Title of Invention

AN ADJUSTABLE SEALINGS DEVICE FOR PREVENTING THE LEAKAGE OF A SUBSTANCE FROM A VALVE AND A VALVE ASSEMBLY

Abstract The present invention relates to rotary valves and to sealing means for such rotary valves. The present invention generally addresses the problem of sealing around the stem extending a rotary valve. The adjustable sealing means of present invention generally comprises a cam (65) mounted about the stem (26) of the valve (10) between the cover of the valve (10) and a seal assembly (38), the cam (65) being mounted for pressing engagement on the seal assembly (38) and for caming engagement with the cover. The cam (65) is configured for transforming a rotary movement thereof about a rotation axis into an axial movement thereof along that same axis. The adjustable sealing means also comprises an actuator (75) mounted to the cover and engaging the cam (65) for causing the rotary movement thereof. The adjustable sealing means is mainly used for sealing purposes on rotary valves and plug valves.
Full Text BACKGROUND
It is common and usual practice in sealing the top portion of rotary valves to use a
top seal that seals against media leakage while simultaneously accommodating
rotational movement of the valving element relative to a valve body. The valving
element of a rotary valve has a closure portion which is rotatably fitted within a valve
body. This closure portion of the valve is joined by a stem or shaft portion which
extends out of the valve body to interact with an actuator and transmit torque to the
closure portion. This torque is used to rotate the closure portion within the valve
body and to open or close a passageway in the valve.
In plug valves, it is common practice to seal the top of the valve with a centrally
apertured diaphragm with the shaft portion of the valve extending through the
central aperture of the top seal. The mechanism for the adjustment of plug valves
normally turns around the compression of two sealing parts to prevent leakage.
These mechanisms involve normally a plurality of tightening bolts or screws (usually
three but sometimes two).
Examples of such valves can be seen in U. S. Patents 3,235,272 (Smith); 4,159,818
and 4,475,713 (Reed et al.).
While all of the above mentioned sealing arrangements have been highly
satisfactory, they are not without their attendant disadvantages. For example, the
tightening bolts or screws often need to be screwed simultaneously to prevent
unwanted side loading on the system. Furthermore, these bolts or screws can be
difficult to access with tools, especially in case of toxic leakage. As a result, these
screws are rarely adjusted which reduces the effective life of the valve.


It is thus an object of the present invention to provide an adjustable stem sealing
means which uses a single screw that is positioned on the front of the cover for
easy access, and eliminating any interference with future automation devices to be
installed on the valve.
It is a further object of the present invention to provide a top valve adjustable seal
which provides for ease of adjustment when the valve is serviced in the field and
which does not require special tools.
It is yet another object of the present invention to provide plug valve adjustment
means which comprises a cam.
SUMMARY OF THE INVENTION
Our mechanism uses only one adjustment screw that is positioned on the front of
the cover for easy access. The force generated by the screw is transposed into a
vertical force and a horizontal force by a cam. The multiple faces of the cam are
used to transmit the force vertically and horizontally and will maintain the
mechanism in a straight position.
Preferably, the top of the cam is used to indicate its position. As the cam is rotated,
an arrow will point its position relative to the graduation on the cover. Also as the
cam is rotated its vertical motion downward can be used as an indication of the
adjustment measured by the part of the cam that is outside the cover, it indicates
the amount of compression that is left before the maximum compression is reached
(when the top face of the cam mates the top of the cover).
The base of the cam can be shaped to fit any type of seal or purpose; for example
an o-ring or a p-seal. The angle of the compression plate or the like can be varied
as needed to redistribute the compression in radial and axial direction on the seal.


BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Other objects and advantages of the invention will become apparent when reading
the following detailed description and upon reference to the drawings, in which:
Figure 1 is a perspective view of a plug valve made in accordance with the present
invention.
Figure 2 is a fragmentary perspective view of the plug valve shown in figure 1.
Figure 3 is a top view of the plug valve shown in figure 1.
Figure 4 is a partial top view of the plug valve shown in figure 1.
Figure 5 is a cross sectional view of the plug valve shown in figure 4.
Figure 6 is a perspective view of the cover and of the adjustment cam
(unassembled) of the plug valve shown in figure 1.
Figure 7 is a bottom perspective view of the cover and of the adjustment cam shown
in figure 6.
Figure 8 is a bottom perspective view of the cover and of the adjustment cam shown
in figure 6 (assembled and in a first position).
Figure 9 is a bottom perspective view of the cover and of the adjustment cam shown
in figure 6 (assembled and in a second position).


Figure 10 is a bottom perspective view of the cover and of the adjustment cam
shown in figure 6 (assembled and in a third position).
Figure 11 is a fragmentary cross sectional view of the cover and top seal of the plug
valve shown in figure 1.
Figure 12 is an exploded perspective view of an adjustable sealing device in
accordance with this invention.
Figure 13 is a top view of the adjustable sealing device shown in figure 12 in its
minimum (A), intermediary (B) and maximum (C) compression positions.
Figure 14 is a cross-sectional view of the adjustable sealing device shown in figure
13 in its minimum (A), intermediary (B) and maximum (C) compression positions.
Figure 15 is a partial perspective sectional view of the adjustable sealing device
shown in figure 13 in its minimum (A), intermediary (B) and maximum (C)
compression positions.
Figure 16 is a top view of the adjustment cam/screw shown in figure 12 in their
minimum (A), intermediary (B) and maximum (C) compression positions.
While the invention will be described in connection with a preferred embodiment, it
will be understood that it is not intended to limit the invention to that embodiment.
On the contrary, it is intended to coverall alternatives, modifications and equivalents
as may be included within the spirit and scope of the invention as defined by the
appended claims. More particularly, the invention, although mostly described in
relation to plug valves, is not limited thereto. It is applicable to any valve or any other
device having a stem or shaft extending from a body that requires an adjustable
seal.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings and to FIG. 1 and 2 in particular, a plug valve 10
constructed in accordance with the present invention is shown. The plug valve 10
includes a valve body 14 having an inlet 16 and an outlet 18 with an internal flow
passage 20 extending therebetween. A rotatable valving member 22 extends across
the internal flow passage 20 to selectively block fluid flow therethrough. This valving
member 22 is rotatably disposed within the valve body 14 of the illustrated
embodiment and has a plug portion 24 which extends across the flow passage 20.
A stem portion 26 of the rotatable valving member 22 is attached to the plug portion
24 to extend out of the valve body 14. Under normal circumstances, the stem
portion 26 is interconnected with an actuator (not shown, either manual or
automatic) which transmits a torque to the valving member 22 to effectuate relative
rotation of the valving member 22 relative to the valve body 14 along a rotational
axis 28. The plug portion 24 of the valving member 22 has a through opening or
passageway 30 therein, as is usual, to be placed in and out of registry with the
internal flow passage 20 incident to partial rotation of the valving member 22 about
the axis 28. In the illustration of FIG. 2, the valving member 22 is shown in an open
position. In this open position, the passageway 30 through the plug portion 24
registers with the internal flow passage 20. As should be readily apparent, the
valving member 22 is designed to be rotated about this axis 28 to place its through
passageway 30 out of registry with the valve housing's (14) internal flow passage 20
and to completely cut off flow through that internal flow passage 20.
A first or primary sealing member in the form of a sleeve or liner formed of a
fluorinated hydrocarbon polymeric material such as polytetrafluoroethylene, sold
under the trademark TEFLON, or equivalent material is preferably fitted about the


