DE2952637A1 - HIGH PRESSURE THROTTLE VALVE WITH SYMMETRIC SEAT - Google Patents

Description

High pressure butterfly valve with symmetrical seat

In summary, the invention is concerned with a throttle valve with a rotatably or pivotably attached throttle disc, which is opposite the axis of a flow channel through the valve has inclined peripheral edge, and with an annular Seal, which consists of a base body supported by the valve housing, a base body extending from the base body to the edge of the A flexible neck extending towards the disc and a flap part carried by the neck, which consists of two in There is spaced apart flexible lips, which point in opposite directions and in one inclined plane substantially parallel to the inclined edge of the disc for engagement with the spaced arranged parts of the pane edge are arranged.

030029/0765

8018/05 / Ka / Ws - 9-19 Dec 1979

The surfaces of the neck, which lips from the base body for both extend correspondingly, the disc are on opposite sides directed to the flow channel and have substantially equal unabgeetützte surfaces, so the extent äaß to which the neck and lips of the seat in discharge direction depending on the application of flow pressure at the inflow of the flow channel are deflected, regardless of the direction in which flow pressure is applied to the channel, is the same.

You invention is concerned with a throttle valve with a valve housing in which a throttle disc for rotation or pivoting by essentially 90 ° around a is mounted transversely to a flow channel through the valve extending axis, such that the disc either can be brought into an open position in which its plane is practically parallel to the axis of the flow channel is, or in a closed position in which the plane of the disc is transverse to the channel. Valves of this general Art are usually provided with an annular flexible pad, which is passed through the valve housing, surrounding the flow channel is supported for sealing engagement with a peripheral edge of the throttle valve disc when the disc is in the closed position.

With certain types of throttle valve, especially those that are used under high pressure should run along the circumferential edge of the throttle valve disc not parallel to the axis of a flow channel,

030029/0765

295263?

8018/05 / Ka / We - 10 - 19 Dec. 1979

but is inclined towards this at an angle. The previous editions, seats or seals for the Use in valves of this type are normally designed asymmetrically. For example, this can be The valve shown in US Pat. No. 2,893,682 can only be used for a single flow direction and the sealing ring can be provided with a pressure responsive flexible part which for a direction of flow against the peripheral edge the disc rests in a sealing manner, while when flow pressure is applied from the opposite direction Liquid or gas can leak past the pane. Alternatively, US-FS 3,608,861 shows a valve which can steer the flow in both directions; however, the seat is designed in such a way that it deflects further becomes than the disc when pressure is applied to the valve in one direction and less deflected than the disc when the flow pressure acts in the opposite direction on the valve.

The present invention relates to butterfly valves of the general type as disclosed in both of the aforementioned US patents be treated; in contrast to the seat arrangements in these patents, the invention relates however, a novel seat design for interaction with a throttle valve disc with an inclined Peripheral edge, with the seat balanced or symmetrical Is formed and has such a configuration that the amount of deflection in the direction of discharge depends on the Application of flow pressure in the inflow part of the flow channel in the valve regardless of the direction in which the flow pressure is applied to said channel is the same.

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030029/076 5

8018/05 / Ka / We - 11-19 Dec 1979

In summary, the invention relates to a throttle valve with an axial flow channel defined therein, a throttle disc, which is located in the housing is pivotally mounted about an axis transverse to the axis of the flow channel, so that the channel for the flow a flowable medium can optionally be closed or opened; the peripheral edge of the disc a sealing surface which is inclined at an angle with respect to the axis of the flow channel, and a sealing ring with a new symmetrical design is supported by the housing and circumscribes the flow channel for a sealing engagement with the inclined circumferential sealing surface on the edge of the pane when the disc is in its closed position relative to the flow channel.

