Georg Fischer Rohrleitungssysteme Ag

Georg Fischer Management Ag

Walter Bannwarth

Martin Heiniger

Juergen Stumpp

Joerg Hunnekuhl

Christian Hunnekuhl

Jürgen Stumpp

Jörg Hunnekuhl

Diaphragm valve () comprising a housing upper part (), which receives an actuating device () for actuating the valve (), and a housing lower part (), which has a receiving region () for receiving a diaphragm (), wherein in the housing lower part () below the diaphragm () a central region forming a flow channel () is designed, wherein the cross-sectional surface of the flow channel () in the central region () of the housing lower part () is constant when the valve () is in the open state.

Diaphragm valve

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.

Membrane valve assembly

In a pneumatically or hydraulically actuated valve, in particular, a diaphragm valve, that comprises a valve body that can be actuated via a coupling rod (14), the coupling rod (14) is held in the corresponding position for adjusting a minimum flow cross section via an adjustable limit stop. The coupling rod (14) passes through the housing cover (12) of a valve housing (10) and serves as an indicator for the valve position. The coupling rod (14) is guided in a sliding fashion inside a sleeve (16), with said sleeve (16) engaging with a threaded bushing (20) that is connected with the housing cover (12) in a fixed manner via an external thread (18), and with said sleeve being able to be displaced in its axial direction (z) by means of a screw-turning motion. A limit stop part (22) that can be brought into contact with the face side (26) of the sleeve (16) situated opposite the valve body is fixed on the free end of the coupling rod (14). The limit stop part (22) is preferably fixed on the coupling rod (14) such that its position can be adjusted. Due to the possibility of adjusting the sleeve (16) as well as the limit stop part (22) on the coupling rod (14), it is possible to adjust the open as well as the closed actuating position of the valve and actuate the valve between a preadjusted minimum and a preadjusted maximum flow cross section.

Growing community of inventors

Lauchringen, Germany

Walter Bannwarth