Valves and valve actuation – Rotary valves – Ball valve
Patent
1978-05-04
1981-03-24
Makay, Albert J.
Valves and valve actuation
Rotary valves
Ball valve
49 31, 251134, 181224, F24F 700
Patent
active
042573190
ABSTRACT:
Ventilating device for rooms having air passage apertures and closure means movable by an electric drive between an open position and a closed position, a noxious gas sensor and electrical control means responsive to the gas sensor for operating the electric drive so that the closure means is moved to the open position when the gas sensor senses noxious gas concentration in the room above a predetermined level.
REFERENCES:
patent: 2566784 (1951-09-01), Waff
patent: 3011718 (1961-12-01), Joerren et al.
patent: 3282557 (1966-11-01), Capps
Bennett Henry
Blodgett Gerry A.
Blodgett Norman S.
Makay Albert J.
Siegenia-Frank KG
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