CH361952A - Device for controlling the flow of a fluid in a passage - Google Patents

Description

Device for controlling the flow of a fluid in a passage The present invention relates to a device, in particular to a valve, for controlling the flow of a fluid in a passage, comprising a seat fixed annular ring which surrounds said passage and a closure cover hinged on a Support, the Support being movable to apply the cover to the seat and to separate it therefrom.

Known devices of this type do not completely meet the important condition of a seal that is both durable and excellent.

In order to meet this condition, the device which is the subject of the invention is characterized in that the cap has over its entire periphery a convex spherical surface embedded in a surface of the support, in the form of a bowl, on which it can slide freely, forming therewith a first ball and socket stop, and further has a concave spherical surface, of the same center and of smaller radius than the convex spherical surface, in contact with another surface of the Support On which it can slide freely, forming therewith a second ball-and-socket, opposite the first, the common center of the two spherical surfaces being placed beyond the first ball-and-socket, with respect to the Support.

The closure face of the lid is preferably spherical and cooperates with a spherical seat of the same curvature or a conical seat. The closing face of the cover could also be flat to apply: On a flat seat or with a tangent curvature to the plane of the cover. The mounting of the cover on the Support is self-centering.

The approach movement of the lid On its seat Good first contact between Popercule and the seat. Then, this approach movement continuing, the lid tilts on its two ball joints until the moment when an ideal contact surface is entirely defined on the seat. Ort can then Good ner closing locking effort Sann cause friction between the first seat and 1'operculum. Before final closure, the seat supports only the negligible effort required to tilt the valve.

This arrangement at the moment of approaching the valve makes it possible to correct Bus alignment faults, machining errors or even operating wear. It also allows an approach to the support such as a c16, which carries RTI ID="0001.0271" WI="16" HE="4" LX="1747"LY="1523"> the lid, in a plan not parallel to that of the seat, which is the first case. when the key is controlled to close by a pendular movement.

The final contact between the cover and the seat is always made along an ideal geometric surface, due to the tilting with gentle friction of the cover on the sei: robules, until the choice of this ideal contact. In this closed position, the center of the outer curvature of the lid always returns to the center of the tubing passing through the top of the cone of the seat.

In addition to the advantage of self-centering, the double ball-and-socket seal is load stable and does not vibrate or flap. This quality is due to the absence of axial play and to the peripheral contact of the seal which prevents the action of the fluid on its internal face.

In addition, due to the embedding of the peripheral ball joint in its conical bore, the cover has a high support rigidity, there is no risk of it deforming under the action of the closing pressures. In approach and <B>rotation</B> manoeuvres, it remains perfectly attached to the pike carrying it. The central ball joint and its bearing face make maneuvers independent of the direction of pressure.

These qualities mean that the double-ball joint seal is specially designed to provide metal-to-metal seals. Surface conditions <B>of</B> the seat and the cover that can be kept intact due to the absence of friction.

When the disc and the seat are made of different materials, sealing is also achieved in the best conditions with the double ball-joint disc.

It should be noted that the supports of the central and peripheral ball joints can be machined either conical or spherical. It is for example advantageous to provide a conical bearing for the peripheral ball joint and a spherical bearing for the central ball joint.

The appended drawing shows, by way of example, several forms of execution of the device which is the subject of the invention.

fig. 1 is a section of a first form of execution, taken according to the fluid passage fax. fig. 2 is analogous to FIG. 1, but shows the device in another Position.

Figs. 3 to 9 are respectively sections of seven other embodiments, also following the line of the fluid passage.

The device represents in FIG. 1, which consists of a valve, comprises a fixed annular seat 10, a closing cover 11 which cooperates with the first seat 10 and a support 12 which carries the cover 11. In the example of FIG. 1, the seat 10 is formed at the end (a pipe element 13 whose inside diameter is designated by the reference 0. The seat 10 is conical but could be spherical and is intended to receive an outer spherical zone 14 of the operculum 11. The support 12 is mounted movable between one or more positions where the zone 14 of the operculum 11 is away from the seat 10 and a closed position where the zone 14 of the operculum 11 is applied against the first seat 10. In the example of FIG. 1, the pike 12 is formed by a wedge having a central passage 15 of the same diameter 0 as the pipe 13 and which, in the fully open position, becomes aligned with the pipe 13. The c16 holder 12 can, for example, be mounted rotating around (Tun axis Z perpendicular to the plane of FIG. 1, with a stroke of 900 between the position represented and the opening position according to the flkhe F, while it has to perform a small translation parallel to the axis of the pipe 13 to go from the Position represented to the Closed Position. Any appropriate control can be provided for maneuvering the c16 door-operculum 12 between positions. opening and closing.

