FR2638503A1 - DISCHARGE DISCHARGE DISC DISCHARGE VALVE FOR DISCHARGING A FLUID - Google Patents

Abstract

a) Disc valve with removable relief sleeve for fluid flow. b) characterized in that it comprises: - a valve body 10, 11 having an internal cavity provided with a fluid inlet port 15 and a fluid outlet port 16; an upstream disc 22 rotatably supported in the cavity of the valve body and comprising a fluid passage 27, 28 intended to conduct the fluid; - Means 24 for rotating this upstream disc; a downstream disc 31 placed opposite and against the upstream disc in the cavity of the valve body, this downstream disc comprising a fluid passage 29, 30 intended to conduct the fluid coming from the fluid passage of the upstream disc; - a tubular insertion element 33 supported in the valve body so as to conduct the fluid coming from the fluid passage of the downstream disc towards the outlet orifice; - means for locking the insert element with the valve body; - And means 32 for locking the downstream disc with the insertion element; - This insertion element comprising a frustoconical part with a circular cross section. c) The invention relates to a disc valve with a removable discharge sleeve for the flow of a fluid.

Description

"Disc valve with removable discharge sleeve for the flow of a

  The invention relates to a disc valve with a removable discharge sleeve for fluid flow, which valve is provided with disc elements which can move relative to one another, each of the elements having an opening of fluid that can be brought into alignment or out of correspondence in order to transmit a fluid to a discharge orifice, or more particularly, the invention relates to improvements of such a valve comprising a discharge orifice formed, downstream of disks, by a sleeve. firmly attached to the body of

valve.

  This invention relates to a valve having a fixed disc and a rotating disc mounted against each other. These disks are each provided with at least one orifice for adjusting the fluid flow rate by the size of the holes drilled in the disks and by a degree of alignment. The angular movement of one disc relative to the other within the valve body is achieved by rotating a handle located outside the valve body. The disk can be moved to move the valve from a fully open position in which the hole or holes of one disk are aligned with the hole or holes of the other disk for maximum flow, up to a position completely closed in which the hole or holes of the disks are not aligned and are blocked by

  solid parts of the disc facing.

  Valves of the type are particularly useful for controlling the flow of fluids from oil and gas wells or the like. Such a valve is used to control the flow of well fluids that may contain abrasive contaminants such as sand particles. Such a fluid, when it enters the valve, can be under an extremely high pressure of the order of 20.68 to 106 Pa for example. The openings of the disks have a smaller section than an upstream inlet chamber, or a downstream discharge chamber formed in a valve body. The reduction in section at the height of the opening of the discs causes an acceleration of the fluid passing through the openings. The accelerated fluid exiting the opening of the downstream disk enters a discharge chamber having a section

  greater than the section of the opening of the downstream disk.

  Due to the construction of the discharge chamber, particularly when the latter is formed by a removable sleeve placed in the valve body, this results in a significant drop in pressure of the fluid passing through the sleeve. Its effect is to reduce the capacity of the valve and, because of the implementation of a removable sleeve, to reduce sudden changes in the fluid flow conditions at the opening of the sleeve, variations resulting in turbulence, especially at the outlet of the valve which is not protected by the

replaceable sleeve.

  In valves of known shapes of the type considered here, the outlet orifice is defined by an oblong transverse configuration located immediately downstream of the downstream disk. The oblong configuration results from the need to form openings for receiving retaining rods for securely securing the disk in the valve body. The surface of the oblong configuration is reduced by the thickness of the sleeve when such a protective sleeve is required for the outlet chamber. The reduced oblong surface of the disk in turn limits the maximum size of the disk that can be used with the removable sleeve, as compared, for example, to the size of the oblong outlet chamber

  obtained when not using a removable sleeve.

  A smaller transmission volume of the fluid in the sleeve causes a greater pressure drop of the fluid passing through the sleeve, reducing

thus the capacity of the valve.

  In addition, in the valves of known shapes using removable sleeves at the outlet chamber, the sleeve is glued to the valve body by an adhesive such as an epoxy glue on which it also counts to prevent the passage

  of fluid between the sleeve and the valve body.

  When it is necessary to replace the sleeve, the valve body should be heated to a temperature sufficient to soften the epoxy adhesive so that the sleeve can be removed. Typically, it is conventional to heat a valve body at a temperature above 121 ° C to effectively soften the epoxy glue so as to be able to

replace the sleeve.

