flow balance valve

Abstract

The invention discloses a flow type balancing valve which comprises a valve body, a main valve element, a one-way valve element, a guide valve sleeve assembly, a first elastic piece and a second elastic piece. The guide valve sleeve assembly is fixedly connected with the valve body in a sleeved mode in the opposite direction, the main valve element and the one-way valve element slide oppositely in the axial direction and are arranged in the guide valve sleeve assembly, the valve body is provided with an oil opening X, the guide valve sleeve assembly forms an oil opening V and an oil opening C, and the oil opening C is communicated with an inner cavity of the one-way valve element and a liquid flow channel in the main valve element; a plurality of throttling through holes are formed in the position, close to the oil opening V, of the guide valve sleeve assembly in the radial direction; when oil enters from the oil opening V, the one-way valve is switched on, and the oil opening V is communicated with the oil opening C; when oil enters from the oil opening X, the main valve element is pushed to be compressed in the axial direction and move towards the first elastic piece, the throttling through holes of the guide valve sleeve assembly are exposed, and the through-flow area is gradually increased. The flow type balancing valve is simpler in machining, smoother in overflowing, capable of precisely controlling the load lowering speed and reliable in use.

Description

technical field [0001] The invention relates to the technical field of control valves, in particular to a flow type balance valve capable of precisely controlling the speed of load release. 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 work of the hydraulic 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. Machine safety and reliability. [0003] The patent announc...

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. Machine safety and reliability

[0004] (1) When the load is lowered and the load is raised, it passes through the same valve port, which will produce a throttling effect, but in practice, when the load rises, the throttling effect is not needed, which seriously affects the efficiency of the operation; in order to solve this problem, it is necessary to connect a valve in parallel. One-way valve, virtually increases the cost;

[0005] (2) After milling grooves and drilling small holes and inclined holes on the cone valve core, the rigidity of the valve core is greatly reduced. When the control load is lowered, it must bear a large pressure difference and rapid liquid flow impact, and the heat treatment is not good. If not, the spool is easily broken and the reliability is greatly reduced;

[0006] (3) The milling groove on the cone valve core is complicated to process and low in efficiency, so the production cost is high;

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