Product Overview: Check valve It refers to the valve that automatically opens and closes the valve clack depending on the flow of the medium itself, and is used to prevent the backflow of the medium. It is also called check valve, one-way valve, backflow valve, and back pressure valve. The check valve belongs to an automatic valve, which is mainly used to prevent the backflow of medium, prevent the reverse rotation of pump and drive motor, and discharge the container medium.
Operating principle
The check valve can also be used to supply supply lines for auxiliary systems where the pressure may rise above the system pressure. Check valves are mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).
Check valve The function of this type of valve is to allow the medium to flow in only one direction and prevent the flow in the opposite direction. Usually, this valve 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 reclosing valve disc of the valve disc act on the valve seat to cut off the flow.
Check valve belongs to this type of valve, which includes swing check valve and lift check valve. The swing check valve has a hinge mechanism, and a valve disc like a door freely leans against the inclined valve 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 hinge mechanism, so that the valve disc has enough swing space, and the valve disc really and comprehensively contacts the valve seat. The valve disc can be made of metal, or inlaid with leather, rubber or synthetic coverage on the metal, depending on the performance requirements. When the swing check valve is fully opened, the fluid pressure is almost unimpeded, so the pressure drop through 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. Except that the valve disc can rise and fall freely, the rest of the valve is like a globe valve. The fluid pressure lifts the valve disc from the sealing surface of the valve seat, and the medium backflow causes the valve disc to fall back to the valve seat and cut off the flow. According to the service conditions, the valve disc can be of all metal structure, or it can be inlaid with rubber gasket or rubber ring on the valve disc holder. Like the stop valve, the passage of fluid through the lift check valve is narrow, so 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 rarely restricted.