  With regard to these known devices, the present invention relates to a disc valve with removable discharge sleeves for the flow of a fluid: a valve body having an interior cavity provided with a fluid inlet port and a fluid outlet port; an upstream disk rotatably supported in the cavity of the valve body and having a fluid passage for conducting fluid; means for rotating the upstream disk; a downstream disk placed opposite and against the upstream disk in the valve body cavity, this downstream disk having a fluid passage for conducting the fluid from the fluid passage of the upstream disk; a tubular insertion member supported in the valve body for conducting fluid from the fluid passage from the downstream disc to the outlet port; means for locking the insertion member with the valve body; and means for locking the downstream disk with the insertion element; this insertion element comprising a frustoconical part with section

circular cross.

  When desired, it can be provided that, according to the present invention, the replaceable tubular insert includes an end wall with a bore to limit the flow of liquid discharged from the tubular insert. towards

  the outlet port of the valve body.

  Preferably, a sealing bearing surface having an annular configuration is supported by the core to prevent frictional contact with a seal disposed between the downstream disk and the valve body. This surface at the same time forms a limit to the displacement of the seal in the case for example of a flow rate or a reverse fluid pressure. This surface holds in this case the seal in place

  between the disc and the valve body.

  The features and advantages of the present invention, as well as others, will be understood

  more clearly on reading the description

  following which refers to the drawings below.

  joints in which: - Figure 1 is an exploded perspective view of a valve having the features of the present invention. FIG. 2 is a sectional view of another embodiment of the assembly of the various parts illustrated in FIG. 1 to form the valve of the present invention; Fig. 3 is a cross-sectional view of a sleeve member disposed in the discharge chamber of the valve shown in Figs. 1 and 2; FIG. 4 is a front plan view of the sleeve element shown in FIG. 3; - Figure 5 is a rear plan view of the sleeve shown in Figure 3; - Figure 6 is a sectional view along the line VI-VI according to Figure 4; Figure 7 is an enlarged sectional view for illustrating the relationship between a downstream disc and the sleeve shown in Figures 3 to 6; FIG. 8 is a sectional view similar to that of FIG. 7, illustrating an embodiment of a sleeve element making it possible to obtain a predetermined pressure drop at the outlet of the valve; FIG. 9 is an end view along line IX-IX of FIG. 8; and FIG. 10 is an enlarged view similar to that of FIG. 2, but showing a preferred embodiment of the rotational coil of the valve of FIG.

the present invention.

  Figures 1 and 2 show a valve comprising a valve body consisting of body portions 10 and 11 respectively provided with flanges 12 and 13. The flange 13 comprises tapped holes for receiving the ends of bolts 14 passing through holes piercing the flange 12 to assemble the component parts of the body of the valve. With this configuration, it is possible to access the interior of the valve for mounting the internal elements. The body portion 10 includes an inlet portion formed by an enlarged hub 15 having an opening provided with an internal thread for receiving a corresponding threaded end portion of a pipe. In the same way, the valve body portion 11 is provided with an enlarged hub 16 having an inner threaded portion capable of receiving

  the threaded end of a fluid flow pipe.

  As best seen in Figure 2, the inlet of the body portion 10 formed by the hub extends to the cylindrical cavity 17. A core 18 is rotatably mounted in this cylindrical cavity 17. Seals O-rings 19 and 20 are mounted in annular grooves formed in the core near its ends, and form seals with the valve body to prevent fluid passage between the core and the valve body. The fluid supplied to the valve through the inlet can pass into a passage 21 formed in the core 18. In this embodiment, the passage 21 extends along the length of the core. At the end of the core 18 facing the outlet of the valve, the cavity 17 extends beyond the end of the core and a cavity 17A is formed in the form of an extension of the cavity 17 in the part of body 11. A floating disc 22 is disposed in driving position with the core 18 by means of rods 23 penetrating into openings of the disc 22 and in corresponding openings in the end face of the core 18. turn the core 18 by a control handle 24 provided with a threaded end portion passing through a curved slot 25 of the valve body portion 10. This threaded end portion of the handle 24 engages with in a threaded opening

26 formed in the nucleus 18.

  It will be noted that the slot 25 is located

  in the valve body between the two O-rings.

  When the core is turned by the operation of the handle, it rotates about an axis corresponding to the longitudinal axis of this core. The rotation of the core 18 communicates a rotational movement to the disc 22 so that, in the embodiment shown in FIGS. 1 and 2, the openings 27 and 28 of the disc 22 can be brought into alignment or coincidence position, or out of this position, with the corresponding openings 29 and 30 of a disc 31. The disc 31 is held in a fixed position relative to the body portion 11 by anchor rods 32 which, as can be better seen in Figure 1, are housed in openings of the disk 31 and in corresponding openings of a

removable sleeve 33.

  According to FIG. 2, the upstream disc 22 is displaced angularly from the handle 24 and through the core 18. According to a variant of this embodiment, the core may however be removed and in this case, the rod 24 will be connected. directly to the upstream disk 22 through the slot

25.