The mounting of the cover 11 on the cover-holder pike 12 comprises: a first bearing 16 of the cover, a first counter-bearing 17 of the pike 12 receiving in application the bearing 16, the said first bearing 16 and counter-span 17 forming RTI ID="0002.0273" WI="6" HE="4" LX="978" LY="2456"> a First bearing with ball joint 16-17 around a determined center 0 and activates Jans the first direction of approach to the first seat 10, a second door 18 of the cover, a second counter-port6e 19 of the part 12 receiving in application the port6e 18, said second door 18 and against - bearing 19 forming a second ball and socket stop 18-19 around said center 0, opposite to the first and active in the first direction away from the seat 10, so that the two links 16-17 and 18-19 provide safe guidance play of the operator 11 with respect to the part 12 in any spherical movement around said common center 0.

The first bearing surface 16 of the cover 11 is peripheral and usinde spherical convex along a radius R of center 0 while the counter-bearing 17 of the piece 12, which cooperates with the port of 16, forms for the latter a conical factory housing in part 12, the first contact being made along a circumference passing in the first plane HH' which is always the same with respect to pike 12 (see fig. 1 and 2). The second bearing 18 of the opereulum 11 is central and machined concave spherical along a radius r of the same center 0 but smaller than R. The bearing 18 is defined by a member 20 screwing at 21 into a thread 22 of 1 lid 11 in such a way as to allow the assembly and disassembly of the assembly 11-12 and on the other hand to allow the tightening of the bearing surfaces: 16-17 and 18-19 to be measured at a degree of gentle friction free of play After adjustment, screw 20 is locked on cover 11 by a 20" pin or other appropriate locking or braking means. spherical along radius r with center 0 and is finished on a flange 23 embedded in part 12.

The common center 0 is chosen above the contact line H-H' of the port & 16 with its corresponding counter-port 17. The center 0 is at the top of the sphere dHini by the closing surface the cover 11. The center 0 is placed in such a way that the cone angle a of the counter-conical seat 17 in which the peripheral spherical seat 16 rotates, has a value which opposes jamming and that the curvature of the central ball joint 18 19 is not too flat. This double favorable condition is obtained when the first center 0 is above the line HH'.

The mounting with double ball joints 16-17 and 18-19 allows the oscillations of the disc 11 in all planes, therefore its self-centering on the conical seat 10 of the valve body and this without any axial play RTI ID= "0002.0545" WI="3" HE="5" LX="1147" LY="2129"> or harmful friction on the 1st seat. At each closing, the cover 11 has the choice of its contact circumference on the seat 10, which makes the construction independent of the machining clearances. An excellent and durable seal is thus obtained, due to the absence of harmful friction on contact.

Among other advantages, these provisions also make it possible to: - avoid the phenomena of flapping of the Tors actuator during: maneuvers under load; - to make the operation of the key independent of the direction of the Pressure; - to maintain good rigidity of the lid thanks to its peripheral support on the c16. It will further be noted that the closing operation of the valve remains excellent even if the approach movement of the part 12 towards the seat 10 is misaligned with the axis of this seat 10. As seen more particularly in FIG. 2 the double ball-and-socket stops 16-17 and 18-19 make it possible to compensate for misalignment, alignment faults which here are angular; according to F6cart ss than linear according to Fcart b. At the moment of the final closing contact, the center C of external spherical curvature of the lid returns to the axis of the pipe passing through the vertex D of the cone of the seat. It will be understood that in FIG. 2 an exaggerated the alignment faults which, in practice, will never reach the extent represented, and this in order to better highlight the possibilities of self-centering of the operculum 11 even under the most difficult conditions. difficult.

It will also be noted that for the above reason and to make the drawing easier to read, the proportions of the various elements shown in figs. 1 and 2 conform more to a schematic representation than to a representation of industrial production. On the other hand, the following figures 3 to 9, which relate to applications of the invention to various types of valves, are in accordance with a representation of an industrial embodiment.

Reference will now be made to FIG. 3 where the arrangement is analogous to that which has just been described with reference to FIG. 1 but the conical thrust 17, which receives the peripheral spherical seat 16 of the cover 11, is here made in an intermediate Base Plate 24, which is fixed by screws 25 to the part 12. second counter-port6e 19, which is always central, is here arranged on the spherical machined head 26 of a screw 27, which is screwed at 28 into the intermediate plate 24. Port & 18, which cooperates with the con- tre-port6e 19, is provided on a sole 29, which is screwed at 30 and blocked in a thread of the cover 11. The soft friction adjustment is obtained by screwing the screw 27 on the intermediate plate 24 The assembly shown in FIG. 3 Good the advantage of the choice of mAal for the whole of the double ball joint. For example, the c16 12 pellt be in Ponte, and the Plate 24, as well as the cover 11, in sulfinized stainless steel oll in Bronze oll in any other metal.

11 is to be noted that the valve of fig. 3 pellt eire realized without Intermediate bare plate 24, for example as shown in FIGS. 6 to 9.

Reference will now be made to FIG. 4, which relates to a valve of the quarter-turn spherical Bit type, the body of which can be seen at 31. FIG. 4 at 13 the pipe, at 10 the seat which is here formed by an embedded ring of plastic material such as Teflon (registered trademark), oll other material with a low coefficient of friction, at 11 the cover, 12 the c16, and in 16-17 and 18-19 the, two ball joints.

