Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1998-08-13
1999-12-28
Douglas, Steven O.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
251 636, 251 612, 251331, 251 615, F61K 31143, F61K 100
Patent
active
060070455
ABSTRACT:
In a pneumatically or hydraulically driven membrane valve assembly with a pressure piece actuated by a pressure spindle, a membrane support member designed as a coupling member engages the pressure piece. The membrane member is connected to the membrane support member by means of a releasable coupling extending through the pressure piece. The pressure spindle can be coupled to the membrane support member by a releasable ridge/groove-connection. Thereby, all types of medium membranes can be coupled even at a later stage. The valve assembly has a top housing portion, an intermediate housing piece and a bottom housing portion. The top housing portion is connected to the intermediate piece by screwing it thereon. Both the top portion and the intermediate piece have circumferential stop faces engaging each other in the screwed on state and having at least partially differing pitch values for creating a predetermined bias in the thread. The mutual rotational movement is limited by a step shaped end stop member constituted by the afore mentioned circumferential stop faces to avoid an overtightening.
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Bannwarth Walter
Heiniger Martin
Douglas Steven O.
Georg Fischer Rohrleitungssysteme AG
Nguyen Tuan
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