soft sealing butterfly valve Archives

Resilient seated /soft-seal butterfly valve prices

October 22, 2021

The purchase price of soft-sealed butterfly valves is a problem that many customers are concerned about when inquiring, but because the valve is not like furniture and other items in the structure and material is relatively

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

simple, there are more components of the valve, and according to the material used in different working conditions, The components are different, which makes it difficult to give a fixed quotation for the soft-sealed butterfly valve, which should be based on the actual situation. How much it costs to purchase a soft sealing butterfly valve has a lot to do with the material of the valve plate, the material of the valve body, the material of the sealing ring, manual or automatic, etc. Let’s take a look at the specific factors that affect the purchase price of soft-sealed butterfly valves?
1. Material of valve plate. The material of the valve plate of the soft sealing butterfly valve is nylon plate, galvanized plate, 304 plate, 316 plate, etc. The selection of the valve plate is determined according to the medium to be taken by the customer’s pipeline. The general medium mainly relates to whether it is corrosive. If it is not corrosive, you can choose galvanized sheet, and if it is corrosive, you can choose stainless steel 304 plate or 316 plate. Cold-rolled stainless steel costs more than 10,000 yuan per ton, while galvanized steel is several thousand yuan per ton, so obviously the price will be different for different materials.
2. Material of sealing ring. The sealing ring of soft sealing butterfly valve is generally rubber or fluoroplastic. The rubber sealing ring includes nitrile rubber, EPDM rubber, and tetrafluoro rubber. Several rubbers have their own advantages. Nitrile rubber is oil-resistant, and EPDM rubber is resistant to aging. PTFE rubber is resistant to weak corrosion. The temperature resistance of nitrile rubber and EPDM rubber is about 80 degrees, and the temperature resistance of tetrafluoro rubber is about 150 degrees. So we still have to choose according to the temperature and characteristics of the medium. If the temperature is around 80 degrees, you can choose nitrile rubber or EPDM rubber. If the temperature exceeds 80 degrees, you can choose tetrafluoro rubber. Fluoroplastics can also be used when the medium is corrosive but not high temperature. The price of fluoroplastics will be much more economical than rubber.
3. Manual or automatic. The soft sealing butterfly valve is divided into manual and automatic. Manual is the handle butterfly valve, turbine butterfly valve, the driving method is mainly manual. However, electric butterfly valves and pneumatic butterfly valves do not need to be operated manually but are opened and closed automatically by the device. Of course, the price is relatively higher than that of manual ones.
In addition to the above, the size of the valve’s caliber, the size of the applicable pressure, whether it is a flange connection or a wafer connection or an electric welding connection, these factors will all affect the purchase price of the soft sealing butterfly valve. So if you want to know the purchase price of the soft sealing butterfly valve you need, the easiest and best way is to quickly contact our Tanghai staff to give you a professional quotation. According to the working conditions, pressure and medium conditions you provide, Tanghai Professional Services will recommend the most suitable valve types for you and quickly give you an accurate quotation. You are 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

What are the characteristics of the soft sealing butterfly valve

September 18, 2021

Risilient seated /Soft sealing butterfly valve is one of the common butterfly valve types. It is a valve with simple structure and easy operation. It is mainly composed of valve body, valve stem, butterfly plate and sealing ring. The inside of the valve body is a cylindrical shape with a built-in butterfly plate. There are usually two ways to form the seal of a soft-seal butterfly valve. One is that the sealing pair is composed of a non-metallic soft material to a non-metallic soft material. Another is that the sealing pair is composed of a metal hard material to a non-metal soft

wafer type butterfly valve, EPDM seat (10)

material.
The most commonly used materials for the seat ring and seat of soft-sealed butterfly valves are EPDM, nitrile rubber, and polytetrafluoroethylene plastic. The soft-sealed butterfly valve with EPDM rubber seat material usually works in a working environment with a pressure less than 2.5Mpa and a temperature of -50~80℃. Applicable media include salts, acids, metal coating solutions, and water. , Wet chlorine, etc. The soft-sealed butterfly valve with nitrile rubber as the seat material usually works in a working environment with a pressure less than 2.5Mpa and a temperature of -10~90℃. The applicable media include water, oil, waste liquid, etc. The soft-sealed butterfly valve with polytetrafluoroethylene as the seat material can be used in an environment where the pressure is less than or equal to 1.6Mpa and the temperature is -196~200℃. The applicable media include heat resistance, cold resistance, general chemicals and solvents, and most of the liquid.
The advantage of the soft sealing butterfly valve is that it has good sealing performance and can achieve zero leakage. The disadvantage is that it is not resistant to high temperature and high pressure, and the sealing surface is easily eroded by the flowing medium, and the service life is short. The characteristics of the soft sealing butterfly valve are as follows:
1. The valve body is small and light, easy to install, disassemble and repair, and can be installed at any position in the pipeline.
2. The whole valve has a simple structure and is very compact, with small operating torque, and can be opened and closed by rotating 90 degrees.
3. It has good flow regulation performance.
4. The seal can be replaced, the sealing performance is good, and the two-way sealing can be achieved.
5. The butterfly plate can be sprayed with a coating layer, such as nylon rubber or polytetrafluoroethylene, according to the needs of users.
6. Flange connection and wafer connection can be designed according to requirements.
7. According to the requirements of the working conditions, the soft-sealed butterfly valve can be driven manually, electrically or pneumatically.

