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wafer type single plate swing check valve manufacturer

April 15, 2022

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)

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

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 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

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

April 15, 2022

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)

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)

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 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

Video of resilient seated gate valve:

Principle and Maintenance of Silence Check Valve

April 12, 2022

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)

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 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

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

Difference between forged valve and cast valve

April 8, 2022

What is the difference between a forged valve and a cast valve? This article will explain to you how to distinguish between forged and cast valves.

PN40-DN100 cast steel WCB gate valve photo

forged valve:
Forged valves are forged and forged, and are generally used on high-grade pipelines with relatively small diameters, generally below DN50.
1. Forging: It is a processing method that uses a forging machine to apply pressure to a metal blank to cause plastic deformation to obtain a forging with certain mechanical properties, certain shape and size.
2. Forging materials are mainly carbon steel and alloy steel of various compositions, followed by aluminum, magnesium, titanium, copper, etc. and their alloys. The original state of the material is bar, ingot, metal powder and liquid metal. The ratio of the cross-sectional area of the metal before deformation to the die cross-sectional area after deformation is called the forging ratio. Correct selection of forging ratio has a lot to do with improving product quality and reducing costs.

Cast valve:
Casting valves are valves made by casting. Generally, the pressure levels of cast valves are relatively low (such as PN16, PN25, PN40, but there are also high-pressure ones, which can reach 1500Lb, 2500Lb), and most of the calibers are above DN50.
1. Casting: It is the process of smelting metal into a liquid that meets certain requirements and pouring it into a mold. After cooling, solidification, and cleaning, a casting (part or blank) with predetermined shape, size and performance is obtained. The basic technology of modern machinery manufacturing industry.

forged ball valve-3pcs-high PN

2. The cost of the blank produced by casting is low, and it is more economical for parts with complex shapes, especially with complex inner cavities; at the same time, it has wide adaptability and good comprehensive mechanical properties.
3. Materials (such as metal, wood, fuel, molding materials, etc.) and equipment (such as metallurgical furnaces, sand mixers, molding machines, core making machines, shakeout machines, shot blasting machines, cast iron plates, etc.) required for foundry production ) more, and will produce dust, harmful gas and noise and pollute the environment.

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

Video of center-lined butterfly valve: https://youtu.be/NuSZH_AJcwY
Video of resilient seated gate valve: https://youtu.be/AI-LT1dy2sU
Related news/knowledge:
cast steel gate valve vs stainless steel gate valve
The difference between carbon steel and cast steel
Valve material and valve standards-(1)

Structure diagram of triple eccentric butterfly valve

March 24, 2022

With the advancement of science and technology and the improvement of production technology, the industrial requirements for butterfly valves are no longer simple cut-off and adjustment of normal temperature and low pressure media, but also require butterfly valves to play a role in high temperature and high pressure environments. For this reason, the triple eccentric butterfly valve was born, and has replaced the application of some gate valves, globe valves, ball valves and other valves in the industry. What is the structure of the triple eccentric butterfly valve? What are the structural characteristics of the triple eccentric butterfly valve?

Triple eccentric butterfly valve structure

triple eccentric butterfly valve structure diagram

The triple eccentric butterfly valve is a hard-sealed butterfly valve. This kind of butterfly valve adopts the triple eccentric sealing structure and has the characteristics of compact structure, fast opening and closing speed, labor-saving and light operation, and reliable sealing performance. It is suitable for pipelines under various working conditions. media flow. Three eccentric butterfly valves are currently widely used in electric power, metallurgy, petroleum, chemical industry, urban heating and other industries.

D673H-16C-stainless steel pneumatic triple eccentric butterfly valve

1. The shape of the sealing surface of the valve body and the butterfly plate is an elliptical cone, and the center line of the sealing cone surface of the valve body and the butterfly plate has an eccentric angle c° with the center line of the valve body channel.
2. There is an axial eccentricity a between the center line of the valve body and the disc sealing surface and the valve stem shaft.
3. There is a radial eccentricity b between the center line of the valve stem and the center line of the valve body.

