Pneumatic switching device, e.g., for safeguarding against overp

Details Pneumatic switching device, e.g., for safeguarding against overp Pneumatic switching device, e.g., for safeguarding against overp

1985-04-19

1986-12-23

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762566, F15B 13042

Patent

active

046306455

ABSTRACT:
Pneumatic switching devices do not constitute a danger in explosive surroundings contrary to electrical switching devices with which sparking may occur. Known pneumatic devices have the disadvantage of a long actuation path, whereby they can arrive at a so-called "cutting" position. Moreover, they are not suitable for actuation by the very sensitive pressure pick ups constituted by membrane pistons. Also the known pneumatic switching devices have large dimensions. The invention removes said disadvantages in that the switching device has a piston provided in a housing, a switching chamber and a pressure chamber being formed between the housing bore wall and a narrowed piston portion.

REFERENCES:
patent: 3670771 (1972-06-01), Dewberry
patent: 3776277 (1973-12-01), Nagashima
patent: 3797525 (1974-03-01), Lieser
patent: 3805837 (1974-04-01), Stampfli
patent: 3807448 (1974-04-01), Hadden
patent: 4066101 (1978-01-01), De Fries
patent: 4150687 (1979-04-01), Blanton
patent: 4237931 (1980-12-01), Rafaely

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