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Патент USA US3091480

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May 28, 1963
3,091,470
C. E. ANDERSON ETAL
PRESSURE LOADED BONNET ASSEMBLY
Filed July 1, 1960
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INVENTORJ
ZIMW
ATTO/P/VEV
United States Patent 0
3;‘d-91A7il‘
Patented May 28, 1963
1
2
3,091,470‘
closure member forcing it axially inward to mash the
seal ring into intimate contact with the wall of the open
ing and closure member to establish the initial seal. The
PRESSURE LOADED BONNET ASSEMELY'
Clifford E. Anderson and Louis F. Eckert, Jra, Houston,
Tex., assignors to ACE Industries, Incorporated, New
York, N .Y., a corporation of New Jersey
Filed July 1, 1966}, Ser. No. 40,417
16 Claims. (til. 277-739)
This invention relates generally to a closure assembly
closure member may be provided with means to limit
its axial inward movement. The relationship‘ of the
closure member and retaining means is so proportioned
that in the event of loss of the packing material the
closure member can move up only the distance it took
to establish the initial seal, which is not suf?cient to
for pressure vessels and more particularly to ‘a bonnet 10 permit the seal ring from ‘becoming disengaged from its
assembly ‘for valves having a pressure actuated seal ring
in which the initial seal ‘for the seal ring is obtained
position between the wall of the opening and the closure
member since the ring will ?oat up due to the internal
by a hydraulic pressure exteriorly applied.
pressure in the body such distance and still maintain its
Most valves have an open ended valve chamber. The
seal.
opening to this chamber is closed by a ldisengageable 15
It is the object of the present invention to provide a
bonnet which permits entry into the chamber to make
closure assembly having a pressure actuated seal ring
necessary repairs to the valve mechanism. Many other
provided with an independent retaining means to re
pressure vessels have similar openings when entrance into
tain the closure member in the opening whereby the
necessity of precise concentricity of all elements is sub
the interior thereof must be available. While the most
stantially reduced.
common method of closing this opening has been to
have a ?anged bonnet bolted to a ?ange around the
It is another object to provide a closure assembly
opening \with suitable means between the ?anges of body
having a pressure actuated seal ring which is economical
and bonnet to effect a seal, such method is relatively
to manufacture and easy to assemble.
expensive to manufacture and time consuming to as
It is a further object to provide a closure assembly
semble and disassemble. Moreover, if a metallic seal 25 having a pressure actuated seal ring provided with an
independent retaining means for the closure member and
ring is used, it is necessary to use high tensile strength
bolts which must be tightened evenly and torqued suffi
an external means of applying initial load to the seal
ciently to actually deform the ring.
In place of the ?anged type closure assembly, some
ring of the closure assembly.
It is still a further object to provide a closure as
valves use a pressure actuated type closure assembly in 30 sembly having a pressure actuated seal ring with an
independent retaining means and independent loading
‘which a bonnet is inserted in the opening and a metallic
means to apply initial sealing load on the seal ring in
.ring, which is pressure actuated, is interposed between
which the amount of load is limited.
the wall of the opening and the bonnet. This assembly
Other and further objects of the invention will be
has the advantage of being easier to assemble; however,
certain types develop extremely high hoop stresses re 35 obvious upon an understanding of the illustrative em
quiring a large mass surrounding the wall of the opening.
bodiments about to be described, or will be indicated in
Other types required precise measurements with tight
the appended claims, and various advantages not re—
tolerances which are difficult to manufacture on a day
ferred to herein will occur to one skilled in the art upon
to-day basis. Some, particularly when the opening in
volved is large in diameter, are dif?cult to tighten su?i
employment of the invention in practice.
Preferred embodiments of the invention have been
ciently so that an initial seal is obtained. If screw threads
are used to provide the initial loading means for the
chosen for purpose of illustration and description and
are shown in the accompanying drawings, forming a
pressure actuated type seal of large diameters, the ef?
part of the speci?cation, wherein:
7
FIG. 1 is a vertical section of a valve having a closure
ciency of the threads is so low that an excessive amount 45
of torque is required to obtain the necessary load to
effect an initial seal.
Moreover, in most pressure ac
tuated type closure assemblies it is necessary to have pre
cise concentricity of all the parts involved which is ex
assembly of the present invention.
FIG. 2 is an enlarged fragmentaryvportion showing
details of the closure assembly.
FIG. 3 is a view similar to FIG. 2 showing an alternate
tremely di?‘icult to obtain with normal shop practices.
form of closure assembly.
