Hydraulic valve unit and work machine using the hydraulic valve unit

Abstract

Provided is, as an operating mechanism for adjusting a biasing spring from outside a valve block, a mechanism that achieves stable flow rate adjustment while avoiding a structure that generates backlash. The operating mechanism includes: a spool 40a configured to adjust a flow rate of an oil passage disposed in a valve block 30; a solenoid 5 configured to move the spool 40a; a biasing spring 50 biasing the spool 40a in such a direction as to return the spool 40a to an initial position thereof, at least one initial pressure adjustment mechanism 6 configured to adjust a biasing force of the biasing spring 50. The at least one initial pressure adjustment mechanism 6 includes: a spring bearing member 51; an operating body 60 including an operation input portion 61 operable from outside the valve block 30 and an operation output portion 62 located inside the valve block 30 and in contact with the spring bearing member 51, and the at least one initial pressure adjustment mechanism 6 is configured to adjust the biasing force in response to the operation input portion 61 being operated to move the spring bearing member 51 in first directions in which the spool moves.

Dependencies are inferred from the claim text.