Valves and valve actuation – Mechanical movement actuator – Plural dissimilar mechanical movements
Patent
1991-08-29
1994-06-21
Walton, George L.
Valves and valve actuation
Mechanical movement actuator
Plural dissimilar mechanical movements
74 25, 74 8915, 744248VA, 251267, 384420, 384615, 384622, F16K 3150, F16C 1910, F16C 3358
Patent
active
053222628
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for transferring the rotational movement generated by a drive to a non-rotary stem of a shutoff valve.
In shutoff valves where the conditions of use require external, non-rotary stem threads, a threaded sleeve which surrounds the stem is necessary in order to transfer the rotational motion of a drive to the stem. The threaded sleeve in cast iron and steel valves is normally received by a machined hub. The hub is carried by an attachment which is disposed on the valve housing and has the form of a yoke (KSB Armaturen-Handbuch, 1965).
In a shutoff valve with a sheet metal housing, an attachment constituted by a yoke can be employed only through the use of an expensive welded construction. However, this conflicts with the requirement, imposed specifically on sheet metal valves, for easily manufactured individual components joined to one another by a few weld seams.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a bearing device for the threaded sleeve of the stem of a shutoff valve which eliminates the known yoke configuration and is especially suitable for sheet metal manufacture.
This object is achieved by an attachment consisting of a rotationally symmetrical body and carrying the lower bearing location for the threaded sleeve, and a bearing cap connected to the attachment of a flange and containing the upper bearing location.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail with reference to the accompanying drawings in which
FIG. 1 shows a shutoff valve sectioned in the region of the stem drive,
FIGS. 2 and 3 show enlarged individual views of the components forming the bearing locations for the stem drive of FIG. 1, and
FIGS. 4 and 5 show different embodiments of the bearing locations.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The shutoff valve illustrated in FIG. 1 has a sheet metal housing 1 which is closed off from the atmosphere by a cover secured by means of a flange 2. An attachment 3 is disposed on and welded to the cover. The attachment 3 has a flange 4 which serves as a connection to a bearing disc 5 resting on the attachment 3, and as a connection to a bearing cap 6.
The bearing disc 5 and bearing cap 6 embrace a threaded sleeve 7 which is connected to a handwheel 8. An ascending, non-rotary stem 9 is surrounded by the threaded sleeve 7 which transfers a rotational movement generated by the handwheel 8 to the stem 9 in such a manner that the latter and a closure non-illustrated element--connected thereto are raised or lowered depending upon the direction of rotation.
In the embodiment of FIGS. 1 to 3, the threaded sleeve 7 is supported by additional plain bearing elements 10 and 11 which are fixed to the threaded sleeve 7. Such plain bearing elements can likewise be provided on the bearing disc 5 or the bearing cap 6. They can consist of individual members which may, for example, be adhesively connected to the component carrying them; they can also be formed by spraying an antifriction material onto one or both sliding components or can be loosely connected therewith.
The bearing disc 5, which in the exemplary embodiment of FIGS. 1 to 3 is provided with a recessed portion or a protuberance 12 serving for centering in the attachment 3, acts as an axial bearing during backward flow through the shutoff valve. A sleeve-like upper region or a recessed portion of the bearing cap 6 assumes the axial bearing function during forward flow through the valve and the radial bearing function during flow in any direction.
In the embodiment illustrated in FIG. 4, a bearing collar is eliminated. The axial bearing function during backward flow through the valve is here assumed by a ball bearing whose balls 13 are supported on a shoulder 15 provided in the attachment 14. A bearing cap 16 acts as an axial bearing during forward flow through the valve, as well as a radial bearing, in the manner described above.
The embodiment shown in FIG. 5 has a bearing disc 17 and a bearing cap 18 which are likewise made of
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Bartoschek Manfred
Lovisetto Primo
KSB Aktiengesellschaft
Walton George L.
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