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Non return valves or check valves are spring loaded valves used to restrict the flow to a single direction. There is one inlet and one outlet for check valves showing the directional marking. This is to ensure that users install the check valves in correct direction wherein fluids will flow into inlet and flow out from outlet.
A minimum working pressure is required in the fluids system in using check valves. Inteva series check valves are metal closing check valve applicable in hydraulic oil applications. It can withstand up to 420 Bar working pressure. There are two common connections usually used namely NPT or BSPP.