manufacturer Archives

The Application of Concentric Type Butterfly Valve in Petroleum(oil and gas) Industry

June 25, 2024

Concentric type butterfly valves play vital roles across various sectors within the petroleum (oil and gas) industry due to their reliability, versatility, and cost-effectiveness. Here are the main applications of concentric type butterfly valves in the petroleum industry:

Flow Control in Pipeline Systems:

Crude Oil Pipelines: Regulating the flow of crude oil within pipelines during transportation from production fields to refineries or terminals.

Natural Gas Pipelines: Controlling the flow of natural gas in transmission and distribution pipelines.

Refined Product Pipelines: Managing the flow of refined petroleum products like gasoline, diesel, and jet fuel.

Wellhead and Production Systems:

Flow Control: Regulating the flow of crude oil, natural gas, or water at wellheads and production facilities.

Water Injection Systems: Controlling the injection of water for secondary or tertiary oil recovery methods.

Refining Processes:

Cooling Systems: Regulating the flow of cooling water for heat exchangers and condensers.

Process Fluids: Controlling the flow of various process fluids during refining operations.

Chemical Injection Systems: Regulating the flow of chemicals for process treatment and corrosion inhibition.

Storage Terminal Operations:

Tank Farm Operations: Handling the flow of crude oil, refined products, and

chemicals within storage tank farms.

Loading and Unloading: Controlling the flow of petroleum products during loading onto tankers and unloading from ships or trucks.

Offshore Platforms and Floating Production Systems:

Seawater Systems: Regulating seawater flow for cooling, firewater, and other offshore operations.

Ballast Systems: Controlling ballast water for stability adjustment on offshore platforms.

Firewater Systems: Emergency firefighting systems on offshore platforms.

Petrochemical Plants:

Feedstock Handling: Controlling the flow of feedstocks such as ethylene, propylene, and other petrochemical products.

Process Fluids: Regulating the flow of various chemicals and fluids during production processes.

Key Advantages in the Petroleum Industry:

Corrosion Resistance: Materials selected are often resistant to corrosion from petroleum products and chemicals.

Space Efficiency: Compact design is suitable for installations where space is limited, such as offshore platforms.

Quick Operation: Rapid open/close operation for emergency shutdown situations.

Reliable Sealing: Provides tight shut-off to prevent leaks, crucial for safety and environmental protection.

Cost-Effective Solution: Butterfly valves offer cost savings compared to other valve types.

Concentric type butterfly valves are indispensable components in the petroleum industry, serving critical functions in transportation, production, refining, storage, and distribution of oil and gas products. Their versatility, reliability, and cost-effectiveness make them widely used in various applications throughout the industry. Proper selection, installation, and maintenance of these valves are essential to ensure safe and efficient operations in the petroleum sector.

Tianjin Tanghai Valve Co., Ltd. is a professional marine valve manufacturer, including butterfly valve, check valve, gate /Knife gate valve. We have certificates: CE, ISO, BV, DNV foundry and products approval. 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. Below is our wafer butterfly valve of marine valves,if you need to check more information, please click here: https://www.tanghaivalve.com/wafer-type-butterfly-valve-th-btv-aw/，

Please contact us if you need more support, please contact us freely: info@tanghaivalve.com.We are committed to “Build a top valve enterprise; Be a reliable partner!”Friends from all over the world are welcome to visit us for evaluation, guidance, and orders!

Marine valves in the shipbuilding industry（tanghai Valve)

June 7, 2024

Marine valves play a crucial role in shipbuilding, managing the flow of various fluids such as water, fuel, oil, and gases throughout a vessel. These valves are essential for the operational efficiency, safety, and maintenance of a ship. Here are some common types of marine valves used in shipbuilding and their functions:

Gate Valves

Function: Used for on/off control of fluids.

Application: Often used in systems where the valve remains either fully open or fully closed, such as in ballast and bilge systems.

Globe Valves

Function: Used for regulating flow and pressure.

Application: Typically found in cooling water, fuel oil, and lubricating oil systems where flow needs to be controlled.

