GB2247302A

GB2247302A - Ball-check valve.

Info

Publication number: GB2247302A
Application number: GB9114008A
Authority: GB
Inventors: Agullo Pablo Fominaya
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-06-29
Filing date: 1991-06-28
Publication date: 1992-02-26
Anticipated expiration: 2011-06-28
Also published as: FR2664016A1; IT1249946B; PT98153A; GB2247302B; ITTO910500A0; ES2025417A6; GB9114008D0; ITTO910500A1; DE4121439A1

Description

- 1 _BALL-CHECK VALVE _ 1 The present invention deals with improvements in

ball-check valves for fluids and has the purpose of avoiding leaks that are normally caused by the outlet, in the closed condition of the valve.

The type of valves on which the improvements object of the invention are centered is that in which there is an elbowed passage through the inside of the ball of the valve shaft. The section corresponding to the fluid intake remains situated in a position axial to said shaft, while the outlet section is capable of facing the connection that defines the fluid outlet.

In this type of valve, the ball remains situated between two retainers in a position parallel to each other and with regard to the drive shaft of the valve, one of which, specifically the one which is situated around the outlet, defines the seal of the valve in the fluid supply cutoff position.

BACKGROUND OF THE INVENTION

It happens that in this present type of ball-check valves, upon working with fluids under high pressures, leaks are generated in the closed position, this being due to the fact that the pressure that said fluid exerts on the ball slightly moves the ball off its seat defined by the seal.

In the present ball-check valves, in the closed position, the inside of the ball is under high pressure, while outside it and specifically in the area opposite the outlet connection of the valve, there is no pressure and therefore there is an imbalance which entails the poor seating of the ball in detriment to the watertight sealing.

DESCRIPTION OF THE INVENTION

In order to solve the cited problem, in accordance with 1..

1 l! 2 1 the invention a communication is made between the inside chamber of the ball and the outside of the same in the area opposite said connection or outlet, in other words, there is a passing of the fluid towards the outside of the ball, coinciding with the closed chamber that is formed between the wall of the body of the valve, the ball and the retainer opposite which the sealing is done in the valve outlet.

This communication can be made by drilling the wall of the ball and preferably in radial direction and a 90 degrEedisplacement in terms of the geometric axis of the section that defines the outlet of the elbowed passage of the inside of the ball. With this arrangement and due to that the closing of the valve is done by a rotation of 90 degrees upon maneuvering the knob or control of the valve, when the ball fills the closed position, said hole is situated in the center point of the chamber to which we wish to communicate the pressure of the line. This pressure of the outer chamber of the ball is identical to that which exists in the inside of the same and consequently, the pressure of the chamber outside the ball makes the latter come against the annular seal, thus obtaining total watertight sealing.

Another way to achieve the communication between both chambers is by making a hole or channel in the retainer itself which isolates said outer chamber, since this retainer is the element on which the ball sits on the side opposite the radial outlet of the valvular body.

This communication passage between both chambers can also be obtained by means of a hole or notch made in the wall itself of the valvular body, under the retainer. This hole or notch can be perfectly made fromthe side corresponding to the fluid inlet.

In order to make it easier to understand the features of the invention and forming an integral part of this specifi- 1 1 1 1 i i 1 r - cation, some sheets of drawings are attached and in these figures the following has been represented in an illustra tive and non-restrictive manner:

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1.- It is a section of the ball-check valve for fluids, which includes the improvements object of the invention, in the open position.

Figure 2.- It is a sectioned view, similar to the one shown in figure 1, but in the closed position.

Figure 3.- It is a sectioned view similar to the one shown in figure 2, according to a variation of embodiment of the invention.

Figure 4.- It is another sectioned view, similar to the one shown in figure 2, but including a second variation of embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Making reference to the numbering that is indicated in the figures and specifically in connection with figure 1, we can see that the ball-check valves for fluids in which the improvements object of the present invention are centered, are made up of a series of elements known in themselves, responding to the following names and references:

Valvular body (1), drive shaft (2) of the valve, sealing ball (3), operating control or knob (4) and retainers (5) and (6.) When the valve is in the passing position, just as is shown in figure 1, the ball (3) of the valve has its elbowed passage (7) in total correspondence with the inlet (8) and outlet connection (9.) In this position there is no pressure in the inside of the ball (3), since the liquid flows freely towards the outside.