Triple eccentric butterfly valve sealing principle
On the basis of the double eccentric sealing butterfly valve, the center line of the valve seat and the center line of the valve body form a β angle offset. When the triple eccentric sealing butterfly valve is in a fully open state, the sealing surface of the valve plate will be completely separated from the sealing surface of the valve seat. , and the same gap y as the double eccentric sealing butterfly valve is formed between the sealing surface of the valve plate and the sealing surface of the valve seat. When the valve plate of this type of butterfly valve is opened from 0° to 90°, the sealing surface of the valve plate will be separated from the sealing surface of the valve seat at the moment of opening. When it is closed at 90° to 0°, only at the moment of closing, the sealing surface of the valve plate will contact and press the sealing surface of the valve seat.

This is the three eccentricities of the triple eccentric butterfly valve. So what are the characteristics of the triple eccentric butterfly valve structure?
1. The unique triple eccentric design, the friction coefficient between the valve body and the sealing surface of the disc is extremely small, which reduces the wear of the sealing surface and prolongs the service life of the valve.
2. The eccentric design reduces the opening and closing torque of the valve, and the opening and closing is more rapid.
3. The valve body and the disc are directly conical, as shown in the figure above, when the disc is closed, the medium exerts pressure on the disc. The conical design makes the valve more tightly closed, realizing automatic sealing and greatly improving Improve the sealing performance and truly achieve zero leakage.
4. It can be equipped with different driving methods according to customer needs or working conditions, such as installing pneumatic and electric actuators to realize automatic operation of triple eccentric butterfly valves.
5. The sealing ring on the butterfly plate is made of stainless steel sheet and flexible graphite. It has the rigidity of metal and the elasticity of non-metal, and also makes the triple eccentric butterfly valve have the advantages of metal hard sealing and elastic sealing at the same time. Good sealing performance can be achieved in low temperature environment or high temperature working condition.

If you want to know more about triple eccentric metal hard sealing butterfly valve, please pay more attention to the official website of “Tanghai Valve”. If you have the needs of this valve, you are also welcome to inquire.

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

Video of triple eccentric butterfly valve:

How to install wafer butterfly valve and installation tips

March 11, 2022

Title: How to install wafer butterfly valve

In this article, let’s talk about the installation method of the wafer butterfly valve. Wafer type is a connection method of butterfly valve, that is, when installing on the pipeline, it is necessary to clamp the butterfly valve with two pieces of flanges, and then connect it with the flange on the pipeline. Corresponding to it is another connection method of butterfly valve, flange type. The installation of flanged butterfly valve will be shared with you in the future. Today we mainly talk about how to install the wafer butterfly valve in the form of pictures and texts.

JIS 10K-wafer butterfly valve-backup seat (4)

The structure of the wafer butterfly valve is relatively short and takes up little space. During installation, use the special flange for the wafer butterfly valve to fix it, and then put the fixed wafer flange into the middle of the flanges at both ends of the pipeline, and use bolts to fix it. The control of the fluid medium in the pipeline can be realized by fixing it through the special flange of the wafer butterfly valve and the pipeline flange (if there is no flange on the pipeline, the special flange for the butterfly valve needs to be welded on the pipeline). The wafer type butterfly valve occupies a small space, which makes it especially suitable for installation and use in situations where the space is narrow or the distance between pipes is relatively small.
The specific installation steps of the wafer butterfly valve are as follows:
1. Place the wafer butterfly valve between the two pre-installed special flanges for wafer butterfly valves, and pay attention to align the flange bolt holes with the round holes of the butterfly valve body.

2. Insert the bolts and nuts into the flange holes to connect the valve body and the flange, and correct the flatness in the method, but be careful not to overtighten the bolts and nuts.

3. Weld the flange on the pipe, this step should be done by spot welding.

4. Remove the wafer butterfly valve first.

5. Weld the two flanges on the pipe completely to complete the fixation.

6. After the weld between the flange and the pipe is cooled, install the wafer butterfly valve. At this time, pay attention to opening the butterfly plate a little.

7. Correct the installation position of the butterfly valve again, and tighten the bolts, but be careful not to over-tighten them.

8. Fully open the butterfly plate of the butterfly valve to ensure that the butterfly plate of the butterfly valve can be opened and closed freely.

9. Cross the bolts again and tighten them evenly;

10. After the above steps are completed, test the opening and closing of the butterfly valve again to ensure that the valve can open and close freely.

The above is the introduction of butterfly valve installation steps. Here, I would like to tell all friends who purchase butterfly valves. Before installing the wafer butterfly valve, pay attention to the handling and do not bump it at will. After installation, non-professionals should not disassemble it casually.

