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Check valve refers to a kind of valve whose opening and closing parts are circular flaps and rely on its own weight and medium pressure to block the backflow of medium. When the inlet pressure is greater than the weight of the flap and the flow resistance, the valve is opened. On the contrary, the valve is closed when the medium flows backward. The swing check valve has an oblique flap that can rotate around the axis. The working principle is similar to the lift check valve. Check valves are often used as bottom valves of pumping devices to prevent water from flowing back. The combined use of check valve and globe valve can play a role of safety isolation. The disadvantage is that the resistance is large, and the sealing is poor when closed.
working principle
The check valve can also be used to replenish an auxiliary system where the pressure may rise above the system pressure. Check valves can be divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).
The role of this type of check valve is to only allow the medium to flow in one direction and prevent the flow in the opposite direction. Usually this kind of valve works automatically. Under the effect of fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the opposite direction, the valve flap acts on the valve seat by the fluid pressure and the self-coincidence of the valve flap, thereby cutting off the flow.
Company Profile
2005——Start to produce ceramic lined valve series.
2006——Start to produce rubber seat dome valve, knife gate valve and pinch valves.
2010——Joint venture start to produce Teflon plastic lined valve series.
2016——VerSpec US warehouse operated in Akensas.
2018——VerSpec Korea branch operated in Cheonnam.
2019——VerSpec India and VerSpec Mexico start operating.
Tel: +86-577-57666870
Fax:+86-577-56769885
E-mail: info@verspec.com
