Patent ID: 9273702
Filing Date: 2016-03-01
CPC Classification: F15B,F16K,Y10T

Claim Text:
1. A counterbalance valve, comprising: a valve body having: a piston positioned within the longitudinal chamber, the piston being longitudinally slidable along the longitudinal axis between an open position and a closed position, wherein in the open position a fluid passageway is established between the load port and the valve port, and in the closed position the load port is sealingly isolated from the valve port; a sleeve disposed within the longitudinal chamber, the sleeve being slidable between a minimum position and a maximum position; a spring disposed within the sleeve; a ball holder disposed within the sleeve, the ball holder compressing the spring within the sleeve; a ball disposed between the ball holder and the piston; the sleeve, the spring, the ball holder and the ball collectively biasing the piston into the closed position; a grounding spring disposed between an exterior of the sleeve and an interior of the valve body configured to bias the sleeve into the minimum position.