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Common failures of butterfly valves and the characteristics of installation

July 17, 2020

Common errors of butterfly valves:
The rubber elastomer in the butterfly valve will tear, wear, aging, perforate or even fall off during continuous use. The traditional thermal vulcanization process is

Double flange butterfly valve (16)

difficult to meet the needs of on-site repair. Special equipment is used for repair, which consumes a lot of heat and electricity, which takes time and effort. Today, we use new method gradually of adopting polymer composite materials to replace traditional methods. The superior adhesion and excellent wear and tear resistance of its products ensure that the repair cycle reaches or even exceeds the life cycle of new parts, greatly reducing downtime.

Installation and maintenance of butterfly valves:
1. During installation, the valve disc should stop at the closed position.
2. The opening position should be determined according to the rotation angle of the butterfly valve disc.
3. Butterfly valves with bypass valves should be opened before opening.
4. The installation should be carried out according to the manufacturer’s installation instructions. The heavy butterfly valve should be installed with a solid foundation.

Construction and installation points
1. The installation position, height, and direction of entrance and exit must meet the design requirements, and the connection should be firm and tight. The handles of all kinds of manual valves installed on thermal insulation pipes must not be downward.
2. The valve must be visually inspected before installation, and the nameplate of the valve should comply with the customer’s national standards. For valves with a working pressure greater than 1.0 MPa and acting as a shut-off on the main pipe, strength and tightness performance tests should be carried out before installation, and qualified before use. During the strength test, the test pressure is 1.5 times the nominal pressure, the duration is not less than 5min, and the valve housing and packing should be leak-free. During the tightness test, the test pressure is 1.1 times the nominal pressure; the test pressure lasts no less than 120 seconds during the test, and the valve flap sealing surface is qualified as no leakage.

Tianjin Tanghaidongyang valve Co., Ltd. is one of the largest butterfly valve manufacturers in China, main products are butterfly valves, check valves. Products range: 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 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

Applicable occasions of butterfly valve

July 14, 2020

Butterfly valves are suitable for flow regulation. Because the pressure loss of the butterfly valve in the pipeline is relatively large, the robustness of the butterfly plate to withstand the pressure of the pipeline medium when closing should also be considered. In addition, the working temperature limit of the elastic seat material

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

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 the butterfly valve is most suitable for making large-diameter valves. 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, adjustment control and mud medium, the structure length is required to be short, and the opening and closing speed is fast (1/4 turn). Low pressure cut-off (small differential pressure), butterfly valve is recommended.

Butterfly valve can be used when there are two-position adjustment, narrowing channel, low noise, cavitation and gasification, small leakage into the atmosphere, and abrasive media.

Throttle adjustment under special working conditions, or strict sealing requirements, or severe wear, low temperature (cryogenic) and other working conditions when using butterfly valves, need to use special design metal seal triple-eccentric or double eccentric Butterfly valve with adjustment device.

5 double-eccentric-butterfly-valve-2

The butterfly valve is suitable for requirements to achieve complete sealing, zero gas test leakage, high life requirements, and operating temperature between -10 degrees and 150 degrees. Applicable medium is fresh water, sewage, sea water, salt water, steam, natural gas, food, medicine, oil products And various acids and bases.

The soft seal eccentric butterfly valve is suitable for bidirectional opening and closing and adjustment of the ventilation and dust removal pipeline, and is widely used in gas pipelines and water channels in metallurgy, light industry, electric power, and petrochemical systems.

The metal-to-metal line sealed double eccentric butterfly valve is suitable for gas, oil, acid and alkali pipelines such as urban heating, gas supply, water supply, etc., as a regulating and throttling device.

In addition to being used as a large-scale pressure swing adsorption (PSA) gas separation device program control valve, the metal-to-metal face sealed triple-eccentric butterfly valve can also be widely used in the fields of petroleum, petrochemical, chemical, metallurgy, electric power, etc. as replacement product.

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

How to choose the right butterfly valve (2)

July 13, 2020

However, the following problems still exist during the use of this butterfly valve:
1. Due to the multi-layer soft and hard laminated seal ring fixed on the valve plate, when the valve plate is normally open, the medium forms a frontal flush on the sealing surface. The soft sealing tape in the metal sheet interlayer is directly affected by the flushing, which directly affects the sealing performance.

