Dual flow variable area expansion device for heat pump system

Details Dual flow variable area expansion device for heat pump system Dual flow variable area expansion device for heat pump system

1990-06-28

1991-08-13

Makay, Albert J.

Refrigeration

Reversible, i.e., heat pump

With flow control or compressor details

623241, 62222, 62528, 1374939, F25B 1300

Patent

active

050385798

ABSTRACT:
A flow metering device for use as an expansion valve in a heat pump system includes a body having a flow passage extending therethrough. Two pistons are moveably disposed within the flow passage. Each piston has a flow metering port extending therethrough and a bypass flow means associated therewith. A refrigerant metering rod is fixed within the flow passage and extends through both metering ports. The rod has two flow metering configurations formed thereupon, each of which cooperates with one of the pistons to define a variable area flow passage within the valve. The pistons are spring biased to closed positions when there is no flow through the valve. Flow in one direction results in metering through the variable area passage defined by one piston and its associated flow configuration and free flow through the bypass means of the other piston. Flow through the valve in the opposite direction reverses the roles of the pistons.

REFERENCES:
patent: 4341090 (1982-07-01), Ramakrishnan

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