GB1598477A

GB1598477A - Valve

Info

Publication number: GB1598477A
Application number: GB24383/78A
Authority: GB
Original assignee: Kitamura Valve Manufacturing Co Ltd
Current assignee: Kitamura Valve Manufacturing Co Ltd
Priority date: 1977-06-06
Filing date: 1978-05-30
Publication date: 1981-09-23
Also published as: IT7824257A0; IT7822038V0; CA1096355A; DE2824824A1; AU3659478A; FR2393995B1; IT1095196B; BE867794A; FR2393995A1; NL171741C; DE2824824C2; JPS541431A; NL7806101A

Description

(54) VALVE (71) We, KITAMURA VALVE SEIZO KABUSHIKI KAISHA, a Japanese corporation of 7-12-5 Nishiogu, Arakawa-ku, Tokyo, Japan, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in the following statement: This invention relates to an eccentrically rotatable valve for controlling fluid flow, and particularly relates to improvements in a no-flange-type eccentrically rotatable valve.

Many valves of this kind have been developed heretofore. For example, there is shown a horizontal cross section of a conventional eccentric rotary valve in Figure 1, in which a valve disk 11 is eccentrically pivoted within a valve body 14 by means of a valve stem 12 in a valve chamber 10 of the valve body 14 so that the center line of the disk 11 coincides with that of the flow path through the valve body 14 when the disk 11 is brought into the fully closed contact position, while the pivot axis of the valve stem 12 is offset from the center line.

However, the valve described above is not without defects. For instance. such a construction involves the provision of a bearing hole 16 of a bonnet 15 for pivotally supporting the stem 12 eccentrically disposed to correspond with the eccentrically disposed to correspond with the eccentrically rotatable disk 11. and accordingly the manufacture of the valve body 14 is complicated.

Further, when the valve is mounted between pipes for actual operation, it is inserted between the flanges attached to the ends of the pipes and is fixed by bolts 17 passed through the two flanges of the pipes.

In this case. however. since the bonnet 15 is arranged in an offset position in the valve body 14, as described above, one of the bolts 17 will be obstructed by the bonnet 15.

In order to overcome this problem the valve body 14 has to be provided with a pair or lug members 18 in its end portions, through which short bolts are passed for mounting the valve to the pipes avoiding the bonnet 15. Consequently, the construction of the valve is made even more complicated and its mounting operation is also rather troublesome.

The invention seeks to provide an improved eccentrically rotatable valve substantially free from the above-mentioned defects. The invention also seeks to provide an improved no-flange-type eccentrically rotatable valve which has a simple construction and is readily mounted for operation between pipes.

According to the present invention there is provided an eccentrically rotatable valve comprising: a valve body having a valve chamber and plurality of flow path openings which lead to the valve chamber; a deformable valve seat member having an internal seating surface, which is arranged in one of the flow path openings; an annular retainer engaging with the inner surface of said one opening and being fastened thereto by threaded means for bearing against said valve member in substantially abutting relationship and for maintaining said valve seat member in place; a valve stem having an axis passing through the center of the valve chamber, and being pivotally mounted to the valve body; and a valve disk having an external seating surface fixedly mounted to the valve stem and adapted to rotate with the stem so that in one position the external seating surface forms a proper contact with the internal seating surface of said deflectable valve seat member; characterised in that the central axis of said valve disk being perpendicular to the plane of the external seating surface of said valve disk and not intersecting the axis of rotation of said valve stem; and wherein an annular chamfered portion is provided between the outer end of said seat member of the inner end of said annular retainer so as to allow for clearance between the abutting surfaces and allow for the bending or deflecting tolerance of said valve seat member which in operation tends to be deformed into the spacing formed by said chamfered portion when said valve disk is seated in said mternal seating surfaces of said valve seat member, whereby reliable contact pressure is maintained between the seated valve disk and the seat member.

The present invention will now be described in detail in terms of several embodiments thereof illustrated in the accompanying drawings, which are given by way of illustration only and thus are not limitative of the present invention, in which: Figure I is a horizontal central section of a conventional eccentric rotary valve; Figure 2 is a vertical central section of an embodiment of an eccentrically rotatable valve according to the present invention Figure 3 is a horizontal central section of the eccentrically rotatable valve of Figure 2; Figure 4 is a horizontal central section of an other embodiment of a seat ring used in an eccentrically rotatable valve according to the present invention; and Figure 5 is a horizontal central section of another embodiment of the eccentrically rotatable valve according to the present invention.