The present invention is directed to a closure assembly
having a pressure actuated seal ring which is economical
Referring now to the drawings, there is illustrated a
valve 10 having incorporated therein the closure as
* to manufacture and easy to assemble and which does
sembly of the present invention. The closure assembly
develop high hoop stresses. The wall of the opening
may be incorporated in any type of pressure vessel hav
ing an opening which is closed by a disengageable closure.
of the pressure vessel or a valve body is machined to
provide a sealing surface. The closure member is pro
vided with a peripheral sealing surface. Between the
The invention does not relate speci?cally to the nature
or purpose of the pressure vessel, but to a means for
sealing surface of the closure member ‘and the seal
effecting the closure of an opening in such a pressure
vessel.
ing surface of the wall of the opening a metallic
:seal ring is interposed. The seal ring has surfaces cor 60
The valve 10 has a body .12 having a ?ow passage
responding to the adjacent walls of the opening and
closure member. The independent retaining means is
detachably secured in the opening axially outward of
14- therethrough which is interrupted by an open-ended
valve chamber 16. A valve seat 18 surrounds the flow
passage 14 at each side of the valve chamber 16. P0
the sealing surface. If the closure assembly is for a
sitioned in the valve chamber 16 is a valve member 20
valve, suitable means are provided to seal around the 65 which cooperates with the valve seats .18 to control the
stem that normally projects through the bonnet. The
?ow of fluid through the flow passage 14.
retaining means acts simply as a holding means for the
The valve chamber 16 has an opening 22 through
closure member and does not apply any load directly
which the valve seats 18 and valve member 20 are in
to the closure member. The retaining means is pro
serted. The opening 22 is closed by a removable bonnet
vided with a ?xture which permits application of plastic
assembly through which a stem 24 attached to the valve
packing from the exterior. This plastic packing acts on
member 20 extends. Rotation of the stem 24 causes the
the closure member and applies a hydraulic load on the
valve member 20 to move to either block flow through
3,091,470
3
4
the ?ow passage 14 or permit ?ow therethrough. The
valve seats 18 and valve member 20‘ are initially inserted
through the opening 22 and it is desirable that entrance
56 of the closure member 30. The end of the retainer
member has a surface 64 which generally opposes the
outer annular surface 58 of the closure member 30.’
can be obtained subsequently to repair or renew the
valve seats #18 and valve member 20; therefore, it is
initial tightening of the retainer member 38, there will
Positioned in the notch 60 is an O-ring seal 66.
necessary that the’ bonnet assembly closing the opening
22 be removable. However, during the operation of
After
be a space between the opposed surfaces 58-64 of the
closure member and retainer member. Since the retainer
means 33 is held stationary in the opening 22 by its
the valve it is essential that the opening 2-2 be tightly
closed so that no ?uid ?owing through the valve can
threaded engagement, the injection of plastic packing 59
escape to the atmosphere. It is the removable bonnet 10 through the ?tting 52 will, after ?lling the stu?ing box
assembly with which the‘ present invention is primarily
46, flow between the surfaces 58 and 64 until it is stopped
concerned.
h
by the O-ring seal 66. Further introduction of plastic
To form the bonnet assembly, theopening is machined
packing 50 will cause a pressure to build up between the
to provide a sealing ‘surface '26 which in the drawing is
surfaces 58 and 64 causing thevclosure member. 30 ‘to
shown as a cylindrical surface.‘ However, if a different 15 move axially inward putting pressure between the seal
type of seal ring is used in place of the ring illustrated,
ing ring 34 and its mating surfaces. Due to ..the fact
the sealing surface will’be correspondingly changed to
adapt for ‘such seal ring. Axially inward of the cylin
that the tapering surface 32 projects through .the sealing
ring 34 and thev taper of the inward. projecting surface.v
32 is'ata relatively small angle to thelongitudinal axis
34_will_
of the opening
be positively
22, it expanded
will be evident
as thethat
closure
the seal
member.
ring
‘*39?is forced axially inward. This will tend ‘to form. a
?uid type seal between the inner face of the .seal ring.
34 ‘and the inwardly tapering surface 32 of the. closure .
drical’surface' 26 the wall of the opening is of a reduced
diameter whereby-a shoulder 28 is formed between the
axial‘i'nner end of the cylindrical surface 26 and the
reduced diameter of the opening.
Positioned in the
opening is a closure member "30 having an inwardly
tapered ‘surface 32 which‘ is opposed to the cylindrical
surface 26. ‘A pressure’ actuatable type seal ring’34 is 25 member 30, and between the outer ‘face, of the seal ring .
positioned between the tapering surface 32 of the closure
34 of the cylindrical surface 26 of the opening. At the,
member 36 and the cylindrical surface 26 of the opening.
same time, it will tend to holdthe seal ring ‘34 downward.-.v
The‘seal ‘ring 34 is 'insertable'through the opening 22 and
1y upon the shoulder 28. This will produce an initial
has surfaces which correspond to the surfaces 32 of the
seal so that further internal pressure from the valve
closure member and cylindrical wall 26 which it opposes. 30 chamber will act upon the bottom face, ‘of theseal ring ..
