Explains the working principle of the pilot-operated check valve
The core prompts: The working principle of the liquid-controlled check valve: The liquid-controlled check valve is a valve that can control the fluid pressure and can make the check valve reverse flow. This kind of valve has a comparative advantage in the hydraulic support equipment of coal mine machinery
The working principle of the liquid-controlled one-way valve: The liquid-controlled one-way valve is a valve that can control the fluid pressure and can make the check valve reverse flow. This valve occupies an important position in the hydraulic support equipment of coal mine machinery. The difference between a pilot-operated check valve and an ordinary one-way valve is that there is one additional control circuit K. When the control circuit is not connected to the pressure fluid, the pilot-operated check valve works like an ordinary one-way valve. Only from the oil inlet to the oil outlet can not reverse flow. When the control oil line control pressure is input, the piston top rod moves to the right under the action of the pressure oil, and the top rod opens the one-way valve so that the inlet and outlet ports are connected. If the oil outlet is larger than the oil inlet, the oil flow can be reversed. (1) Keep pressure. The spool valve has gap leakage and can only hold pressure for a short period of time. When there is a pressure-retaining requirement, a pilot-operated check valve can be added to the oil passage to make use of the tightness of the poppet valve closure to maintain the oil pressure for a long time.
(2) The "support" of the hydraulic cylinder. In vertical hydraulic cylinders, due to the leakage of the slide valve and the pipe, under the gravity of the piston and the piston rod, the piston and the piston rod may be caused to slide. Connecting the pilot-operated check valve to the oil passage in the lower chamber of the hydraulic cylinder can prevent the active parts of the hydraulic cylinder piston and slider from sliding down.
(3) to achieve hydraulic cylinder lock. When the reversing valve is in the neutral position, the two pilot-operated one-way valves close and the fluid in the two chambers of the hydraulic cylinder can be tightly sealed. At this time, the piston cannot move due to external forces.
(4) Large flow of oil. The effective working area of ​​the two chambers of the hydraulic cylinder varies greatly. When the piston is retracted, the oil discharge amount in the right chamber of the hydraulic cylinder suddenly increases. At this time, if a small flow rate slide valve is used, a throttling effect will be generated to limit the retreat speed of the piston; if a pilot-operated check valve is added, the hydraulic cylinder When the piston retreats, the control pressure oil opens the pilot-operated check valve so that the right-hand oil can be smoothly expelled.
(5) as filling valve. The piston of the vertical hydraulic cylinder falls rapidly during the high-speed descent process due to the action of high-pressure oil and its own weight, resulting in suction and negative pressure, and an oil replenishing device must be added. The pilot-operated check valve is used as a fill valve to complete the charge function.
The working principle of the above liquid-controlled check valve is relatively simple. With the gradual development of the technological society, we will be able to access more and more high-tech products. As we experience and use them, if we can master the basic principles of these devices, it will also be useful to maintain them in normal use.
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