Check valveThe non-return valves or check valves are used to block the reverse flow of oil or gas in a fluid power circuit. china Gate valve Additionally this valve may be used for pressure control or directional control. The check valve consists of a valve body with inlet and outlet ports and an internal movable member biased by the spring. The movable member can be a flapper or a plunger but most often in valves of hydraulic systems, it is a ball or poppet. They are built to provide free flow in one direction and a check in the other direction and prevent flow-back in hydraulic systems. China valve Check valves are of several styles: swinging disc, china valve supplier ball, plunger, and poppet. Check valves of the pilot-operated type are also popular. The connection at the bottom is connected to a remotely operated pilot valve, As in the ordinary check valve, SEOfree flow is permitted in one direction when the line pressure lifts the plunger thus opening the valve. The flow is checked in the opposite direction until pilot pressure is applied to the blind end of the plunger through the pilot connection. This causes the plunger to unseat the valve spool and oil is allowed to flow through the valve. China valve manufacturer

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