In Figures 2 ansd 3 is shown an embodiment of an eccentrically rotatable valve of the present invention. A valve body 21 having a substantially spherical valve chamber 22 provides a pair of circular flow path openings 23 and 24 in its opposite ends, which lead to the chamber 22.

A seat ring 25 which forms a part of the wall of the chamber 22 and includes a flow path hole which leads to the chamber 22, is coaxially disposed in the opening 23, held by an annular retainer 26 by engaging the threaded outer surface of the retainer 26 with the threaded inner surface of the opening 23 in the valve body. The flange portion 25a of the seat ring 25 is interposed between the annular retainer 26 and the shoulder portion 27 of the valve body 21.

The seat ring 25 may be made of any suitable metallic material or plastic material such as tetrafluoroethylene.

The retainer 26 is provided with annular chamfered portion 28 around its inner end so as to allow for the bending tolerance of the seat ring 25.

The inner end portion 25b of the seat ring 25 projects into chamber 22 from the opening 23. A spherical seating surface 25c is formed in the inner end portion 25b of the seat ring 25.

The plane of the inner end portion 25b of the seat ring 25 is inclined at an angle a to the mounting plane of the flange 25a of the seat ring 25; that is, at an angle a to the planes of the mating surfaces of the valve and the pipes. Accordingly the central axis X - X of the seating surface 25c, that is, the line perpendicular to the plane of the inner end portion 25b passing through the center of the inner end portion 25b, is inclined at an angle a to the central axis Y - Y of the valve, which contains a central point 0 of the axis of rotation of a valve stem 31.

Other embodiments of the seat ring are shown in Figure 4. The seat ring 25 shown in Figure 4 has a flexible coupling portion 25d between the flange portion 25a and the seat portion, so that the seat ring 25 may move flexibly via the flexible coupling portion 25d. An annular chamfered or recessed portion 28 is provided between the retainer 26 and the seat ring 25 to facilitate this movement.

Referring again to Figures 2 and 3, the valve disk 29 is mounted to the valve stem 31 in its eccentric position in the valve chamber 22, via a disk arm 30 which is integrally coupled to the valve disk 29.

When the disk 29 is pivoted to the fully closed contact position, and an outer spherical seating surface 29a of the disk 29 is contacted with the inner spherical seating surface 25c of the seat ring 25, the central axis of the disk 29 is inclined at an angle a to the central axis Y - Y of the valve.

The valve stem 31, as shown in Figure 2, is pivotally arranged in the valve chamber 22 of the valve body 21. The upper portion of the stem 31 is rotatably received into a bearing 34 mounted in a cylindrical bonnet 32 and the lower end portion of the stem 31 is rotatably received into a lower bearing 35 mounted in a bearing recess 33.

The central axis of the bonnet 32 is perpendicular to the central axis Y - Y of the valve and passes through the center 0 of the valve chamber 22 Hence, the central axis of the stem 31 coaxially fitted into the bonnet 32 is also perpendicular to the central axis of the circular openings 23 and 24 and passes through the center 0 of the valve chamber 22. Thus, the disk 29 mounted on the stem 31 pivots about a central axis of the valve body 21.

Between the stem 31 and the bonnet 32, above the bearing 34 are inserted a tubular spacer 36, a packing means 37 above the spacer 36, and a packing stop member 38 above the packing means 37. A stop plate 39 is fixed to a flange 40 of the bonnet 32 above and outside of the packing stop member 38 by screw means 41 such as bolts and nuts.

The top end of the stem 31 projects above the bonnet 32 and a handle (not shown) may be mounted to it. A stop pin 43 prevents the stem 31 from coming out upwards from the valve body 21.

When the valve is to be mounted for operation between two pipes, a plurality of fixing bolts 42 are threaded through holes in the flanges of the two pipes and around the outside of the valve body 21 to hold the two pipes to the valve.

The fully open position of the disk 29 is shown in Figure 3 by the two-dotted lines.

From this position, the disk 29 is pivoted to the seat ring 25 by rotating the stem 31, as shown by an arrow. While the disk 29 is turning, the seating surface 29a of the disk 29 does not contact the seating surface 25c of the seat ring 25. Then the seating surface 29a of the disk 29 is brought into contact with the seating surface 25c, and as the disk is further pivoted, both the surfaces 25c and 29a are brought into full contact with each other due to the eccentric pivot center of the arm 30 of the disk 29, as shown in Figure 3 by the solid lines.