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

Detailed introduction of soft sealing butterfly valve-(3)

July 28, 2020

Features of soft sealing butterfly valve:

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

1. Small and light, easy to disassemble and repair, and can be installed in any position.

2. The structure is simple and compact, the operating torque is small, and the 90-degree rotation opens quickly.

3. The flow characteristics tend to be straight, and the regulation performance is good.

4. The connection between the butterfly plate and the valve stem adopts a pinless structure, which overcomes possible internal leakage points.

5. The seal can be replaced, and the seal is reliable to achieve two-way sealing.

6. The butterfly plate can be sprayed with a coating layer, such as nylon or PTFE, according to user requirements.

7. The valve can be designed as flange connection and wafer connection.

8. The driving mode can be manual, electric or pneumatic.

Problems in the use of soft sealing butterfly valves:

1. Due to the principle of the triple eccentric structure, the sealing between the sealing surface of the valve plate and the valve seat is to press the valve plate against the valve seat by the torque of the transmission device. In the state of positive flow, the higher the medium pressure, the tighter the sealing extrusion. When the flow channel medium flows back, as the medium pressure increases, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the seal begins to leak.

2. Due to structural conditions, this structure is not suitable for valves with a diameter below DN200, because the overall structure of the valve plate is too thick and the flow resistance is large.

3. Since the multilayer soft and hard stacked sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium will wash its sealing surface positively, and the soft sealing tape in the metal sheet sandwich will directly affect the sealing performance after being washed.

high-performance soft sealing butterfly valve, characterized in that: the valve seat sealing ring is composed of multiple layers of stainless steel sheets on both sides of the soft T-shaped sealing ring.

The sealing surface of the valve plate and the valve seat is of an oblique cone structure, and the oblique cone surface of the valve plate is welded with temperature-resistant and corrosion-resistant alloy materials; the spring fixed between the adjusting ring pressure plate and the adjusting bolt of the pressure plate are assembled together. This structure effectively compensates for the tolerance zone between the shaft sleeve and the valve body and the elastic deformation of the valve stem under the medium pressure, and solves the sealing problem of the valve in the two-way interchangeable medium conveying process.

The sealing ring is composed of a soft T-shaped multi-layer stainless steel sheet on both sides, which has the dual advantages of metal hard and soft sealing. It has zero leakage sealing performance regardless of low temperature and high temperature. The test proves that in the positive flow state of the pool (the flow direction of the medium is the same as the rotation direction of the butterfly plate), the pressure of the sealing surface is produced by the torque of the transmission device and the action of the medium pressure on the valve plate. When the positive medium pressure increases, the tighter the oblique cone surface of the valve plate and the sealing surface of the valve seat are pressed, the better the sealing effect.

Therefore, unlike the prior art, the utility model does not install a soft and hard multilayer sealing ring on the valve plate, but directly installs it on the valve body. Adding an adjustment ring between the pressure plate and the valve seat is a very ideal two-way hard sealing method. . It can replace gate valves and ball valves.

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. With the increase of the reverse medium pressure, when 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 for the tight pressure of the sealing surface of the valve plate and the valve seat Play the role of automatic compensation.

Detailed introduction of soft sealing butterfly valve-(2)

July 28, 2020

There are many types of soft-sealed butterfly valves, which can be divided into the following categories according to different forms:
Classified by structure
Classified by structure

(1) Center sealing butterfly valve

(2) Single eccentric sealed coal valve

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

(3) Double eccentric sealing butterfly valve

(4) Triple eccentric seal valve

Classified according to the sealing surface material:

(1) Soft sealing butterfly valve.

1) The sealing pair is composed of non-metallic soft material to non-metallic soft material.

2) The sealing pair is composed of a metal hard material and a non-metal soft material.

