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The one-way valve only allows the flow to pass freely in one direction but does not pass in the opposite direction. The pilot-operated check valve allows the flow to pass freely in one direction. In the opposite direction, the check valve can be opened by the control pressure oil so that the flow can pass through. When the control pressure is too low or disappears, the flow cannot pass.
Second, the failure mechanism (a) hydraulic control failure by the principle of hydraulic control check valve, when the control piston does not apply pressure oil, it is like a general check valve; when the control piston on the role of pressure oil, positive and negative The direction of the oil can flow. The so-called hydraulic failure refers to the latter. When there is pressure oil acting on the control piston, the oil in the forward and reverse directions cannot be realized.
(B) Large vibration and shock, slight noise (C) When no hydraulic control signal is issued (no pressure oil is applied to the control piston), the one-way valve is opened, and the positive and negative oil can be leaked (four). External leak
Hydraulic control check valve failure principle
First, the introduction of hydraulic check valve is to increase the liquid control part of the ordinary check valve.