Valves and valve actuation – Reciprocating valve
Patent
1991-08-29
1993-01-12
Rosenthal, Arnold
Valves and valve actuation
Reciprocating valve
2513353, 251326, F16K 3316, F16K 108
Patent
active
051783657
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a shutoff or control.
In valves where forces act on the spindle transverse to the spindle axis, the spindle must be supported in the housing. The danger of unacceptably large transverse forces arises primarily in valves where the displacement during actuation is large. Gate valves, in particular, are to be mentioned here. Support is achieved by means of ribs or grooves on or in the housing, or by means of special abutments which surround the spindle and are in contact with the housing wall.
FIG. 3 of the German patent 1 959 547 shows a valve which is equipped with an abutment of sheet metal. The abutment has an outwardly directed flange which surrounds the spindle, and the spindle can slide up-and-down in the outwardly directed flange. The abutment is provided with a circumferentially extending collar which bears against the housing wall where it is secured in a manner not indicated in detail.
To the extent that they are arranged near the valve seat, supports or abutments which are fixed relative to the housing allow only a relatively short stroke of the spindle. Accordingly, they cannot be used for gate valves and valves with a stroke of similar length. On the other hand, if the support is disposed at a location farther away from the valve seat in such a manner as to permit the full opening stroke of the closure or control element, its supporting function is necessarily limited. Due to the large spacing from the support, the transverse forces which are generated by the flow and act on the closure or control element can, in an extreme case, lead to such great deflection of the closure or control element that its function is no longer assured.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a shutoff or control valve whose closure or control element is reliably supported against transverse forces even during a long stroke.
For an abutment disposed in the housing and supporting the spindle, the object set forth is achieved in that the abutment is connected with the spindle in the vicinity of the closure or control element and has an outer surface slidably guided at the housing wall surrounding the outer surface. The seat formed in the valve housing for the closure or control element is arranged transverse to the flow direction so that the abutment supports the spindle against the transverse forces generated by the flow.
The abutment, which is located in the vicinity of the closure or control element over the entire range of the stroke, reduces the bending moment on the spindle to a minimum regardless of the flow direction. Accordingly, an adjustment of the spindle diameter to a long stroke taking into consideration the bending forces is unnecessary.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail with reference to the accompanying drawings wherein:
FIG. 1 is a partly sectional view of a shutoff valve having an abutment which supports the spindle,
FIG. 2 is an enlarged detail view of the abutment of FIG. 1,
FIG. 3 is a plan view of the abutment of FIG. 2,
FIG. 4 shows another embodiment of the abutment,
FIG. 5 is a plan view of the abutment of FIG. 4, and
FIG. 6 is a sectional view of a further valve having an abutment which supports the spindle.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The gate valve illustrated in FIG. 1 has a housing 1 which is assembled from a number of sheet metal components by weld seams and screw joints. A seating ring 2 is connected to the housing 1 by welding and cooperates with a closure element 3. The closure element 3 is secured to a non-rotary spindle 4 which is movable up-and-down. An abutment or support 5 serves to support the spindle 4 and is connected with the spindle 4 via a square coupling element 6 so as to be fixed against rotation. Upon movement of the spindle 4, the abutment 5 slides up or down in a housing neck 7.
As can be seen particularly clearly from FIG. 2, the transverse abutment 5 has an outer surface 8 which slides on the wall of the housing neck.
REFERENCES:
patent: 2504057 (1950-04-01), Trefil
patent: 3488034 (1970-01-01), Masheder
Bartoschek Manfred
Lovisetto Primo
Kontler Peter K.
KSB ASktiengesellschaft
Rosenthal Arnold
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