ADJUSTABLE PILOT-ACTUATED VALVE AND HYDRAULIC SYSTEM COMPRISING SUCH A VALVE

摘要

An adjustable pilot-actuated valve (230) is provided. The adjustable pilot-actuated valve (230) comprises a housing (331) forming a valve chamber (332), a first piston chamber (338), and a second piston chamber (340). The adjustable pilot-actuated valve (230) further includes a valve spool (333) movable within the valve chamber (332). A first piston (334) is movable within the first piston chamber (338) and includes a first side (334a) and a second side (334b) with the second side (334b) coupled to the valve spool (333). A second piston (335) is movable within the second piston chamber (340) and includes a first side (335a) and a second side (335b) with the second side (335b) coupled to the valve spool (333). The adjustable pilot-actuated valve (230) further includes a first pilot port (234) formed in the housing (331) to receive a first pilot pressure and is in fluid communication with the first side (334a) of the first piston (334) and a second pilot port (235) formed in the housing (331) to receive a second pilot pressure and is in fluid communication with the first side (335a) of the first piston (335). A bias port (236) is formed in the housing (333) to receive a bias pressure and is in fluid communication with the second side (334b) of the first piston (334).