Patent ID: 8262058

Claim:
A valve comprising: a valve body comprising: a cartridge bore comprising a piston bore, an input counterbore, an output counterbore, and a bearing sleeve counterbore, said input counterbore and said output counterbore meeting at a sealing ledge; an input reentrant bore which intersects said input counterbore; an output reentrant bore which intersects said output counterbore; and a pilot reentrant bore which intersects said piston bore; and a counterbalance reentrant bore, said counterbalance reentrant bore intersecting said pilot reentrant bore and said output reentrant bore and said counterbalance reentrant bore being free of obstruction between said pilot reentrant bore and said output reentrant bore; a piston cartridge disposed at least partially within said cartridge bore, said piston cartridge comprising: a longitudinal piston rod; a first piston head secured to one end of said piston rod; a second piston head secured to a second end of said piston rod, said second piston head disposed in said piston bore; a poppet member slidably disposed on said piston rod within said output counterbore; and a poppet bias spring located between said poppet member and said first piston head biasing said poppet member in a poppet bias direction against said sealing ledge; an end cap spring acting against said first piston head, biasing said piston rod in said poppet bias direction; and a bearing sleeve inserted into said bearing counterbore, extending into said output counterbore, wherein said first piston head is disposed in said bearing sleeve and said second piston head is disposed in said piston bore.