Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Reexamination Certificate
2002-08-12
2004-02-17
Chambers, A. Michael (Department: 3753)
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
C137S559000, C251S267000, C251S285000
Reexamination Certificate
active
06691737
ABSTRACT:
This application claims the priority of German Patent Application Serial No. 100 06 326.8, filed Feb. 12, 2000, the subject matter of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a hand drive for opening and closing a shut-off member, and in particular to a membrane valve with a hand wheel and a threaded spindle coupled to a valve element which can be moved by the hand wheel in an axial direction.
Various valve designs are known in the art that limit movement of the valve stem. For example, CA 106 26 88 discloses a radiator valve with a housing carrying a valve stem with plate and loading spring on the valve stem above the valve plate. The valve seal can be removed without removing the valve tensioning spring. U.S. Pat. No. 5,647,397 discloses a valve which allows adjusting a minimum flow cross section via an adjustable limit stop. A coupling rod passes through the cover of the valve housing and serves as an indicator for the valve position. However, there is a need for a valve wherein the closure position of the valve element and preferably also the valve lift are limited, preferably with an element that is integrated with the valve.
SUMMARY OF THE INVENTION
It is thus an object of the present invention to provide an improved hand drive for shut-off members, obviating the afore-stated drawbacks.
According to one aspect of the invention, a hand drive for opening and closing a shut-off member, in particular a membrane valve, includes a valve element, a hand wheel and a threaded spindle coupled to the valve element, with the spindle axially moveable by the hand wheel, and a first limiter device for limiting the closure position of at least one of the threaded spindle and the valve element disposed on the hand wheel. For also limiting the valve lift of the valve element and/or the valve spindle, a second limiter device is arranged on the hand wheel.
Advantageously, the hand wheel is provided with an inside thread in which an insert provided with a radial collar is threaded so as to be adjustable in an axial direction, whereby the threaded spindle is also provided with a radial collar. The collar of the insert can axially contact the collar on the threaded spindle for limiting the closure position of the valve element.
Preferably, the insert is provided with an interior thread into which another axial displaceable insert with a radial collar is screwed. The collar of the other insert can axially contact the collar on the threaded spindle for limiting the valve lift of the valve element.
According to another embodiment of the invention, the hand wheel is provided with a covering cap for the inserts, wherein this covering cap is connected via respective n-sided flat (for example, a 12-sided flat) with each of the hand wheel and the two inserts, so as to prevent an unintentional rotation of the two inserts relative to each other or relative to the hand wheel.
Advantageously, the hand wheel is non-rotatably coupled with yet another insert, which is secured in a valve a housing and connected with the threaded spindle via a thread, wherein the hand wheel is fixed in the axial direction between the valve housing and the insert.
Advantageously, a visual indicator is fixedly attached to the threaded spindle, whereby the collar of the threaded spindle can be formed on the visual indicator.
Advantageously, the device that limits the closure position of the threaded spindle can be arranged inside the second device that limits the valve lift of the threaded spindle.
Further features and advantages of the present invention will be apparent from the following description of preferred embodiments and from the claims.
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patent: 4014514 (1977-03-01), Priese et al.
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patent: 5609185 (1997-03-01), Booth et al.
patent: 5647397 (1997-07-01), Heiniger et al.
patent: 5823509 (1998-10-01), Daniels
patent: 1 064 868 (1967-04-01), None
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Gaida Gregor
Muller Fritz
Chambers A. Michael
Feiereisen Henry M.
Gemü Gebrüder Müller Apparatebau GmbH & Co. KG
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