Tag Archive for: valve

Posts

What are the accessories for pneumatic valves?

Pneumatic valves have the advantages of fast switching and low price. Correct selection of pneumatic valves requires the use and characteristics of related accessories to achieve stable performance and long service life. In addition to improving the quality of the valve, it is also The matching of accessories is also very important. Here, I will introduce the characteristics and uses of several main accessories of pneumatic valves.

pnumatic actuator for butterfly valve

pnumatic actuator for butterfly valve

Accessory 1: Solenoid valve

The exact name of the solenoid valve should be the electromagnetic directional valve. The solenoid valve equipped with pneumatic valve mainly has two five-way and two-way three-way. The two-position five-way solenoid valve is usually used in conjunction with a double-acting pneumatic actuator, and the two-position three-way solenoid valve is used in conjunction with a single-acting pneumatic actuator. The pneumatic valve is used to switch the air intake and the air source through the solenoid valve. The air is discharged to achieve the function of opening and closing the valve. The solenoid valve has a single electric control solenoid valve and a double electric control solenoid valve. Explosion-proof solenoid valves should be used in special flammable and explosive occasions.

5 double-eccentric-butterfly-valve-2

5 double-eccentric-butterfly-valve-2

Accessory 2: Limit switch

The limit switch is a long-distance transmission signal for opening or closing of the valve. The explosion-proof limit switch should be used in special flammable and explosive occasions.

Accessories 3: Air source treatment triple

Air source treatment triples include pressure reducer, filter, and oil mist device. The pressure reducer is mainly used to stabilize the air source and can adjust the pressure of the cylinder. The greater the pressure, the faster the valve opening and closing speed, which increases the friction of the valve and easily damages the sealing ring, thus affecting the service life of the valve; filter and The lubricator can filter the impurities in the air, clean and automatically add lubricant to the cylinder. Therefore, we recommend that the user is equipped with a three-piece valve for each valve, so that the pneumatic actuator can be better maintained and used for a longer time.

Product features and advantages of ball valve

Product features of ball valve:
1. The three-way ball valve adopts an integrated structure in structure, with a four-sided valve seat sealing type, fewer flange connections, high reliability, and a lightweight design.

ball valve (8)

ball valve (8)

2. The three-way ball core is divided into T type and L type, with long service life, large circulation capacity and low resistance.

3. The ball valve is divided into two types: single-acting and double-acting according to the action type. The single-acting type is characterized in that once the power source fails, the ball valve will be in the state required by the control system.

Advantages of ball valve:

1. The fluid resistance is small, and its resistance coefficient is equal to that of a pipe section of the same length.

2. Simple structure, small size and light weight.

3. It is tight and reliable, and the sealing surface material of the ball valve is widely used in plastics and has good sealing performance. It has also been widely used in vacuum systems.

4. It is easy to operate and open and close quickly. It only needs to rotate 90° from fully open to fully closed, which is convenient for remote control.

5. The maintenance is convenient, the structure of the ball valve is simple, the sealing ring is generally movable, and it is convenient to disassemble and replace.

6. It has a wide range of applications, with a diameter ranging from a few millimeters to a few meters, and can be applied in high vacuum or high pressure.

This type of valve is a high-pressure ball valve commonly used in existing mines. It bears high pressure and adopts a U-shaped card quick connection method. It can be quickly installed and disassembled in the daily production and use of the mine, and is convenient to use.

The ash unloading ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. The ash unloading ball valve can be divided into floating ball type, fixed ball type, and elastic ball type. The ash unloading ball valve is mainly used to cut off or connect the medium in the pipeline. It can also be used for fluid adjustment and control. The ash unloading ball valve Compared with other valve types, it has angular stroke output torque, opens quickly, is stable and reliable, and is widely applicable. The working principle of the ash unloading ball valve is to make the valve unblocked or blocked by rotating the valve.