  The sleeve 33, as indicated in FIGS. 3 to 6, comprises, according to the present invention, an annular downstream outlet portion 35 and an upstream portion 36 in the general shape of a truncated cone. Part 36, as best seen in Figure 4, is provided at its upstream end with projections 37 penetrating into the conical configuration of the body portion 11. These projections are provided with holes 32A receiving the anchor rods 32 The transverse surface of the sleeve is, over its entire length, maximized in capacity for

  carry as much fluid as possible.

  In this way, a lower pressure drop is largely ensured by the flare formed by the truncated cone portion of the sleeve. This flare also reduces turbulence and the tubular outlet port of the sleeve portion 33 is adapted to accommodate the outlet of the valve body to prevent undesirable turbulence.

  in its unprotected or uncladged part.

  As can be seen in Figures 3, 5 and 6, attachment lugs 40 are formed outside the sleeve 33 at diametrically opposite points. These lugs are constituted by projections formed on the outer surface of the sleeve and fit into cavities shown in FIG. 2, these cavities being formed in the bearing surface of the sleeve of the valve body on the downstream side of the disc 31. The sleeve of the present invention is designed to avoid and eliminate the need for using an epoxy glue or other adhesive to hold the sleeve on the valve body. The sleeve 33 is held against the bearing surface in the valve body by the fluid pressure exerted on the body

  valve at the inlet end.

  It can be seen in Figure 2 that the

2638S03

  fluid pressure applied to the core, whether or not it is in a position to supply fluid to the discharge portion, experiences a pressure drop because the core has a smaller fluid passage. This pressure difference or fluid pressure retained by the discs creates sufficient force to hold the discs against each other and also to press the sleeve against the valve body with sufficient force to maintain their relationship.

cushioning.

  As best seen in FIG. 7, to avoid an undesirable passage of fluid between the sleeve and the valve body, an O-ring 42 is used housed in a gap formed between the outer peripheral surface of the disk 31 and the wall. the valve body portion 11. The arrangement of the O-ring is such that it is housed at the level of the line of separation between the sleeve

  33 and the seating surface of the valve body 11.

  In a preferred embodiment of the present invention, as shown in FIG. 10, the O-ring 42 is retained in the immediate vicinity of its desired sealing point by a cylindrical extension 43 of the core 18. This extension 43 has a relatively thin end resulting in a thicker rim 44 formed by an enlargement of the outer diameter of the portion 43. The end face of the rim 44 is sufficiently wide to block the O-ring 42 and prevent undesirable movement away from its point of contact. seal. This extension 43 of the core further serves to facilitate the mounting of the valve by holding the discs 22 and 31 against each other, the upstream disc 22 being

  locked to the core by the rods 23.

  During normal operation of the valve, the inlet pressure is higher than the outlet pressure, allowing the fluid to flow from the inlet to the outlet. The flow rate is controlled by the relative positions of the openings 27, 28, 29 and 30 of the two discs. The O-ring 42 is held in place by friction and the differential pressure pushing this O-ring towards the low pressure side of the valve. In the past, abrupt changes in downstream fluid flow conditions, for example due to valve closure or a sudden drop in flow conditions, caused a hydraulic water hammer leading to the outlet. at a momentary pulse of pressure higher than the fluid pressure at the inlet. This pressure pulse can, in some cases, be large enough to dislodge the seal constituted by the O-ring. When the seal provided by the O-ring is interrupted, fluid may flow between the sidewalls of the disk and the cavity formed in the valve body. However, the material used to form the valve body can not normally withstand the abrasive shear produced by the bypass flow of the fluid, so that

  irreparable damage occur.

  In other cases, flow feedback may occur for any reason. It then establishes, through the valve a flow of fluid in the opposite direction, that is to say from the inlet to the outlet, the result of which is the same as that produced by a hydraulic ram. The extension of the core avoids, as described above, in this case, the O-ring 42 is dislodged from its seat. The restraint formed by the extension can be obtained by dimensioning this extension so as to avoid friction or friction during the adjustment of the valve during its implementation, and so as to form a limit to the trajectory of the O-ring 42. If a reverse flow or a reverse pressure variation occurs, the O-ring seal 42 moves only to the extent permitted by the restraint provided by the extension of the rotational coil. The range of motion is such that O-ring 42 is held in place between the disc and the valve body, so that when normal pressure flow conditions are restored in the valve, the O-ring immediately returns to its position. suitable sealing. The use of an extension on the rotating core has the additional advantage that the installation of the O-ring 42, which must be sealed and uniformly stuck around the periphery of the disc, can be obtained without being necessary to use

special instruments.

  In the past, when the O-ring 42 was placed at the sealing point, it was conventional to wedge the seal using a sharp blade such as a screwdriver. It was not possible

  to obtain a good uniform housing of the O-ring.

