Balance valve

Abstract

The invention discloses a balance valve. The balance valve comprises a valve seat, a valve housing, a valve sleeve, a balance valve element, a one-way valve element, a retaining ring, a first spring,a compensating plunger, a second spring and a reverse-proportional overflow valve. The balance valve disclosed by the embodiment of the invention is simple to machine, prevents abrupt changes in an open area, can quickly achieve a safety protection function and saves energy.

Description

technical field [0001] The invention relates to a valve assembly for a hydraulic device, in particular to a balance valve. 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. [0003] 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 val...

AI Technical Summary

Problems solved by technology

[0003] 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.

[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) Milling grooves on the cone valve core, the processing is complicated and the efficiency is low, so the production cost is high

In actual application, because the valve core has many matching components, and the tail is equipped with a sealing ring, the overall friction force is large, and the opening of the valve core 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 practical applications, due to the delayed opening of the valve core, the peak pressure can reach 35-40MPa, which will cause certain harm to the safety of the hydraulic device.

[0007] (4) 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 overflows. In this case, the frequency of use of the valve core or valve seat is high, which shortens the service life

[0008] (5) The spring setting pressure of the balance valve is constant, and the reverse opening pressure of the balance valve is fixed for different load conditions, so that the control pressure of the balance valve needs to be opened for the working condition with a lower load It is the same as the working condition with high load, which will cause a large capacity loss and not save energy

Images