Ball Valves

Function: Provide tight shut-off and control flow.

Application: Commonly used in low-pressure systems like potable water and compressed air.

Butterfly Valves

Function: Regulate or isolate flow with a rotating disc.

Application: Used in large diameter pipes, such as those in ballast systems, due to their compact design and lightweight.

Check Valves

Function: Prevent backflow.

Application: Installed in bilge lines, ballast systems, and various other systems to ensure one-way flow of fluids.

Safety Relief Valves

Function: Protect systems from overpressure.

Application: Essential in steam systems, hydraulic systems, and any pressurized tanks to release excess pressure.

Control Valves

Function: Regulate flow, pressure, temperature, and level.

Application: Used in automated systems for precise control, often integrated with sensors and actuators.

Diaphragm Valves

Function: Control flow with a flexible diaphragm.

Application: Suitable for corrosive or abrasive fluids, often found in sanitary or chemical systems.

Materials Used

Marine valves must withstand harsh marine environments, including exposure to saltwater, chemicals, and varying temperatures. Common materials include:

Bronze: Excellent corrosion resistance, commonly used for smaller valves.

Brass: Good corrosion resistance and machinability.

Stainless Steel: High strength and corrosion resistance, used in more demanding applications.

Cast Iron: Durable and cost-effective for non-corrosive applications.

Ductile Iron: Offers more strength and flexibility compared to cast iron.

Installation and Maintenance

Installation: Proper installation ensures the longevity and functionality of marine valves. This includes correct orientation, secure mounting, and adherence to manufacturer specifications.

Maintenance: Regular inspections, cleaning, and lubrication are crucial. Valves should be checked for leaks, corrosion, and proper operation. In high-wear applications, routine part replacement might be necessary.

Regulatory Standards

Marine valves must comply with international and national maritime regulations to ensure safety and performance. Key regulatory bodies include:

International Maritime Organization (IMO)

American Bureau of Shipping (ABS)

Lloyd’s Register (LR)

Det Norske Veritas (DNV)

Bureau Veritas (BV)

In summary, marine valves are integral components in shipbuilding, ensuring the safe and efficient operation of various ship systems. Their selection, installation, and maintenance are vital for the vessel’s overall performance and safety.

Tianjin Tanghai Valve Co., Ltd. is a professional marine valve manufacturer, including butterfly valve, check valve, gate /Knife gate valve. We have certificates: CE, ISO, BV, DNV foundry and products approval. 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. Below is our wafer butterfly valve of marine valves,if you need to check more information, please click here:https://www.tanghaivalve.com/wafer-type-butterfly-valve-th-btv-aw/.

Please contact us if you need more support, please contact us freely: info@tanghaivalve.com.

We are committed to “Build a top valve enterprise; Be a reliable partner!”Friends from all over the world are welcome to visit us for evaluation, guidance, and orders!

Wafer Concentric Type Butterfly Valve (tanghai valve)

April 11, 2024

A wafer concentric type butterfly valve is a type of butterfly valve commonly used in various industries, including marine applications. Here’s a brief overview of its features, selection considerations, and usage:

Features:

Concentric Design: The wafer concentric butterfly valve features a concentric design where the stem passes through the center of the disc, ensuring a uniform seal around the circumference. This design minimizes turbulence and pressure drop while providing efficient flow control.
Wafer Style: These valves have a wafer-style body, which means they fit between two flanges without the need for additional bolts or nuts. This compact design saves space and facilitates easy installation and removal.
Resilient Seating: Most wafer concentric butterfly valves come with resilient seat materials such as EPDM or NBR, which provide excellent sealing properties and resistance to wear, corrosion, and chemicals.
Bidirectional Sealing: The concentric design allows for bidirectional sealing, meaning the valve can be installed in either direction without affecting its performance.
Manual or Actuated Operation: Wafer concentric butterfly valves are available in manual or actuated configurations. Manual valves are operated by hand, while actuated valves can be controlled remotely using pneumatic, electric, or hydraulic actuators for automated flow control.