  On the contrary, using the extension of the coil, we obtain an automatic placement of the O-ring along its entire length. However, it can be understood that the retention function of the cylindrical extension can be obtained by using, for example, an extension of the housing portion 12 arranged so as to project into the opening formed in

  the housing portion 11 to receive the disks.

  Figures 8 and 9 illustrate another embodiment of the discharge sleeve in which the sleeve 33A is provided with an end wall 45 at the discharge end of the tubular portion 35A of this sleeve. The end wall 45 is provided with an opening 46 for conducting fluid from the sleeve to the discharge outlet opening. The opening 46 is dimensioned so that a predetermined pressure drop is obtained in the valve. This fixed pressure drop adds to a variable pressure drop produced by the disk flow adjustment. The size of the opening 46 must be chosen according to the particular application for which the valve has been designed. Thus, the opening 46 must be sized and pierced according to predetermined requirements. In this way, it is possible to produce two pressure drops inside the valve, and to reduce or eliminate

  thus cavitation phenomena in this valve.

  By placing the end wall opening 45 at the geometric center of this end wall, any possible turbulence or cavitation is isolated at the center of the outlet orifice, which avoids the adverse effects caused by cavitation at the end of the outlet wall. 'in law

walls of the outlet.

  Although the present invention has been described with reference to the preferred embodiments of the various figures, it is obvious that other similar embodiments may be used, or that different modifications and additions may be made to the embodiments described herein. to perform the same functions as those of the present invention without departing therefrom. As a result, the present invention should not be limited to any one embodiment, but should instead be

  interpreted broadly according to the claims

attached.

Claims (2)

1 ') Disc valve with removable discharge sleeves for the flow of a fluid, characterized in that it comprises: - a valve body (10, 11) having an internal cavity provided with a port of fluid inlet (15) and a fluid outlet (16); an upstream disk (22) rotatably supported in the cavity of the valve body and having a fluid passage (27,28) for conducting fluid; means (24) for rotating the upstream disk; - A downstream disk (31) placed opposite and against the upstream disk in the cavity of the valve body, the downstream disk having a fluid passage (29, 30) for conducting the fluid from the fluid passage of the upstream disk; a tubular insertion member (33) supported in the valve body for conducting fluid from the fluid passage of the downstream disc to the outlet port; means (40) for locking the insertion member with the valve body; and means (32) for locking the downstream disk with the insertion element; - This insertion element comprising a frustoconical portion (36) circular cross section. 2 ') valve according to claim 1 characterized in that the tubular insertion element (33) comprises means projecting from the frustoconical portion for receiving the locking means of the downstream disk with this tubular insertion element, these means being constituted by elements (32) penetrating into the housing of the downstream disk. 3 ') valve according to claim 1 or 2, characterized in that it comprises a core (18) rotatably mounted in the cavity of the valve body in a right offset upstream relative to the outlet orifice of fluid, said core having a fluid passage (21) in communication with the inlet for directing the fluid to the outlet port of the valve body, the means for rotating the upstream disk facing the core to put in or out the passages of the two disks. 4 ') Valve according to any one of the preceding claims, characterized in that the tubular insertion element (33) comprises a cylindrical fluid discharge part (35) and upstream thereof, a frustoconical part ( 36) for receiving fluid from the downstream disk (31), said frusto-conical portion having externally protruding wing portions (40) and forming anchor points for locking the tubular insert with the body of valve. -) Valve according to any one of the preceding claims, characterized in that the locking means of the tubular insertion element with the valve body are constituted by means (40) for preventing rotation of the element tubular insertion relative to a corresponding surface formed on the valve body. 6 ') Valve according to any one of the preceding claims, characterized in that the tubular insertion element comprises an end wall (45) at its fluid discharge end, this end wall being pierced with an opening (46) for conducting the fluid to the outlet.   7) A valve according to claim 6, characterized in that the opening (44) has a predetermined size to obtain a predetermined pressure drop in the fluid driven by the valve. 8e) Valve according to any one of   preceding claims, characterized in that   further comprises means (42) for preventing the passage of fluid between the insertion element tubular and the valve body.   9 ') valve according to claim 8, characterized in that the means (42) for preventing the passage of the fluid flow are constituted by an O-ring.   Valve according to claim 9, characterized in that it further comprises means (43, 44) for preventing the O-ring from being dislodged from its sealing position between   the valve body and the tubular insert.   11) Valve according to claim 10, characterized in that the means for preventing the O-ring is dislodged, are constituted by   a wall portion (43) projecting from the core.   12-) Valve according to any one of   preceding claims, characterized in that the   valve body has an interior cavity extending to the fluid inlet port, which cavity has an opening sufficient to support the core and form a seal of fluid with it.