Balanced thermostatic expansion valve for refrigeration systems
In a refrigeration system having a compressor, condenser and evaporator operatively interconnected, a thermostatic expansion valve is described comprising: (a) a valve body, an inlet chamber, an outlet chamber and means for separating the inlet chamber from the outlet chamber, an inlet connecting the inlet chamber with a refrigerant line connected to the refrigeration system high pressure side, an outlet connecting the outlet chamber to a refrigeratnt line connected to the evaporator, (b) means for controlling the flow of the refrigerant through the expansion valve separating means, (c) means in the separating means for further defining a valve port which operatively receives the flow controlling means, (d) a biasing member for biasing the flow controlling means towards a closed position tending to close the valve port thereby reducing the flow of the refrigerant through the valve port, (e) a flexible motor element carried by the valve body and operatively connected to the flow controlling means for moving the flow controlling means between an open position and a closed position thereby increasing and decreasing the flow of the refrigerant through the valve port, (f) means for sensing a temperature at an evaporator outlet and subjecting one side of the flexible motor element to a pressure that is a function of the evaporator outlet temperature, (g) first communicating means for subjecting another opposing side of the flexible motor element to an inlet chamber pressure, and (h) a second communicating means intermediate the flexible motor element and the biasing member for communicating a pressure difference to the biasing member.
- Assignee:
- Sporlan Valve Co., St. Louis, MO
- Patent Number(s):
- US 4750334
- OSTI ID:
- 7095117
- Resource Relation:
- Patent File Date: Filed date 26 Mar 1987
- Country of Publication:
- United States
- Language:
- English
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