Dual capacity thermal expansion valve

Details Dual capacity thermal expansion valve Dual capacity thermal expansion valve

1992-12-18

1994-01-11

Tanner, Harry B.

Automatic temperature and humidity regulation

Thermostatic

With pressure control

62212, 62225, F25B 4104

Patent

active

052773647

ABSTRACT:
This expansion valve (10 ) can be used for a refrigeration system (1) having a compressor (2), an evaporator (3) and a condenser (4). The valve (10) comprises a body (12) including an inlet passage (26), an outlet passage (38), a piston passage (28) defining a piston port (30) and valve chamber (32), the piston passage (28) defining a piston chamber (46) communicating with valve chamber (32). A piston (40) is movably mounted in the piston passage (28) and selectively controls flow through the piston port (30), the piston (40) having an interior passage (60) communicating with the inlet passage (26) and having a pin port (62) communicating with the valve chamber (32), the piston (40) having a biasing spring (52) biasing the piston (40) into a closed position. A valve pin (70) is movably mounted in the valve chamber (32) and controls flow through the valve pin port (62), the valve pin (70) having a spring (74) biasing the pin (70) into the closed position. A temperature responsive diaphragm assembly (18) including a bulb (84) responsive to the outlet temperature of the evaporator (3) includes a diaphragm (82) connected to the valve pin (70) by pushrods (90) tending to move the pin (70) into an open position during normal load conditions and selectively connected to piston (40) tending to move the piston (40) into an open position during overload conditions to increase refrigerant flow through the valve (10).

REFERENCES:
patent: 3252297 (1966-05-01), Leimbach et al.
patent: 3699778 (1972-10-01), Orth
patent: 4095742 (1978-06-01), Schumacher
patent: 5177972 (1993-01-01), Sillato et al.

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