PRESSURE COMPENSATION VALVE

摘要

A pressure compensation valve comprises a valve body (1), a valve sleeve (2) fixedly mounted on the valve body (1), and a spool (3) disposed in a valve hole (4e) of the valve body (1) and capable of moving. The valve sleeve (2) and the spool (3) are sequentially provided with a piston (4) and a return spring (5). The piston (4) is placed on an inner hole of the valve sleeve (2). The return spring (5) is internally provided with a pressure chamber (0c) formed between the piston (4) and the valve sleeve (2), and acts on with a transverse end surface of the piston (4). A check valve (6) only allowing a single-direction flow to an LS flow channel (7) is disposed in an oil feeding chamber (4a) of the valve body (1). The spool (3) establishes or blocks a connection between the oil feeding chamber (4a) and an oil discharging chamber (4d). The pressure compensation valve changes a pressure compensation feature, that is, changes an effective pressure acting surface (A1); for example, if the effective pressure acting surface (A1) is increased, force pushing the piston is increased with respect to blocking, and the pressure in the oil feeding chamber (4a) is increased, thereby making a pressurized liquid difficult to flow; on the contrary, if the effective pressure acting surface (A1) is decreased, the pressurized liquid becomes easy to flow. The structure is simple, requires low cost, and increases the utilization rate of a product.