Hand-operated pilot valve

Abstract

A hand-operated pilot valve comprises a handle, a valve body, an ejector rod, a first spring, a first spring seat, a valve seat, a valve rod, a second spring seat, a second spring and a plug, wherein one end of the handle is in rotational connection with a pin shaft in the valve body; the side surface at the bottom of the handle is propped against the ejector rod; the first spring is in sleeve joint with the ejector rod; one end of the first spring is propped against a lug boss on the ejector rod; the other end of the first spring is propped against the first spring seat; the ejector rod is in slide fit with the valve seat; an oil inlet, an oil outlet line and an oil return line are arranged on the valve seat; a blind hole and an oil return hole communicated with the blind hole are formed in the ejector rod; the valve rod is in slide fit with the valve seat; one end of the second spring is propped against the second spring seat; the other end of the second spring is propped against the plug; the second spring seat is in slide fit with the plug; one end of the plug is propped against the valve seat; the other end of the plug is in threaded connection with the valve body; and an oil chamber is communicated with the oil outlet line through a communication oil line. The hand-operated pilot valve is simple in structure, good in sealing performance and convenient to operate.

Description

technical field [0001] The invention relates to a pilot valve, in particular to a manual pilot valve. Background technique [0002] The website of the State Intellectual Property Office discloses a manual pilot valve. The pilot valve includes a valve body, a valve core assembly composed of a valve stem and two steel balls, a handle, a cam-shaped handle and a push rod. One end of the cam-shaped handle is hinged to the handle. The other end of the cam-shaped handle is connected with the ejector rod, and the steel ball in the valve core assembly is pushed by the ejector rod to open or close the oil circuit, realizing the function of the pilot valve to manipulate other valves or components. Its disadvantages are as follows: first, there are two handles, and the connection structure between the cam-shaped handle and the ejector rod is complicated, resulting in a complicated structure of the entire manual pilot valve; second, the steel ball in the valve core assembly is easy to se...

AI Technical Summary

Problems solved by technology

Its disadvantages are as follows: first, there are two handles, and the connection structure between the cam-shaped handle and the ejector rod is complicated, resulting in a complicated structure of the entire manual pilot valve; second, the steel ball in the valve core assembly is easy to seal. Leakage occurs, resulting in poor sealing performance; third, because the two steel balls are still in contact with high-pressure hydraulic oil, the resistance received when operating the handle is still relatively large, making the operation inconvenient

Images