Shuangda Hydraulic Machinery is one of the professional check valve manufacturers and suppliers in China,Website:://.chinahydraulic-valve.com, welcome to buy cheap and low price check valve made in China from our factory.Usage and characteristicWhen the flow in the CI/CR check valve is in the forward direction, if the pressure of the inlet is bigger than the opening pressure, the oil can flow through the check valve, otherwise the oil will be blocked so that the CI/CR check valve can control the flow direction.With the optimized flow way of the valve,cam operated directional valves have the features of high pressure, big flow, small pressure loss, energy saving, strong anti-pollution ability and light weight.