U-type flange butterfly valve, ductile iron, DI, center line,

2. Restricted by structural conditions, the structure is not suitable for valves with a diameter of DN200 or less, because the overall structure of the valve plate is too thick and the flow resistance is large.
3. Due to the principle of the three-eccentric structure, the sealing between the sealing surface of the valve plate and the valve seat is caused by the torque of the transmission device to press the valve plate against the valve seat. In the positive flow state, the higher the medium pressure, the tighter the seal extrusion. When the medium in the flow channel reverses flow, as the medium pressure increases, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, and the seal begins to leak.

The high-performance triple-eccentric bidirectional hard seal butterfly valve is characterized in that the valve seat sealing ring is composed of multiple layers of stainless steel sheets on both sides of a soft T-shaped sealing ring. The sealing surface of the valve plate and the valve seat is an oblique cone structure. The surface of the oblique cone of the valve plate is welded with a temperature-resistant and corrosion-resistant alloy material; the spring fixed between the pressure plate of the adjustment ring and the adjustment bolt of the pressure plate are assembled together.
This structure effectively compensates the tolerance zone between the shaft sleeve and the valve body and the elastic deformation of the valve stem under medium pressure, and solves the sealing problem of the valve in the process of bidirectional interchangeable medium transportation. The use of soft T-shaped multi-layer stainless steel sheets on both sides to form a sealing ring has the dual advantages of metal hard seal and soft seal. It has zero leakage sealing performance at low and high temperatures.
The test proves that when the pool is in the positive flow state (the medium flow direction is the same as the disc rotation direction), the pressure on the sealing surface is generated by the torque of the transmission device and the effect of the medium pressure on the valve plate. When the positive medium pressure increases, the tighter the surface of the valve plate oblique cone and the valve seat sealing surface are pressed, the better the sealing effect. In the reverse flow state, the seal between the valve plate and the valve seat is pressed against the valve seat by the torque of the driving device. As the pressure of the reverse medium increases, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the deformation energy stored by the spring of the adjusting ring after being loaded compensates the tight pressure of the sealing surface of the valve plate and the valve seat Play the role of automatic compensation. Therefore, unlike the prior art, the utility model does not install soft and hard multi-layer sealing rings on the valve plate, but directly installs on the valve body. It is an ideal two-way hard sealing method to add an adjustment ring between the pressure plate and the valve seat. . It will replace gate valves, globe valves and ball valves.

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

How to choose the right butterfly valve (1)

July 13, 2020

When the butterfly valve is fully open to fully closed, it turns usually less than 90°. The butterfly valve and the butterfly stem itself have no self-locking capability. For the

U-type-flange-butterfly-valve-2

positioning of the butterfly plate, a worm gear reducer must be installed on the valve rod. The use of worm gear reducer can not only make the butterfly plate self-locking, stop the butterfly plate at any position, but also improve the valve performance. The characteristics of industrial special butterfly valve: can withstand high temperature, the applicable pressure range is also high, the nominal diameter of the valve is large, the valve body is made of carbon steel, and the sealing ring of the valve plate uses a metal ring instead of a rubber ring. Large high-temperature butterfly valves are manufactured by welding steel plates, and are mainly used for flue gas ducts and gas pipes of high-temperature media.

Selection:
The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. The butterfly valve is simple in structure, small in size and light in weight. It is composed of only a few parts, and can be quickly opened and closed only by rotating 90°. The operation is simple, and the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the resistance when the medium flows through the valve body. Therefore, the pressure drop generated by the valve is very small, so it has good flow control characteristics.

If the butterfly valve is required to be used as a flow control, the main thing is to choose the valve size and type correctly. The structural principle of the butterfly

wafer-type-butterfly-valve-with-handle-13

valve is especially suitable for making large-diameter valves. Commonly used butterfly valves are wafer-type butterfly valves and flanged butterfly valves. Wafer type butterfly valve is to use double-headed bolt to connect the valve between two pipeline flanges. Flange type butterfly valve is to use the process of connecting the flange of the valve to the pipeline flange with bolts.

The butterfly valve has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower, etc. as a component used to realize the on-off and flow control of the pipeline system. In the well-known butterfly valve technology, the sealing form mostly adopts a sealing structure, and the sealing material is rubber, polytetrafluoroethylene and the like. Due to the limitation of structural characteristics, it is not suitable for industries such as high temperature, high pressure, corrosion resistance and wear resistance.

