Hydraulic compound valve based on sequential pressure reduction overflow function

Abstract

The invention discloses a hydraulic compound valve based on a sequential pressure reduction overflow function. The hydraulic compound valve comprises a valve sleeve, a valve core and a pressure spring, wherein a valve cavity is formed in the valve sleeve, a high-pressure oil port P, a secondary pressure port B and an oil return port T are formed in the valve sleeve, a center oil way is formed in the bottom surface of the valve core, an annular control groove is machined in the circumferential face of the valve core, a pressure oil port used for communicating the port P and the center oil way in the radial direction is formed in the annular control groove, a connecting oil hole used for communicating the center oil way and the port B after the valve core moves upwards is further machined inthe valve core, a control edge of the annular control groove and an opening edge of the port P form a throttling area for realizing the pressure reduction function of the valve when the valve core moves upwards, an upper shoulder with longitudinal sections on two sides and a lower shoulder positioned below the upper shoulder are formed on the valve core, when the valve core is in an original state, the port B communicates with the port T, and the longitudinal sections is matched with an inner shoulder of the valve sleeve when the valve core moves upwards to form a damping channel capable of enabling a part of oil of the port B to be shunted back to the port T to achieve the overflow function of the valve.

Description

technical field [0001] The invention relates to the technical field of hydraulic control, in particular to a hydraulic valve with composite function, in particular to a hydraulic composite valve based on sequential decompression and overflow function. Background technique [0002] Hydraulic valves are widely used in hydraulic equipment and hydraulic components. Hydraulic valves are divided into plate type, pipe type and cartridge type. Due to the limitation of the space structure of equipment and components, cartridge hydraulic valves have been widely used in compact hydraulic components. Especially in the hydraulic rotary motor, it is widely used because of its small size, convenient installation and great space saving. But at present, most rotary motors have an independent cartridge valve corresponding to one function, so there will be higher requirements on the space design of the plug-in body. Often, many densely packed cartridge valves are arranged on the valve body, ...

AI Technical Summary

Problems solved by technology

Often, many densely packed cartridge valves are arranged on the valve body, which brings troubles to use, installation and subsequent maintenance

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