The sealing ring according to the invention has a base body, which has a substantially rectangular cross section and which as will be described in either a symmetrical or an asymmetrical relationship to the Rest of the ring can be arranged, as well as an unsupported one flexible neck which is responsive to flow pressure and extends from the main body in the direction of the axis of the Flow channel extends, as well as a flexible lip part, which carried by the innermost end of the flexible neck for sealing engagement with the peripheral edge of the disc will.

The innermost surface of the sealing ring i.e. that surface of the lip part which is closest to the axis

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030029/0765

2952S37

8018/05 / Ka / Vs - 12-19 Dec 1979

of the flow channel has a curved shape with a curvature larger than that of the Circumferential surface of the disk; it defines two axially and radially spaced apart fluid pressure responsive lips which extend in opposite directions Directions extend and which are arranged such that they are in flexible engagement with spaced apart Parts of the inclined edge of the pane can go. The two oppositely directed lips are in arranged in a plane which is essentially at the same angle of inclination with respect to the axis of the flow channel are inclined like the edge of the pane; are the radial positions of the lips relative to the axis of the flow channel chosen so that when the throttle disc is in its closed position, the two lips in contact with substantially the same extent the peripheral edge of the disc. The lower edges of the two lips go relative to the axis of the flow channel gradually over into unsupported surfaces on opposite sides of the neck of the sealing ring, whereby this unsupported surface of the neck preferably have a gently curved design, the flow pressure are exposed and face the parts of the flow channel on opposite sides of the disc, when the disc is in its closed position. They are essentially the same corresponding surface dimensions, whereby the neck of the seal seat and the lip part supported by it is deflected in the outflow direction when flow pressure is applied to the inflow part of the flow channel; the extent this distraction is independent of the direction in

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8018/05 / Ka / We - 13-19 Dec 1979

which the flow pressure is applied to the flow channel, the same.

In a preferred embodiment of the invention, the housing has two projections with a curved design, which with the sighting ring near the connection between the main body of the ring and the curved unsupported surfaces of the neck of the ring can engage. The unsupported areas of the neck are spaced from the base body projections radially inward from the contact areas and have increasing axial dimensions in directions radially inward from the base of the ring by regions in which the unsupported surfaces of the ring are exposed to the flow pressure in the flow channel can be. The curvatures of the flow pressure exposed surfaces of the neck and protrusions are similar to each other, each of the projections forming a support surface which is substantially in shape with the adjacent one Surface of the neck coincides to support the neck of the sealing ring after this in the direction of drainage has been deflected a predetermined amount determined by the distance between each protrusion and the opposite surface of the neck of the seal.

The sealing ring of the present invention can be made of fabrics exist commonly used for throttle valve seals, including flexible ones Plastics e.g. Teflon or nylon or elastomeric materials such as natural or synthetic rubber.

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030029/0765

8018/05 / Ka / Ws - 14-19 Dec 1979

The above objectives and advantages and the structure and the puncture of the present invention results in detail from the following description with reference to the drawing, which shows a cross section of part of a shows balanced or symmetrical sealing ring, which is constructed according to the present invention, and its relative position to the housing and the inclined edge of the valve disc of the throttle valve.

Preferred embodiments of the invention will now be described.

A throttle valve constructed according to the invention has a housing which, among other things, consists of a housing part 10 and an adjacent housing part 11, which is shaped such that it is together with an inner Surface 10 · of the housing part 10 an annular recess 12 defines which has a continuously rectangular cross section for receiving the base body 13 of the seat 14 of the the present invention. As can be seen from the drawing, it is the base body 13 in the embodiment shown in solid lines, is arranged asymmetrically to the rest of the seat. The base body 13 can also be arranged symmetrically relative to the rest of the seat, as indicated by the dashed lines 13 *; However, this requires that the housing parts 10,11 must be specially processed to provide a suitable recess for to form the receptacle of the base body of the seal. The actual arrangement shown in solid lines is preferable because it is comparatively easy to manufacture the seat and body.

