The pilot operated check valve is a valve that relies on the control of fluid pressure to allow the check valve to flow in the opposite direction. Emergency Lighting System,Emergency Lights For Home Power Failure,Rechargeable Emergency Light,Led Emergency Lights Foshan Nai An Lighting Electric Co.,ltd , https://www.naipsled.com
The pilot operated check valve is a valve that relies on the control of fluid pressure to allow the check valve to flow in the opposite direction.
When the hydraulic system control oil circuit is not connected to the pressure oil, the hydraulic control check valve works like a normal one-way valve, the pressure oil only flows from the oil inlet to the oil outlet, and cannot flow in the opposite direction.
When the hydraulic system controls the oil circuit oil control pressure input, the piston ejector rod moves to the right under the action of the pressure oil, and the check valve is used to open the check valve to make the inlet and outlet ports open. If the oil outlet is larger than the oil inlet, the oil can flow in the opposite direction.
The main functions of the pilot operated check valve are as follows:
1, to achieve hydraulic cylinder locking
When the reversing valve is in the neutral position, the two pilot operated check valves are closed, and the oil in the two chambers of the hydraulic cylinder can be tightly sealed, and the piston cannot be moved by the external force.
2, maintain pressure
1 Spool valve type reversing valve has gap leakage phenomenon, which can only keep pressure for a short time.
2 When there is pressure requirement, a hydraulic control check valve can be added to the oil circuit to make the oil circuit keep pressure for a long time by using the tightness of the closing of the cone valve.
3, the "support" of the hydraulic cylinder
1 In the vertical hydraulic cylinder, due to the leakage of the spool and the pipe, the piston and the piston rod may be caused to fall under the gravity of the piston and the piston rod.
2 Connect the hydraulic control check valve to the oil passage in the lower chamber of the hydraulic cylinder to prevent the hydraulic cylinder piston and the slider from sliding down.
4, large flow discharge oil.
1 The effective working area of ​​the two chambers of the hydraulic cylinder varies greatly.
2 When the piston is retracted, the oil displacement in the right chamber of the hydraulic cylinder suddenly increases. At this time, if a small flow spool valve is used, a throttling effect will be generated to limit the retreating speed of the piston;
3 If the hydraulic control check valve is added, when the hydraulic cylinder piston retreats, the control pressure oil will open the hydraulic control check valve, and the right cavity oil can be smoothly discharged.
5, as a charge valve.
1 In the process of high-speed descent of the piston of the vertical hydraulic cylinder, due to the action of high-pressure oil and self-weight, the drop is rapid, resulting in suction and negative pressure, and an oil-filling device must be added.
2 The hydraulic control check valve is used as an oil filling valve to complete the oil filling function.
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