Electric ball valve structure is composed of only a few parts, saving data; small size, light weight, small installation size, electric ball valve structure diagram, small driving torque, pressure regulating valve, easy and agile operation, only need to rotate 90° Fast opening and closing; and also has a good flow regulation effect and sealing characteristics at the same time, in the application of large and medium caliber, medium and low pressure, electric ball valve is the dominant valve form. When the electric ball valve is in the fully open position, the thickness of the butterfly plate is the resistance when the medium flows through the valve body, so the pressure drop that occurs through the valve is small, so it has better flow control characteristics. Electric ball valves have two sealing types: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be embedded in the valve body or attached to the periphery of the butterfly plate. Valves with metal seals generally have a longer life than valves with elastic seals, but it is difficult to achieve a complete seal. Metal seals can adapt to higher operating temperatures, while elastic seals have the disadvantage of being limited by temperature. If the electric ball valve is requested to be used as a flow control, it is important to accurately select the size and type of the valve. The construction principle of the electric ball valve is particularly suitable for manufacturing large diameter valves. Electric ball valves are not only widely used in general industries such as petroleum, gas, chemical, and water disposal, but also used in cooling water systems of thermal power stations. Commonly used electric ball valves include wafer type electric ball valves and flange type electric ball valves. Wafer type electric ball valve uses double-head bolts to connect the valve between two pipe flanges. Flange type electric ball valve is equipped with flanges on the valve. The two flanges on the valve are connected to the pipe flanges with bolts. The strength performance of the valve refers to the ability of the valve to withstand medium pressure. The valve is a mechanical product that is subjected to internal pressure, so it must have sufficient strength and rigidity to ensure long-term use without cracking or deformation. Pneumatic ball valve is composed of ball valve and pneumatic actuator. Pneumatic actuator is divided into double-acting pneumatic actuator and single-acting pneumatic actuator. Through solenoid valve control, ball valve switching action is realized. The pneumatic ball valve can realize intelligent control, quickly open or close the pipeline, and can effectively control and manage the pipe network.

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:
What is a ball valve?;
Electric ball valve principle | Electric ball valve working principle;
Classification and advantages of gate valve;
Advantages and disadvantages of butterfly valve and structure diagram;

Features and working principle of silent check valve

Silent check valve refers to a valve that automatically opens and closes the disc depending on the flow of the medium itself to prevent the medium from flowing back. It is also called check valve, one-way valve, silence check valve, reverse flow valve, and back pressure valve. Check valve is a kind of automatic valve, its main function is to prevent the back flow of the medium, prevent the pump and drive motor from reversing, and discharge the container medium. Check valves can also be used to supply pipelines for auxiliary systems whose pressure may rise above the system pressure. Check valves can be divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).
Features of silent check valve:
1. The valve clack adopts a “bullet” shape design, and the valve body adopts a “waist drum” shape design to improve the flow direction of the medium and reduce the flow resistance coefficient.

2. The valve adopts a short structure. Although the head loss is slightly larger than that of the lift-type silent check valve, it is small in size and inexpensive.

3. Compact structure, non-metallic lubrication sleeve is installed between the guide shaft and the guide frame, and the valve flap can be raised and lowered flexibly without locking phenomenon.

4. The skeleton type rubber sealing ring is directly embedded in the valve body, which avoids the direct erosion of the sealing ring by the medium for a long time, and the service life is si

silent check valve (11)

silent check valve (11)

gnificantly prolonged, and it is strong and durable.

5. The valve flap has a short opening and closing stroke, which can effectively prevent water hammer

6. It is suitable for water supply and drainage system and high-rise building pipe network. It can be installed at the outlet of the pump. The structure is slightly modified, and it can be used as a suction bottom valve, but it is not suitable for sewage pipe network.

7. It has small size, light weight, low fluid resistance, fatigue resistance and long life
working principle of silent check valve:
When the medium flows in the specified direction, the valve flap is opened by the force of the medium; when the medium flows backward, the valve flap is tightly closed with the sealing surface of the valve seat due to the weight of the valve flap and the opposing force of the medium. Closed to achieve the purpose of preventing the backflow of the medium.

Check valve is an automatic valve, its main function is to prevent the back flow of the medium, prevent the pump and drive motor from reversing, and the release of the container medium. Check valves can also be used to supply pipelines for auxiliary systems whose pressure may rise above the system pressure.

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:
Introduction of cast steel lift swing check valve;
The difference between globe valve and check valve;
Working principle diagram of lift check valve;

Swash plate type non-impact check valve

“Swash plate check valve” generally refers to tilting disc swing check valve.

Chinese name: PXH44H-150LB swash plate type non-impact check valve

8 tilting-disc-swing-check-valve-3

8 tilting-disc-swing-check-valve-3

Structure length: ASME B16.10
Product design press: ASME B16.34
Inspection and testing: API 598

PXH44H-150LB swash plate type non-impact check valve details:

1. Product overview:

It is a new type of check valve developed by combining our company’s many years of valve production technology with foreign advanced product design and development. Its main advantage is to overcome the impact and water hammer caused by the swing check valve and the lift type upper return valve under working conditions. Phenomenon, to achieve no impact operation.

