Novel electric-hydraulic proportional overflow valve

Abstract

The invention relates to a novel electric-hydraulic proportional overflow valve which comprises an overflow valve body, a pilot valve and an electric-hydraulic reversing valve. A main valve seat of the overflow valve body is installed in a main valve body. The outer surface of the main valve seat of the overflow valve body is matched with the main valve body, and the inner surface of the main valve seat of the overflow valve body is matched with a main valve element. Resetting and partial sealing are achieved on the main valve element through a spring. A runner for leading in high-pressure oil is formed in the right end of the valve body of the electric-hydraulic reversing valve. A spring is installed at the right end of the valve element of an electromagnetic valve. Axial movement of the electric-hydraulic reversing valve to the valve element is achieved under common action of spring force, hydraulic force and electromagnetic force. A push cylinder structure is composed of the valve element of the pilot valve, the valve body of the pilot valve and a cover plate; axial movement of the valve element of the pilot valve is controlled through the electric-hydraulic reversing valve; and a large-rigidity pressure-adjusting spring which is traditionally used is replaced for adjusting the pressure of the overflow valve body, and the adjusting pressure of a system is improved. The stability of the overflow valve body is improved by changing the intensity of electromagnetic force, the control precision of the overflow valve body is improved, and the novel electric-hydraulic proportional overflow valve is suitable for high-pressure large-flow hydraulic control systems.

Description

technical field [0001] The invention relates to the field of fluid control, in particular to a novel electro-hydraulic proportional overflow valve. Background technique [0002] Relief valves play the role of pressure regulating valves and safety valves in hydraulic systems, and are widely used in multi-stage pressure control of electro-hydraulic systems such as forging synchronous control systems, machine tool feed systems, automobile steering systems, and ship controllable pitch propellers. . From manual relief valves, electromagnetic relief valves to digital relief valves that appear now, due to the rapid development of high-end hydraulic equipment, higher requirements are put forward for relief valves. The overflow valve with small pressure regulation deviation, small pressure overshoot, and low vibration and noise provides a broad market space. [0003] In the current construction machinery system, the proportional relief valve is divided into direct-acting type and p...

AI Technical Summary

Problems solved by technology

Due to the change of pressure during the working process of the system, the spool of the pilot valve is often in the open-closed working state, which makes the spool of the pilot valve collide with the seat of the pilot valve frequently, which not only produces noise pollution, but also makes the spool of the pilot valve or The seat of the pilot valve is worn, which affects the sealing, reduces the performance of the relief valve, and even makes the relief valve scrapped. Especially under high pressure, the wear phenomenon is more serious, and the relief valve needs to be replaced frequently, which increases the cost

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