Screw-in Cartridge Balance Valve

Abstract

The invention discloses a threaded cartridge type balance valve. The threaded cartridge type balance valve comprises a valve body, a valve seat, a main valve core, a pilot valve core and a pilot mechanism, wherein the valve seat and the valve body are connected and a first communicating channel is formed on the valve seat and the valve body; one extending end of the valve seat is supported against the pilot mechanism, and a second channel is formed on the pvalve seat; a throttling groove, a first hole and a second hole are formed in the main valve core; the main valve core is arranged in the valve seat in a sliding manner and divides a valve seat cavity into a cavity H, a cavity I and a cavity J; one end of the second hole communicates with the cavity H; the other end of the second hole communicates with an inner cavity of the main valve core; one end of the first hole communicates with the second hole; one end of the pilot valve core is arranged in the inner cavity of the main valve core in a sliding manner; the other end of the pilot valve core is connected with the pilot mechanism; and a throttling groove, an axial pilot valve core cavity and throttling holes communicating with the pilot valve core cavity are formed in the pilot valve core. According to the balance valve, the opening degree of the valve core of the balance valve can be stably controlled, and the interference from a load is avoided.

Description

technical field [0001] The invention relates to the technical field of control valves, in particular to a threaded plug-in balance valve that stabilizes pressure fluctuations when the load drops. 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. 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. For example, the invention patent titled "balance valve" in patent No. CN 103104565 provides a plug-in balance valve. Bu...

AI Technical Summary

Problems solved by technology

But there are multiple deficiencies and defects in this balance valve: 1) the pilot spool of the balance valve in this invention is a steel ball. In the control of the small opening of the balance valve, very precise pilot pressure control is needed to realize the slow change of the flow Avoid sudden opening shock of balancing valve

This is difficult to implement in general hydraulic systems

2) The opening of the main spool of the balance valve is determined by the load pressure and the control pressure, so the change of the load pressure will cause the opening of the main spool to change, which in turn will cause the flow to change and cause the main engine to shake

3) The balance valve is an integral structure. When the installation torque is too large or the coaxiality error of the socket processing is large, the deformation of the valve body will be directly transmitted to the balance valve spool and control piston, causing the valve to be stuck and affecting the use. reliability

4) The diameter of the valve sleeve body of the balance valve is consistent, and the sealing ring is easily damaged during installation, resulting in internal leakage and causing hidden dangers to the safety of the main engine

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