2. Design specifications:

Flange size according to: ASME B16.5 GB HG SH

Pressure rating: Class 150, 300, 600 PN 2.0, 5.0, 10.0 MPa

3. Structural features:

The double eccentric valve flap gradually contacts the sealing surface when it is closed, so that it can work without impact and noise.

Micro-elastic metal seat with good sealing performance.

Butterfly valve disc design, fast, sensitive and long service life.

The swash plate structure makes the fluid channel streamlined, with low flow resistance and energy saving effect.

4. Materials for main parts:

code valve body valve flap valve sealing/seat
P CF8 CF8+STL 0Cr19Ni9 PTFE
R CF8M CF8M+STL 0Cr17Ni12Mo2
K CF3 CF3+STL 00Cr19Ni11
J CF3M CF3M+STL 00Cr17Ni14Mo2
E CN7M CN7M+STL 20 alloy
C WCB WCB+13Cr 0Cr19Ni9
D LCB CF8+STL 0Cr19Ni9

5. Main properties:

Items normal swing check valve swash plate type non-impact check valve
Closing force big small(about 1/5~1/8 of the former)
compact force big None
sealing  performance as per API 598, leakages allowed can realize no leakage
flow resistance big(ξ=1.3~2.5) small(ξ=0.18~0.6)
flow ability small(Cv=76) big(Cv=154~333)
weight big small(about 80% of former)

Related news /knowledge:
Current status and development of Chinese valves;
Classification of check valves;
What is double plate swing check valve;
Wafer type double disc swing check valve introduction;

How does a butterfly valve work?

A butterfly valve is a valve that uses a disc-type opening and closing part to reciprocate around 90° to open, close, or regulate the flow of media. Butterfly valves are not only simple in structure, small in size, light in weight, low in material consumption, small in installation size, small in driving torque, easy in operation and fast, but also can have good flow adjustment function and close sealing characteristics at the same time. One of the fastest valve varieties. Butterfly valves are one of the fastest growing valve varieties in the past decade.

Butterfly valves are widely used. The variety and quantity of its use are still continuing to expand, and develop to high temperature, high pressure, large diameter,

Double flange butterfly valve (16)

Double flange butterfly valve (16)

high sealing, long life, excellent adjustment characteristics, and multi-function development of one valve. Its reliability and other performance indicators have reached a high level. With the application of chemically resistant synthetic rubber on butterfly valves, the performance of butterfly valves has been improved. Because synthetic rubber has the characteristics of corrosion resistance, erosion resistance, dimensional stability, good resilience, easy forming, and low cost, and can choose different performance synthetic rubber according to different use requirements to meet the working conditions of butterfly valves.

Polytetrafluoroethylene (PTFE) has strong corrosion resistance, stable performance, not easy to aging, low friction coefficient, easy to form, stable in size, and can be filled and added with appropriate materials to improve its comprehensive performance, resulting in better strength and friction coefficient The lower butterfly valve sealing material overcomes the limitations of synthetic rubber. Therefore, polymer polymeric materials represented by PTFE and its filling modified materials have been widely used in butterfly valves. Therefore, the performance of butterfly valves has been further improved, resulting in a wider temperature and pressure range and sealing performance, reliable and longer life butterfly valve.

butterfly valve working diagram-3D GIF animated presentation

butterfly valve working diagram-3D GIF animated presentation

In order to meet the requirements of industrial applications such as high and low temperature, strong erosion, and long life, metal seal butterfly valves have been greatly developed. With the application of high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion resistance, and high strength alloy materials in butterfly valves, metal sealed butterfly valves have been widely used in industrial fields such as high and low temperature, strong erosion, and long life. The emergence of butterfly valves with large diameter (9~750mm), high pressure (42.0MPa) and wide temperature range (-196~606℃) has brought the technology of butterfly valves to a whole new level.