Selection Considerations:

Size and Pressure Rating: Choose a valve size and pressure rating suitable for the intended application and operating conditions. Consider factors such as flow rate, system pressure, and compatibility with existing piping.
Material Construction: Select valve materials compatible with the fluid being handled and the environmental conditions. Common materials include stainless steel, carbon steel, ductile iron, and various alloys.
Seat Material: Consider the type of seat material (e.g., EPDM, NBR, PTFE) based on the fluid properties (e.g., temperature, viscosity, chemical compatibility) and sealing requirements.
Operation Type: Decide whether manual or actuated operation is preferred based on the level of automation required, accessibility, and control system integration.
Standards Compliance: Ensure the selected valve complies with relevant industry standards and certifications for quality, performance, and safety, such as ANSI, API, ISO, and marine classification societies’ requirements.

Usage:

Installation: Properly install the wafer concentric butterfly valve between flanges using appropriate gaskets and fasteners according to manufacturer specifications and industry standards.
Operation: Operate the valve manually or remotely using the designated controls, following established procedures for opening, closing, and adjusting the flow as needed.
Maintenance: Implement a regular maintenance schedule to inspect, clean, lubricate, and replace components as necessary to ensure optimal performance and longevity.
Monitoring: Periodically monitor the valve’s operation and condition for signs of leakage, wear, or malfunction, and take corrective action as required to prevent downtime or safety hazards.
Emergency Response: Establish protocols for responding to valve failures, leaks, or other emergencies, including shutdown procedures, isolation measures, and contingency plans to mitigate risks and minimize disruptions.

By considering these factors and following best practices for selection, installation, and maintenance, wafer concentric butterfly valves can effectively control flow and provide reliable performance in marine applications and other industrial settings.

Lug Concentric Type Butterfly Valve with Rubber Seated（tanghai valve)

March 27, 2024

A lug concentric type butterfly valve with rubber seated refers to a specific configuration of a butterfly valve commonly used in various industries, including marine applications. Let’s break down its features, considerations for selection, and how it’s typically used:

Features:

Concentric Design: Like other concentric butterfly valves, this type features a design where the stem passes through the center of the disc, ensuring a uniform seal around the circumference. This design minimizes turbulence and pressure drop while providing efficient flow control.
Lug Style: The valve body has lugs (also known as ears or tabs) on the valve’s periphery, allowing it to be bolted directly between flanges in the pipeline. This design provides easy installation and removal without needing to disconnect the entire pipeline.
Rubber Seating: The valve has rubber or elastomeric seating, typically made from materials like EPDM or NBR, which provide excellent sealing properties. Rubber seats offer resilience, chemical resistance, and longevity, making them suitable for various fluids and operating conditions.
Bidirectional Sealing: Similar to other concentric butterfly valves, this type can seal bidirectionally, allowing it to be installed in either direction without affecting its performance.
Manual or Actuated Operation: Lug concentric butterfly valves are available in both manual and actuated configurations. Manual valves are operated by hand, while actuated valves can be controlled remotely using pneumatic, electric, or hydraulic actuators for automated flow control.

Selection Considerations:

Size and Pressure Rating: Choose a valve size and pressure rating suitable for the intended application and operating conditions. Consider factors such as flow rate, system pressure, and compatibility with existing piping.
Material Construction: Select valve materials compatible with the fluid being handled and the environmental conditions. Common materials include stainless steel, carbon steel, ductile iron, and various alloys.
Seat Material: Consider the type of seat material (e.g., EPDM, NBR, PTFE) based on the fluid properties (e.g., temperature, viscosity, chemical compatibility) and sealing requirements.
Operation Type: Decide whether manual or actuated operation is preferred based on the level of automation required, accessibility, and control system integration.
Standards Compliance: Ensure the selected valve complies with relevant industry standards and certifications for quality, performance, and safety, such as ANSI, API, ISO, and marine classification societies’ requirements.

