Our common commutation basic circuit is shown in Figure 1. It consists of an oil pump, a fuel tank, a medium pressure relief valve, an electromagnetic reversing valve and a cylinder. According to the circuit, our factory manufactured a hydraulic device for installing the steel hammer handle. After use, it was found that the system was hot and could not be used. The analysis is due to the position of the two-position four-way reversing valve in the position shown in Figure 1. When the piston rises to the top position, the non-working position, that is, the in-situ state time is longer, and the hydraulic oil output from the oil pump
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