Pressostat for pressure sensitive activation

Details Pressostat for pressure sensitive activation Pressostat for pressure sensitive activation

1983-10-20

1989-04-18

Garrett, Robert E.

Expansible chamber devices

Plural flexible wall working members

92 64, 92 97, F01B 1900, F16J 300

Patent

active

048216267

ABSTRACT:
A pressostat comprises an operating pressure chamber (4) which is limited by its housing (1) and by an operating membrane (5) or the like including a pressure surface for an output adjustment member (3), at least one spring counteracting the pressure (P) in the operating pressure chamber (4), a switch member (2) which responds when a limit pressure value is exceeded in said working pressure chamber (4), and an enclosed protective chamber (6) arranged concentrically to the working pressure chamber (4) limited by the housing (1), the operating membrane (5) and a protective membrane (7) or the like including pressure surface for the output adjustment member (3). In order, if a fracture of the operating membrane takes place, to ensure switch-off at a substantially lower limit pressure value, there is a first spring (10) counteracting the pressure (P) in the operating pressure chamber (4) arranged outside the operating pressure chamber (4) and the protective chamber (6), and a second spring (9) counteracting the pressure (P) in the operating pressure chamber (4) is arranged within the operating pressure chamber (4), and the pressure surfaces of the two membranes (5, 7) are detachably interconnected via an intermediate member (8) which is firmly connected with one of said pressure surfaces.

REFERENCES:
patent: 729926 (1903-06-01), Fulton
patent: 2659310 (1953-11-01), Ryba
patent: 2983257 (1961-05-01), Euga
patent: 3442180 (1969-05-01), Babic
patent: 3766834 (1973-10-01), Kraemer
patent: 4083290 (1978-04-01), Andres

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