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Overview of lift check valvesRelease Date: February 23, 2016
Overview of lifting check valve Wenzhou Xinrongda Valve Fittings Co., Ltd. was established in 1998. The company's products now include regulating valves and accessories, universal valves, temperature reducing and reducing devices, automatic recirculation control valves, electromagnetic Valves, API6A valves, etc. Control valves and accessories include: pneumatic control valves, electric control valves, self-operated control valves, manual control valves, pneumatic diaphragm actuators, electric actuators, electrical valve positioners, electric valve adjustment modules, etc.
Lift check valve refers to the valve that automatically opens and closes the valve flap depending on the flow of the medium itself to prevent the medium from flowing backward. It is also known as a check valve, check valve, reverse flow valve, and back pressure valve. The check valve is an automatic valve, and its main function is to prevent the medium from flowing backward, to prevent the pump and the drive motor from reversing, and to release the medium from the container. Check valves can also be used to supply lines to auxiliary systems whose pressure may rise above the system pressure. Check valves can be mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).
The purpose of this type of valve is to allow the medium to flow in only one direction and to prevent reverse flow. Usually this kind of valve works automatically. Under the action of fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the opposite direction, the pressure of the fluid and the self-reclosing valve flap of the valve act on the valve seat to cut off the flow.
Among them, internal check valves , butterfly check valves belong to this type of valve, which includes swing check valves and lift check valves. The swing check valve has a hinge mechanism, and a door-like flap rests freely on the surface of the inclined seat. In order to ensure that the valve disc can reach the proper position on the valve seat surface every time, the valve disc is designed in a hinge mechanism so that the valve disc has enough swing space and the valve disc is in full and complete contact with the valve seat. The discs can be made entirely of metal, or they can be inlaid with leather, rubber, or a synthetic covering, depending on the performance requirements. Swing check valve is fully open, the fluid pressure is almost unhindered, so the pressure drop across the valve is relatively small.
The valve disc seat of the lift check valve is located on the valve seat sealing surface on the valve body. Except that the valve disc can be lifted and lowered freely, the rest is like a stop valve. The fluid pressure causes the valve disc to lift from the sealing surface of the valve seat. The return of the medium causes the valve disc to fall back to the valve seat and cut off the flow. Depending on the conditions of use, the valve disc can be an all-metal structure, or it can be in the form of a rubber pad or rubber ring inlaid on the valve disc holder. Like the shut-off valve, the passage of fluid through the lifting check valve is also narrow, so the pressure drop through the lifting check valve is greater than that of the swing check valve, and the flow of the swing check valve is limited Rarely.
Wenzhou Xinrongda Valve Fittings Co., Ltd. currently produces products such as regulating valves and accessories, general-purpose valves, temperature reducing and reducing devices, automatic recirculation control valves, solenoid valves, API6A valves, etc. Control valves and accessories include: pneumatic control valves, electric control valves, self-operated control valves, manual control valves, pneumatic diaphragm actuators, electric actuators, electrical valve positioners, electric valve adjustment modules, etc.