The seat ring 25 is permitted to bend by the chamfered portion 28 of the retainer 26, as described above. and the surfaces 25c and 29a are flexibly contacted with each other, thereby obtaining a reliable contact pressure therebetween.

In the embodiment shown in Figure 4, when the disk 29 is brought into contact with the seat ring 25, the surfaces 25c and 29a are held in proper contact with each other by the pivoting force through the flexible coupling portion 25d.

On the other hand, if the stem 31 is rotated in the reverse direction from the closed position, the contact pressure between the surfaces 25c and 29a is gradually decreased and the surfaces 25c and 29a are separated each other to the open position in the reverse manner of that described above.

In a valve according to the present invention, since the stem 31, the bonnet 32 and the bearing hole 33 are positioned on the center line of the chamber 22, no eccentric processing is necessary in the construction of the body 21, which thus may be manufactured very much easier than a conventional one. Further, when this valve is to be mounted between the flanges of the flow pipes, since the stem 31 and the bonnet 32 are arranged radially with respect to the valve body 21. the fixing bolts may be properly arranged in the flanges so that no fixing bolt is obstructed by the bonnet 32.

Consequently, no lug member is necessary on the valve body for avoiding the obstruction of a bolt by the bonnet.

The seat ring 25 provided with an inclined spherical internal seating surface 25c is easily mounted, the valve construction is very simple, and accordingly the manufacturing process is very straightforward.

Furthermore, the fixing operation of the valve between the flanges is easily performed.

In Figure 5, there is shown another embodiment of the eccentrically rotatable valve of the present invention. This embodiment has the same construction as that described above except that the seating surface 25c of the seat ring 25 is not inclined but parallel to the plane perpendicular to the central axis of the chamber 22 or of the seat ring 29 and that the central line X - X of the seating surface 25c is parallel to the axis Y - Y of the chamber 22 and is displaced a certain distance from the axis Y - Y when the seating surface 29a of the valve disk 29 is brought into fully closed contact with the seating surface 25c of the seat ring 25.

In this embodiment, it is apparent that the same results as described above can be obtained.

WHAT WE CLAIM IS: 1. An eccentrically rotatable valve consisting of: a valve body having a valve chamber and plurality of flow path openings which lead to the valve chamber; a deformable valve seat member having an internal seating surface, which is arranged in one of the flow path openings; an annular retainer engaging with the inner surface of said one opening and being fastened thereto by threaded means for bearing against said valve member in substantially abutting relationship and for maintaining said valve seat member in place; a valve stem having an axis passing through the center of the valve chamber, and being pivotally mounted to the valve body; and a valve disk having an external seating surface fixedly mounted to the valve stem and adapted to rotate with the stem so that in one position the external seating surface forms a proper contact with the internal seating surface of said deflectable valve seat member; characterised in that the central axis of said valve disk being perpendicular to the plane of the external seating surface of said valve disk and not intersecting the axis of rotation of said valve stem; and wherein an annular chamfered portion is provided between the outer end of said seat member and the inner end of said annular retainer so as to allow for clearance between the abutting surfaces and allow for the bending or deflecting tolerance of said valve seat member which in operation tends to be deformed into the spacing formed by said chamfered portion when said valve disk is

