Check valve refers to a valve whose opening and closing part is a round disc and acts by its own weight and medium pressure to block the backflow of the medium, which belongs to the automatic valve.The motion mode of the valve disc is divided into lifting type and swinging type.Lift Check Valve is similar with globe valve, only the stem that drives the disc is missing.
The check valve is often used as the bottom valve of the pumping device, it prevents the return of water. The check valve is used in combination with the globe valve which can play the role of security isolation. The disadvantage is that the resistance is large and the sealing is poor when closed.
As a general-purpose valve, the check valve has a wide range of applications. This broad market also leads to a diverse variety of check valve types. TEJI, a professional valve manufacturer, presents the following check valves.
The swing check valve is also called non-returen valve. The function is to prevent the fluid in the pipeline back flow. Swing check valve is mainly used for the one-way flow of the medium, and only allowing the medium to flow in one direction to prevent accidents. Generally, this type of valves should be installed horizontally in the pipeline.
High pressure check valve is open or close by the closure and medium to prevent the backflow of the medium. High pressure check valve belongs to automatic valve, which is mainly used in the pipeline where the medium flows in one direction and only allows the medium to flow in one direction to prevent accidents
Lug type dual plate check valves are mainly composed of body, disc, stem and spring. Due to its short structure, light weight, short disc closing stroke and fast closing, it can reduce water hammer. The disc is a semi-circular dual plate structure, which can rotate around the rotating shaft in the valve body. The stress of the rotating shaft must be on the same plane with the sealing surface of the valve body, so as to ensure the sealing when the valve is closed. Connection type: it adopts dual plate lug type is, which can make the valve body more beautiful in appearance, small volume and light in weight.
The dual plate check valve is used in pure pipelines and industrial, environmental protection, water treatment, building water supply and drainage pipelines, to prevent reverse flow of medium. This type valve adopts dual plate, and it is forcibly reset by the spring. The sealing surface can be welded wear material or rubber lining. It has characteristics of wide application range and reliable sealing.
The disc of lift check valve is located on the valve seat sealing surface. And the disc can be free to move up and down, other parts is like a globe valve. When the fluid passes, the disc is lift from the seat sealing surface. When the fluid back flow, the disc falls back onto the seat and cut off the flow. Depending on the condition of using, the disc can be made of full metal construction, or be in rubber or rubber ring on the disc holder.
Single disc check valve is mainly made of valve body, disc and spring. It can be installed horizontally or vertically on pipeline system, to prevent medium backflow. It is expecially suitable for applications where the installation space is limited. This type valve is used in water, steam, oil, nitrate, and strong oxidizing media.
The wafer type lift check valve is suitable for the working temperature of -196℃~540, to prevent backflow of medium. According different materials, the wafer type lift check valve can be applied to various medium, such as water, steam, oil, nitric acid, acetic, strong oxidizing medium and urea in petrochemical, metallurgy, electric power, light industry and food industries. Different from flange type lift check valve, the wafer type lift check valve has characteristics of short structure length, small volume, light weight, small water hammer pressure, convenient installation, etc.
The tilting disc check valve is a non slam check valve. Its main advantage is to overcome the impact and water hammer phenomenon caused by swing check valve and lift check valve, and realize non-impact operation.
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