An existing more advanced butterfly valve is a three-eccentric metal hard-sealed butterfly valve. The valve body and valve seat are connected components. The sealing surface layer of the valve seat is welded with temperature-resistant and corrosion-resistant alloy materials. The multi-layer soft stack type sealing ring is fixed on the valve plate. Compared with the traditional butterfly valve, this butterfly valve has high temperature resistance, is easy to operate, and has no friction when opening and closing. When closing, the torque is compensated with the increase of the torque of the transmission mechanism, which improves the butterfly valve. The sealing performance and the advantages of extended service life.

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

The main classification methods of butterfly valve (1)

July 10, 2020

There are several classification methods of butterfly valves.

According to the driving method
(1) Electric butterfly valve

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

(2) Pneumatic butterfly valve
(3) Hydraulic butterfly valve
(4) Manual butterfly valve
According to the structure:
(1) Center sealed butterfly valve
(2) Single eccentric sealed butterfly valve
(3) Double eccentric seal butterfly valve
(4) Triple eccentric seal butterfly valve

Sealing surface material:
(1) Soft seal butterfly valve.
1) The sealing pair is composed of non-metallic soft materials versus non-metallic soft materials.
2) The sealing pair is composed of metal hard material to non-metal soft material.
(2) Metal hard seal butterfly valve. The sealing pair is composed of metal hard material to metal hard material.
According to the sealing form:
(1) Forced sealing of butterfly valve.
1) Elastic sealing butterfly valve: The sealing specific pressure is caused by the valve plate squeezing the valve seat when the valve is closed, resulting in the elasticity of the valve seat or valve plate.
2) Impressed torque sealing butterfly valve: The sealing specific pressure is generated by the torque applied to the valve shaft.
(2) Pressure-filled sealing butterfly valve: The sealing specific pressure is generated by the pressure-filling of the elastic sealing element of the valve seat or valve plate.
(3) Automatic sealing butterfly valve: The sealing specific pressure is automatically generated by the medium pressure.

According to working pressure:
(1) Vacuum butterfly valve. Butterfly valve with working pressure lower than standard stack atmospheric pressure.
(2) Low-pressure butterfly valve. Butterfly valve with nominal pressure PN<1.6MPa.
(3) Medium pressure butterfly valve. Butterfly valve with a nominal pressure PN of 2.5-6.4 MPa.
(4) High-pressure butterfly valve. Butterfly valve with a nominal pressure PN of 10.0-80. 0MPa.
(5) Ultra-high pressure butterfly valve. Butterfly valve with nominal pressure PN>100MPa.

According to working temperature:
(1) High temperature. Butterfly valve with t>450 °C.
(2) Medium temperature butterfly valve. Butterfly valve with 120 C<t<450 ℃.
(3) Normal temperature butterfly valve. A butterfly valve at 40C<t<120 °C.
(4) Low temperature butterfly valve. A 100<t<- 40 °C butterfly valve.
(5) Ultra-low temperature butterfly valve. Butterfly valve with t<-100 °C.

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

Structure and characteristics of butterfly valve

July 9, 2020

Butterfly valve is mainly composed of valve body, valve stem, butterfly plate and sealing ring. The valve body is cylindrical, with a short axial length and a built-in butterfly plate.

Double flange butterfly valve (16)

Features of butterfly valve:
1. The butterfly valve has the characteristics of simple structure, small size, light weight, low material consumption, small installation size, rapid switching, 90° reciprocating rotation, and small driving torque. It is used to cut off, connect, and adjust the medium in the pipeline. Has good fluid control characteristics and closed sealing performance.

2. The butterfly valve can transport mud and has the least liquid accumulation at the pipe mouth. At low pressure, a good sealing effect can be achieved. Good adjustment performance.

3. The streamlined design of the butterfly plate makes the fluid resistance loss small, which can be described as an energy-saving product.

4. The valve stem is a through-rod structure. After quenching and tempering, it has good comprehensive mechanical properties, corrosion resistance and scratch resistance. When the butterfly valve is opened and closed, the valve stem only rotates and does not move up and down. The filler of the valve stem is not easy to damage and the seal is reliable. It is fixed with the taper pin of the butterfly plate, and the outgoing end is designed to prevent the outgoing type, so as to prevent the valve rod from collapsing when the connection between the valve rod and the butterfly plate is accidentally broken.

5. Connection methods include flange connection, wafer connection, butt welding connection and lug wafer connection. The driving form includes manual, worm gear transmission, electric, pneumatic, hydraulic, electro-hydraulic linkage and other actuators, which can realize remote control and automatic operation.

