Anti-pollution pilot operated relief valve

Abstract

The invention relates to the technical field of hydraulic pressure, particularly to an anti-pollution piloted relief valve. The relief valve comprises a valve body, a main valve plug assembly and a pilot valve assembly, wherein the main valve plug assembly consists of a sliding valve and a screw plug; the sliding valve is mounted in the valve body, and the screw plug is connected to the inner part of the sliding valve; an annular filter groove is reserved between the screw plug and the sliding valve, and a throttling hole is formed in the screw plug. According to the anti-pollution piloted relief valve, the annular filter groove is formed between the screw plug and the sliding valve, and oil fluid enters the throttling hole through the filter groove, so that the situations that in a traditional structure, the throttling hole directly faces an oil inlet, large grained pollutants block up the throttling hole or enter a rear driving cavity of the main valve plug, so as to cause the phenomena that the main valve plug and the guide valve are clamped, are avoided. An annular groove is formed in the rear driving cavity of the main valve plug and is used for depositing small pollutants entering the driving cavity, and preventing the main valve plug from being blocked and preventing the seat hole of the guide valve from being blocked. The relief valve disclosed by the invention is simple in structure, is practical and reduces the system cost.

Description

technical field [0001] The invention relates to the technical field of hydraulic pressure, in particular to a pilot overflow valve with high anti-pollution ability applied to engineering machinery hydraulic components and hydraulic systems. Background technique [0002] The pilot relief valve is a kind of relief valve, which is used to control the pressure of the hydraulic system or use the pressure as a signal to control the action of other components. Existing pilot-operated relief valves such as figure 1 , mainly including a valve body 102, a main valve core 101 and a pilot valve assembly 104, the valve body 102 is provided with an oil inlet 107 and an oil return port 106, and the main valve core 101 is set between the oil inlet 107 and the oil return port 106 In the body 102, the pilot valve seat 103 between the main valve core 101 and the pilot valve assembly 104 forms a driving chamber 105, and the main valve core 101 is provided with a damping hole 108, and the oil e...

AI Technical Summary

Problems solved by technology

Blindly pursuing the cleanliness of hydraulic fluid and reducing processing burrs will undoubtedly greatly increase the cost of the system

[0004] In addition, the aperture size of the damping hole determines the opening and closing characteristics of the relief valve. The smaller the aperture is in an appropriate range, the better the opening and closing characteristics of the relief valve. However, as mentioned above, the main valve core damping hole is too small, Easy to be blocked, causing the overflow valve to fail

Therefore, in the traditional relief valve structure, how to design a damping hole suitable for various system working conditions has always been a difficult problem

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