Refrigeration – Reversible – i.e. – heat pump
Patent
1992-03-31
1993-10-12
Wayner, William E.
Refrigeration
Reversible, i.e., heat pump
236 92B, 137539, F25B 1300
Patent
active
052514595
ABSTRACT:
A reversible flow thermal expansion valve for use in a heat system is disclosed wherein the thermal expansion valve includes a valve body having a flowpath therethrough with an inlet and outlet, an expansion port within the flowpath, and an expansion valve to open and close the expansion port. An internal by-pass flow path by-passes the expansion port for reverse flow through the expansion valve. A check valve in the by-pass flow path prevents refrigerant from by-passing the expansion port during regular, forward flow through the expansion valve. The check valve has a spring to bias the check valve normally closed, and a bypass port communicating between a check valve guide path chamber and a check valve outlet in order to relieve pressure in the guide path chamber and increase the flow rate through the check valve.
REFERENCES:
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patent: 4964567 (1990-10-01), Heffner
Grass Thomas
Haul Robert W.
Emerson Electric Co.
Wayner William E.
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