The hydraulic control exhaust valve is widely used in the hydraulic circuit, but when applying this valve, the characteristics of the valve should be fully considered, otherwise the circuit will be unstable, especially in the high pressure system, the hydraulically controlled exhaust valve will open in reverse. The pressure at the front P2 port is very high. In order to reduce the control pressure, hydraulic shock and noise in the hydraulic system, a hydraulically controlled exhaust valve that also unloads the spool is used.
The hydraulic control exhaust valve is widely used in the hydraulic circuit, but when applying this valve, the characteristics of the valve should be fully considered, otherwise the circuit will be unstable, especially in the high pressure system, the hydraulically controlled exhaust valve will open in reverse. The pressure at the front P2 port is very high. In order to reduce the control pressure, hydraulic shock and noise in the hydraulic system, a hydraulically controlled exhaust valve that also unloads the spool is used. The unloading valve can improve the performance of the hydraulic control exhaust valve. The characteristic of the hydraulic control exhaust valve is that when the hydraulic control exhaust port K is in the absence of pressure oil, the pressure oil can only flow from the port P1 to the port P2. Can not be reversed. When the control port K has the control pressure oil, the oil pushes the ejector rod by the control piston, and the ejector rod opens the unloading valve core, and the main valve core opens, and the two ports of P1 and P2 are connected, and the oil can be used in the two. Free flow in one direction, unloading valve reduces hydraulic shock, making the performance of hydraulically controlled exhaust valve more stable, but there is still impact or noise in high flow high pressure system.

Hydraulically controlled venting valves are often used in pressure holding, pressure relief, and locking circuits. Due to the pressure in the system, the oil is compressed, the pipe is expanded, the components are elastically deformed, and the energy can be stored. When the pressure is released, the amount of kidney is suddenly released, and when the reversing valve is from the neutral position to the left position. Because the pressure in the upper chamber of the hydraulic cylinder is large, the pressure in the lower chamber has increased. The unloading valve and the main valve are opened at the same time as shown in Fig. 1b, so that the pressure oil in the upper chamber is suddenly released through the hydraulic control exhaust valve. Oil road. Since these two causes exist at the same time, the pressure relief after the pressure is too fast, and the shock vibration and noise are generated. For this reason, we have improved the hydraulic circuit.

Due to the high pressure and large flow liquid control exhaust valve, the pressure relief is too fast and the impact is increased. Therefore, a throttle valve is added to the circuit, so that the liquid control exhaust valve unloading valve is opened first, then opened again. The main valve, because the throttle valve has a sufficient flow control range, can ensure a stable minimum flow, easy adjustment, small leakage, temperature and pressure have little effect, so by adjusting the throttle valve, control the oil in the upper chamber of the hydraulic cylinder The pressure relief time is also extended accordingly, the pressure-reducing capacity is also enhanced, and the impact and noise of the hydraulic oil on each component are returned. The same improvement has been made to the circuit of the high-pressure and high-flow hydraulic control exhaust valve, and the results can meet the requirements without affecting the speed of the control piston.

[Friendly Tips]: With the continuous development of valve technology, the application field of valves has been continuously expanded, and the corresponding valve standards are becoming more and more indispensable. Shanghai Jiade Valve Manufacturing Co., Ltd. is a large-scale valve manufacturer with more than 20 years of history. It is one of the most important and largest general valve suppliers in China, such as gate valve, globe valve, ball valve, butterfly valve and hydraulic control valve. In the petroleum, chemical, metallurgy, electric power, construction, heat, water supply and other industries have a high reputation and influence. The products have been in short supply and are sold well in domestic and foreign markets.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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