GB2137735A

GB2137735A - Ball valve

Info

Publication number: GB2137735A
Application number: GB08324480A
Authority: GB
Inventors: Dijk Lambertus Jacobus Van
Original assignee: VSH FABRIEKEN NV
Current assignee: VSH FABRIEKEN NV
Priority date: 1982-10-15
Filing date: 1983-09-13
Publication date: 1984-10-10
Also published as: GB8324480D0; NL193670B; NL193670C; FR2534657B1; NL8203988A; GB2137735B; DE3333518A1; BE897896A; FR2534657A1

Abstract

A ball valve has a housing 1, in which a bearing consisting of two bearing halves is provided for forming an accommodation space, in which a ball 6 is provided, which can be rotated by means of an operating means 9 projecting from the casing, said ball being provided with a passage channel 7, said two bearing halves each consisting of an essentially disk-shaped part 12 of a somewhat deformable material, such as polytetrafluorethylene, and an essentially disk-shaped part 13 of a more elastic material, such as rubber. <IMAGE>

Description

SPECIFICATION Ball valve The invention relates to a ball valve with a housing, in which a bearing consisting of two bearing halves is provided for forming an accomodation space, in which a ball is provided, which can be rotated by means of an operating means projecting from the casing and which ball is provided with a passage channel for establishing or interrupting the connection between the inlet and outlet channels of the housing, the bearing halves consisting of slightly deformable material, such as polytetrafluorethylene and being able to be pressed against one another and against the ball by means of at least one pressure piece.

Such a ball valve is known from Dutch Patent Application 69 12 753, laid open for inspection.

With this known valve the centre lines of the inlet and outlet channels are in line with each other.

When the ball closes the passage channel, it is pressed by the pressure which the medium exerts on the one side of the ball, against the opposite bearing half so that a good sealing is obtained.

In another embodiment of such a ball valve, this does not have to be the case and it has appeared that then the surface pressure between the ball and the bearing halves must be increased so high, that already after a short time flow of the material of the bearing occurs and a good sealing is no longer obtained.

According to the invention it is therefore provided that the passage channel turns through a right angle in the ball, the one leg of the channel being in line with the outwards projecting operating means, the two bearing halves consist each of an essentially disk-shaped part of the somewhat deformable material, such as polytetrafluorethylene, and an essentially diskshaped part of a more elastic material, such as rubber.

It has appeared, surprisingly, that with such a combination a good sealing is obtained between the ball and the bearing halves, also that the locally smali dimensions of the contact surface between the parts, whereas still an easy rotation of the ball in the accomodation space is possible.

The latter, namely, is not the case when the bearing halves consist entirely of a more elastic material, such as rubber, whereas in case of a manufacture entirely of polytetrafluorethylene, the surface pressure between the parts must be increased to such an extent, in order to obtain a good sealing, that the polytetrafluorethylene begins to flow after some time and no sealing is present at all.

A passage channel which turns a right angle will be used in particular in a two-way valve, in which the channels of the casing which are in line with each other, are outlet channels and the channel provided at a right angle thereto is an outlet channel, or vice versa.

With the ball valve according to the present invention, the disk-shaped parts, made of somewhat deformable material, of the two bearing halves will preferably be closest to each other, so that they are loaded by means of the disk-shaped parts of the more elastic material and are pressed against each other and against the ball through these parts by the pressure pieces.

The of course also the two disk-shaped parts of the more elastic material will be pressed against the ball.

The invention will now be explained by means of an example of an embodiment, shown in the drawing, in which: Figure 1 shows a section of a two-way valve and more precisely along a plane passing through the centre lines of the inlet channel and of the two outlet channels; and Figure 2 shows a section along the line Il-Il of Figure 1.

The valve shown in the drawing comprises a housing 1 with an inlet channel 2 therein, the housing being closed off at the ends by means of two pressure pieces 3, in each of which is an outlet channel 4. The pressure pieces 3 are secured to the housing by means of tap bolts 5.

Within the housing is provided the ball 6 with a right angled passage channel 7 therein. The ball 6 is provided with a rod 8, on which an operating lever 9 is mounted, which is connected with the rod 8 by means of a locking pin 10. The rod 8 is sealed with regard to the housing 1 by means of a rubber O-ring 11.

The ball 6 is accomodated between two essentially disk-shaped parts 12 of a somewhat resilient material, such as especially polytetrafluorethylene, against which lie other disk-shaped parts 1 3 of a more elastic material, such as rubber. The parts 1 2 and 1 3 are pressed against the ball 6 in a known way by means of the pressure pieces 3. In order to prevent the surface pressure between the parts 1 2 and 1 3 and the ball 6 from exceeding a certain value, the rubber parts 13 may be provided with cavities 14.

In the position of the valve shown in Figure 1, a medium will be supplied in general to the inlet channel 2 and be drained off via the left-hand outlet channel 4, so that the medium will flow in the direction of the arrows P. When the ball 6 is turned over 900 by means of the lever 9, the valve will be closed and when turned another 900, the medium will be drained off through the right-hand outlet channel 4 in order to be transported to another place.

It will be obvious, of course, that the two channels 4 can also serve as inlet channels and the inlet channel 2 as an outlet channel, so that e.g. two different mediums can be supplied to one single place, or possibly one and the same medium from two different places.

