Claims
- 1. A thermostatic expansion valve assembly for a refrigeration installation of the type having condenser and evaporator units, comprising, a housing, a condenser inlet port and an evaporator outlet port in said housing, an operating unit having a chamber pressure responsive to the superheat temperature of said evaporator unit, valve means between said ports including a piston and a cylinder with said piston being reciprocally mounted in said cylinder, a central opening in said piston forming a movable valve seat carried by said piston, said operating unit including a centrally disposed rod extending through said piston opening, said valve means including a closure member attached to the lower end of said rod which is cooperable with said valve seat, spring means biasing said piston in an upstream valve opening direction, said piston pressure biasable by condenser pressure in a downstream valve closing direction, said operating unit being operable to move said rod and closure member thereof in a valve opening direction, said spring means having a characteristic curve relative to a range of values of said condenser pressure to maintain a flow quantity through said valve means over said range of condenser pressure values which corresponds only to said operating unit chamber pressure.
Parent Case Info
This is a continuation application of Ser. No. 495,384, filed Aug. 7, 1974, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
670,751 |
Sep 1963 |
CA |
Continuations (1)
|
Number |
Date |
Country |
Parent |
495384 |
Aug 1974 |
|