Thermostatic expansion valve for low refrigerant flow rates

Details Thermostatic expansion valve for low refrigerant flow rates Thermostatic expansion valve for low refrigerant flow rates

1990-08-28

1991-06-25

Rosenthal, Arnold

Valves and valve actuation

With material guide or restrictor

Movable or resilient guide or restrictor

251337, 62225, F16K 152, F16K 4704

Patent

active

050260227

ABSTRACT:
A thermostatic expansion valve adapted for refrigerant flow at low flow rates includes a body (12) with an inlet (14) and an outlet (16). The body includes an orifice (24) and a cylindrical chamber (20). A movable metering pin (26) includes a needle head portion (28) which is movable into said orifice. A power element assembly (46) is operative to move the metering pin to enable refrigerant flow through the orifice. The metering pin also includes a cylindrical body portion (30) positioned in the cylindrical chamber of the body. An outer wall of the cylindrical body portion of the metering pin is disposed from an inner wall of the cylindrical chamber to form an accurately sized yet very small opening. The valve enables accurate superheat control at low flow rates through the valve.

REFERENCES:
patent: 1510802 (1924-10-01), Scott
patent: 2231163 (1941-02-01), Johnson
patent: 2298253 (1942-10-01), Dillman et al.
patent: 2452956 (1948-11-01), Robins

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