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| Pilot operated check valve with the proper use of the throttle | | admin：admin issue：2012/11/20 8:22:35 cake：4191 | A wide range of pilot operated check valve in the hydraulic circuit, but the application of this valve should fully consider the characteristics of the valve, otherwise it will cause loop instability, especially in the high-pressure system, pilot operated check valve reverse openthe P2 port high pressure, shown in Figure 1a, in order to reduce the control pressure in the hydraulic system, hydraulic shock and noise using the unloading spool hydraulic operated check valve, unloading valve, hydraulic control cancheck valve with improved performance characteristics of the one-way valve in the hydraulic control K in the pressure oil pressure oil from port P1 to port P2 only, not the reverse, when the pilot operated check valve port. Control port K control pressure oil flow due to control piston driven ejector and top peak of the staff to open unloading spool main spool opens, connected to P1, P2 two-way ports, oil in two free flow in one direction, unloading valves reduce hydraulic shock, more stable performance of hydraulic controlled check valve, but there are still large flow high pressure system impact or noise.
The pilot operated check valve is normally used in the holding pressure, pressure relief, locking the loop. Due to the system the Mediator pressure process, pressure, fluid compression, pipeline expansion components elastically deformed can store energy, kidney sudden release in pressure relief valve from bit to the left position unloading valve and the main valve, the upper chamber of the hydraulic cylinder pressure, the pressure has increased in the inferior vena almost simultaneously open, so that the upper chamber pressure oil suddenly released into the return oil through the pilot operated check valve. Pressure relief after leaving the holding pressure due to two reasons exist too fast, resulting in shock and vibration and noise, the class hydraulic circuit improvements.
Due to high pressure and large flow fluid operated check valve causes a pressure relief too quickly, so that the impact to increase this in the loop with a throttle, so that the pilot operated check valve unloading valve open first, then open the main valve, since the throttle valve has a sufficient range of flow control, it can ensure the stability of minimum flow, easy adjustment, leakage small impact, temperature and pressure is also small, so by adjusting the throttle valve, the control of the oil of the hydraulic cylinder chamber pressure relief time also be extended accordingly, sinks pressure will also be increased, the hydraulic oil return on the impact of the various components and noise. |
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