check valve to prevent reverse flow of oil in the hydraulic system, to prevent the reverse flow of compressed air in the pneumatic system. Flowing fluid is only in the entrance, and export medium can't return. Using one-way valve in the hydraulic system of several kinds of methods:

the main results were as follows:

( 1) Check valve installed in the pump inlet to prevent the system pressure increases suddenly, damage the pump.

( 2) Such as one-way valve connected to the throttle valve or reducing valve, the actuator is reverse and fast at low speeds, or reverse free port for slow speed. ( 3) Check valve and the pressure valve series, will gradually increase to adjust pressure, prevent the stress response. ( 4) For hydraulic controlled check valve, when open check valve control oil circuit is used, the oil can't return.

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