FR2520085A1 - Butterfly gate control valve - has elastic diaphragm which ensures sealing in closed position - Google Patents

Abstract

The valve comprises a body (1a-d), inside which a butterfly gate (2) closes against a valve seat (S). The butterfly gate (2) is attached to an elastic diaphragm (O) which is deformed under pressure to seal the valve seat (S). To open the valve, the head (13) is turned one quarter of a revolution, which rotates the cylindrical sleeves (3,4) and the shaft (9) freely in bearings (9a,9b) inside tubular sleeves (5,6). The diaphragm is also attached to the shaft (9), so the butterfly gate (2) is also rotated through a quarter of a revolution, thus opening the valve.

Description

 The subject of the invention is a butterfly valve with a butterfly control device.

 The object of the invention relates to the technical sector of operating devices with fluid pressure and more particularly with valves.

 Valves are known which comprise a body internally and axially having an annular seat against which is applied, in the valve closed position, a shutter member better known by the name of "Butterfly".

 Generally, the throttle valve can be controlled from outside the valve body, to pivot angularly by a quarter turn to release its support seat in the valve open position.

 There is very often a significant sealing problem in the support of the butterfly against its seat.

 The invention has set itself the aim of solving this problem in a particularly simple and effective manner in opposition to the known devices which are very complex and of a high cost price.

 According to a first characteristic of the invention, a suitably profiled member is integral on the one hand with the butterfly and, on the other hand, with a device for controlling the rotation of said butterfly, while a control means' from the 'outside the valve body, is shaped to act in combination with said member, pushing on the butterfly in order to make it strongly press against its support seat in the valve closed position.

 These characteristics and others will emerge from the following description.

To fix the subject of the invention, without however limiting it, in the appended drawings:
Figure l is a side view in longitudinal section of the valve according to the invention in the closed position of the butterfly and when the elastic member is not operated.

 Figure 2 is a front view corresponding to Figure l.

 Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2.

 Figure 4 is a partial sectional view, taken along line 4-4 of Figure 1.

 Figure 5 is a view similar to Figure l in the butterfly opening position.

 Figure 6 is a sectional view similar to Figure t showing an action on the elastic member in order to exert a bearing force against the butterfly to apply it strongly on its seat.

 FIG. 7 is a sectional view taken along line 7-7 of FIG. 5.

 Figure 8 is a sectional view taken along line 8-8 of Figure 5.

 Figures 9 and 10 are views of profiles in tudinal longitudinal section showing two alternative embodiments of the valve according to the invention.

 Figure 11 is a purely schematic view of another embodiment, for controlling the butterfly.

 In order to make the object of the invention more concrete, it is now described in a nonlimiting manner with reference to the exemplary embodiments of the figures of the drawings.

 We see in Figure 1 in particular, a butterfly valve which, in a known manner, comprises a body (1) inside which is pivotally mounted a butterfly (2) angularly controlled from, fired from outside the body thus being capable of being either applied against an annular seat (S) of the body, which corresponds to the closed position of the valve, or released from said seat, which corresponds to the open position of the valve .

 By way of non-limiting indication, the body (1) has two opposite circular flanges (la and lb) against which can: wind be mounted face-to-face for example diaccouple flanges = ment (B) (drawn in dashed lines in Figure 5} relating to piping elements (T) Perpendicular to the generators of the body (l), are formed two cylindrical ends (lc and ld) diametral ~, ment opposite.

 According to the invention, the butterfly (2) is integral facial, directly or in an attached manner, with an axial member () ri-; gide and suitably shaped by being capable of being deformed under the action of at least one pushing force in order to create a resultant force directly applied to the butterfly (2) in order to have it pressed strongly against its annular seat d support (S).

 In a first embodiment, the member (o) is deformed, elastically mé under the action of two opposite thrust forces.

and in the example of figures ld 9,
For this purpose, / the member (O) is coupled at two opposite ends, located perpendicular or substantially to the connection plane of said member (O) against the corresponding face of the butterfly (2), d of tubular sleeves (3 and 4) . These sleeves (3 and Q) are mounted and guided by free sliding in the bore of cylindrical sleeves (5 and 6) opening respectively outside the end pieces (ic and ld) and in the axial bore (le) valve body (l).

 Each of the sleeves (S and 6) is mounted to rotate freely in the body (l) of the valve and has, overflowing the cylindrical ends (lc and nest), a shoulder (5a - 6a) which rests on the flanges ( 7a - 8a) of sealing rings (7 - 8) respectively centered in the bore of said end pieces (lc and ld).

