In the hydraulic test process in order to simplify the test system, often encountered in the same oil and the need to detect both high and low pressure, such as the minimum
Cylinder starting pressure and pressure test. In order to meet the requirements of the test accuracy, high and low voltage test can not use the same pressure gauge at the same time, which requires the low voltage test device is closed in the test of high voltage to protect the low voltage device is not damaged, but in practice, often occurs Forget the case of an accident when the low-voltage device is turned off. In order to completely solve this problem, the author designed and manufactured an automatic pressure switch valve. By using the device, the damage of the low-voltage device can be effectively avoided, and the high-voltage and low-voltage test needs can be met at the same time. This automatic pressure switching valve can also be used for single-pump system with large load changes to form a load sensing system and play an energy-saving role. 1 Structure and working principle Automatic pressure switching valve is mainly composed of adjusting screw, adjusting spring, control valve and valve body. The low pressure test instrument connected to the valve p1 port, high pressure instrument connected to the p2 port, the pressure oil source connected to the p port. When the switching valve is operated, the control spool 4 is simultaneously subjected to the hydraulic forces f1 acting on the a1 plane by the pressurized oil entering the valve chamber, the hydraulic forces f2 and f3 acting on the a2 plane and the a3 plane, and the spring force generated by the spring compression ft, as shown in Figure 2. Because when the structure of the switching valve size is determined, f1, f2 and f3 are only proportional to the hydraulic oil pressure p, these three forces can be reduced to a force fy. fy = cp where c - constant spring force: ft = k.Δx
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