PVC VALVE
What is PVC check valve?
PVC check valve is also known as check valve. Its function is to ensure the directional flow of the medium in the pipeline without backflow. The bottom valve of the water pump suction pipe also belongs to the check valve.
A check valve refers to the valve that automatically opens and closes the valve flap by relying on the flow of the medium itself to prevent the backflow of the medium, also known as a check valve, one-way valve, reverse flow valve, and back pressure valve. the discharge of the container medium. Check valves may also be used on lines supplying auxiliary systems where the pressure may rise above system pressure.
The purpose of this type of valve is to allow the medium to flow in only one direction and prevent flow in the opposite direction. Usually, this kind of door works automatically. Under the action of fluid pressure flowing in one direction, the valve disc opens; when the fluid flows in the opposite direction, the fluid pressure and the self-coincident valve
Among them, the check valve belongs to this type of valve, which includes the swing check valve and lifts check valve. Swing check valves have a hinge mechanism and a door-like disc that rests freely on the sloping seat surface. In order to ensure that the valve disc can reach the proper position of the valve seat surface every time, the valve disc is designed in the ammonium chain mechanism, so that the valve disc has enough swing space and makes the valve disc truly and comprehensively contact the valve seat. The disc can be all made of metal. Metals can also be inlaid with leather, rubber, or synthetic overlays, depending on the performance requirements. In the fully open condition of the swing check valve, the fluid pressure is almost unimpeded, so the pressure drop across the valve is relatively small. The disc of the lift check valve is located on the sealing surface of the valve seat on the valve body. The valve is like a globe valve except that the valve can be lifted up and down freely. The fluid pressure lifts the valve disc from the seat sealing surface, and the backflow of the medium causes the valve to fall back to the valve seat and cut off the flow. According to the conditions of use, the disc can be of all-metal structure, or it can be in the form of a rubber pad or rubber ring embedded in the disc holder. Like the globe valve, the passage of the flow through the lift check valve is also narrow. Therefore, the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow of the swing check valve is less restricted.
In daily life, discarding items and wastes in the main sewer pipe (drain pipe) causes the pipe to be blocked. When the daily wastewater of the upstairs neighbors flows into the blocked main sewer pipe, there will be a backflow problem. When the upstairs neighbors concentratedly discharge wastewater into the sewer pipes, the air in the pipes will be compressed, which will create pressure on the water supply in the traps connected to the main sewer pipes on the lower floors, resulting in the problem of water backflow.
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