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. by screw means 41 such as bolts and nuts. The top end of the stem 31 projects above the bonnet 32 and a handle (not shown) may be mounted to it. A stop pin 43 prevents the stem 31 from coming out upwards from the valve body 21. When the valve is to be mounted for operation between two pipes, a plurality of fixing bolts 42 are threaded through holes in the flanges of the two pipes and around the outside of the valve body 21 to hold the two pipes to the valve. The fully open position of the disk 29 is shown in Figure 3 by the two-dotted lines. From this position, the disk 29 is pivoted to the seat ring 25 by rotating the stem 31, as shown by an arrow. While the disk 29 is turning, the seating surface 29a of the disk 29 does not contact the seating surface 25c of the seat ring 25. Then the seating surface 29a of the disk 29 is brought into contact with the seating surface 25c, and as the disk is further pivoted, both the surfaces 25c and 29a are brought into full contact with each other due to the eccentric pivot center of the arm 30 of the disk 29, as shown in Figure 3 by the solid lines. The seat ring 25 is permitted to bend by the chamfered portion 28 of the retainer 26, as described above. and the surfaces 25c and 29a are flexibly contacted with each other, thereby obtaining a reliable contact pressure therebetween. In the embodiment shown in Figure 4, when the disk 29 is brought into contact with the seat ring 25, the surfaces 25c and 29a are held in proper contact with each other by the pivoting force through the flexible coupling portion 25d. On the other hand, if the stem 31 is rotated in the reverse direction from the closed position, the contact pressure between the surfaces 25c and 29a is gradually decreased and the surfaces 25c and 29a are separated each other to the open position in the reverse manner of that described above. In a valve according to the present invention, since the stem 31, the bonnet 32 and the bearing hole 33 are positioned on the center line of the chamber 22, no eccentric processing is necessary in the construction of the body 21, which thus may be manufactured very much easier than a conventional one. Further, when this valve is to be mounted between the flanges of the flow pipes, since the stem 31 and the bonnet 32 are arranged radially with respect to the valve body 21. the fixing bolts may be properly arranged in the flanges so that no fixing bolt is obstructed by the bonnet 32. Consequently, no lug member is necessary on the valve body for avoiding the obstruction of a bolt by the bonnet. The seat ring 25 provided with an inclined spherical internal seating surface 25c is easily mounted, the valve construction is very simple, and accordingly the manufacturing process is very straightforward. Furthermore, the fixing operation of the valve between the flanges is easily performed. In Figure 5, there is shown another embodiment of the eccentrically rotatable valve of the present invention. This embodiment has the same construction as that described above except that the seating surface 25c of the seat ring 25 is not inclined but parallel to the plane perpendicular to the central axis of the chamber 22 or of the seat ring 29 and that the central line X - X of the seating surface 25c is parallel to the axis Y - Y of the chamber 22 and is displaced a certain distance from the axis Y - Y when the seating surface 29a of the valve disk 29 is brought into fully closed contact with the seating surface 25c of the seat ring 25. In this embodiment, it is apparent that the same results as described above can be obtained. WHAT WE CLAIM IS:

1. An eccentrically rotatable valve consisting of: a valve body having a valve chamber and plurality of flow path openings which lead to the valve chamber; a deformable valve seat member having an internal seating surface, which is arranged in one of the flow path openings; an annular retainer engaging with the inner surface of said one opening and being fastened thereto by threaded means for bearing against said valve member in substantially abutting relationship and for maintaining said valve seat member in place; a valve stem having an axis passing through the center of the valve chamber, and being pivotally mounted to the valve body; and a valve disk having an external seating surface fixedly mounted to the valve stem and adapted to rotate with the stem so that in one position the external seating surface forms a proper contact with the internal seating surface of said deflectable valve seat member; characterised in that the central axis of said valve disk being perpendicular to the plane of the external seating surface of said valve disk and not intersecting the axis of rotation of said valve stem; and wherein an annular chamfered portion is provided between the outer end of said seat member and the inner end of said annular retainer so as to allow for clearance between the abutting surfaces and allow for the bending or deflecting tolerance of said valve seat member which in operation tends to be deformed into the spacing formed by said chamfered portion when said valve disk is

seated in said internal seating surfaces of said valve seat member, whereby reliable contact pressure is maintained between the seated valve disk and the seat member.

2. An eccentrically rotatable valve according to claim 1, wherein the valve seat member is connected integrally to the valve body.

3. An eccentrically rotatable valve according to claim 1, wherein the valve seat member is a seat ring.

4. An eccentrically rotatable valve according to claim 2 or 3, in which the valve body further comprises face portions around each of the flow openings adapted to mate with corresponding surfaces of pipes to which the valve is to be connected, and in which the plane of said internal seating surface is inclined at an angle to the plane of the face portion around the flow path opening in which said internal seating surface is located.

5. An eccentrically rotatable valve according to claim 2 or 3, in which the valve body further comprises face portions around each of the flow path openings adapted to mate with corresponding surfaces of pipes to which said valve is to be connected, and in which the plane of said inner internal seating surface is parallel to the plane of said face portion around the flow path opening in which said internal seating surface is displaced from the plane passing through the axis of said valve stem and perpendicular to said face portion around the flow path opening in which said internal seating surface is located.

6. An eccentrically rotatable valve substantially as hereinbefore described with reference to and as illustrated in Figures 2 and 3, 4, or 5 of the accompanying draw ings.