Fail safe valve

Details Fail safe valve Fail safe valve

2006-02-14

2006-02-14

Bastianelli, John (Department: 3751)

Valves and valve actuation

Biased trip

Electrical trip actuation

C251S065000, C251S129110

Reexamination Certificate

active

06997430

ABSTRACT:
The invention concerns a fail-safe valve having a valve element, and a control motor being connected with the valve element via a driveline. It is endeavored to ensure the tightness of the refrigeration system in a simple manner. For this purpose, it is ensured that the valve element is located inside and the control motor outside a closed valve housing, that the drive line has a magnetic coupling, which acts through the housing, and that the valve element is pressure-released. In addition, a resetting device is provided that causes the valve element to be returned to a predetermined position upon the undesired cessation of control motor operation.

REFERENCES:
patent: 3842601 (1974-10-01), Borst
patent: 4090589 (1978-05-01), Fitzwater
patent: 4296912 (1981-10-01), Ruyak
patent: 4501981 (1985-02-01), Hansen
patent: 4671486 (1987-06-01), Giannini
patent: 4742989 (1988-05-01), Akagi
patent: 4757684 (1988-07-01), Wright
patent: 4915083 (1990-04-01), Hewette et al.
patent: 6129333 (2000-10-01), Ma
patent: 6769665 (2004-08-01), Silva et al.

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