Double offset-wafer butterfly valve-D72F-150lbC (1)

Manual wafer butterfly valve installation skills

1. Storage work before installation: Store the manual wafer butterfly valve in a cool, dry and ventilated environment, and cover the valve to prevent the valve from being contaminated with dust and all debris.
2. Before the wafer butterfly valve is installed on the pipeline, the pipeline needs to be calibrated, and the positions of the pipes at both ends cannot be deviated. Body strain or rupture.
3. Before the valve is installed, the valve and all installed pipelines should be cleaned again to ensure that the inside of the valve and the pipeline is completely clean, and no dust is left.
4. Manual wafer butterfly valve belongs to manual butterfly valve, which requires frequent manual operation. Therefore, there are also requirements for the installation position of the manual butterfly valve. The installation position of the valve must be convenient for personnel to operate and maintain in the future. It has been demonstrated that the best position for manual valve installation is about 1.2 meters from the operating floor. For valves installed outdoors, cover the valve with some covering to prevent bad weather from affecting the valve.
5. When installing on the pipeline, make sure that the butterfly plate is in a closed state, so as to avoid collision and damage between the butterfly plate and the pipeline flange, which will affect the sealing performance.
6. After the manual wafer butterfly valve is installed, if there is an opening and closing failure during use, it is necessary to find out the cause and eliminate the failure. It cannot be forced to open and close by beating, prying or brute force.
The above is the whole content of the “manual wafer butterfly valve installation skills” introduced for you. Here, the editor also reminds everyone that after the valve is installed, it must be regularly maintained during the use of the valve. work, so as to ensure the normal and smooth operation of the valve. If you have purchase requirements for manual wafer butterfly valves, you are welcome to consult the official website of Tanghai Valve.

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

Video of center-lined butterfly valve:

Video of double eccentric butterfly valve:

Advantages of the handle butterfly valve of Tanghai valve manufacturer

March 8, 2022

What are the advantages of handle butterfly valve? To understand this, let’s first understand the handle butterfly valve. The handle butterfly valve is a kind of manual butterfly valve. The common materials for making the handle butterfly valve are gray cast iron, ductile iron, cast steel, stainless steel, etc. The handle butterfly valve is the most common pipeline accessory in the pipeline system. It is generally required to be installed horizontally, and the

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

butterfly plate of the handle butterfly valve is installed in the diameter direction of the pipeline. The switch operation is also very simple and convenient. Rotate the handle, the handle drives the valve stem to rotate, and the circular butterfly plate rotates around the valve stem. Usually, it is turned on by turning counterclockwise, and turned off by turning clockwise. The rotation angle is 0°-90°. Between °, when the disc rotates to 90°, the valve is fully open.
The handle butterfly valve has a simple structure and small volume. It can be seen in the water treatment, urban water supply and drainage, petroleum, chemical industry, and even the cooling water system of the thermal power station.

JIS 10K-wafer butterfly valve-backup seat (4)

Tanghai Valve is committed to providing high-quality valve products and services to the society. The handle butterfly valve has always been our flagship product and one of the most satisfied products for customers. So in the highly competitive valve market, what are the advantages of the handle butterfly valve of Tanghai valve manufacturers?

1. Different handle design
The handle end of the handle butterfly valve adopts a humanized arc structure, which will not let the operator hurt his hand during operation, and it is more labor-saving to open and close.

2. Stainless steel handle bolts and disc pins
The bolts used on the handle and the pins on the butterfly plate are all made of stainless steel, and the corrosion resistance is more than 10 times that of ordinary products, making it safer to use.

3. Reinforcement at both ends of the butterfly plate
In order to prevent the instantaneous impact of the flowing medium to break the butterfly plate after the butterfly valve is installed, four reinforcing ribs are specially added at both ends of the butterfly plate.

4. Valve seat for vulcanization process
In order to ensure the sealing performance of the valve, the valve seat adopts the vulcanization process, which makes the valve seat and the valve body fit better, and the sealing surface is wider, which is more reliable than the sealing performance of ordinary butterfly valves.

5. Valve body painted with epoxy paint
If the butterfly valve is installed outdoors, the valve body is exposed, and it is easy to rust, which affects the service life of the valve. For this reason, Tanghai Valve specially sprays the valve body with epoxy resin paint, which makes the valve body of the butterfly valve more resistant to oxidation and can be safely installed outdoors.

