A plug-in balance valve

Abstract

The invention discloses a plug-in type balance valve. The plug-in type balance valve comprises a valve body, a main valve element, a first valve seat, a second valve seat, a valve pocket, a first elastic part and a second elastic part. The first valve seat is fixedly arranged in the valve body, and the main valve element is in sliding fit with the first valve seat and the valve pocket. Oil pushes open the second valve seat when the oil flows into a V oil port, and the oil flows to a C oil port through a first through hole. The first elastic part is installed in the valve body, the valve body and the valve pocket are fixedly connected, and multiple arc-shaped grooves are formed in the circumferential face of the valve element in the axial direction. When the oil flowing into an X oil port pushes the main valve element to move in the direction of compressing the first elastic part, the open area of the oil, flowing to the V oil port through the arc-shaped grooves, at the C oil port is gradually increased. The plug-in type balance valve is simple in structure and low in manufacturing cost, and the load descending speed can be precisely controlled without affecting the ascending speed.

Description

technical field [0001] The invention relates to the technical field of control valves, in particular to a plug-in balance valve applied in a hydraulic circuit. 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 a key hydraulic component that controls the hydraulic motor in the lifting circuit. The performance of the balance valve directly affects the performance of the main engine. . [0003] Existing balance valves are divided into plate balance valves and cartridge balance valves according to the connection mode. In order to reduce the installation space and improve system reliability in crane telescopic cylinders, cartridge balance valves are generally used. The patent No. ZL01139273.8 titled "A Balance Valve" provides a plug-in balance valve. It includes a main valve and a pilot valve. Each of the above-mentioned va...

AI Technical Summary

Problems solved by technology

This puts forward high requirements on the heat treatment and material of the main valve core, which increases the processing cost

[0007] (3) The pilot spool of the balance valve is located inside the main spool. In order to reduce the flow resistance, it is necessary to increase the size of the pilot spool, and the size of the main spool and valve sleeve must also be increased successively, so that the balance valve Overall size is too large

[0009] (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, the throttling effect is not needed when the load is raised, 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

[0010] (2) When the load rises and falls, it passes through the same valve port, that is, the valve core and valve seat forming the valve port must be opened and closed once every time they rise and fall, which will cause the valve core or valve seat to use The frequency is too high, which reduces the service life

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