Precision pressure regulating type direct-acting overflow valve

Abstract

The invention discloses a precision pressure regulating type direct-acting overflow valve which comprises a valve seat (1), a valve core (2), a fixing screw rod (3), a magnetic yoke (4), a permanent magnet (6), a spring (8), a spring seat (9), a valve body (10) and a pressure regulating screw rod (11). The valve core (2) slides along an inner chamber of the valve seat (1); a right end face of the valve core (2) is connected with the magnetic yoke (4); the permanent magnet (6) is fixed on the fixing screw rod (3) which is connected with the valve core (2); the pressure regulating screw rod (11) is connected with the valve body (10); the pressure regulating screw rod (11) is rigidly contacted with a right end face of the spring seat (9); a left end face of the spring seat (9) is rigidly contacted with a right end face of the spring (8); and a left end face of the spring (8) is rigidly contacted with the right end face of the valve core (2). The precision pressure regulating type direct-acting overflow valve overcomes the defect of control pressure fluctuation caused by a direct-acting overflow valve due to the overflowing rate variation and achieves precision control on oil pressure.

Description

technical field [0001] The invention relates to an overflow valve in a fluid control system, in particular to a precise pressure-regulating direct-acting overflow valve. Background technique [0002] In the hydraulic control system, the direct-acting relief valve realizes the control of the oil pressure through the balance of the oil pressure and the spring force. Invention patent 200380110003.0 discloses a direct control overflow valve with a seat piston in the longitudinal bore of the valve sleeve, the piston is guided radially in its guide area by two circular guide elements spaced apart from each other. In the longitudinal drilling, the vibration and noise of the piston when the valve port is opened and closed is reduced, and the service life is increased. However, the overflow flow of the overflow valve seriously affects the pressure control accuracy of the overflow valve, because: when the overflow flow of the overflow valve changes, the opening of the valve changes a...

AI Technical Summary

Problems solved by technology

However, the overflow flow of the overflow valve seriously affects the pressure control accuracy of the overflow valve, because: when the overflow flow of the overflow valve changes, the opening of the valve changes accordingly, and the compression of the spring changes accordingly. The spring force changes, resulting in a change in the actual control oil pressure

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