GB2303901A

GB2303901A - Butterfly valve

Info

Publication number: GB2303901A
Application number: GB9515708A
Authority: GB
Inventors: San Pedro Francisco Arino De; Luisa Esmoris Dominguez; Luis Arino Barrio
Original assignee: SAN PEDRO FRANCISCO ARINO DE
Current assignee: SAN PEDRO FRANCISCO ARINO DE
Priority date: 1995-07-31
Filing date: 1995-07-31
Publication date: 1997-03-05
Also published as: GB9515708D0

Abstract

A butterfly valve seat 2 is secured in a valve housing 1 by two annular retainers 8, each of which is recessed to receive a projection 10 on the seat 2. The surface of the seat which is adapted to engage the butterfly closure disc is profiled to provide either tangential or seating contact. A peripheral seal may be similarly mounted on the butterfly closure disc (Figs. 7 and 8, not shown).

Description

BUTTERFLY VALVE The objective of the invention is a butterfly valve which is adaptable to flowing liquid which permits the instalation of piping where the installed valve can be used for different types of fluids without having to modify or jettison the valve body or the mechanisms that constitutes it.

The objective of the invention is also to provide the industry with a valve in which the shutting elements can be easily changed over maintaining in an easy and cheap way the valve in perfect working conditions.

BACKROUND TO THE INVENTION Technically speaking Possibly the oldest valve was that one used in the floodgate of the irrigation systems of open canalization in ancient civilizations. But,when the closed pipe line was invented ways of shuting and /or opening the tubular pipe lines became necessary in order to be able to steer the systems and distributions of the liquid. In this way the butterfly valve,a valve that is still irreolaceable in determined applications, originated.

In fact,when dealing with piping of more than one metre in diameter the use of the butterfly is indespensable. So another type of valve,such as shutting sphere type is unthinkable because of its dimensions,cost,wheight and the instalation and maintenance difficulties.

Although a substitute for the butterfly valve has not been found, the maintenance operators of the instalations unavoidably requiring this type of valve,are not remotely satisfied by the performance and less by the repairing difficulties that are needed to maintain the valves in perfect operational conditions.

Technically, solutions to improve the performance have been sought,but one valid solution universally adaptable to whatever piping diameter and type of crossways flowing product has yet to be found.

Essentially, a butterfly valve consists of an internally circular tubular master body and a discoidial flange fitted into the interior of the master body. The flange gyrates around a diametrical axle and, when its position is totally transversal,fits into the interior wall of the master body,theorically blocking it in watertight manner. But this means that whatever strange particle interposed between the wall of the master body and the edge of the discodial shutting body may cause it to lose its shutting effectiveness and result in fluid losses. These losses are always irremediably significant in proportion to the large diameters that are used. The discodial flange incorporates a diametrical axle that gyrates on being propelled by manual,mechanical,hydraulic,electric or combined methods of opening and shutting between the theorical watertightness and the total opening.This makes it possible to adopt intermediate positions which is unavoidably an obstacle to a free passage of the flowing product because it is subjected to a continuos and irremediable erosion that is accelerated or minimized depending on the fluid that flows through its interior.

Realisations are known,and in fact a proposal in the specialised market exists,of butterfly valves where the discoidal element is inclined in such a way that the shutting seat is in a dioganal (not perpendicular) to the symmetry of the axle of the master body. But although the risk of the water hammer has been diminished the difficulties of construction,maintenance,and repairing have increased in a manner excessive to the benefits that can be achieved. This stops it being an interesesting option from an economic point of view, and only useful in very special cases.

No butterfly valve is known, in that there is no market presence or theorical proposal for a detachable valve that permits a rapid and economic recuperation of its critical shotting parts and that even comes closeto the rate of form and natural material of the product that eventually has to flow through the instalation.There is not even a literature patent for an inventon.

Known in which one can find a similar proposal to this invention.

DESCRIPTION OF THE INVENTION In accordance with that explained the invention consists in arranging a ring in the interior of the master body,where the discoidal flange plays,propelled by conventional methods which contitutes the futterfly shutting the edge of the flange in the interior or in the lateral of the ring,which is arrnged in a bed prepared in the master body and immobilized by means of each hoop being divided one on either side of the ring where the discoindal flange plays.This optionally presents a peripheral packing on its edge that is linked to the discoidal flange and fitted through the extreme edge or the lateral to the ring.

The ring is of variable material depending on the fluid that circulates through the interior of the master body and is subtitutable for another of the same material or internal form depending on whether the discoidal flange shuts, peripherally or laterally.This ring is laterally provided of one projecting or peripheral chamfer that emerges from the bed where the ring rests and is fitted into the prepared peripheral grooves in the hoops divided from the fastening of the ring onto the master body.

It has to be noted that the bed the master body presents to the ring is a projecting ladder that encases and seats the ring to receive the fastening hoops laterally,which by means of assistant screws through the projecting ladder are linked among themselves and in relation to the ladder immobilizing by its wings the ring making up a whole with the master body of the value It has been previously explained the ring shuts the discoidal flange both tangentially and laterally and the discoidal flange optionally presents its edge peripherally packed by a strap that fixes to the madiant flenge each lateral peripheral clamp that are encased in prepared antagonistic grooves between the coupling elements and fixed there by conventional methods such as screws.

Finally it has to be emphasized that when the ring offers the lateral shutting to the flange it asymmetrically presents a projecting ladder that determines a wing of the lateral seating for the flange,a wing whose cross section corresponds with the lateral cross section of the flange whether the packing is present or not.

