Plug-in mounting type balance valve

Abstract

A plug-in mounting type balance valve comprises a valve body, an end cover, a plug, a valve core, a valve seat and a piston, wherein a third oil port is formed in the rear end of the plug, a filter screen and a damper are arranged at the position of the third oil port, the valve seat is arranged in a first chamber of the valve body and is located between a first oil port and a second oil port, the front section of the valve core is arranged in the end cover in a sliding fit mode, the rear section of the valve core is arranged in a through hole of the valve seat in a matched mode, the valve core is provided with an inner cavity which is through along the axial direction, a steel ball matched with the inner cavity of the valve core is arranged in the valve core, a boss used for axial positioning of the steel ball is arranged in the inner cavity of the valve core, a first spring which abuts against the steel ball is arranged in the inner cavity of the valve core, the other end of the first spring is arranged in the end cover in an abutting mode, the piston is arranged in a second chamber in a sliding fit mode, an step end of a piston rod penetrates through a room wall between the first chamber and the second chamber and is arranged in the inner cavity of the valve core, the rear end of the piston is provided with a one-way throttling gear, and the diameter of the outer circumference of the valve body decreases from the end cover end to the plug end gradually to form a step shape. The balance valve is simple in structure, compact in structure, and stable in working.

Description

technical field [0001] The invention relates to a hydraulic valve, 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. Patent No. ZL01139273.8 The invention patent titled "A Balance Valve" provides a cartridge-type balance valve. It includes a main valve and a pilot valve. Each of the above-mentio...

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. Since 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

The diameter of the hydraulic cylinder is fixed. If the size of the balance valve is too large, the machining allowance of the insertion hole on the hydraulic cylinder will be too small, which will cause certain difficulties in processing.

[0008] 4. The diameter of the valve sleeve body of the balance valve is the same, and it is easy to cause damage to the sealing ring during installation, resulting in internal leakage and causing hidden dangers to the safety of the main engine

[0009] 5. There are few damping links inside the balance valve, and the stability is poor under the interference of external conditions, and it is easy to produce jitter

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