A load control valve integrating a large flow relief function into the main spool

Abstract

The invention discloses a load control valve which integrates a large flow overflow function into a main valve core. Including the main valve body, pilot valve body, main valve core, main valve sleeve, feedback spring, pilot valve sleeve, pilot valve core, pilot compression spring, control piston and control end cover; the load control valve has an oil return chamber, load Cavity, control sensitive cavity, fast closing cavity, internal volume cavity of pilot spool, pilot oil drain cavity, pilot overflow cavity, pilot action cavity, pilot oil inlet cavity. The invention can accurately control the speed of load release, and can realize zero-leakage locking. Under the condition of load rise and large flow rate, the pressure drop on the load control valve is small, which can effectively reduce the energy consumption loss of the system, has good reliability, realizes effective buffering, and ensures system security.

Description

technical field [0001] The invention relates to a hydraulic control element, in particular to a load control valve which integrates a large flow relief function into a main valve core. Background technique [0002] In the construction of construction machinery, there are often overloaded conditions. In hydraulic circuits with excess loads, load control valves are generally required to control the speed of load release. [0003] When heavy machinery such as piling equipment, hoisting equipment, etc. are on the car and turning around, there will be a large pressure shock when braking. In order to protect the hydraulic actuator from being damaged by high pressure in the event of expansion and boost, the load control valve generally needs to be separately installed with a relief valve for buffering. [0004] The traditional load control valve generally adopts the main spool designed to control the load flow and the main spool to complete the large flow relief function, resultin...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the disadvantages of the traditional load control valve with overflow function in the background technology that there are many parts, complex structure, and large volume, the purpose of the present invention is to provide a load control valve that integrates a large flow overflow function into the main valve core. The valve can not only accurately and stably control the load drop speed under the over load, but also integrates the large flow relief function of the pilot relief valve on the main spool of the load control valve, so that the structure of the valve Simple, compact and highly reliable

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