Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed
Patent
1991-07-22
1992-11-10
Walton, George L.
Valves and valve actuation
Mechanical movement actuator
Particularly packed or sealed
277183, 277189, F16K 4104
Patent
active
051617803
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a spindle seal for a valve.
In the known cast and steel valves, sealing chambers for the spindle seal are preferably formed in thick-walled housings or housing covers. It is further known to place a stuffing box packing or ridged packing ring serving as a spindle seal in a seal carrier which is separate from the housing or cover of the valve.
Thus, a carrier socket for a ridged packing ring is known from the German Offenlegungsschrift 2 252 532 and lies on a shoulder formed in the valve housing. The socket, which fills the space between the inner wall of the housing and the seal, is by nature a thick-walled component. The outer surface thereof which is in contact with the housing wall serves for centering.
A socket accommodating the rings of a stuffing box packing which surrounds the valve spindle is known from the U.S. Pat. No. 2,622,838. The socket is here located in the cover of the valve housing. It again constitutes a component which completely fills the space between the seal and the inner wall supporting the socket.
Thick-walled seal carriers having an outer contour matched to an inner wall which receives the carrier are acceptable only where the gap between the inner wall and the spindle seal is not large. Furthermore, the solutions found for the thick-walled valves and seal carriers cannot be readily transferred to sheet metal valves since their substantially thinner walls are unable to have chambers formed therein.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a shutoff valve seal whose seal carrier is also suitable for sheet metal housings. According to the invention, the object set forth is achieved by a sheet metal seal carrier having a peripheral centering section which is in surface-to-surface contact with the wall of the valve housing and is formed by an arch of the carrier.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail with reference to the accompanying drawings wherein;
FIG. 1 shows a shutoff valve having a sheet metal housing and a sheet metal seal carrier for the spindle seal, and
FIG. 2 is an enlarged view of the seal carrier of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The valve housing 1, which is assembled from sheet metal parts by means of welding, consists essentially of a main portion 2, a housing attachment 3 and a cylindrical attachment 4 which is disposed above the housing attachment 3 and accommodates the operating mechanism of the shutoff valve.
A handwheel 6 serves to activate a closure element--not illustrated--affixed to a spindle 5.
The upper dividing wall between the interior of the valve housing 1 and the surroundings is a housing cover 7, and the spindle seal of the shutoff valve is located in the region of the housing cover 7. The components 8,9 serving as a spindle seal are received by a seal carrier 10 which is clamped between the housing attachment 3 and the housing cover 7. Sealing at the outer diameter of the seal carrier 10, and thus of the housing cover 7, is accomplished by an 0-ring 11 which is situated in a chamber defined by the housing attachment 3 and the flange 12 of the seal carrier 10.
The nature of the seal carrier and the different chamber configurations obtainable with the same internally of the housing allow a variety of sealing materials to be used in order to satisfy various requirements as regards pressure, temperature and the nature of the fluids to be passed through the valve. Elastomeric, fluorothermoplastic and graphite seals, in particular, come into consideration. It is even possible to selectively place different types of seals in the same chamber. A special design, or additional measures and means, are unnecessary.
Sealing can also be accomplished by a flat seal disposed between the housing attachment 3 and the housing cover 7.
As is seen in FIG. 2, the seal carrier 10 defines a socket 13 at its center, and the socket 13 exhibits a diameter gradation in the direction of insertion of the seal 8,9. This assures con
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Bartoschek Manfred
Lovisetto Primo
Kontler Peter K.
KSB Aktiengesellschaft
Walton George L.
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