At the same time, it can also prevent valve failure from the source and reduce production accidents caused by valve failure. Therefore, this article will talk about the maintenance methods of commonly used valves.

marine valve; butterfly valve; check valve; gate valve; manufacturer in China

marine valve; butterfly valve; check valve; gate valve; manufacturer in China

1. For valves that are not in use for a long time, they must be cleaned regularly to remove dirt and dust on the exposed surface of the valve, and at the same time, they must be sealed to ensure that the inside of the valve is clean and dry. Store the valve neatly in a ventilated and dry place indoors, and it is strictly forbidden to stack it or store it in the open air. When storing, the butterfly valve is the easiest to store, just keep the butterfly plate in the closed state. For gate valves, globe valves and check valves, both ends of the passage should be blocked during storage, and the valve plate should be closed. The storage of the ball valve requires that both ends are blocked and in an open state.
2. Before installing the valve, you need to check the pressure and diameter of the valve again, and clean up the dirt on the valve during transportation.
3. When installing the valve, install the valve correctly according to the connection method of the valve. Generally, the commonly used valves can be installed at any position in the pipeline, but it is necessary to consider whether the operation of the operator is convenient after installation and whether it is convenient for future valve maintenance .
4. When the gate valve and ball valve are working, they are only used for fully open and fully closed. They cannot be used for flow adjustment, otherwise the sealing surface will be severely washed and corroded, and the opening and closing parts of the valve will be greatly worn.
5. When the handle valve and handwheel valve are opened or closed, levers, wrenches or other tools cannot be used to avoid damage to the valves.
6. Tighten the bolts on the valve packing gland evenly. Don’t beat the gland to make the gland tilt, which will damage or hinder the movement of the valve stem and cause valve leakage.
7. During use, the valve should be maintained regularly to keep the valve clean, and the transmission part should be regularly lubricated. Once the valve is found to be malfunctioning, it must be stopped immediately to find out the cause of the malfunction and clean up the malfunction.

TH Valve is a professional manufacturer of butterfly valvegate valvecheck valveglobe valveknife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

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Commonly used valves for Water Supply and Drainage System

Valves often used in water supply and drainage piping systems include butterfly valvegate valvecheck valve.
This article introduces common water supply and drainage system valves one by one.
1. Butterfly valve: a simple regulating valve, generally used in low-pressure medium pipelines for cutting off and intercepting. It is also one of the common valves in water supply and drainage piping systems. It regulates and intercepts the flow of water on the water supply and drainage pipeline. The butterfly valve is small in size, light in weight, easy to install and operate, but the opening and closing torque is relatively large.

ductile iron, DI, butterfly valve, manufacturer, center line, TH valve

ductile iron, DI, butterfly valve, manufacturer, center line, TH valve

The butterfly valve can be divided into wafer butterfly valve and flange butterfly valve according to the connection mode; according to the different driving mode, it can be divided into handle butterfly valve, turbine butterfly valve, electric butterfly valve, pneumatic butterfly valve, etc.
2. Gate valve: It can only be a kind of valve that can cut off the flow of the pipeline medium. The structure of the gate valve is more complicated. It can only be fully opened and fully closed. The opening and closing torque is small, the fluid resistance in the pipeline is small, and it can flow in both directions. The gate valve is most suitable for media that does not contain particles, such as water, because the sealing surface of the gate is easy to wear with impurities or particles in the medium. In addition, impurities precipitate to the bottom of the valve body, which will affect the sealing performance of the gate valve. Causes the defect that the valve is not closed tightly.

dual plate wafer type check valve (1)

dual plate wafer type check valve (1)

The gate valve is only suitable for use in pipelines that need to be normally open or normally closed, because if the gate valve is frequently opened and closed, it may cause the valve plate to fall off and make the system lose its control ability.
The gate valve can be divided into parallel plate gate valve and wedge plate gate valve according to the difference of the gate. According to the difference of valve stem, it can be divided into open stem gate valve and dark stem gate valve.
3. Shut-off valve: similar to gate valve, the functions of the two are similar when the medium in the pipeline is cut off. But the difference between the globe valve and the gate valve is that the globe valve has a simpler structure and is more convenient to maintain, but the force used to switch the valve is greater than that of the gate valve. In addition, the globe valve is a one-way valve. When installing, pay attention to the valve body. The instructions on the operation must not be reversed.
4. Check valve: It is also a list valve and check valve, which has strict directio

AWWA C509-C515-resilient seated wedge gate valve-DN80-150lb (4)

AWWA C509-C515-resilient seated wedge gate valve-DN80-150lb (4)

nality and stipulates that the medium is only allowed to flow in one direction. The check valve is used in pipelines where the medium is water, and is mainly used to prevent backflow of water.
Commonly used check valves include butterfly check valves, muffler check valves, swing check valves and so on. When installing, according to the type of valve, determine whether to install on a vertical pipeline or a horizontal pipeline, and install it strictly in the direction marked by the arrow on the valve body, and the installation cannot be reversed.

TH Valve is a professional manufacturer of butterfly valvegate valvecheck valveglobe valveknife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

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