Patent ID: 8336849
Filing Date: 2012-12-25
Classification: F16K

Abstract:
1. A valve for controlling a flow of a pressurized working fluid, the valve comprising: a housing defining a bore having an inlet and extending along a longitudinal axis; a head attached to said housing and defining a head passage having an outlet; a piston disposed within said bore and defining a piston passage through said piston along said longitudinal axis for communicating the pressurized working fluid therethrough, said piston moveable between an open position allowing fluid communication between said inlet and said outlet, and a closed position preventing fluid communication between said inlet and said outlet; said housing defining an equalizing chamber in fluid communication with said head passage and configured for communicating a fluid pressure between said head passage and said equalizing chamber to dampen movement of said piston between said closed position and said open position; wherein said housing and said piston cooperate together to define a first pressure chamber and a second pressure chamber with said first pressure chamber configured for receiving the pressurized working fluid from one of said bore and said head passage to urge said piston into said closed position and said second pressure chamber configured for receiving the pressurized working fluid from one of said bore and said head passage to urge said piston into said open position; and a first piston seal configured for sealing said first pressure chamber from said bore and a second piston seal configured for sealing said second pressure chamber from said bore; wherein said piston includes a first portion defining a first diameter and an annular collar portion extending radially outward from said longitudinal axis at an approximate midsection of said first portion to define a second diameter greater than said first diameter.