 A coupling pin (9) is shaped to ensure the connection of the sleeve-sleeve assembly (5 - 3) and (6 - 4). This axis (9) is freely engaged in the bore of the sleeves (3 - 4) and has b its ends, directly or - in a reported manner, a cylindrical bearing (9a - 9b) each of the bearing surfaces (9a and 9b) mounted with free sliding inside the sleeves (5 and 6), is arranged to act in thrust on the sleeves (3 and 4), that in an opposite way, when the axis (9) is rotated as it is indicated in the following description.

 For example, the ends in contact with the cylindrical surfaces (9a - 9b) and the sleeves (3 - 4) are profiled in cam (C) and (Cl) respectively of not directly opposite pitch so that, in a single direction of rotation of the axis (9), said sleeves are urged to move axially and linearly close to one another.

 For this purpose, the ends in contact with the cylindrical bearing surface (9a) and the corresponding sleeve (3) have, on a semi-circumference, a cam profile (C) with a pitch to the right (FIG. 8), while the the contacting ends of the cylindrical seat (9b) and of the sleeve (4), also have in a semi-circumference, a cam profile (Ci) with a step to the left (FIG. 7).

 It is obvious that in both cases, the profiles of the cams (C and Cl) are identical. As an indication, we can cite that the low point of the cams is at O and the high point at 1.5 mm (Figures 7 and 8).

 On the other hand, each of the sleeves (3 and 4) is coupled to the corresponding sleeves (5 and 6) -to be driven in rotation simultaneously while being capable of being moved linearly inside said sleeves along a limited length .

 To this end, the sleeves (5 and 6) are equipped with a finger (10) which engages in an oblong hole (3a and 4a) machined in the thickness of a shouldered head (3b - 4b) relating to the sleeves (3 and 4) (Figures 1 and 4). Springs (11 and 12) are mounted in the bottom of the sleeves (5 and 6) being stopped at their other end by the shouldered heads (3b - 4b) of the sleeves (3 and 4) in order to ensure their permanent return towards the top.

 The projecting part of the sheath (5) for example, is shaped to be coupled to a drive head (13) secured to an operating member (13a). Likewise, one of the ends of the connecting axis (9), and secured by pin (14) or otherwise, to an operating member (15).

 It is now necessary to analyze the operation of the valve according to the invention with particular reference to Figures 1, 2, 5 and 6 of the drawings.

 To open the valve, it suffices to angularly actuate a quarter turn, the drive head (13) which has the effect of driving the sleeve assembly (5) - sleeve (3) in rotation and concomitantly the sleeve assembly (6) - sleeve (4) since the two above-mentioned assemblies are coupled by means of the elastic member (O) itself connected to the butterfly (2). This consequently results in an angular rotation of 90- of the butterfly (2) which is thus positioned and arranged in a plane parallel to the axis of the valve which corresponds to the open position of the latter (Figure 5).

 To close the valve, the lever (13a) of the drive head (13) is acted in the opposite direction to return the butterfly valve (2) to the closed position of its annular support seat (Figures t and 2). However, to ensure perfect sealing, apply the butterfly valve (2) very strongly against the seat (S).

 For this, the operating head (15) is actuated substantially angularly along a half-circumference in order to drive the coupling axis (9) in rotation.

 As a result, the cylindrical bearings (9a and 9b) by their opposite cam profile (C and C1), act respectively in thrust on the sleeves (3 and 4), which has the effect of compressing the member elastically (0 ) by exerting on it two opposing forces (F1 and F2) (Figure 6). These two forces (F1 and F2) directed vertically, in two directly opposite directions, create, in combination with the profile and elasticity of the organ (O), a resulting force (R), perpendicular to the forces (F1 and F2 ), which tends & elastically deform said member (O) in the direction of the butterfly to keep it strongly applied against its annular seat (S) (Figure 6).

 The elastic member (O) can have different embodiments.

 In the embodiment of Figures 1, 2, 3, 5 and 6, the member (O) is obtained from a plate (16) suitably profiled. This plate (16) essentially has two opposite horizontal wings (16a and 16b) profiled in C whose branches (16a1) and (16bl), directly opposite, are connected by a vertical branch (16c). The branch (16c) receives in a fixed manner, the butterfly (2). For example, the branch (16c) is centered on a circular bearing (2a) of the butterfly (2) while a fixing means (17), of any type designed and suitable, ensures the locking in position of said butterfly ( figure 1).

 It is emphasized that the facing branches (16ai) and (16bol) of the wings (I6a and 16b) are suitably cut into (16d) (FIG. 3), to allow the angular displacement of the butterfly assembly (2) and profiled plate ( 16) opposite the coupling pin (3), when the valve opens (or vice versa).

 The axis (9) passes right through the wings (16a and 16b) whose branches (16a2 and 16b2) are directly fixed by any means (18) to the through ends of the sleeves (3 and 4).

