Flow type balance valve provided with cushion valve

Abstract

The invention discloses a flow type balance valve provided with a cushion valve. The flow type balance valve comprises a main valve body, a main valve element, a first valve seat, a second valve seat, a first elastic part, a second elastic part and a plug-in mounting valve body, wherein the first valve seat is fixedly arranged in the main valve body; the main valve element is in easy push fit with the first valve seat and the main valve body and divides the inner cavity of the main valve body into a first cavity, a second cavity and a control cavity; the second valve seat and the second elastic part are arranged in the second cavity; when oil enters a hydraulic fluid port V, the oil pushes the second valve seat open and flows to a hydraulic fluid port C via a first through hole; the first elastic part is mounted in the plug-in mounting valve body; the plug-in mounting valve body is fixedly connected with the main valve body; the first elastic part enables a steel ball to go into a runner opening of a main runner in the main valve element in a pressure welding manner through a spring seat; and when oil entering a hydraulic fluid port X pushes the main valve element to move in the direction of compressing the first elastic part, oil of the hydraulic fluid port C flows to the hydraulic fluid port V through a plurality of through holes of the main valve element. The flow type balance valve provided with the cushion valve is simple to machine and can better control shock pressure.

Description

Technical field [0001] The invention relates to the technical field of control valves, in particular to a flow-type balance valve with a buffer valve that can accurately control the load lowering speed and well control the impact pressure. 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 oil 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 feature of sudden change in the flow area of ​​the valve port of the hydraulic balance valve, the load will produce low-frequency jitter and shock phenomena, causing system instability and affecting the whole The safety and reliability of the machine; an...

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. The safety and reliability of the machine; and during the static 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 practical application, due to the many matching components of the spool and the sealing ring at the tail, the overall friction force is large, and the opening of the spool 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 actual application, due to the delay in 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 overflow, so that It will cause the valve core or valve seat to be used too frequently, thus shortening the service life

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