PRESSURE LOSS REDUCING CIRCUIT FOR A WORKS MACHINE

摘要

A pressure loss reducing circuit reduces a pressure loss of oil returning from an actuator to a direction switching valve with a simple configuration while suppressing an increase in the manufacturing cost and substantially eliminating the need of an additional installation space. The pressure loss reducing circuit includes a bypass valve (16) disposed between an actuator oil path (10) and a tank oil path (14) of a direction switching valve (2), and opened and closed according to a signal from a controller (8), and moreover screwed into and attached to the direction switching valve (2) According to an operation signal of a switching spool (2a) when oil returning from an actuator (4) is caused to flow to the actuator oil path (10), the controller (8) opens the bypass valve (16) so that the actuator oil path (10) and the tank oil path (14) communicate with each other and supplies the returning oil to the switching spool (2a) and the bypass valve (16) to reduce a pressure loss.