A balance valve with built-in cushioning function

Abstract

The invention discloses a balance valve internally provided with a buffering valve. The balance valve comprises a main valve body, a main valve element, a first valve seat, a second valve seat, a first elastic piece, a second elastic piece and a plug-in mounted valve body. The first valve seat is fixedly arranged in the main valve body. The main valve element is in sliding fit with the first valve seat and the main valve body, and an inner cavity of the main valve body is divided into a first cavity, a second cavity and a control cavity. The second valve seat and the second elastic piece are arranged in the second cavity. When oil enters an oil opening V, oil liquid pushes the second valve seat open and flows towards an oil opening C through a first through hole. The first elastic piece is installed in the plug-in mounted valve body which is fixedly connected with the main valve body. The first elastic piece is used for connecting a steel ball into a runner opening of a first runner hole in the main valve element in a pressing manner through a spring seat. When the oil enters an oil opening X and pushes the main valve element to move in the first spring piece compression direction, the oil liquid of the oil opening C can flow towards the oil opening V through multiple grooves of the main valve element. The balance valve internally provided with the buffering valve is easy to machine and capable of well controlling the impact pressure.

Description

technical field [0001] The invention relates to the technical field of control valves, in particular to a balance valve with a built-in buffer valve that can accurately control the speed of load release and can well control the impact pressure. Background technique [0002] In modern construction machinery, construction machinery and other mechanical equipment, a large number of lifting hydraulic circuits are used. Among them, the balance valve is the key hydraulic component that controls the operation of the oil cylinder in the lifting circuit. The performance of the balance valve directly affects the performance of the main engine. The existing hydraulic balance valve generally has such a shortcoming: when the load is lowered, due to the characteristics of sudden changes in the flow area of ​​the valve port of the hydraulic balance valve, it will cause low-frequency jitter and impact on the load, resulting in system instability and affecting the overall performance. The sa...

AI Technical Summary

Problems solved by technology

The existing hydraulic balance valve generally has such a shortcoming: when the load is lowered, due to the characteristics of sudden changes in the flow area of ​​the valve port of the hydraulic balance valve, it will cause low-frequency jitter and impact on the load, resulting in system instability and affecting the overall performance. The safety and reliability of the machine; and during the working process of the oil cylinder, because the balance valve cannot buffer the pressure peak generated by the load impact in time, it also causes great harm to the hydraulic device.

In practical application, due to the many matching components of the spool and the sealing ring at the tail, the overall friction force is large, and the opening of the spool has a certain delay, which causes the actual peak pressure in the system to be greater than the set pressure of the spring.

For example, the maximum pressure set by the spring is 20MPa. In actual application, due to the delay in opening of the valve core, the peak pressure can reach 35-40MPa, which will cause certain harm to the safety of the hydraulic device.

[0006] (3) When the load rises, falls, and safety overflow passes through the same valve port, that is, the valve core and valve seat forming this valve port must be opened and closed once each time it rises, falls, and safety overflow, so that It will cause the valve core or valve seat to be used too frequently, thus shortening the service life

Images