Flow type leakage-free superposed double-balance valve

Abstract

The invention discloses a flow type leakage-free superposed double-balance valve, and belongs to balance valves. The flow type leakage-free superposed double-balance valve structurally comprises two balance valve inserts, a valve body and a control piston, the two balance valve inserts are respectively arranged in insertion holes in the left side and the right side of the valve body, and the control piston is arranged in a valve body inner hole between the two balance valve inserts. Compared with the prior art, the flow type leakage-free superposed double-balance valve has the multiple functions of leakage-free pressure maintaining, pre-pressure relief and the like, an oil cylinder can stay at any position for a long time without leakage, the pre-pressure relief duration can be set at will, system power consumption is reduced, and therefore the flow type leakage-free superposed double-balance valve has good application and popularization value.

Description

technical field [0001] The invention relates to a balance valve, in particular to a flow type non-leakage superimposed double balance valve. Background technique [0002] Balance valves are called load holding valves, load control valves, etc. in foreign countries. They are often used in hydraulic systems where cylinders do variable amplitude movements to control the load to run smoothly, prevent the cylinder from stalling and the load can reliably stay at any position when the cylinder stops running, but the current hydraulic balance The vast majority of valves are pressure-type balance valves, and pressure-type balance valves generally cannot be used for long-term pressure maintenance, and the power loss is large; although the FD series flow-type balance valves of German technology can be used for pressure maintenance and reduce power consumption, but in Under certain working conditions, it usually needs to be used together with a one-way throttle valve to solve the proble...

AI Technical Summary

Problems solved by technology

[0002] Balance valves are called load holding valves, load control valves, etc. in foreign countries. They are often used in hydraulic systems where cylinders do variable amplitude movements to control the load to run smoothly, prevent the cylinder from stalling and the load can reliably stay at any position when the cylinder stops running, but the current hydraulic balance The vast majority of valves are pressure-type balance valves, and pressure-type balance valves generally cannot be used for long-term pressure maintenance, and the power loss is large; although the FD series flow-type balance valves of German technology can be used for pressure maintenance and reduce power consumption, but in Under certain working conditions, it usually needs to be used together with a one-way throttle valve to solve the problem of crawling when the loaded oil cylinder runs vertically, and the FD series balance valve is difficult to process into a stack that can be installed on the integrated oil circuit block under the reversing valve Type double balance valve structure

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