Wafer check valve is also called counterflow valve, check valve, back pressure valve, and one-way valve. This type of valve automatically opens and closes by the force generated by the flow of the medium in the pipeline. It is an automatic valve. The wafer check valve is a one-way valve that is currently widely used in various industries. Its main function is to prevent the reverse flow of the medium. Wafer check valves can be divided into single disc and double disc check valves. The single-disc and double-disc types of wafer check valves are mainly divided according to the valve diameter. The purpose is to prevent the medium from stopping the flow or backflow and weakening the hydraulic impact.
The single disc wafer check valve has a compact structure and low manufacturing cost. The structural length is only one-thirtieth to one-tenth of the traditional flange-type check valve. It adopts an integral built-in structure and has no external leakage points. Its flow channel The area is 3% to 10% larger than the conventional wafer check valve, the pressure loss is smaller, and the valve disc closes quickly. There are still many areas of use.
The butterfly plate of the double disc wafer check valve is two semicircles, and is forced to return by a spring. The sealing surface can be made of wear-resistant material overlayed on the body or lined with rubber, and the sealing is reliable. The wafer-type double-disc check valve has a wide range of applications and can be used in pure pipelines and industrial, environmental protection, water treatment, high-rise building water supply and drainage pipelines, etc. Its main function is to prevent the reverse flow of the medium.
In terms of selection, specific needs must be analyzed in detail. Below TWT,China will introduce it to buyers.
Single disc wafer butterfly valve
Single disc wafer check valve is a disc-type ultra-thin check valve. The valve disc is equipped with an O-ring, which has good sealing performance and spring-assisted closing. It is sensitive in action, especially for places with limited installation space. Z is applicable. It has the advantages of simple structure, beautiful appearance, light weight and easy installation. It is mainly suitable for water supply systems, petroleum, chemical industry, metallurgy and other industrial sectors, and is most suitable for places with limited installation space.
Features of single disc wafer butterfly valve:
- The structure is short in length, small in size and light in weight, which brings great convenience to the installation, transportation and storage of pipelines for valves, and can save a lot of materials and reduce costs.
- Thesingle disc wafer check valve has an integral structure, which is simple and compact. It has small impact force when closing the valve, small water hammer pressure, long valve life and high reliability.
- It can be installed horizontally or vertically. It is light in weight and does not need to set a support for the valve.
- The flow channel is smooth, the fluid resistance is small, and the valve disc can be opened safely under a small pressure difference.
Double disc wafer butterfly valve
Double disc wafer check valve is composed of valve body, valve disc, valve stem, spring and other parts, and adopts wafer-type connection. Because the valve disc has a short stroke and is spring-loaded, water hammer can be significantly reduced. This valve is mainly suitable for water supply and drainage pipes in cities, industries and high-rise buildings. Since its structural length is shorter than ordinary check valves, it is more suitable for places with limited installation space.
The double disc wafer check valve is used for pure pipelines and industrial, environmental protection, water treatment, and high-rise building water supply and drainage system pipelines to prevent the reverse flow of media. The double disc wafer check valve adopts a wafer type and has two discs. It is semi-circular and uses a spring to force reset. The sealing surface can be made of wear-resistant material surfacing on the body or lined with rubber, cemented carbide and other seals. It has a wide range of uses and reliable sealing.
There are some other aspects to consider when selecting between single disc wafer check valve and double disc wafer check valve.You are always welcomed to consult TWT,a leading valve supplier from China.Here is an example.
Common material of double disc wafer butterfly valve
- Brass: Brass check valves are a common choice because of their good corrosion resistance and mechanical properties. It is suitable for general water and gas fluid applications, but may be less suitable in acidic media.
- Stainless steel: Stainless steel is a high-strength, corrosion-resistant material suitable for a variety of media, such as water, gas and chemical liquids. Stainless steel check valves can withstand high temperature and high pressure environments and are therefore widely used in industrial fields.
- Cast iron: Cast iron check valves have high strength and corrosion resistance and are suitable for piping systems with liquid and gaseous fluids. It can withstand high pressure and high temperature environments, making it a reliable choice.
- PVC: Polyvinyl chloride (PVC) is a common plastic material with good corrosion resistance and low cost. PVC check valves are suitable for applications such as water treatment, wastewater treatment and chemical delivery.
- Bronze: Bronze check valve is an alloy material composed of copper and tin. It has good corrosion resistance and thermal conductivity and is suitable for applications with water and oil media.