You can check the types and structures of butterfly valve on this page: Butterfly 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

Butterfly valve and its Development history – (2)

July 8, 2020

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

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 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

Butterfly valve and its Development history – (1)

July 7, 2020

Butterfly valve, also known as flap valve, is a kind of simple structure regulating valve, which can be used for the on-off control of low-pressure pipeline medium; is a kind of valve that the closing part (flap or disc) is a round plate, which rotates around the valve axis to achieve opening and closing.

The valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media.

U-type-flange-butterfly-valve-2

Mainly cut off and throttle the pipe. The opening and closing part of butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the purpose of opening, closing or adjusting.

The butterfly valve was invented in the United States in the 1930s and introduced to Japan in the 1950s. It was only widely adopted in Japan in the 1960s, but its promotion in my country was after the 1970s. The main characteristics of butterfly valves are: small operating torque, small installation space and light weight. Taking DN1000 as an example, the butterfly valve is about 2T, while the gate valve is about 3.5T, and the butterfly valve is easy to be combined with various driving devices, and has good durability and reliability. The disadvantage of the rubber seal butterfly valve is that when it is used for throttling, improper use will cause cavitation, which will cause the rubber seat to peel off and damage. Therefore, how to choose it correctly depends on the working conditions.

The relationship between the opening of the butterfly valve and the flow rate basically changes linearly. If it is used to control the flow, its flow characteristics are also closely related to the flow resistance of the piping. For example, the diameter and form of the valves installed in the two pipelines are the same, and the pipeline loss coefficients are different, and the flow rate of the valve

Double flange butterfly valve (16)

will also be very different. If the valve is in a large throttle range, the back of the valve plate is prone to cavitation, which may damage the valve. Generally, it is used

outside 15°. When the butterfly valve is in the middle opening, the opening shape formed by the valve body and the front end of the butterfly plate is centered on the valve shaft, and the two sides are formed in different states. The front end of the butterfly plate on one side moves in the direction of the water flow, and the other side counters the direction of the water flow. Therefore, the valve body and the valve plate on one side form a nozzle-shaped opening, and the other side resembles an orifice-shaped opening. The flow rate on the nozzle side is much faster than the throttle side, and negative pressure will occur below the throttle side valve, often The rubber seal will come off. The operating torque of a butterfly valve has different values depending on the degree of opening and the direction of valve opening and closing. Horizontal butterfly valves, especially large-diameter valves, due to water depth, the torque generated by the difference between the valve shaft and the water head can not be ignored. In addition, when the elbow on the inlet side of the valve forms a bias flow, the torque will increase. When the valve is in the middle opening, the operating mechanism needs to be self-locking due to the water flow torque.

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

Structural characteristics of butterfly valve

May 24, 2012

The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the valve body of the butterfly valve, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it is rotated to 90°, the valve is fully opened.

The butterfly valve has a simple structure, small volume and light weight, and is composed of only a few parts. And only need to rotate 90 ° to quickly open and

U-type-flange-butterfly-valve-2

close, simple operation, and the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the single resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has good flow control characteristics. There are two types of butterfly valve: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be embedded on the valve body or attached to the periphery of the butterfly plate.

Valves with metal seals generally have a longer life-time than valves with elastic seals, but it is difficult to achieve complete sealing. Metal seals can adapt to higher operating temperatures, while elastic seals have the disadvantage of being limited by temperature.

If the butterfly valve is required to be used as a flow control, the main thing is to choose the valve size and type correctly. The structure principle of the butterfly valve is especially suitable for making large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems of thermal power stations.

Commonly used butterfly valves are wafer-type butterfly valves and flanged butterfly valves. Wafer type butterfly valve is to connect the valve between the two pipeline flanges with double-headed bolts. Flange type butterfly valve is to have a flange on the valve, and use bolts to connect the two ends of the valve to the pipeline flange. There are four types of butterfly valves in Tanghai Valve company, see below:

Butterfly Valve

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.

Posts

Common failures of butterfly valves and the characteristics of installation

Applicable occasions of butterfly valve

How to choose the right butterfly valve (2)

How to choose the right butterfly valve (1)

The main classification methods of butterfly valve (1)

Structure and characteristics of butterfly valve

Butterfly valve and its Development history – (2)

Butterfly valve and its Development history – (1)

Structural characteristics of butterfly valve

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