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8018/05 / Ka / Ws - 15-19 Dec 1979

The side surfaces 10 ', 11 * of the recess 12 are at the preferred embodiment of the invention in planes arranged, which are parallel to each other and essentially parallel to the pivot axis of the throttle valve disc 15 run (the disk 15 is shown in phantom because it is not part of the invention as such represents); said side surfaces 10 ·, 11 'are axially arranged at a distance which is slightly smaller than the unloaded distance between the corresponding adjacent side surfaces of the base body 13, eo that there is an overlap of im essentially 0.12 to 0.25 mm results, which securely retains the base body 13 against axial movement.

The main body 13 of the deflectable seat H gradually goes into a neck 16 with a reduced axial dimension. The Haie 16 is flexible and does not have two supported surfaces 16a, 16b which are smoothly or gently curved towards each other as illustrated and then in turn run gently away from one another in the radially outward direction in the case of the base body 13. The neck 16 goes gradually over into a lip part 17, which consists of two flexible lips 17a and 17b exposed to flow pressure, which extend in the opposite direction and which are arranged in an inclined plane 18, which substantially parallel to the inclined peripheral edge the disc 15 runs.

The lips 17a and 17b are shown in a solid line in the drawing in the unloaded state; they are

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030029/0765

8018/05 / Ka / Ws - 16-19 Dec 1979

however, so arranged and measured that when the window is closed 15 each lip by the same extent 19 with the inclined edge of the disc 15 intersects. Further the inner surface 20 of the seal seat is curved and has a curvature which is greater than that of the peripheral edge of the disc 15t so that the Lips 17a and 17b of the seat with the edge of the disc 15 at their axially and radially spaced apart Parts go into engagement, with a gap 21 between the disc 15 and a region between the lips 17a and 17b results.

In one embodiment of the invention, lips 17a and 17b have circular curvatures at their outermost Spots about 1.6 mm in diameter; the angle of the plane 18 with the axis of the valve is approximately 16.5 °; the intersection 19 about 0.25 to 0.38 mm and the gap 21 about 0.13 to 0.20 mm. These dimensions and certain other dimensions, which will be mentioned below, apply approximately to a 4 "(approx. 100 mm) throttle valve to.

The body parts 10, 11 define two gently curved annular projections 20, 23 which extend towards one another, being above the connection point between the base body 13 and the neck 16 of the sealing ring lie and hold back the main body 13 of the sealing ring against radial movement. The protrusions 22,23 have preferably a high area which is similar

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8018/05 / Ka / Ws - 17-19 Dec 1979

is shaped like that of the neck surfaces 16a, 16b but with slightly different dimensions; they are also arranged such that an overlap 24 is approximately in the order of 0.12 mm in the region of the Transitions between the base body 13 and the neck 16 results. In one embodiment of the invention, the shape is each of the two surfaces 16a and 16b and the pre-blocks 22,23 seen in cross section an arc of a circle which merges into a tangent to the circle, but it can other shapes, e.g. hyperbolic or other shapes with a conical cross-section, can also be used. Will If a circular shape is used, then the circular part of the surfaces 16a and 16b can have a diameter of about 3.16 mm, while the circular parts of the surfaces of the projections 22,23 have a diameter of approximately 2.5 mm. The neck surface 16a is arranged with respect to the outer surface of the projection 22 such that that an area is defined therebetween, the flow pressure from one side of the disc 15, e.g. in the direction of the arrow A is exposed, the area directed radially into the interior of the base body, expanding axially. A similar relationship is in the area between the shark surface 16b and the outer surface of the protrusion 23 with respect to Printing is provided, which is applied to the flow channel from the opposite direction as indicated by arrow B. will.