The lateral shutting ring is divided diametrically in such a way that one part is speculatively reversed in relation to the other presenting the discoidal flange with two opposite shutting zones depending on the direction of the operational slue of the discoidal flange that constitutes the butterfly.

The described valve can be manipulated operatively from the interior of the conduction or piping in such a way that the watertingtness adjustment in the maintenance operatons can be executed without detaching the master body.This is of absolute importance in diameters that greatly surpass one metre,and permits workers and the maintenance material or its subtitution,access into the interior of the piping through the check valve mouths when a new liquid type is being installed.

A page of drawings accompanies this text where an example of a practical realisation of the real possibilities of the invention has been represented.

DESCRIPTION OF TEE DRAWINGS Figure 1 shows a frontal elevated view of the valve Figure 2 shows a sectioned detail of the cross section permitting the direct representation of the internal parts of the whole of the master body, and showing the disposition of the ring and the lateral hoops.

Figure 3 shows a sectioned detail of the shutting ring and the methods of vinculation to the bed that the master body presents.

Figure 4 shows a lateral shutting ring with asymmetrical ladder.

Figure 5 shows a diametrically divided ring positionally inverted to obtain the lateral shutting of the discoidal flange.

Figure 6 shows a discoidal lateral shutting flange which depending on the cross secction of the ring can act with tangential shutting.

Figure 7 shows a discoidal flange with peripheral packing.

Figure 8 shows in detail an example of vinculation of the packing to the discoidal flange with fixing clamps.

In accordance with the described drawings the invention consists in arranging in the interior of the master body 1 a ring of various possible configurations 2,2',2"in which the discoidal flange 4 plays,propelled by convectional methods 3 that constitutes the futterfly shutting the edge 5 of the flange in the interior 6 of the ring 2 or in the lateral 7 of the ring 2' or in the seating 17 and 18 of the ring 2",finding the ring arranged in the bed 20 provided in the master body 1 and immobilized by means of each hoop 8 being divided one on either side of the ring where the discoidal flange plays 4,which optionally presentsa peripheral packing 9 on its edge 5 that is linked to the discoidal flange and fitted tangentially or laterally to the ring.

The ring 2 is of variable material depending on the fluid which circulates in the interior of the master body 1 and is replaceable by another material or internal form according to which the discoidal flange 4 shuts peripherally or laterally.In each case the ring should be prepared laterally from each projecting or peripheral chamfer 10 that emerge from the bed 20 where the ring rests and inserted into the peripherally prepared mounths 11 in the divided hoops of the fastening 8 of the ring to the master body 1.

The discoidal flange 4 optionally presents its peripherally packed edge 5 with a strap 9 that is attached to the flange through each lateral peripheral clamp 13 that inserts into antagonistic chamfers 14-15 provided between the cuopling elements and is fixed there by conventional methods such as screws.

It is important to insist that the asymmetry o the ladder in the case of the lateral shutting ring 2" corresponds with the thickness of the discoidal flange 4 in such a way that the operational shutting of the 4 in relation to its seats or shutting zones 18-19 is exercised in a homogenous manner.

The lateral shutting ring 2", as shown in fig. 5, is divided diametrically in such a way that one part 16 is speculatively inverted in relation to the other 17 presenting to the dicoidal flange 4 two opposed shutting zones 18-19 according to the direction of the operational slue of the discoidal flange 4 that constitutes the butterfly.

It is not considered necessary to make the contents of the descriptive reports more extensive because an expert in the material would be able,in view of how much has already been explained, to put a realisation into practice.

Claims

l.Butterfly valve adaptable to flowing liquid characterized in that it incorporates in the interior of the master body a ring where the discoidal flange (propelled by conventional methods)plays, that contitutes the butterfly, whose edge determines the shutting of the flange tangentially or laterally to the interior of the ring.
2.Butterfly valve adaptable to flowing liquid according to the previous claim characterized in that ring is of variable material depending on the liquid that circulates in the interior of the master body and can present diverse internal forms.
3.Butterfly valve adaptable to flowing liquid according to the previous claim characterized in that the ring is arranged in a bed prepared in the master body and immobilized in it by means of each hoop being divided one on either side of the ring where the discoidal flange plays.
4.Butterfly valve adaptable to flowing liquid according to the previous claims characterised in that the ring is prepared laterally of projection or peripheral chamfers that emerge from the bed where the ring rests and houses the prepared peripheral mouths divided or not from the fastening of the ring to the master body.
5.Butterfly valve adptable to flowing liquid according to the previous claims characterized in that the ring can consist in a symmetrical ring with its surface curved which makes it shut the edge of the flange tangentially.
6.Butterfly valve adaptable to flowing liquid according to the claims 1,2,3,4 characterized in that the ring can consist in a symmetrical ring with each facing seat shutting the edge of the flange in the lateral of the seats of the ring.
7.Butterfly valve adaptable to flowing liquid according to the claims 1,2,3,4 characterized in that the ring can consist in a ring of lateral shutting divided diametrically in such a way that the seats are displaced in relation to one another presenting two opposed shutting zones to the flange according to the operational direction of the discoidal flange that constitutes the butterfly.
8.Butterfly valve adaptable to flowing liquid according to claim 6 characterized in that the distance between the seats of the lateral shutting ring coincide with the thickness of the discoidal flange in relation to whether its seats or shutting zones are exercised in a homogenous manner.
9.Butterfly valve adptable to flowing liquid according to claim 1 characterized in that the discoidal flange presents optionally its packing edge peripherally by a strap that is fixed to the flange by means of each laterally peripheral clamp that fits into the analgous chamfers between teh coupling elements and is fixed there by conventional methods.