Patent ID: 7131453
Filing Date: 2006-11-07
Classification: F15B,Y10T

Abstract:
1. A hydraulic valve device comprising: a main valve block in which control valves, a pressure oil supply line connected to a pump, and a tank line connected to an oil tank are incorporated; and an end cover attached to a side face of said main valve block, said main valve block further comprising: an option valve disposed adjacent said end cover adapted to control the operation of an option actuator; a pressure oil supply passage which connects said option valve and said pressure oil supply line with each other; a return passage which connects said option valve and said tank line with each other; an actuator passage to which said option actuator is connected; a check valve for preventing reverse flowing of pressure oil from said pressure oil supply passage to said pressure oil supply line; a pressure oil branch passage branching from said pressure oil supply passage and provided at a front end of said pressure oil branch passage with a pressure oil branch port which is closed with said end cover; a return branch passage communicating with said tank line and provided at a front end of said return branch passage with a return branch port which is closed with said end cover; and an actuator branch passage branching from said actuator passage and provided at a front end of said actuator branch passage with an actuator branch port which is closed with said end cover.