The control of the c16 12 is simple f movement, that is to say that the approach to the seat 10 takes place at the same time as the key 12 turns. It is in order to facilitate the friction which results therefrom at the moment of contact that the seat comprises a lining with a low coefficient of friction 10. This lining 10 could be arranged on the lid 11 instead of on the seat. The control of the key 12 also has a double movement, that is to say that the approach of the cover 11 is independent of the rotational movement of the key 12, the double ball joint 16-17 and 18- 19 to avoid rubbing on the seat. Dann this case, the trim 10 pellt be removed.

The double ball joint 16-17 and 18-19 is particularly suitable for the type of valve in fig. 4, which can thus withstand the pressure in both directions and whose first opening movement is facilitated by the absence of axial play and the good support of the cover 11 on the c16 12 by the peripheral ball joint 16-17 .

fig. 5 shows a globe valve, and fig. 6 an inclined seat globe valve. In both cases, the piece 12 Jans which is provided with the conical bore 17 receiving the peripheral ball joint 16 is simply integral with the translation in the direction of the arrow F' and not with the rotation of the control rod 32 and this by the intermediary of two half-rings 33. The tightness remains excellent despite the play or misalignment due to wear of the control rod 32. The seat can be provided on the valve body 31 as in FIG. 5 to 6 compared as in fig. 6.

fig. 7 shows a horizontal check valve provided with a disc 11 with double ball joints 16-17 and 18-19. The sealing remains independent of the play of the rod 34 in its housing 35.

fig. 8 shows a check valve of the swing type, provided with a disc 11 with double ball joints 16-17 and 18-19. As for fig. 7, the frequency of movement of these types of valves Good results in wear of their guides or fixings. With the double ball-and-socket seal, these wears such as that of Faxe 36 remain without effect on the tightness, the self-centering being always ensured.

Reference will now be made to FIG. 9, which relates to a butterfly valve with a disc 11 with double ball joints 16-17 and 18-19 and two-step closing control. The cover 11 comprises an attached seal ring 37. This cover 11RTI ID="0003.0543" WI="10" HE="4" LX="1814" LY="2147"> rests by its peripheral ball joint 16 in 1 the conical bore 17 formed in the central part 12 mounted rotating at 38. The central seats 18 and 19 are in application and the 1st soft adjustment friction is obtained by the 1st assembly and the 1st braking oll locking of the screw 27 screwed at 28 in the part 12. In fig. 9, year also sees that the first choice of the center 0 ensures a good cooperation of the two ball joints 16-17 and 18-19 and that it is below the top of the. spherical closing surface of the lid 11. To allow the rotation of the assembly 12-11 on the valve body 31, the seat 10 has a corner cone at the top which is much more closed than in the valves of FIGS. 1 and 3.

The two-step closing control of the butterfly valve in fig. 9 is produced as follows: at the first stage, the approximation rings 39 are stationary and the shafts 38 rotate together by 900, thus bringing the lid 11 in front of its seat 10. At the second stage, the shafts 38 are immobilized in rotation while the connecting rings 39 turn together. The bores of 38 of years 39 being eccentric, the rotation of 39 produces the bringing together of all the parts 38, 12 and 11 and the bonding of the cover 11 on its seat 10.

As before, the double ball joint 16-17 and 18-19 allows a closing without friction of the lid 11 on its seat 10, which ensures an excellent and durable seal.

Claims (5)

CLAIM Device for controlling the flow of a fluid in a passage, comprising a fixed annular seat which surrounds said passage and a closing cover articulated on a support, the support being movable to apply the cover to the seat and to to separate it, characterized in that the lid has over its entire periphery a convex spherical surface embedded in a surface of the support, in the form of a bowl, on which it can slide freely, forming with the latter a first bearing with ball joint, and also has a concave spherical surface, of the same center and of smaller radius than the convex spherical surface, in contact with another surface of the support on which it can slide freely, forming therewith a second abutment ball joint, opposite the first, the common center of the two spherical surfaces being placed beyond the first ball joint stop, relative to the support. 1. Device according to claim, characterized in that the surface of the lid which comes to apply on the fixed seat is located beyond the first ball-and-socket stop, relative to the support, and in that that the common center is beyond said surface, relative to the support. 2. Device according to claim, characterized in that said concave spherical surface is provided on a part of the cover which is made solid with the rest of the cover by screwing. 3. Apparatus according to claim and sub-claim 2, characterized by a rusting worm device preventing said part from unscrewing. 4. Device according to claim, characterized in that the surface of the support which is in contact with said convex spherical surface is provided in a plate fixed to the .support, and in that the surface of the support which is in contact with said surface concave spherical is formed in a part screwed into this plate. 5. Device according to claim and sub-claim 4 characterized by a rusting worm device preventing said part from unscrewing.