Hydraulic reversing valve with overloading protecting function during pressure maintaining

Abstract

The invention relates to a hydraulic reversing valve with an overloading protecting function during pressure maintaining, which comprises a hydraulic reversing valve body and a hydraulic cylinder, wherein a hydraulic fluid port of the hydraulic reversing valve body is connected into an oil tank. The hydraulic reversing valve also comprises a safety overflow valve and a shuttle valve, an oil tube connecting from the hydraulic fluid port of the hydraulic cylinder is divided into two branches, one branch is connected into the hydraulic reversing valve body and the other branch is connected into the shuttle valve, an oil outlet of the shuttle valve is connected with an oil inlet of the safety overflow valve, and an oil outlet of the safety overflow valve is connected into the hydraulic reversing valve body through a pipeline; and a pipeline connecting from the oil inlet is provided with a one-way valve, an oil tube connecting from the outlet end of the one-way valve is divided into two branches, one branch is connected into the hydraulic reversing valve body and the other branch is connected into the shuttle body. The invention has overloading protecting function during pressure maintaining, avoids cylinder explosion and the condition that one weak link in a system is damaged, enlarges the application range of the hydraulic reversing valve, and ensures that the hydraulic reversing valve is safer and more reliable.

Description

technical field [0001] The invention relates to a hydraulic reversing valve, in particular to a hydraulic reversing valve with an overload protection function in the pressure maintaining process. Background technique [0002] With the development of the economy, the application of dump trucks has become more and more extensive. As a hydraulic reversing valve used in conjunction with dump trucks, it has also been widely developed. At present, the hydraulic distribution valve used in China is only equipped with overload protection when the oil inlet is overloaded. Once the oil enters the oil cylinder, if there is a sudden change in pressure during the pressure holding process, there is no design for pressure holding overload protection, which leads to As a result, the cylinder may explode or a weak link in the system may be damaged. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings in the prior art and provide a hydrauli...

AI Technical Summary

Problems solved by technology

At present, the hydraulic distribution valve used in China is only equipped with overload protection when the oil inlet is overloaded. Once the oil enters the oil cylinder, if there is a sudden change in pressure during the pressure holding process, there is no design for pressure holding overload protection, which leads to As a result, the cylinder may explode or a weak link in the system may be damaged.

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