Pressure peak control valve used for hydraulic system

Abstract

The invention relates to a pressure peak control valve used for a hydraulic system. According to the technical scheme of the pressure peak control valve used for the hydraulic system, a main valve seat (2) is arranged in a round hole at the inner side of the left end of a main valve body (1), a pressure-adjusting threaded rod (7) is arranged at the right end of the inside of the main valve body (1) through threads, the right end of an umbrella-shaped main valve element rod (5) is movably arranged in the round hole of the pressure-adjusting threaded rod (7) in a coaxial mode, a main valve element (4) is fixedly connected with the left end of the umbrella-shaped main valve element rod (5), the umbrella-shaped main valve element rod (5) is provided with a belleville spring (20), a main valve control oil hole (21) and a main valve oil inlet hole (18) are communicated through an oil duct (19), a guide valve element (15) is arranged in a guide valve body (16), the guide valve body (16) is provided with a guide valve first oil inlet hole (17), a guide valve second oil inlet hole (11) and a guide valve control oil hole (14), a guide valve is arranged on the main valve body (1), and the main valve oil inlet hole (18) is communicated with the guide valve control oil hole (14). The pressure peak control valve used for a hydraulic system has the advantages of being simple in structure, wide in pressure adjustment range, high in accuracy, small in pressure vibration and swing, good in dynamic property, and high in reliability, thereby being suitable for combined use with a hydraulic cylinder and hydraulic pump.

Description

technical field [0001] The invention belongs to the technical field of hydraulic system pressure control valves. In particular, it relates to a pressure peak control valve for a hydraulic system. Background technique [0002] The pressure peak control valve is an important component of the hydraulic system. When the system pressure exceeds the set pressure, it will open the overflow to protect the hydraulic system and reduce the impact. The pressure control valve used in the hydraulic system is required to have the characteristics of simple structure, large pressure adjustment range, high precision, small pressure swing, good dynamic performance and high reliability. [0003] At present, the relief valve is widely used. The ordinary direct-acting relief valve adjusts the pre-compression of the coil spring through the pressure regulating handle, changes the spring pre-compression force, and provides different command forces, representing the resultant force of the hydraulic ...

AI Technical Summary

Problems solved by technology

The structure of this type of valve is complex, the damping hole is easy to block, the anti-pollution ability is poor, and the coil spring is easy to deform and break, which will have a great impact on the working performance of the valve after damage; the pilot overflow response speed is slow and the sensitivity is low; due to the vibration of the coil spring, resulting in The pressure swing of the relief valve is large; under the working conditions of heavy load, high speed and reciprocating motion, when the hydraulic cylinder changes direction or stops, it is easy to generate high pressure peaks. Ordinary single relief valve can only control the pressure of one cavity, which cannot meet the Condition requirements

According to statistics, 50% of hydraulic system failures are caused by hydraulic control valves

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