periphery of the plug portion 24 of the valving member 22 and is aperatured in
correspondency to that plug portion 24 to permit registry of the plug portions (24)
through passageway 30 with the internal flow passage 20 whenever valving member
22 is in the open position illustrated in FIG. 2. The sealing member is snugly fitted
on opposite sides of the internal flow passage 20 and provides a seal between the
plug portion 24 of the valving member 22 and the valve body 14.
As mentioned above, the stem or shaft portion 26 of the valving member 22 extends
out of the body 14. In the illustration of FIG. 2, this extension is through an opening
in the top of the valve body 14, and for purposes of the present description, this
opening will be referred to as a top opening (although the valve could clearly be
oriented differently). This top opening is covered with a top seal in a form of a
diaphragm 38 which is aperatured to accommodate the stem portion of the valving
member 22 which passes through the top seal/diaphragm 38. The top
seal/diaphragm 38 will initially be described as having been formed of a fluorinated
hydrocarbon polymer such as polytetrafluoroethylene or equivalent material.
However, as will be highlighted below, the design of the top seal 38 is such to permit
the use of a wide range of shapes and materials to meet a correspondingly wide
range of applications.
The top seal 38 and the cooperating components of the valve 10 with which it
interacts allow movement between the valve body 14 and the plug 22 to occur
without interrupting the sealing function provided by the top seal 38. Plug portion 22
has a taper from the top of the plug (proximal to stem 26) to the lower portion of the
plug (distal to the stem 26). This taper of the plug 26 allows for downward
adjustability of the plug by increasing the pressure of tightening bolt 75 which in turn
will apply pressure to the cam 65. Figure 6 downward adjustment of plug 22 relative
to the body 14 increases the service pressure of the valve 10, permitting use of
higher pressurized content without leakage. Increasing the surface pressure of the
valve also increases the torque required to rotate the plug 22 relative to the body 14.


As illustrated in Figure 11, tightening of the seal tightening cam 65 applies a
downward force on the thrust collar 50. This downward force is principally applied to
the obliquely oriented bearing surface 54 which, in turn, applies a force to the
rotatable valving member 22 in a direction substantially perpendicular to that of the
bearing surface 54. The result in the force applied to the rotating valving member 22
has two components, a first downward component and a second horizontal
component. The two resulting components of force urge the top seal 38 in sealing
engagement with both the stem portion 26 and the shoulder 80 of the rotatable
valving member.
Figures 12-16 show another embodiment of the invention. In this embodiment, a
stem sealing device 100 comprises a base 180, a seal 138, a thrust collar 150, a
cam 165, a cover 182 and a bolt or screw 175.
The base 180 may be replaced by a similarly configured portion of the body of the
object to be sealed. Bolts 188 are used to securely press the cover 182, the cam
165, the thrust collar 150 and the seal 138 to the base 180 and/or body.
The stem 126 is introduced in the central opening in the stem sealing device 100.
Then the bolt/screw 175 is tightened as needed.
Figures 13-16 show the stem sealing device 100 in its minimum (A), intermediary
(B) and maximum (C) compression positions.
Thus, it is apparent that there has been provided, in accordance with the invention,
a top seal that fully satisfies the objects, aims and advantages set forth above.
While the invention has been described in conjunction with a specific embodiment
thereof, it is evident that many alternatives, modifications, and variations will be
apparent to those skilled in the art in light of the foregoing description. Accordingly, it


is intended to embrace all such alternatives, modifications, and variations as fall
within the spirit and broad scope of the appended claims.