(2) Metal hard seal butterfly valve. The sealing pair is composed of a metal hard material to a metal hard material.

Classified according to the sealing form:

(1) Forced sealing butterfly valve

1) Elastic sealing butterfly valve. The specific pressure of the seal is generated by the valve plate squeezing the valve seat when the valve is closed, and the elasticity of the valve seat or valve plate

2) External torque sealing butterfly valve. The seal specific pressure is generated by the torque applied to the valve shaft

(2) Pressurized sealing butterfly valve. The specific sealing pressure is generated by the pressure of the elastic sealing element on the valve seat or valve plate

(3) Automatic sealing butterfly valve. The sealing specific pressure is automatically generated by the medium pressure.

Classified by work pressure:

(1) Vacuum butterfly valve. Butterfly valves whose working pressure is lower than the atmospheric pressure of the standard reactor.

(2) Low pressure butterfly valve. Butterfly valve with nominal pressure PN<1.6MPa.

(3) Medium pressure butterfly valve. Butterfly valve with nominal pressure PN of 2.5-6. 4MPa.

(4) High pressure butterfly valve. A 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.

Classified by working temperature:

(1) High temperature butterfly valve. t>450 C butterfly valve

(2) Medium temperature butterfly valve. 120 C＜t＜450 C butterfly valve

(3) Normal temperature butterfly valve. One 40C<t<; 120 C butterfly valve

(4) Cryogenic butterfly valve. One 100＜t＜一40 C butterfly valve

(E) Ultra-low temperature butterfly valve. t＜一100 C butterfly valve

Classified according to the connection method:

(1) Wafer butterfly valve

(2) flange butterfly valve

(3) lug butterfly valve

(4) Welded butterfly valve

Detailed introduction of soft sealing butterfly valve-(1)

July 28, 2020

The butterfly plate of the soft sealing butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the

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

disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When the rotation reaches 90°, the valve is fully opened. The characteristics of the new type of high-life stainless steel butterfly valve and the problem of the butterfly valve during use, this type of valve should generally be installed horizontally in the pipeline.

Problems in use of soft sealing butterfly valve:
1. Since the multi-layer soft and hard stacked sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium will wash its sealing surface positively, and the soft sealing tape in the metal sheet sandwich will directly affect the sealing performance after being washed.

2. Due to structural conditions, this structure is not suitable for valves with a diameter below DN200, because the overall structure of the valve plate is too thick and the flow resistance is large.

3. Due to the principle of the triple eccentric structure, the seal between the sealing surface of the valve plate and the valve seat depends on the torque of the transmission device to press the valve plate against the valve seat. In the state of positive flow, the higher the medium pressure, the tighter the sealing extrusion. When the flow channel medium flows back, as the medium pressure increases, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the seal begins to leak.

high-performance soft sealing butterfly valve, characterized in that: the valve seat sealing ring is composed of multiple layers of stainless steel sheets on both sides of the soft T-shaped sealing ring.

The sealing surface of the valve plate and the valve seat is of oblique cone structure, and the temperature and corrosion resistant alloy material is built up on the oblique cone surface of the valve plate; the spring fixed between the pressure plate of the adjusting ring and the adjusting bolt of the pressure plate are assembled together. This structure effectively compensates for the tolerance zone between the shaft sleeve and the valve body and the elastic deformation of the valve stem under the medium pressure, and solves the sealing problem of the valve in the two-way interchangeable medium conveying process.

The sealing ring is composed of a soft T-shaped multi-layer stainless steel sheet on both sides, which has the dual advantages of metal hard and soft sealing. It has zero leakage sealing performance regardless of low temperature and high temperature. The test proves that in the positive flow state of the pool (the flow direction of the medium is the same as the rotation direction of the butterfly plate), the pressure of the sealing surface is produced by the torque of the transmission device and the action of the medium pressure on the valve plate. When the positive medium pressure increases, the tighter the oblique cone surface of the valve plate and the sealing surface of the valve seat 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. With the increase of the reverse medium pressure, when 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 for 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 a soft and hard multilayer sealing ring on the valve plate, but directly installs it on the valve body. Adding an adjustment ring between the pressure plate and the valve seat is a very ideal two-way hard sealing method. . It can replace gate valves and globe valves

Posts

Resilient seated /soft-seal butterfly valve prices

What are the characteristics of the soft sealing butterfly valve

Detailed introduction of soft sealing butterfly valve-(3)

Detailed introduction of soft sealing butterfly valve-(2)

Detailed introduction of soft sealing butterfly valve-(1)

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