All these and further possibilities, however, will be obvious to the expert and need no further explanation.

1. Ball valve with a housing, in which a bearing consisting of two bearing halves is provided for forming an accomodation space, in which a ball is

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Ball valve The invention relates to a ball valve with a housing, in which a bearing consisting of two bearing halves is provided for forming an accomodation space, in which a ball is provided, which can be rotated by means of an operating means projecting from the casing and which ball is provided with a passage channel for establishing or interrupting the connection between the inlet and outlet channels of the housing, the bearing halves consisting of slightly deformable material, such as polytetrafluorethylene and being able to be pressed against one another and against the ball by means of at least one pressure piece. Such a ball valve is known from Dutch Patent Application 69 12 753, laid open for inspection. With this known valve the centre lines of the inlet and outlet channels are in line with each other. When the ball closes the passage channel, it is pressed by the pressure which the medium exerts on the one side of the ball, against the opposite bearing half so that a good sealing is obtained. In another embodiment of such a ball valve, this does not have to be the case and it has appeared that then the surface pressure between the ball and the bearing halves must be increased so high, that already after a short time flow of the material of the bearing occurs and a good sealing is no longer obtained. According to the invention it is therefore provided that the passage channel turns through a right angle in the ball, the one leg of the channel being in line with the outwards projecting operating means, the two bearing halves consist each of an essentially disk-shaped part of the somewhat deformable material, such as polytetrafluorethylene, and an essentially diskshaped part of a more elastic material, such as rubber. It has appeared, surprisingly, that with such a combination a good sealing is obtained between the ball and the bearing halves, also that the locally smali dimensions of the contact surface between the parts, whereas still an easy rotation of the ball in the accomodation space is possible. The latter, namely, is not the case when the bearing halves consist entirely of a more elastic material, such as rubber, whereas in case of a manufacture entirely of polytetrafluorethylene, the surface pressure between the parts must be increased to such an extent, in order to obtain a good sealing, that the polytetrafluorethylene begins to flow after some time and no sealing is present at all. A passage channel which turns a right angle will be used in particular in a two-way valve, in which the channels of the casing which are in line with each other, are outlet channels and the channel provided at a right angle thereto is an outlet channel, or vice versa. With the ball valve according to the present invention, the disk-shaped parts, made of somewhat deformable material, of the two bearing halves will preferably be closest to each other, so that they are loaded by means of the disk-shaped parts of the more elastic material and are pressed against each other and against the ball through these parts by the pressure pieces. The of course also the two disk-shaped parts of the more elastic material will be pressed against the ball. The invention will now be explained by means of an example of an embodiment, shown in the drawing, in which: Figure 1 shows a section of a two-way valve and more precisely along a plane passing through the centre lines of the inlet channel and of the two outlet channels; and Figure 2 shows a section along the line Il-Il of Figure 1. The valve shown in the drawing comprises a housing 1 with an inlet channel 2 therein, the housing being closed off at the ends by means of two pressure pieces 3, in each of which is an outlet channel 4. The pressure pieces 3 are secured to the housing by means of tap bolts 5. Within the housing is provided the ball 6 with a right angled passage channel 7 therein. The ball 6 is provided with a rod 8, on which an operating lever 9 is mounted, which is connected with the rod 8 by means of a locking pin 10. The rod 8 is sealed with regard to the housing 1 by means of a rubber O-ring 11. The ball 6 is accomodated between two essentially disk-shaped parts 12 of a somewhat resilient material, such as especially polytetrafluorethylene, against which lie other disk-shaped parts 1 3 of a more elastic material, such as rubber. The parts 1 2 and 1 3 are pressed against the ball 6 in a known way by means of the pressure pieces 3. In order to prevent the surface pressure between the parts 1 2 and 1 3 and the ball 6 from exceeding a certain value, the rubber parts 13 may be provided with cavities 14. In the position of the valve shown in Figure 1, a medium will be supplied in general to the inlet channel 2 and be drained off via the left-hand outlet channel 4, so that the medium will flow in the direction of the arrows P. When the ball 6 is turned over 900 by means of the lever 9, the valve will be closed and when turned another 900, the medium will be drained off through the right-hand outlet channel 4 in order to be transported to another place. It will be obvious, of course, that the two channels 4 can also serve as inlet channels and the inlet channel 2 as an outlet channel, so that e.g. two different mediums can be supplied to one single place, or possibly one and the same medium from two different places. All these and further possibilities, however, will be obvious to the expert and need no further explanation. CLAIMS

1. Ball valve with a housing, in which a bearing consisting of two bearing halves is provided for forming an accomodation space, in which a ball is provided, which can be rotated by means of an operating means projecting from the casing and which ball is provided with a passage channel for establishing or interrupting the connection between the inlet and outlet channels of the housing, the bearing halves consisting of slightly deformable material, such as polytetrafluorethylene and being able to be pressed against one another and against the bail by means of at least one pressure piece, the passage channel turning through a right angle in the ball, the one leg of the channel being in line with the outwards projecting operating means, the two bearing halves consisting each of an essentially disk-shaped part of the somewhat deformable material, such as polytetrafluorethylene, and an essentially diskshaped part of a more elastic material, such as rubber.

2. Ball valve according to claim 1, wherein the disk-shaped parts which consist of the somewhat deformable material, such as polytetrafluorethylene, of the two bearing halves are the closes to one another.