WE CLAIM :
1. An adjustable sealing device for preventing the leakage of a substance from
a valve (10) having a stem (26) extending outwardly therefrom, said sealing
device comprising a cover adapted to be mounted to said valve (10), a seal
assembly (38) adapted to be mounted around said stem (26), and a cam (65)
adapted to be mounted between said seal assembly (38) and said cover for
pressing engagement on said seal assembly (38) and for caming
engagement with said cover, said cam (65) being configured for transforming
a rotary movement thereof about a rotation axis (28) into an axial movement
thereof along said axis (28), and an actuator (75) coupled to said cover and
adapted to move linearly when rotated, wherein when said actuator (75) is
displaced toward said cam (65), said linear movement of said actuator (75)
induces a rotary movement of said cam (65) which is transformed into said
axial movement, said axial movement causing said cam (65) to press said
seal assembly (38) against said stem (26).
2. An adjustable sealing device as claimed in claim 1, wherein said actuator
(75) is a bolt or a screw.
3. An adjustable sealing device as claimed in claim 2, wherein said actuator
(75) is a single bolt or screw.
4. An adjustable sealing device as claimed in claim 1, wherein said sealing
device comprises a cam position indicator.
5. An adjustable sealing device as claimed in claim 1, wherein said valve (10) is
a plug valve.
6. A valve assembly (10) comprising:

a. a valve body (14) having a valve member (22) mounted therein for
rotation about an axis (28), said valve member (22) having a stem
(26) extending therefrom;
b. a cover mounted to said valve body (14) and having an aperture
through which said stem (26) can extend;
c. a seal assembly (38) mounted about said stem (26) in proximity of
said valve member (22) for preventing leakage therefrom;
d. a cam (65) mounted about said stem (26) between said seal
assembly (38) and said cover for pressing engagement on said seal
assembly (38) and for caming engagement with said cover, said cam
(65) being configured for transforming a rotary movement thereof
about said axis (28) into an axial movement thereof along said axis
(28);
e. an actuator (75) threadedly coupled to said cover for engagement with
said cam (65), said actuator (75) moving linearly when rotated;
wherein when said actuator (75) is threaded toward said cam (65), said
linear movement of said actuator (75) induces a rotary movement of said
cam (65) which is transformed into said axial movement, said axial
movement causing said cam (65) to press said seal assembly (38)
against said valve member (22).
7. A valve assembly as claimed in claim 6, wherein said seal assembly (38)
comprises a seal and a thrust collar.
8. A valve assembly as claimed in claim 6, wherein said actuator (75) is a screw
or a bolt.
9. A valve assembly as claimed in claim 6, wherein said actuator (75) is a single
screw or a single bolt.

10. A valve assembly as claimed in claim 6, wherein said valve assembly (10)
comprises a cam position indicator.
11. A valve assembly as claimed in claim 6, wherein said valve (10) is a plug
valve.


The present invention relates to rotary valves and to sealing means for such
rotary valves. The present invention generally addresses the problem of sealing
around the stem extending a rotary valve. The adjustable sealing means of present
invention generally comprises a cam (65) mounted about the stem (26) of the valve
(10) between the cover of the valve (10) and a seal assembly (38), the cam (65)
being mounted for pressing engagement on the seal assembly (38) and for caming
engagement with the cover. The cam (65) is configured for transforming a rotary
movement thereof about a rotation axis into an axial movement thereof along that
same axis. The adjustable sealing means also comprises an actuator (75) mounted
to the cover and engaging the cam (65) for causing the rotary movement thereof.
The adjustable sealing means is mainly used for sealing purposes on rotary valves
and plug valves.

Documents:

