WO1986001274A1

WO1986001274A1 - Stop valve for mounting in a pipeline

Info

Publication number: WO1986001274A1
Application number: PCT/DK1985/000075
Authority: WO
Inventors: Eli Vestergaard Jensen
Original assignee: Aps Hvkmd 5 Nr. 352
Priority date: 1984-08-06
Filing date: 1985-08-06
Publication date: 1986-02-27
Also published as: DK379084D0; AU4720785A; EP0190271A1; DK157375C; DK379084A; DK157375B

Abstract

In order to cut off the flow of highly polluted fluids such as sewage, liquid manure and the like, a valve should be self-cleaning in its operation in order to stop any passage of flow sufficiently. To this end a valve according to the invention may be applied with a valve body in the shape of a rotatable throttle (5, 8), which at its periphery has two mutually separate flexible projections (6, 7) running along the periphery of the throttle in an unbroken line and partly scraping off and partly sealing the pipe wall when the valve is closed. The projections (6, 7) and the core (5) of the throttle are preferably made of a flexible plastic. On both sides of the throttle plates (8) are attached which by means of throughgoing bolts (9) partly provide the throttle with sufficient rigidity and partly squeeze it tightly to the throughgoing spindle (4).

Description

STOP VALVE FOR MOUNTING IN A PIPELINE.

This invention relates to a valve, preferably for mounting in a pipeline and comprising a rotatable throttle standing parallel to the direction of flow, with the valve in its opened position, and which may be moved to a transverse position, thus cutting off the flow.

Valves of this type are applied in installations where the fluid is reasonably pure, the valve not being able to form a satisfactory and complete sealing if deposits occur on the inside of the pipe, because the throttle will .not always obtain the required sealing contact with the pipe wall. Moreover, such a valve will not easily remain tight at high pres¬ sures, the throttle having a comparatively limited sealing contact with the pipe wall.

This restricts the use of such valves although they are sturdy and simple, and limits the range of appli¬ cation to flowing fluids with a specific low- degree of pollution and operating pressure.

It is the object of the present invention to overcome these disadvantages of the known valves of this type, and this object is achieved by a valve according to the invention, wherein the throttle consists of a disk, attached to a throughgoing spindle, and where two flexible and mutually separate projections extend from the disk, said projections running along the periphery of the throttle in an unbroken line, and abutting the inside of the pipeline in the closed position of the valve.

By designing the periphery of the throttle in this manner, first of all an effective scraping off and cleaning is achieved of that area of the pipe against which the throttle is to abut and seal closely, when the throttle is turned to its closed position, in that the foremost projection in the direction of motion will act as a scraping edge, whereas the actual sealing will be effected, when the rear projection abuts the cleaned pipe wall. Thus, at least one pro¬ jection will always establish sealing contact with the pipe and ensure that the valve will function even with highly polluted liquids such as sewage and drainage from- both dwellings and stables. A valve of this type may therefore replace the far more com¬ plex stop valves, such as sliding valves normally applied for this purpose.

Furthermore, tests have proved that a valve according to the present invention mounted in a PVC-pipe will resist a pressure higher than that for which the pipe has been approved and without the valve leaking. This is due to the labyrinth-like sealing made up by the projections together with the pipe wall which can be made to seal more less tightly by choosing the oversize of the projections in relation to the inside diameter of the pipe.

By forming the whole core of the throttle and the projection in one piece of flexible plastic, such as Neoprene, as dealt with in claim 2, the production may be considerably simplified, the basis being a disk, which, by circular periphery, can be cut around the centre line of the periphery to form the projecti¬ ons.

By making the projections flat on the outside in¬ clining towards the centre of the throttle, as dealt with in claim 3, an effective scraping edge and at the same time a firm axially extending abutment to the pipe wall are obtained.

Finally, it is expedient, as dealt with in claim 4-, to fit rigid plates on both sides of the throttle, parly to make for the required rigidity, partly in order that the throttle can be fixed tightly around the spindle, and partly to allow control of the com¬ pression and hence the extent of the oversize of the throttle within the range of deformation of the material.

In the following the invention will be described in further detail with reference to the drawing, wherein

fig. 1 is a section parallel to the axis of rotation of the throttle, shown along the line I-I in fig. 2, and

fig. 2 is a section at right angles to the axis of rotation of the throttle, seen along the line II-II in fig. 1

The drawing illustrates a preferred embodiment of a valve according to the invention mounted in a stan¬ dard PVC-pipe applied for e.g. sewage and drainage pipes

By mounting a valve of this type in a pipe system, a flow of fluid can be stopped and at the same time the flow may be controlled by means of a valve.

The pipe 1 is shown as a socket pipe where the actual valve is fitted at the desired place of the pipe.

The throttle of the valve is mounted rotatably on the pipe by opposed bearings 2 and 3 , attached to the pipe in a commonly known manner by e.g. welding or the^' like.