6. Pressure test higher than the national standard
Each butterfly valve of Tanghai Valve must pass a pressure test higher than the national standard before leaving the factory.

7. Universal universal valve body
Tanghai Valve’s wafer butterfly valve adopts universal universal body, which can meet the national standard, German standard, American standard, Japanese standard, Korean standard, British standard and other standards at the same time, so as to meet the needs of different customers.

8. The natural rubber content of the valve seat exceeds 40%
The natural rubber content of the valve seat of the soft sealing butterfly valve is more than 40%, which has a longer service life than ordinary rubber.

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

Video of center-lined butterfly valve:

Structural characteristics and suitable medium of soft sealing gate valve

March 7, 2022

Structural characteristics of soft sealing gate valve:

Gate valves are mainly used in water-passing pipelines, but traditional gate valves may leak or corrode during use, which affects the performance of gate valves. As an upgraded product of traditional gate valves, the emergence of soft-sealed gate valves solves the problems of traditional gate valves that are easy to leak, easy to rust, and have poor elasticity. This article will give an introduction to the structural characteristics of soft sealing gate valves.

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

Soft sealing gate valve can be divided into dark rod soft sealing gate valve and rising rod soft sealing gate valve according to the structure. The working principle of the two structures is the same, the difference lies in the valve body structure, installation space, application range and so on. Details will be shared with you in future articles.

The structural characteristics of soft sealing gate valve are:
1. The valve body is made of ductile iron, which is lighter in weight and more conducive to installation and maintenance than traditional gate valves.
2. The valve body is coated with powder epoxy resin, which can play an anti-oxidation effect, prevent the valve body from being corroded, and is not easy to rust.
3. The traditional gate valve seat has grooves at the bottom. After the medium flows through, impurities in the medium such as stones, wood chips, iron chips and other debris will deposit and accumulate in the grooves at the bottom of the valve seat, which will cause the gate to fail to close completely over time. , causing leakage. The bottom of the valve seat of the soft-sealed gate valve is a flat-bottom design, and the medium containing impurities will not be precipitated and deposited when the valve body flows through, which ensures the sealing performance.
4. The gate of the soft-sealing gate valve is covered with high-quality rubber as a whole. The rubber and the gate are firmly attached, not easy to fall off, and have elastic memory, so that the gate and the valve seat can be tightly sealed to achieve good sealing performance. .

What medium is suitable for soft sealing butterfly valve:

In the introduction of the previous article, we learned that the sealing performance of the soft-sealed butterfly valve is superior, and it can achieve two-way sealing and zero leakage. The suitable media for soft seals are air, water, steam, various corrosive media, mud, oil, etc.
Butterfly valve can be divided into soft sealing butterfly valve and hard sealing butterfly valve according to the different sealing surface materials. The sealing surface refers to the valve seat of the butterfly valve. The sealing surface materials of the soft-seal butterfly valve we often see are EPDM, nitrile and PTFE. The three types of soft-sealed butterfly valves of different materials are also different in the applicable medium in the pipeline.

EPDM
Also called EPDM, codenamed EPDM. EPDM rubber is the most commonly used valve seat material for soft-seal butterfly valves, and it is also widely used. In the working environment of normal temperature and pressure, the use of EPDM valve seats has very good sealing performance. And EPDM rubber is resistant to ozone, aging, and has a long service life. The soft-sealed butterfly valve with EPDM as the valve seat material is suitable for fresh water, sewage, seawater and similar mud and other media containing impurities.

Nitrile
Nitrile-butadiene rubber, code-named NBR, has one of the biggest features of this material is its oil resistance is particularly good, in addition to a certain degree of wear resistance and heat resistance. The soft-sealed butterfly valve uses nitrile rubber as the sealing surface material, which can be used in oil pipelines and oily media. In addition, nitrile rubber is not suitable for medium such as fresh water, because it contains certain toxicity, which will cause harm to human health.

