Check valve knowledge

Check valve, also known as check valve or check valve. Used in hydraulic systems to prevent reverse flow of oil.

One-way valve has straight-through and right angle two kinds. Straight-through check valves are threaded on the piping. Right-angle check valves are available in threaded, plate and flanged versions. A pilot-operated check valve is also called a lock-up valve or a pressure-retaining valve. It is the same as a check valve to prevent the reverse flow of oil. However, when the oil flow in the hydraulic circuit is required to reverse flow, the oil pressure can be controlled to open the check valve so that the oil flow can flow in both directions. The pilot-operated check valve adopts a conical valve core, so the sealing performance is good. When it is required to close the oil circuit, this valve can be used as a one-way lock of the oil circuit to hold the pressure. There are two types of leaks in the pilot-operated check valve control oil: the internal leak type and the external leak type. In the reverse direction of the oil flow reverse outlet, the internal drain type can be used; otherwise an external leak type is required to reduce the control oil pressure.