Usage:

Installation: Properly install the lug concentric butterfly valve between flanges using appropriate gaskets and fasteners according to manufacturer specifications and industry standards.
Operation: Operate the valve manually or remotely using the designated controls, following established procedures for opening, closing, and adjusting the flow as needed.
Maintenance: Implement a regular maintenance schedule to inspect, clean, lubricate, and replace components as necessary to ensure optimal performance and longevity.
Monitoring: Periodically monitor the valve’s operation and condition for signs of leakage, wear, or malfunction, and take corrective action as required to prevent downtime or safety hazards.
Emergency Response: Establish protocols for responding to valve failures, leaks, or other emergencies, including shutdown procedures, isolation measures, and contingency plans to mitigate risks and minimize disruptions.

By considering these factors and following best practices for selection, installation, and maintenance, lug concentric butterfly valves with rubber seating can effectively control flow and provide reliable performance in marine applications and other industrial settings.

Driving device for Manual Wafer Butterfly Valve

August 31, 2022

The driving device of the manual wafer butterfly valve is mainly the handwheel and the handle. For valves with little torque required for opening and closing, a manual device, handwheel or handle can be used to directly fix the valve stem or valve stem nut. The diameter of the handwheel is based on the relevant standards or the torque required for valve opening and closing. According to the standard, the opening and closing force added to the handwheel or handle cannot exceed 360N, and its shape and size can be in accordance with the provisions of JB/T93-2008. Steel plate, aluminum alloy or plastic pressed handwheels can also be used on manual wafer butterfly valves with smaller nominal size DN. The butterfly valve also has a remote-operated manual device using a universal joint.

JIS 10K-wafer butterfly valve-backup seat (3)

Manual Wafer Butterfly Valve Handle and Turbine Drive
The handle of the manual wafer butterfly valve is mainly used with the gear, while the handwheel needs to be used with the worm drive. When the operating force of the valve exceeds 360N, cylindrical spur gears, bevel gears and worm drive devices are often used to reduce the force required for opening and closing. What’s the difference between a handle and a turbo? The first is that the driving method is different. The turbine butterfly valve mainly drives the rotation of the internal gear through the rotation of the handwheel, so that the valve plate rotates and the valve plate is opened and closed. The handle butterfly valve mainly uses the rotation of the handle to turn the valve plate to open and close. Secondly, the force required to operate the handle is large, so the diameter of the valve used is generally below 250mm. Therefore, the handle of the manual wafer butterfly valve and the turbine drive are also different in nominal diameter.

Operating procedures for the drive device of the manual wafer butterfly valve
1. The operator should be familiar with the structure and working principle of the manual butterfly valve.
2. The opening force of the manual butterfly valve exceeds 15kg. If you feel particularly strenuous, you should eliminate the product failure.
3. When the manual butterfly valve is closed, the handle should be reversed for one or two turns, which is conducive to the reopening of the manual butterfly valve.
4. There will be a sediment accumulation area near the manual butterfly valve that is closed for a long time, and these sediments will form resistance to the opening and closing of the manual butterfly valve.
5. When opening, the opening and closing actions should be repeated to promote the loosening of the sediment.
6. If it is found that there is often sediment deposition near the manual butterfly valve, the manual butterfly valve should be opened and closed frequently to facilitate the removal of sediment.
7. For the manual butterfly valve that does not open and close for a long time, it should also be operated once or twice regularly to prevent rust or silt.
8. Check the shaft end for leakage every six months. If there is leakage, replace the packing in time.

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

Where can butterfly valves be used

August 22, 2022

The butterfly valve is a kind of valve used to control the fluid flow in the pipeline. It uses the disc-shaped butterfly plate as the opening and closing part, and rotates 0~90° reciprocatingly to realize the opening and closing of the butterfly valve. Butterfly valves are used in a wide

Double flange butterfly valve (16)

range of applications. In general, butterfly valves are suitable for various water fluids, including domestic water, fire water, circulating water, sewage, etc. Some powder material media can also use butterfly valves. This article will introduce you where butterfly valves can be used.
Butterfly valve has two obvious characteristics, large diameter and low pressure difference. Compared with other types of valves, under the premise of the same diameter, the butterfly valve is lighter in weight, smaller in volume, and has the simplest structure, and this advantage will become more obvious as the diameter increases. The cost of using butterfly valves is relatively low. The pressure bearing capacity of the butterfly valve is poor. The greater the pressure of the working conditions, the greater the damage to the sealing surface of the butterfly valve, and the technical requirements and manufacturing costs of the butterfly valve will also increase significantly.

