Device for monitoring the valve lift of a diaphragm valve
AssigneeGeorg Fischer Rohrleitungssysteme AG
InventorMartin Heiniger
Life of this patent
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Abstract
Device for monitoring the valve lift of a pneumatically or hydraulically driven valve, the valve body of which is actuated by a pressure spindle (16), specificelly a diaphragm valve where a drive spindle (20) and pressure spindle (16) are effectively connected. Two trip cams (38, 40) separated by the distance (a) are mounted on the drive spindle (20) to activate two limit switches (34,35) that act as position indicators for the two valve positions, whereby one trip cam (38, 40) is assigned to one limit switch (34, 35). The automatic positioning of the trip cams (38, 40) during the initial actuation of the valve is accomplished by a crossbar (36) that acts as a driver and is located between trip cams (38, 40). The trip cams (38,40) are mounted on drive spindle (20) by moveable clamps.
Claims8
A device for monitoring the valve lift of a pneumatically or hydraulically driven valve having a valve body which is actuated by a pressure spindle, specifically a diaphragm valve, where a drive spindle and a pressure spindle coaxial with said drive spindle are connected by a connector, and a trip cam attached to the drive spindle is used to activate two limit switches that act as position indicators for the valve positions with the distinguishing feature that two trip cams are movably mounted on the drive spindle and are moved to a desired spaced apart position by a crossbar that is located between said trip cams and which acts as a driver, and that one trip cam is assigned to each limit switch.
Dependencies are inferred from the claim text.