Teflon
PTFE is a fluoroplastic, code-named PTFE. The characteristics of PTFE are resistance to various acids and alkalis and various organic solvents; PTFE is used as the soft sealing partner of the valve seat material, which is mainly used in chemical industry, oil refining, chemical fiber, phosphate fertilizer, non-ferrous smelting, acid production, dyeing and other industries In the field, the applicable media are all corrosive strong acid and strong alkali media.
It can be seen from the above introduction that the soft sealing butterfly valve has a wide range of media and can be used in many fields. However, the soft sealing butterfly valve also has certain defects. Because of its own sealing material, it is not suitable for high temperature, high pressure and severe erosion conditions. In addition, in order to ensure the sealing performance of the soft-sealed butterfly valve, regular maintenance of its sealing surface should also be noted.

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

Video of resilient seated gate valve:

lug type dual plate check valve for marine industry-seawater

February 28, 2022

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 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)

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:

Simple structure and light weight, especially suitable for low-pressure large-diameter pipelines;
The paired clamp connection mode, the production process is simple, and the disassembly and assembly are convenient;
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

Introduction and Description of Pneumatic Butterfly Valves

February 25, 2022

This article gives an introduction and description of the pneumatic butterfly valve. Pneumatic butterfly valve is a control terminal installed on industrial pipelines. Like electric butterfly valve, it belongs to automatic control valve. Pneumatic butterfly valves are now widely used in petroleum, chemical, electric power, metallurgy and other industries. They are usually used in pipelines in these industries and are not suitable for manual operation.

D673H-16C-stainless steel pneumatic triple eccentric butterfly valve

The working principle of pneumatic butterfly valve
The pneumatic butterfly valve absorbs dry and lubricated gases through positioners, solenoid valves or other equipment, controls them, and transmits these gases to the cylinder of the pneumatic actuator. This is the air source for the pneumatic actuator to work. When the cylinder is When the internal air source is introduced into the air chamber of the pneumatic actuator, the air pressure acts on the piston, and the generated thrust drives the output shaft to rotate, and at the same time drives the valve stem and the butterfly plate to rotate, thereby completing an opening and closing action of the butterfly valve. Adding a valve positioner to the pneumatic butterfly valve can also realize the precise opening adjustment of the butterfly valve. In addition, an intelligent positioner can also be used to connect with the field bus, so as to achieve the purpose of detecting the working state of the pneumatic butterfly valve and provide diagnosis.
Under the action of the pneumatic actuator, the pneumatic butterfly valve can open and close flexibly and quickly, which ensures the safety of the pipeline. It is a control valve that is used more in industrial pipelines. The parameters of the pneumatic butterfly valve can be divided into two parts, one is the basic parameters of the butterfly valve itself, and the other is the basic parameters of the pneumatic actuator.

Valve basic parameters

Valve Name	Pneumatic Butterfly Valve
Working medium	liquid, gas, oil, etc.
Working temperature	-29—400℃
Body Material	Cast Iron, Carbon Steel, Stainless Steel, Alloy Steel
Connection form	Flange, wafer, welding
Stroke	60°90°
Fault position	Fault on, fault off, hold position
Flow characteristics	Equal percentage (EQ-%)

Basic parameters of pneumatic device

Air source pressure	0.4-0.7mpa
Ambient temperature	-20-90℃
Location of accessories	Air filter pressure reducing valve, valve positioner, electric/pneumatic converter, solenoid valve, air control reversing valve, pneumatic amplifier, quick exhaust valve, manual operating mechanism, etc.

Installation and debugging of pneumatic butterfly valve
1. Before installing and using the pneumatic butterfly valve, thoroughly clean the valve body and pneumatic device of the butterfly valve.
2. Before installation, check whether the coating of the pneumatic butterfly valve is damaged. If any damage is found, please find a professional to repair it.
3. Like the electric butterfly valve, the installation area of the pneumatic butterfly valve is generally in a working condition with a certain risk factor. In this working condition, if the valve is to be moved, an accident may occur. At this time, the site must be covered with a suitable cover. Protect it.
4. The installation position of the solenoid valve should be as close as possible to the execution cylinder, and it must be as close as possible to the execution cylinder. The size of the air pipe is related to the air capacity. Before installing the pneumatic butterfly valve, the air intake hole and the solenoid valve must be kept clean. Cylinder actuators need to be lubricated.
5. The switch of the pneumatic butterfly valve must be too fast to avoid the pressure hitting the inside of the valve body and causing danger.
The above has made a simple price and description for the working principle, parameter information and installation and debugging of the pneumatic butterfly valve. If you have purchase requirements for the pneumatic butterfly valve, you are welcome to call the Tanghai Valve Hotline for consultation.

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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