Butterfly valves are usually used to control the flow on large-diameter pipelines, and gate valves, globe valves or ball valves are not suitable. Imagine that on a DN1500 pipeline, if a gate valve or globe valve is used, the valve needs to be made very large and takes up a lot of space, while the ball valve is not suitable for large-diameter valves. Although butterfly valves can also be used for flow regulation, in small-diameter pipelines, butterfly valves are rarely used for flow regulation. One is because it is not easy to adjust, and the other is the sealing performance of butterfly valves and globe valves and ball valves. Compared with the poor, the gate valve cannot do flow regulation. Small-diameter butterfly valves are generally used in pipelines that pass through water, such as water supply and drainage, circulating water, fire water, etc. In addition, butterfly valves are often used in places where the requirements for sealing are not particularly high, and the frequency of opening and closing is not particularly frequent.

The above is the introduction of “where the butterfly valve can be used”. The butterfly valve plays a very important role and has become an indispensable control component in our daily production work. If you have purchase requirements for butterfly valve products, you are welcome to inquire 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

Advantages and Disadvantages of Centerline Butterfly Valves

August 16, 2022

Advantages of Centerline Butterfly Valves
The centerline butterfly valve adopts the centerline sealing structure, and the centerline of the disc sealing of the butterfly valve is consistent with the centerline of the valve body and the rotation centerline of the valve stem. The upper and lower ends of the butterfly plate near the

Double flange butterfly valve (16)

valve stem are designed as two smooth planes, and are in close contact with the valve seat gasket made of rubber to ensure that the medium does not leak from both ends; the outer edge of the butterfly plate is designed as a spherical outer edge, It should be ensured that the arc surface has a suitable surface roughness during processing, and the seat gasket should ensure that the sealing surface has a suitable surface roughness during molding. When the valve is closed, the butterfly plate rotates 0-900 degrees, and gradually compresses the valve seat gasket made of rubber, so that the elastic force formed by the elastic deformation of the valve seat gasket is used as the necessary sealing pressure to ensure the sealing of the valve.
The centerline butterfly valve is designed to reduce flow resistance:
1) The channel is designed as a full-diameter structure, which ensures the flow area of the valve and reduces the flow resistance when the fluid passes through the valve.
2) The butterfly plate adopts the disc-shaped streamline design, which can not only ensure the stress intensity in the center of the butterfly plate, but also ensure that the valve can obtain a larger flow coefficient and a smaller fluid resistance coefficient.
3) The valve seat sealing ring is designed as a soft sealing structure of rubber and resin skeleton (fixed sleeve), which is embedded in the valve body after being manufactured. The part of the inner ring higher than the inner cavity of the valve body adopts a streamline design to achieve the purpose of reducing the flow resistance.

Disadvantages of Centerline Butterfly Valves
Because of its own structure, the centerline butterfly valve can only be made into a soft-sealed butterfly valve, so the centerline butterfly valve can only be used in the working environment of low pressure and normal temperature, and is not suitable for high temperature and high pressure conditions.
The above is the introduction of the advantages and disadvantages of the centerline 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

Stem structure and Integral Seat of centerline wafer butterfly valve

July 25, 2022

The centerline wafer butterfly valve can be divided into two types: pinless butterfly valve and pinned butterfly valve. The main difference between them is whether the valve plate and valve stem are fixed with pins. The pinned butterfly valve and the pinless butterfly valve

