Patent ID: 7677527
Filing Date: 2010-03-16
Classification: F16K,F25B

Abstract:
1. A refrigeration valve for a refrigeration system evaporator configuration, the valve 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 reciprocable within a bore in the valve body, the piston including a valve member being adapted to sealingly mate with the valve seat, the piston including a bleed hole through a portion of the first piston providing a fluid pathway connecting the valve body outlet port to the bore in the valve body; a biasing member for normally biasing the valve member away from the valve seat; an adapter body secured to an open end of the bore in the valve body; a second piston reciprocable within a bore in the adapter body, the second piston having a portion adapted to extend into the bore in the valve body; an end cap positioned adjacent the adapter body on a side opposite the valve body; a source of high pressure gas fluidly connected at a single location to the end cap; a first conduit extending at least partially through the end cap and the adapter body, fluidly connecting the source of high pressure gas to the bore in the valve body; a second conduit extending at least partially through the end cap, fluidly connecting the source of high pressure gas to the bore in the adapter body; a first solenoid assembly attached to the end cap or the adapter and moveable to open and close the first conduit; and a second solenoid assembly attached to the end cap or the adapter and moveable to open and close the second conduit; the valve having a first position wherein the valve is fully open and the first and second conduits are closed; the valve having a second position wherein the valve is fully closed and the first conduit is open; the valve having a third position wherein the valve is partially open and the first conduit is closed and the second conduit is open, and a portion of the second piston engages the first piston to hold the first piston in the partially open position.