In the embodiment shown in Figure 9, the butterfly (2) is attached directly or in a reported manner, a profile (19), with elastic deformation capacity, appeared as an inverted C whose ends (19a) and (19b) are curved and shaped to be coupled to the sleeves (3 and 4). The vertical branch (19c) of the profile (19) can either allow the mounting, in a reported manner, of the butterfly (2), or directly constitute said butterfly (2) A
Or else, the member ('pe, t / sonstitué directly by a spring (20) whose extreme turns are coupled to the sleeves (3 and 4). This spring is offset transversely relative to the axis (9), in the direction of the butterfly (2) which is secured, by any known and appropriate means, to one side of a part or to all of the turns.

 It is quite obvious that from this design doemoyens axial thrust, other than the circular ramp system described and illustrated in Figures 1, -7 and 8 in particular, can fall within the scope of the invention. We can for example cite lever, eccentric, cable systems ...

 Similarly, it is not necessary, depending on the type of butterfly, that the member (O) be urged in thrust by two opposing thrust action forces not only by an action force. This is the case in particular, when the valve is equipped, in a known manner, with a so-called self-centering butterfly. For example, as shown diagrammatically in FIG. 10, the self-centering butterfly (2) is directly or in an attached manner from the member (O) in the form in particular of a profile (20) with elastic deformation capacity. One of the ends of the profile (20) is integral with a shaft (22) projecting outside the body (1) of the valve being arranged to be controlled in rotation by means in particular of a lever (23) . The shaft (22) is also mounted in the thickness of the valve body with the ability to move in height.

 The other end of the profile (20) is integral with an axis (24) axially opposite the shaft (22), and mounted free in rotation in the body (1) of the valve while being immobilized in translation.

 Generally, on the side where the control shaft (22) opens, the valve body has a yoke in which is articulated an operating arm (25) which has an eccentric or ramp (25a) to act in thrust on the shaft (22), during an angular tilting of said arm (25) with a view to elastically deforming the profile (20) in order to cause the self-centering butterfly to be strongly pressed down. Indeed, the member (O) and subjected to a pushing action force due to the displacement of the shaft, and to a directly opposite reaction force applied to the fixed axis in translation (24).

 An embodiment is also provided according to which the displacement, limited in translation of the butterfly is obtained by pushing and displacement on two opposite parts, in combination with a parallelogram device (P) as shown very diagrammatically in FIG. 11, and no longer in combination with an elastically deformable member.

 The valve according to the invention finds application more particularly in all cases where an absolute seal is required. It being understood that seals (J) are suitably mounted, in particular with regard to certain constituent elements of the actuating and pressurizing device of the butterfly (2).

 For applications of the valve according to the invention at high temperatures, that is to say above the ambient temperature, it is advisable to manufacture the elastic member (O) with a material or material having physical characteristics and having undergone suitable heat treatments, so that said member (O) has sufficient elastic properties at the required temperatures.

 The advantages are apparent from the description, in particular it is emphasized - The simplicity of implementation; ^ Safety and reliability of operation.

 The invention is in no way limited to that of its modes of application any more than to those of the embodiments of its various parts which have been more particularly indicated; on the contrary, it embraces all its variants.

Claims (1)