01036-kolnp-2006 abstract.pdf

01036-kolnp-2006 claims.pdf

01036-kolnp-2006 correspondence others.pdf

01036-kolnp-2006 description (complete).pdf

01036-kolnp-2006 drawings.pdf

01036-kolnp-2006 form-1.pdf

01036-kolnp-2006 form-3.pdf

01036-kolnp-2006 form-5.pdf

01036-kolnp-2006 international publication.pdf

01036-kolnp-2006 international search authority report.pdf

01036-kolnp-2006 others.pdf

01036-kolnp-2006 pct form.pdf

01036-kolnp-2006-assignment.pdf

01036-kolnp-2006-correspondence others-1.1.pdf

01036-kolnp-2006-correspondence-1.2.pdf

01036-kolnp-2006-form-18.pdf

01036-kolnp-2006-form-3-1.1.pdf

01036-kolnp-2006-priority document-1.1.pdf

1036-kolnp-2006-abstract 1.1.pdf

1036-KOLNP-2006-ABSTRACT.pdf

1036-kolnp-2006-amanded claims 1.1.pdf

1036-KOLNP-2006-AMANDED CLAIMS.pdf

1036-KOLNP-2006-ASSIGNMENT.1.3.pdf

1036-kolnp-2006-assignment.pdf

1036-kolnp-2006-correspondence 1.2.pdf

1036-KOLNP-2006-CORRESPONDENCE-1.1.pdf

1036-KOLNP-2006-CORRESPONDENCE.1.3.pdf

1036-KOLNP-2006-CORRESPONDENCE.pdf

1036-kolnp-2006-correspondence1.3.pdf

1036-kolnp-2006-description (complete) 1.1.pdf

1036-KOLNP-2006-DESCRIPTION (COMPLETE).pdf

1036-kolnp-2006-drawings 1.1.pdf

1036-KOLNP-2006-DRAWINGS.pdf

1036-KOLNP-2006-EXAMINATION REPORT.1.3.pdf

1036-kolnp-2006-examination report.pdf

1036-kolnp-2006-form 1-1.1.pdf

1036-KOLNP-2006-FORM 1.pdf

1036-KOLNP-2006-FORM 13.1.3.pdf

1036-kolnp-2006-form 13.1.pdf

1036-KOLNP-2006-FORM 13.pdf

1036-KOLNP-2006-FORM 18.1.3.pdf

1036-kolnp-2006-form 18.pdf

1036-kolnp-2006-form 2-1.1.pdf

1036-KOLNP-2006-FORM 2.pdf

1036-KOLNP-2006-FORM 3.1.3.pdf

1036-kolnp-2006-form 3.1.pdf

1036-KOLNP-2006-FORM 3.pdf

1036-KOLNP-2006-FORM 5.1.3.pdf

1036-kolnp-2006-form 5.pdf

1036-KOLNP-2006-FORM-27.pdf

1036-KOLNP-2006-GPA.1.3.pdf

1036-kolnp-2006-gpa.pdf

1036-kolnp-2006-granted-abstract.pdf

1036-kolnp-2006-granted-claims.pdf

1036-kolnp-2006-granted-description (complete).pdf

1036-kolnp-2006-granted-drawings.pdf

1036-kolnp-2006-granted-form 1.pdf

1036-kolnp-2006-granted-form 2.pdf

1036-KOLNP-2006-GRANTED-LETTER PATENT.pdf

1036-kolnp-2006-granted-specification.pdf

1036-kolnp-2006-others 1.1.pdf

1036-KOLNP-2006-OTHERS.1.3.pdf

1036-KOLNP-2006-OTHERS.pdf

1036-kolnp-2006-others1.2.pdf

1036-KOLNP-2006-PETITION UNDER RULE 137.pdf

1036-KOLNP-2006-REPLY TO EXAMINATION REPORT.1.3.pdf

1036-KOLNP-2006-REPLY TO EXAMINATION REPORT.pdf

1036-kolnp-2006-reply to examination report1.1.pdf

abstract-01036-kolnp-2006.jpg


Patent Number 248184
Indian Patent Application Number 1036/KOLNP/2006
PG Journal Number 26/2011
Publication Date 01-Jul-2011
Grant Date 27-Jun-2011
Date of Filing 21-Apr-2006
Name of Patentee FLUOROSEAL INC.
Applicant Address 6418, TRANS-CANADA HIGHWAY WEST, MONTREAL, QUEBEC H4T 1X4
Inventors:
# Inventor's Name Inventor's Address
1 PAUL, NICOLAS 205, JEANNE-HAYET, VARENNES, QUEBEC J3X 1V1
PCT International Classification Number F16J 15/02
PCT International Application Number PCT/CA2004/001890
PCT International Filing date 2004-10-28
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 2,486,008 2004-10-28 Canada
2 2,447,866 2003-10-31 Canada