When the butterfly valve is fully opened, it has a small flow resistance. When the opening is between about 15°~70°, the sensitive flow control can be performed, so the application of butterfly valves is very common in the field of large-diameter adjustment. Because the movement of the butterfly plate of the butterfly valve is wiping, most butterfly valves can be used for media with suspended solid particles. Depending on the strength of the seal, it can also be used in powder and granular media. Butterfly valves are suitable for flow regulation. Because the pressure loss of the butterfly valve in the pipe is relatively large, about three times that of the gate valve, when selecting the butterfly valve, the influence of the pressure loss of the pipeline system should be fully considered, and the strength of the butterfly plate to withstand the pressure of the pipeline medium when closing . In addition, the working temperature limit of the elastic seat material must be considered at high temperatures.

The structure length and overall height of the butterfly valve are small, the opening and closing speed is fast, and it has good fluid control characteristics. The structure principle of butterfly valve is most suitable for making large-diameter valve. When the butterfly valve is required for flow control, the most important thing is to correctly select the size and type of the butterfly valve so that it can work properly and effectively. Generally, in throttling, regulating control and mud medium, the structure length is short, the opening and closing speed is fast, and cut off at low pressure (small pressure difference). It is recommended to use a butterfly valve. Butterfly valves can be used when there are two-position adjustment, reduced diameter channels, low noise, cavitation and vaporization, a small amount of leakage into the atmosphere, and abrasive media.

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 /knowledges: Introduction of U-shaped flange butterfly valve; The working principle of butterfly valve (picture)

Butterfly valve and its Development history – (2)

China’s valve industry chain is numerous, but it is not a valve power. Generally speaking, my country has entered the ranks of the world’s valve power, but from the perspective of product quality, my country still has a long gap from the valve power. The low production concentration of the industry, the low R&D capacity of

TH valve products

TH valve products

valves supporting high-end products, and the low level of manufacturing technology in the valve industry still exist, and the import and export trade deficit continues to expand. There are absolutely not so many valve companies that can really survive in the market. However, this high-speed shock in the valve industry will bring huge opportunities, and the result of the shock will make the market operate more rationally. The road to localization of high-end valves is unusually bumpy. Basic parts have become a short board that restricts the development of my country’s manufacturing industry to high-end. During the 12th Five-Year Plan period, the government will continue to increase the localization of high-end equipment parts. Here we select a few key mentioned in the “Implementation Plan” to develop a representative valve industry for import substitution feasibility analysis. It can be seen from the analysis that the feasibility of valve import substitution in various sub-industries varies greatly, and high-end valves urgently need more policy guidance and scientific research support.

The valve industry plays an important role in the development of the national economy as an important link in the equipment manufacturing industry. Since China’s domestic valve manufacturing level still has a certain gap compared with the international advanced level, many high-parameter, high-temperature, high-pressure, and high-pound key valves have always relied on imports. Relevant state departments in accordance with the national requirements for major equipment localization, A series of major deployments have been made successively, and led by the National Development and Reform Commission, the China National Machinery Industry Federation and the China General Machinery Industry Association have deployed and formulated a valve localization plan for major equipment in related fields, and have coordinated with relevant departments many times. Localization has formed a consensus in the domestic valve industry. Actively adopt international standards for product design; absorb foreign excellent design structures (including patented technology); product testing and performance inspection are strictly in accordance with international standards; absorb foreign production process experience and attach importance to the research and promotion of new materials; understand the high imports The technical parameters and working conditions of valve products are the way to speed up the process of localization, promote the continuous updating of valve products, and fully realize the localization of valves. With the acceleration of the reorganization of the valve industry, the future industry will be the competition between the quality and safety of valve products and product brands. The products are developing toward high technology, high parameters, strong corrosion resistance, and long life. Only through continuous technological innovation, development New products and technical transformations can gradually improve the technical level of products, meet the domestic equipment, and fully realize the localization of valves. Under the huge demand environment, my country’s valve manufacturing industry will surely present a better development prospect.

Tianjin Tanghai Valve Manufacturing Co., Ltd. is one of the largest butterfly valve manufacturers in China. It was founded in 2006. Its predecessor was Tanghai Valve Manufacturing Factory. Now we have our own independent R & D, manufacturing, assembly and warehousing workshops; we have professional pre-sale and after-sale technical support and perfect services. Our main products: butterfly valve, lug type butterfly valve, wafer type butterfly valve, U-type butterfly valve, double flange butterfly valve, gate valves, check valves, globe valves, valve parts (Valve body, Valve disc, Valve shaft, Valve seat…),

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 /products:
Industry development prospects of check valve;
working principle of electric globe valve;
Knowledge;
Butterfly valve and its Development history – (1);