 "Butterfly valve comprising a body (1) inside which is disposed an annular seat (S) against which is applied, in the valve closed position, the butterfly (2) which and controlled from the outside of the valve body for pivoting a quarter turn in order to release and release the seat (S) in the valve open position, characterized in that a suitably profiled member (O) is integral with a part of the butterfly (2), and, on the other hand, a device for controlling the rotation of said butterfly (2), while a means controlled from outside the body (1) of the valve, is shaped to act, in combination with said member (O), in pushing on the butterfly (2) in order to make it strongly press against its support seat in the valve closed position. -2- Valve according to claim 1, characterized in that a member (O) is elastically deformable and is coupled to two opposite parts of the assembly of the device for controlling the rotation of said butterfly (2) at least one of said parts coupled to the elastic member (O) being urged by the means controlled from the outside of the body (1) of the valve, thereby creating two forces directly opposite on the elastic member (O); the result of these forces being directly applied to the elastic member (O) which is deformed to act under pressure on the butterfly (2) in order to make it strongly press against its support seat in the valve closed position. -3- Valve according to claim 2, characterized in that the member (O) is coupled at two opposite ends located perpendicular to the connection plane with the butterfly (2), to opposite tubular sleeves (3 and 4) mounted and guided respectively in free sliding in the bore of cylindrical sleeves (5 and 6) opening on the one hand to the outside of nozzles (lc and ld) diametrically opposite and formed perpendicular to the generatrices of the body and, on the other hand, in the axial bore (it) of said body. -4- Valve according to any one of claims 2 and 3, characterized in that each of the sleeves (5 and 6) is mounted free in rotation in the thickness of the body (1) of the valve and has overflowing tips (lc and Id), a shoulder (5a - 6a) which bears on the flanges (7a - 8a) of sealing rings (7 and 8) respectively centered in the bore of said end pieces. -5- Valve according to any one of claims 2, 3 and 4, characterized in that a coupling pin (9) is shaped to ensure the connection of the sleeve-sleeve assemblies (S - 3) and (6 - 4), said axis being freely engaged in the bore of the sleeves (3 and 4) and has at each end, directly or in an attached manner, a cylindrical bearing (9a - 9b) mounted for free rotation inside the scabbards (5 and 6). -6- Valve according to claim 5, characterized in that each of the parts (9a and 9b) of the axis (9), is arranged to act in thrust on the sleeves (3 and 4) and that in an opposite manner , when the axis (9) is rotated. -7- Valve according to claim 6 and any one of claims 1 to 4, characterized in that the contacting ends of the cylindrical surfaces (9a - 9b) and the sleeves (3 and 4) are arranged in the form of cams ( C (C and CI) respectively in opposite steps, so that, according to a single direction of rotation of the axis (1), the said sleeves are urged to be pushed together axially and linearly one of the other. -8- Valve according to claim 7, characterized in that the cams (C and C1) have directly opposite steps, but have the same profile so that the sleeves (3 and 4) are moved linearly by the same distance to create on the organ (O) two opposite forces of the same intensity. -9- Valve according to any one of claims 1 to 8, characterized in that each of the sleeves (3 and 4) is coupled to the corresponding sleeves (5 and 6) to be rotated simultaneously, while being capable of be moved linearly inside said sleeves along a limited length. -10- Valve according to any one of claims 1 to 9, characterized in that the projecting part of the sleeve (S), 1 outside the body (1) of the valve, is shaped to be. Coupled to an operating head (13), in order to drive the sheath assembly (5) - sleeve (3) in rotation and concomitantly, on the one hand, the sheath assembly (6) - sleeve (4) since the two aforementioned sets are coupled by means of the elastic member (O), and, on the other hand, the butterfly (2) of about 990 to position it and arrange it either in a plane parallel to the axis of the valve , which corresponds to the open position of the latter, either against the seat (S), which corresponds to the closed position of said valve.  Valve according to any one of claims 1 to 10, characterized in that one of the extremities of the connecting axis (9) is coupled to an operating member (15) for the rotary drive of said axis, substantially along a half-circumference, so that the cylindrical bearing surfaces (9a and 9b) of said axis (9), by their cam profile (C and C1), of opposite pitch, act respectively in thrust on the sleeves (3 and 4), which has the effect of elastically compressing the member (o) by exerting on it two opposite forces (FI and F2) directed vertically, in two directly opposite directions, to create, in combination with the profile and the elasticity of the organ (O), a resulting force (R), perpendicular to said forces (F1 and F2), which tends to elastically deform said organ (O) in the direction of the butterfly (2) to keep it strongly applied against its annular seat (S). -12- Valve according to any one of claims 1 to 11, characterized in that the member (O) and a plate (16), suitably profiled, having essentially iux opposite horizontal wings (16a and 16b) C-shaped including the facing branches (16al) and (16bol) are connected by a vertical branch (16c) which receives, in a fixed manner, the butterfly (2); the branches (16al) and (16bl) are suitably cut in (16d) to allow the angular displacement of the butterfly assembly (2) - plate (16> having regard to the coupling axis (9) which crosses the wings (16a and 16b) whose branches (16a2) and (16b2) are directly fixed to the through ends of the sleeves (3 and 4). - 13 - Valve according to any one of claims 1 to 11, characterized in that, in a variant, the elastic member (O) is a profile (19), with capacity for elastic deformation, having the appearance of 'an inverted C whose ends (19a and l9b) are curved and shaped to be coupled to the sleeves (3 and 4); the vertical branch (lake) of said profile (19) can either allow the mounting, in a reported manner of the butterfly (2), or directly constitute said butterfly (2). -14- Valve according to claim 1, characterized in that, in the case of self-centering butterfly in particular, one of the parts of the member (O) which has an elastic deformation capacity is integral with the rotation control device, and is shaped to be urged by the means controlled from outside the body, the other part being fixed in translation, thereby creating two directly opposite action and reaction forces; the result of these two forces being directly applied to the member (O) which is elastically deformed to cause the self-centering butterfly to be strongly pressed in a regularly distributed manner. -15- A valve according to claim 1, characterized in that, alternatively, the limit displacement in translation of the butterfly (2), is obtained by displacement and thrust on two opposite parts in combination with a parallelogram device. -16- A valve according to any one of claims 1 to 14, characterized in that, for high temperatures, the member (O) is made of a material having pyentes characteristics and having undergone appropriate heat treatments of so that said member (O) has sufficient elastic properties at the required temperatures.