The functions of the liquid-controlled check valve are as follows:
1, maintain the pressure slide valve type directional valve has a gap leakage phenomenon, can only maintain pressure for a short time. When there are pressure requirements, a hydraulic control check valve can be added to the oil circuit, and the tightness of the taper valve is used to keep the pressure of the oil circuit for a long time.
2, the hydraulic cylinder \"support\" in the vertical hydraulic cylinder, due to the leakage of the slide valve and tube, under the gravity of the piston and piston rod, may cause the piston and piston rod to slide. The hydraulic control check valve is connected to the oil circuit in the lower chamber of the hydraulic cylinder to prevent the sliding of moving parts such as the hydraulic cylinder piston and slide block.
3, realize the hydraulic cylinder lock when the reversing valve is in the middle, the two hydraulic control check valves are closed, which can tightly seal the oil in the two chambers of the hydraulic cylinder, and the piston can not move due to external force.
4. The effective working area of the two cavities of the large flow discharge hydraulic cylinder is very different.
5. When the piston is returned, the oil discharge from the right chamber of the hydraulic cylinder suddenly increases. At this time, if the slide valve with small flow rate is used, the throttling effect will be generated and the backward speed of the piston will be limited. If the hydraulic control check valve is added, when the hydraulic cylinder piston is retreating, the pressure oil will be controlled to open the hydraulic control check valve, and the oil in the right chamber can be discharged smoothly.
6, the piston of the vertical hydraulic cylinder of the oil filling valve in the process of high-speed decline, due to the role of high pressure oil and self-weight, resulting in rapid decline, resulting in suction and negative pressure, it is necessary to add an oil filling device. The hydraulic control check valve is used as an oil filling valve to complete the oil filling function.
7, combined into a reversing valve in the design of hydraulic circuit, sometimes the hydraulic control check valve can be combined into a reversing valve. For example, using two liquid-controlled check valves and one check valve in parallel (check valve centered) is equivalent to the reversing circuit of a three-way reversing valve. It should be pointed out that when the control pressure oil port does not work, it should be passed back to the tank, otherwise the control piston is difficult to reset, and the check valve cannot cut off the liquid flow in reverse.