Flow pressure applied in the direction of arrow A is applied to surface 16a of neck 16 and to lip 17a and directs the neck and lips of the seal seat in the drainage direction until the surface 16b is in contact with the like

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030029/0765

8018/05 / Ka / Ws - 18-19 Dec. 1979

or the same shaped outer surface of the projection 23 comes, after which this a support for the sight ring forms and limits its further movement in the discharge direction. The same function occurs when flow pressure in the opposite direction to the flow channel of the Valve is applied in direction B. The unsupported neck surfaces 16a, 16b and the unsupported surfaces the lips 17a, 17b, which are exposed to the flow pressure, are dimensioned such that they are practically identical Have area sizes. It follows that the sealing ring is essentially perfect isotropic Performs movement and responds to the applied flow pressure in such a way that it is independent of the establishment in which the pressure is applied to the valve is deflected in each case by the same amount in the outflow direction.

While preferred embodiments of the invention have been described, those skilled in the art will appreciate many Variations possible. It is, therefore, to be understood that the foregoing description is merely illustrative serve and not limit the invention. All such variations and modifications, which are in accordance with the basic ideas described, should therefore fall under the scope of protection of the attached Claims fall.

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Claims (16)

Dipl.-Ing. Rolf Charrier Patent attorney RehlingenstraUe 8 ■ P.O. Box 260 D-8900 Augsburg 31 Telephone 0821/36015 + 36016 Telex 53 3 275 IMMM'hivUiinhi Munich No. l? 4 "KIKlll 8018/05 Note: Worcester Controls Corp. Ka / Ws Augsburg, December 19, 1979 Claims / 1. · Throttle valve with a housing which has a '^ Flow channel defined in it, with a throttle disc, which are pivotable in said housing to selectively open and close the channel is attached and has a peripheral edge which is inclined with respect to the axis of said channel is, and with a sealing ring which is surrounded by said housing in said channel Relation to the sealing engagement of said peripheral edge is appropriate when the disc is in closed position, characterized in that the sealing ring from a base body for support by the housing, a flow pressure-dependent, flexible lip for engagement with the said peripheral edge of the disk and an unsupported flow pressure-dependent, flexible Neck, which lies between the base body and the lip, that the flexible lip consists of two in There is spaced apart flexible lips extending in the opposite direction, which arranged in an inclined plane substantially parallel to said inclined peripheral edge of the disc are and with appropriately spaced Ö30029 / 076 '
ORIGINAL INSPECTED 295263? 8018/05 / Ka / Ws - 2 - Dec. 19, 1979 Divide the peripheral edge in approximately the same way are engaged when calibrating the disc in its closed Position is that the flexible neck has unsupported flow pressure dependent surfaces, which extends from the trimmed base body to the two lips and such are arranged so that they are on opposite sides of the disc are directed towards the flow channel when the disc is in its closed position, wherein the untrimmed flow pressure dependent surfaces are essentially the same size, so that the The extent to which the neck and lip move in the direction of flow depending on the application of flow pressure in the direction of flow of said flow channel is the same regardless of the direction in which the flow pressure is applied to the channel. 2. Throttle valve according to claim 1, characterized in that the flow pressure-dependent Surfaces of the neck are curved and that the housing has two curved projections for engagement with the has said sealing ring near the transition of the curved surfaces and the base body of the ring. 3. Throttle valve according to claim 2, characterized in that the curvatures of the flow pressure-dependent Areas and the protrusions are equal, so that each protrusion has an outer surface, which in the form of the adjacent surface of the neck 030029/076 5 8018/05 / Ka / Ws - 3 - Dec. 19, 1979 essentially the same for engaging and supporting the neck after it is drained was deflected by a predetermined amount. 4. Throttle valve according to claim 3, characterized in that the cross-sectional shapes of the curvatures are arcs of a circle, the radius of curvature of the projections being smaller than that of the Neck surface facing the protrusion so that the areas between each protrusion and the Neck surfaces increasing axial dimensions in a radially inward direction with respect to the base body have which surfaces are exposed to the flow pressure in said flow channel. 