Normally closed pneumatic air valve

Details Normally closed pneumatic air valve Normally closed pneumatic air valve

1987-10-19

1988-06-07

Michalsky, Gerald A.

Fluid handling

Larner-johnson type valves; i.e., telescoping internal valve...

251 612, F16K 31126

Patent

active

047490012

ABSTRACT:
A normally closed pneumatically actuated air valve for use in a variable air volume air distribution system has a unitary inlet section which supports a damper assembly and actuator through a support grid disposed in the inlet section. The damper assembly is mounted for axial movement, on a fixed spindle and guide piston, under the impetus of the expansion of a pressure chamber defined by a portion of the damper assembly and a diaphragm which conformably surrounds the guide piston. A biasing spring acts on a surface of the fixed guide piston and on the damper assembly to bias the damper assembly toward a seating surface of the inlet section.

REFERENCES:
patent: 2821343 (1958-01-01), Payne
patent: 2882008 (1959-04-01), Giauque
patent: 3432139 (1969-03-01), Jentoft
patent: 3974859 (1976-08-01), McNabney
patent: 4082114 (1978-04-01), Hantke et al.
patent: 4177970 (1979-11-01), Ring, Jr.
patent: 4305418 (1981-12-01), Jensen et al.

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