When the valve is in the closed position, as is shown in figure 2, the passing of the fluid is cut off from the inlet (8) towards the outlet (9), this position corresponding to the rotation of 90 degrees in terms of that shown in 1 figure 1. In this closed position the ball (3) is applied against the free edge of the retainer (5) or annual seal. The retainer (6) which occupies a position parallel to the seal (5) at the other side of the ball (3), is used to obtain gentle operation in the rotation of the sphere (3) and that occupies a centered position with regard to the shaft (2). The shaft (2) is indepedent from the ball (3) as is clearly seen in the figures, being interlocked in rotation upon the shank (10) being provided in the shaft (2) which is introduced in the notch of identical section existing in the ball (3.) The shaft (2) includes a pair of annular throats (11) where the corresponding theoretical joints which prevent the outflow of the fluid towards the outside, through the area occuplied by the knob (4) are housed.

Now then, with this arrangement which in itself is known, there is a chamber, specifically the one referred to cEsnumber (12) in the figures and which is situated -he fluid outlet, to which opposite the connection (9) of 11 pressure would not reach when the valve occupies the closed position, since this chamber (12) would remain isolated from the inlet (8) of the fluid, or with regards to the elbowed passage (7) of the inside of the ball (3.) This does not happen in figure 2 because there has already been a hole (13) made in the wall of the ball (3) in order to communicate precisely the inside with the outside of the ball, this being the object of the invention.

In accordance with the invention and precisely due to the presence of the hole (13) made radially in the wall of the ball in order to permit direct intake of fluid from the inside of the ball (3) and to flood under pressure the chamber (12) of the valve body (1), the pressure itself of this chamber moves slightly the ball (3) in order to apply it to pressure against the seat defined by the seal (5), thus avoiding leaks that are presently caused in the c i i i q 1.

is closed position of the valve.

Chamber (12) is limited by the wall (14) of the valve body (1), the ball itself (3) and the retainer (6.) Now making reference to figure 3, we can see in it that the ball (3) does not have the above cited hole (13), the fluid entering the chamber (12) through a notch or hole (15) made only in the retainer (6), with the identical task as that of the hole (13) of the wall of the ball (M In figure 4 one sees a variation of embodiment of the features of the invention, since the intake of fluid into the camber (12) takes place through the hole (16) made in the wall of the valve body (l.) The hole (16) can be easily made through the intake of the valve body (1), and it could also be replaced by a groove open to the inside of the valvular body (l.)

Claims

1.- Improvements in ball-check valves for fluids, with which leaks are avoided in the closed position of the valve and the former being of the square cock type with an elbowed passage in the ball (3) of the valve shaft, characterized because a direct communication is estab lished between the inside chamber (7) of the ball (3) and the outside one of the same, in the area diametrically opposite the outlet connection (9) where there is a retainer or seal (5) upon which the ball (3) sit s in the closed position, all in order for the pressure of the fluid to apply the ball (3) against the seal (5.) Improvements in ball-check valves for fluids, according to claim 1, in which the communication between both chambers (7, 12) is established by means of a hole (13) made in the wall of the ball (3) radially and perpendicular to the geometric axes of the emblowed passage (7), preferably.

3.- Improvements in ball-check valves for fluids, according to claim 1 in which the communication between both chambers (7, 12) is established by means of a hole or channel (15) made in the retainer (6) upon which the ball (3) sits on the other side of the seal (5.) 4.- Improvements in ball-check valves for fluids, according to claim 1, in which the communication between both chambers (7, 12) is established upon there being a hole or channel (16) in the wall itself of the valvular body (1), without affecting the retainer (6) on which the ball (3) sits on the other side of the seal (5.) Published 1992 at The Patent Office, Concept House, Cardiff Road, Newport. Gwent NP9 1RH. Further copies may be obtained from Sales Branch, Unit 6, Nine Mile Point, Cwmfelinfach, Cross Keys, Newport. NP1 7HZ. Printed by Multiplex techniques lid, St Mary Cray. Kent.

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