Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1990-02-12
1991-04-16
Michalsky, Gerald A.
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
137269, 137556, 137557, 13762527, F16K 1702, F16K 3700
Patent
active
050074474
ABSTRACT:
A re-settable apparatus for producing a signal for triggering off a safety measure on an installation with at least a pneumatic feed in response to a drop in the pneumatic feed pressure comprises a body providing an internal chamber connected by a first duct to a first orifice for connection thereof to the pneumatic feed, by a second duct to at least one member for outputting a signal for control of the triggering effect, and by a third duct to an exhaust orifice. The first duct opens into the chamber through a first seat and the third duct opens into the chamber through a second seat of larger diameter than the first seat. A valve member is mounted in the chamber movably between a first position in which it is applied against the first seat and a second position in which it is applied against the second seat, while a resilient return member between the body and the valve member urges the valve member towards its first position with a force of given intensity. A voluntary re-setting control arrangement comprises a thrust member disposed in opposite relationship to the resilient return member with respect to the valve member between the latter and an actuating member which is accessible from the exterior of the body, the thrust member being displaceable in the body with a movement of an amplitude which is at least equal to the value of the displacement of the valve member when it moves from one of the seats to the other.
REFERENCES:
patent: 2638108 (1953-05-01), Williams et al.
patent: 3166358 (1965-01-01), Valentine
patent: 3610284 (1971-10-01), Spencer
patent: 3769996 (1973-11-01), Holbrook et al.
patent: 3818943 (1974-06-01), Bouteille
patent: 3820567 (1974-06-01), Bouteille
patent: 4004610 (1977-01-01), Theriot
patent: 4508014 (1985-04-01), Shoff
Astier Marc
Cartigny Marcel
Mery Bernard
Penitot Gerard
Roynard Joel
Michalsky Gerald A.
Quiet S.A.
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