Patent ID: 9145978
Filing Date: 2015-09-29
Classification: F16K,Y10T

Abstract:
1. A valve assembly comprising: a valve body having spaced inlet and outlet ports separated by an intermediate valve seat in open communication with the inlet and outlet ports; a first piston reciprocal within a bore in the valve body, the piston including a valve member being adapted to sealingly mate with the valve seat; an adapter body secured to an open end of the bore in the valve body; a second piston reciprocal within a bore in the adapter body, the second piston having a portion adapted to extend into the bore in the valve body for contacting the first piston; a solenoid assembly operable to open and close a conduit connecting a source of pressurized gas to the bore in the valve body above the first piston and to the bore in the adapter body above the second piston; and a first check valve in the conduit positioned between the solenoid assembly and the bore in the adapter body above the second piston; a second check valve, the second check valve positioned in a pilot conduit above the second piston; wherein the first check valve opens and the second check valve closes when the solenoid assembly is energized; and wherein the first check valve closes and the second check valve opens when the solenoid assembly is un-energized, the second check valve adapted to close when an inlet pressure to the second check valve falls below the tension of a spring of the second check valve.