5. Droesel flap valve according to claim 1, characterized in that the base body is substantially has rectangular cross-sections and is arranged symmetrically with respect to the two lips. 6. Throttle valve according to claim 1, characterized in that the base body is substantially has a rectangular cross-section and is arranged asymmetrically with respect to the two lips, wherein the sides of the base body extend along planes which are practically parallel to the pivot axis the disc. 7. Throttle valve according to claim 1, characterized in that the housing has an inner 030029 / 076R ~ ⁴ ~ 8018/05 / Ka / Ws - 4 - Dec. 19, 1979 Defined opening for receiving the base body, as well as two projections which are mutually engaged with opposite sides of the neck extending at locations very close to the body are. 8. Throttle valve according to claim 1, characterized in that the axial cross-sectional dimension of the neck is smaller than that of the Base body. 9. Throttle valve according to claim 8, characterized in that the flow pressure responsive Surfaces are gently curved towards each other and then between the main body and the two lips are gently curved away from each other. 10. Throttle valve with a housing through which a axial flow channel runs, a throttle plate, which in the housing for pivoting about an axis across the axis of the flow channel for the selective opening and closing of the channel for the medium flowing through is attached, wherein the peripheral edge of the disc has a sealing surface which is at an angle to the Axis of the flow channel is inclined and with a sealing ring which is supported by the housing and circumscribes the flow channel for a sealing engagement with the inclined peripheral sealing surface of the disc, when the disc is in its closed position relative to the flow channel, characterized in that the innermost surface of the sealing 030029/076 5 8018/05 / Ka / W8 - 5 - Dec. 19, 1979 ring is curved relative to the axis of the flow channel with a curvature which is greater than the circumferential sealing surface of the disc and that this innermost surface is two axially and radially spaced apart Flow pressure defined lips which extend in opposite directions and in flexible engagement with spaced parts of the inclined circumferential sealing surface of the disc, that the curvature of the innermost surface is such that there is a space between the innermost surface and the sealing surface of the disc at a point between the lips results, the lips in their unloaded Position are arranged in a plane which is opposite the axis of the flow channel by substantially is inclined at the same angle as the circumferential sealing surface of the disc, so that the lips are flexible Contact with the spaced parts of the inclined peripheral sealing surface of the disc in FIG approximately the same engagement can go when the disc is in its closed position is that the sealing ring has a base body which is supported by the housing and one flexible neck, which lies between the base body and the lips, the neck in the open position of the Disc not supported by the housing and two unsupported surfaces exposed to flow pressure which face the flow channel on opposite sides of the disc when the disc is is in its closed position with the unsupported surfaces of the neck substantially - 6 030029 / 076B 8018/05 / Ka / Ws - 6 - Dec. 19, 1979 have the same area size and transfer from the base body to the two lips accordingly, so that the extent to which the neck and lips are downflow when on the upstream exerted flow pressure in the flow channel can be deflected when the disc is in its closed position Position is located, the same is independent of the direction in which the flow pressure in the flow channel is created. 11. Throttle valve device according to claim 10, characterized in that the flow pressure exposed Surfaces of the neck are curved and that the housing has two projections which with the Seal ring close to the junction of the curved surfaces with the base body of the ring in engagement can. 12. Throttle valve according to claim 11, characterized characterized in that the surfaces exposed to flow pressure and the projections have equal curvatures have and that each projection can engage the neck and support it against a further deflection after being deflected a predetermined amount in the drainage direction. 13. Throttle valve according to claim 12, characterized in that the cross-sectional shapes of the curvatures consist of arcs of a circle. - 7 030029/0765 8018/05 / Ka / We Dec. 19, 1979 14. Throttle valve according to claim 10, characterized in that the housing an inner receiving space for the base body and projections, which with the in Parts of the sealing ring arranged at a distance from one another can engage around the base body to secure the sealing ring against radial movement. 15 · Droesel flap valve according to claim 10, characterized characterized in that the axial dimensions of the neck are less than those of the main body. 16. A throttle valve according to claim 15 , characterized in that the surfaces exposed to flow pressure are gently curved towards and away from one another. 030029/0765