Expansion valve combined with a solenoid valve

Details Expansion valve combined with a solenoid valve Expansion valve combined with a solenoid valve

1994-11-29

1996-12-31

Tapolcai, William E.

Automatic temperature and humidity regulation

Thermostatic

With pressure control

62225, 137614, F25B 4104

Patent

active

055885900

ABSTRACT:
This invention provides an expansion valve combined with a solenoid valve which prevents a water hammer phenomenon from occurring when a refrigerant passage is opened and closed by the solenoid valve. Refrigerant passages (P1, P2) are formed in a valve body (1) between a primary port (1a) and a secondary port (1b). The solenoid valve (V) attached to the valve body (1) opens and closes the refrigerant passages (P1, P2) in their intermediate portion. An expansion valve disk (6)--which is moved by the action of a diaphragm (8) that defines an outer pressure chamber (R2) communicating to a temperature sensing cylinder (E) and an inner pressure chamber (R1)--is brought into and out of engagement with a valve seat (S1) formed on the primary port (1a) side of the refrigerant passage (P1). The secondary port (1b) side and the inner pressure chamber (R1) are communicated via an inner pressure equalizing hole (15) formed in the valve body (1).

REFERENCES:
patent: 2841174 (1958-07-01), Frye
patent: 3699778 (1972-10-01), Orth
patent: 4065939 (1978-01-01), Thornbery et al.
patent: 4112704 (1978-09-01), Kaneko
patent: 4925196 (1990-05-01), Green et al.
patent: 4926652 (1990-05-01), Kitamoto
patent: 5251459 (1993-10-01), Grass et al.

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