JIS 10K-wafer butterfly valve-backup seat (1)

correspond to the needs of different working conditions, and more depends on the needs of users. Because the process of the pinless butterfly valve is more effective and more complicated, and there is no pin hole on the surface of the butterfly plate, its price will also be a little more expensive than that of the butterfly valve with a pin. And relatively speaking, it does not appear pitting corrosion and point leakage. Now let’s take a look at the pinless structure of the centerline wafer butterfly valve:

Centerline Wafer Type Butterfly Valve Double Half Shaft Structure
The double half shaft is a kind of structural performance of the midline wafer butterfly valve, also called the square shaft. Corresponding to it is the through shaft. Double semi-shaft means that there is a shaft on the upper and lower sides of the valve plate of the butterfly valve. The upper shaft and the valve stem are integrally formed to act as a transmission, and the lower shaft is a circular shaft, which plays the role of positioning the valve plate. Since the connection between the upper shaft, the valve stem and the valve plate is usually through a square shaft – a square hole, there are also hexagonal connections. Therefore, the processing of the valve plate is usually processed by punching, slotting or EDM, and the processing efficiency is low. In addition, the lower shaft also needs to pass through the through hole at the bottom of the valve body to be installed. After that, a gasket and a retaining ring need to be added to the bottom to fix the lower shaft. The processing and assembly of the valve body also increases the difficulty. Therefore, this structure is only used in large sizes now.

Large and small head shaft structure of centerline wafer butterfly valve
The stem of this midline wafer type butterfly valve is a flat shaft that passes through the valve plate. At the lower end, the diameter is reduced to a size smaller than the flat hole of the valve plate to pass through the valve plate, and the bottom of the valve body is positioned to ensure the valve Concentricity and symmetry of the plate. The processing of the through hole of the valve plate only requires a high degree of coaxiality of the single-side feed. In addition, there is no through hole at the bottom of the valve body, which also avoids external pollution caused by the leakage of the valve body. However, due to the variable diameter of the valve stem and the valve body, the processing cost is appropriately increased, and the upper and lower holes of the valve seat are not of equal diameter, which is easy to cause errors in the assembly process.

Equal Diameter Flat Shaft for Centerline Wafer Type Butterfly Valve
The structure of this midline wafer butterfly valve is evolved from the structure of the large and small head shafts. The valve stem is an equal-diameter shaft. The bottom is processed into double D type and the valve plate forms a close fit to ensure the transmission of the valve plate. It is also a flat hole, but the direction of the flat hole is rotated by a 90°, so as to ensure that when the valve is at the closing point or close to the closing point, the valve stem is in contact with the valve body bushing with a circular surface to ensure the symmetry of the valve plate and the same The axial degree can not only avoid the bending deformation of the valve stem but also make the valve close tightly. Since the valve body and seat are the same size in both directions, the efficiency can be greatly improved during processing and assembly. This kind of structure is simple and practical, and has the characteristics of high processing efficiency, quick assembly, tight coordination, economical saving and so on.

We all know that the seal of the centerline wafer butterfly valve is inseparable from the sealant sleeve, and the integral sealant sleeve is actually a wafer-type butterfly valve with a reliable sealing and leak-proof valve seat. It includes the annular valve body of the upper and lower valve necks, the annular valve seat embedded on the inner wall of the valve body, the butterfly plate, and the valve body which is rotatably installed on the valve body through the valve seat and the butterfly plate through the upper and lower valve necks. The valve stem and the transmission device, the valve seat is composed of an annular skeleton and an integral sealant sleeve formed integrally with it.

The integral sealant sleeve of the midline wafer butterfly valve consists of an inner wall sealant layer covering the inner wall of the skeleton and an end face sealant layer covering the two ends of the skeleton respectively. It is characterized in that the two end-face sealant layers are divided into a circumferential extension edge covering the end face of the annular valve body, and the extension edge of one end-face sealant layer is integrally and fixedly connected with the end-face sealant layer. The fixed epitaxial edge of the end face sealant layer on the other side and the end face sealant layer are detachably connected movable epitaxial edges.