A throughgoing spindle 4 made of e.g. stainless steel runs from a suitable . place from the pipe 1 through the bearing 2 and out through the opposed pipe wall to' the bearing 3.

Gaskets are fitted in the bearings 2, 3 in a generally known manner in order to stop the fluid from flowing out of the pipe via the spindle.

The actual throttle consists of a flexible core 5, preferably made of Neoprene and supplied with a groov¬ ed cut around the centre of the outer periphery, as shown in the drawing. Two flexible projections 6 and 7 are formed in this manner, said projections being flat on the outside and inclining towards the centre plan of the core on the inside to create a sharp edge for the projections. The spindle 4 runs through the core 5 in the axis of rotation of the throttle. In another embodiment (not shown) the core 5 of the throttle is made of PVC, which has sufficient rigidity to squeeze around the spindle 4 in order that the valve disk is firmly attached to the spindle. On the outside of the core 5 Neoprene disks are then placed being bevelled on the outside to form, the flexible projections 6 and 7. »

To support the throttle and at the same time facili- tate the attachment to the spindle, a plate 8 is fitted on both sides of the core, said plates being assembled by means of throughgoing bolts 9. The plates 8 may be made of PVC or stainless steel, where high pressures and velocities of flow call for a strong valve.

The plates may be placed inside the throttle, e.g. by insertion in the core. The area of flow with the valve in its open position is thus larger, the throt- tie being narrower. By a suitable choice of core material the core and hence the projections 6 and 7 may be given a certain oversize by tightening the assembly at the bolts 9. In this manner wear and tear are compensated for, and a certain adjustment to the operating conditions may take place.

As shown in fig. 1 illustrating the throttle in its closed position, both projections abut the pipe wall in a flexible manner such as to establish a complete sealing in both directions of flow. The spindle 4 is encased between the projections and does not cause any leakage. Moreover, a double seal will exist with the side wall preventing foreign matter between a projection and the pipe wall from causing leakage. The valve is turned to its opened position, where the throttle is more or less parallel to the direction of flow in the pipe.

By closing the valve the throttle is turned, e.g. anti-clockwise as illustrated in fig. 2. The projec¬ tion 7 being foremost in the direction of motion will serve as an effective scraper cleaning the side wall by pushing any foreign matter in front of it and thereby ensure a clean sealing surface for the rear projection 6, which, as indicated by the dotted line, will be brought to abut very closely to the side wall.

This throttle construction has in practice turned out to be superior to other known valves in terms of performance and cost. It is simple and reliable in operation, and it will sustain larger operating strains than that for which PVC-pipes are approved.

Moreover, the valve is easy to operate by means of a handle or motor, and it being self-cleaning even in highly polluted fluids, such as sewage, liquid manure or the like, it is applicable for such pur- poses. It may be given any required dimension and be fitted in existing installations or supplied as a ready valve for mounting in a pipe.

Due to its high degree of reliability in operation it is therefore suited for mounting in hidden instal¬ lations not directly accessible.

In the shown and described embodiment a circular pipe cross section is used, but it is within the scope of the invention to use the valve in any adjust¬ ed shape, e.g. with cross sections such as box section pipes .

In a valve where the valve body can be displaced axially in a 'pipe between two positions on both sides of one or several openings in the pipe, the valve body may advantageously be given a construction cor¬ responding that of the throttle according to the invention.

By attaching an operation rod to the throttle, said throttle will form the valve body of the valve, and an effective scraping off of the pipe wall is ensured by means of the foremost projection in the direction of motion, and an effective sealing to the pipe wall by means of the rear projection is obtained.

The advantages achieved by a throttle in a revolving valve are therefore the same as those achieved by an axially displaceable valve body in a pipe section, when the valve body is designed with two separate flexible projectins running along the periphery of the valve body in an unbroken line.

Claims

P A T E N T C L A I M S

1. Valve, preferably for mounting in a pipeline and comprising a rotatable throttle standing parallel to the direction of flow with the valve in its opened position ^'and which may be moved to a transverse posi¬ tion, thus cutting off the flow, c h a r a c t e¬ r i z e d in that the throttle consists of a disk (5, 8) attached to a throughgoing spindle (4) and in that two flexible and mutually separate projections (6, 7) extend from the disk (5, 8), said projections running along the periphery of the throttle in an unbroken line and abutting the inside of the pipeline (1) in the closed position of the valve.

2. Valve according to claim 1, c h a r a c t e ¬ r i z e d in that the core (5) of the disk and the projections (6, 7) are made in one piece of flexible plastic.

3. Valve according to claim 1 and 2, c h a r a c ¬ t e r i z e d in that the projections (6, 7) are flat on the outside inclining on the inside towards the centre plan of the disk ( 5 ) .

4. Valve according to claims 1 - 3, c h a r a c t e ¬ r i z e d in that a rigid plate ( 8 ) is secured on both sides of the core of the disk (5).