The birth of this midline wafer butterfly valve seat is that the butterfly valve, as a fluid pipeline valve, has very strict requirements on its tightness. However, the current wafer butterfly valve still has the problem of running and dripping, which affects the normal use. Therefore, how to improve the structure of the valve seat has become a concern. However, the integral sealing valve seat, which is reliably sealed against leakage, can completely cover and seal the joint between the valve seat and the annular inner wall of the valve body. Therefore, it can effectively prevent the fluid in the pipeline from entering the valve body, effectively avoid the leakage of the valve caused by engineering construction and other reasons, and ensure the normal operation of the valve. In addition, the structure of the fixed epitaxial edge and the movable epitaxial edge is also convenient to assemble and use. While ensuring the quality of the project, it saves costs and is suitable for market promotion.

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

Stem structure of centerline wafer butterfly valve

July 11, 2022

The centerline wafer butterfly valve can be divided into two types: pinless butterfly valve and pinned butterfly valve. The main difference between them is whether the valve plate and the valve stem are fixed with a pin. The pinned butterfly valve and the pinless butterfly valve

JIS 10K-wafer butterfly valve-backup seat (3)

correspond to the needs of different working conditions, and more depends on the needs of users. Because the process of the pinless butterfly valve is more effective and more complicated, and there is no pin hole on the surface of the butterfly plate, its price is also a little more expensive than that of the butterfly valve with a pin. And relatively speaking, it does not appear pitting corrosion and point leakage. Now let’s take a look at the pinless structure of the centerline wafer butterfly valve:

Centerline Wafer Type Butterfly Valve Double Half Shaft Structure
The double half shaft is a kind of structural performance of the midline wafer butterfly valve, also called the square shaft. Corresponding to it is the through shaft. Double semi-shaft means that there is a shaft on the upper and lower sides of the valve plate of the butterfly valve. The upper shaft and the valve stem are integrally formed to act as a transmission, and the lower shaft is a circular shaft, which plays the role of positioning the valve plate. Since the connection between the upper shaft, the valve stem and the valve plate is usually through a square shaft – a square hole, there are also hexagonal connections. Therefore, the processing of the valve plate is usually processed by punching, slotting or EDM, and the processing efficiency is low. In addition, the lower shaft also needs to pass through the through hole at the bottom of the valve body to be installed. After that, it is necessary to add a gasket and a retaining ring to the bottom to fix the lower shaft. The processing and assembly of the valve body also increases the difficulty. Therefore, this structure is only used in large sizes now.

Large and small head shaft structure of centerline wafer butterfly valve
The stem of this midline wafer butterfly valve is a flat shaft that passes through the valve plate. The diameter at the lower end is reduced to a size smaller than the flat hole of the valve plate to pass through the valve plate, and the bottom of the valve body is used for positioning to ensure the valve Concentricity and symmetry of the plate. The processing of the through hole of the valve plate only requires a high degree of coaxiality of the single-side feed. In addition, there is no through hole at the bottom of the valve body, which also avoids external pollution caused by the leakage of the valve body. However, due to the variable diameter of the valve stem and the valve body, the processing cost is appropriately increased, and the upper and lower holes of the valve seat are not of equal diameter, which is also prone to errors in the assembly process.

Equal Diameter Flat Shaft for Centerline Wafer Type Butterfly Valve
The structure of this midline wafer butterfly valve is evolved from the structure of the large and small head shafts. The valve stem is an equal-diameter shaft. The bottom is processed into double D type and the valve plate forms a close fit to ensure the transmission of the valve plate. It is also a flat hole, but the direction of the flat hole is rotated by a 90°, so as to ensure that when the valve is at the closing point or close to the closing point, the valve stem is in contact with the valve body bushing with a circular surface to ensure the symmetry of the valve plate and the same The axial degree can not only avoid the bending deformation of the valve stem but also make the valve close tightly. Since the valve body and seat are the same size in both directions, the efficiency can be greatly improved during processing and assembly. This kind of structure is simple and practical, and has the characteristics of high processing efficiency, quick assembly, tight coordination, economical saving and so on.

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

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

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