The closure member 30'is provided with a centrally lo
34 causing it to moverfurther up into the space between
cated passage 36 through“ which the" stem 24 extends.
the inwardly tapering surface and the cylindrical surface
To retain ‘the closure member 30 in position as the
to form even a tighter seal. ,7 In order to prevent. an ex
internal pressure in the valve chamber 16 exerts force
cessive initial load being produced upon the seal ring
on theseal ring 34 tending to force the seal ring 34 beé 35 34, the closure member 38 is provided with an annular .
tween the‘ tapered surface ‘32 and cylindrical surface 26,
shoulder 63 which is of a greater diameter than cylindri
a retainer member 38 is removably secured in the open
cal surface 26 and overlies it. Therefore, after the ,clo
ing 22-axially outward of theclosure member 30.
sure member has moveda sufficient amount inward to
The retainer member 38 also provides means through
form the initial seal, ‘all further inward movement is
whichraxially inward force can‘ be exerted upon the clo 40
sure member to establish‘ an initial seal between the seal
Since'it is not necessary for the retainervmeans 38 to
ring? and-\its' mating surfaces as will be explained subse
put a load on the closure'member 30, it is not necessary, I
queritly.» ‘in order‘ to' removably secure the retainer‘memé
for the threads'40 aIldA-Zt to be of such construction as
ber 38‘ in‘the opening 22,7the wall of the opening axially
to be load vapplying, therefore, they can be rather loose to
outward of the cylindrical surface is provided with female 45 permit easy assembly. If desired, instead of using the
threads 40‘ and'the outer periphery of the retainer mem
threads‘ 40%42, it ‘is possible to utilize other means to
ber is‘ correspondingly provided‘ with male threads 42.
form a connection between the‘ retainer member 38 and
arrested.
’
i
'
The two sets-v of threads are threadedly engaged to attach
opening, such as'a bayonet type holding assembly which
the retainer member 38 in the opening.
is also easy to assemble.
The retainer
member 38 may have a shoulder overlying the top of
the body which will limit the inward movement of the
retainer‘ member 138. The‘ retainer‘ ‘member, like the
Thisfmeans of assembly is
especially important ,on large size valves or pressure ves
sels ‘where the opening may be’ 20"'or more in diameter.
If load applying threads are used,,the amount of torque
closure member, is provided with a passage 44 through
to turn the retainer means ‘38 is'exceedinglyhigh. By
Which'the stem 24 extends. Coaxial with the passages
the use of the present construction, thebonnet ‘assembly, I
through the closure member andretainer member there 55 can be easily assembled and after the‘assembly is com-.
is a recess 46 of slightly greater diameter’than the pas
pleted the load to establish the initial seal‘ of the-seal
sage. A portion of the'recess 46 is in the closure mem
ing ring can be accomplished by the addition of plastic , ,
ber 30 and a'portion ispin the retainer member 38. The
recess 46' forms a stu?ing box to provide means to seal
between- the stem 24 and‘ the passages 36 and 44. To
effect this seal,v a set of'chevron rings 48 is positioned in
each-end of the stu'i?ng box 46. Supplementing the
chevron ring sets 48 is plastic packing 50 which is be
packing 50‘ which will properly load the sealing ring 34 to
establish the initial seal.
60
'
If a leak develops whereby the plasticpacking 50 is
dissipated, the closure assembly will still held since the
seal ring 34 does not depend upon the downward thrust
of the packing for any seal except the initial seal. Once
tween the chevron rings 48—48. To introduce the plas
the initial ‘seal has been established, the internal pressure
tic-packing 50‘into the stu?ing box 46, there is a pas 65 in the valve chamber 16 will maintain ‘the .seal. The
sage 52 extending through the retainer member 38 and
amount of upward movement resulting vfrom loss of
communicating with the stu?ing box 46 and exterior.
plastic packing is not su?icient to permit the extrusion of
Positioned in the passage 52 is a packing ?tting 54
the sealing ring 34, and if the closure member is, permitted
through which the packing 50 can be introduced.
to move axially outward due to the loss of packing the
The ‘outer end of the closure member 30 has a gen
internal pressure on the sealing ring 34 Will cause it to
erally cylindrical portion 56' terminating in an outer 70 follow along.
annular surface 58.~ A notch 60 is formed in the outer
periphery of the‘ annular surface 58. The retainer mem
FIG. 3 shows an alternate form of construction Where
by instead of using the plastic ?tting from the stuffing box
ber 38‘is‘ provided with a cylindrical portion 62 which
to apply the hydraulic pressure‘ on the closure member
is proportioned to telescope over the cylindrical portion 75 ‘ there is an independent packing system for applying pres
3,091,470
5
sure to the closure member.
6
As can be seen, the con
struction of the bonnet assembly, shown in FIG. 3, ex
cept for the above distinction and the necessary altera
tions because of it is quite similar to that shown in FIGS.
-1 and 2. The opening is provided with a cylindrical sur
face 72. A closure member 74 having an inwardly taper
ing surface 76 is opposed to the cylindrical surface 74.
Interposed between the cylindrical surface 72 and the
inwardly tapering surface 76 is a seal ring 78. The
lindrical surface, a pressure actuated metal sealing ring
positioned between the sealing surface of the closure
member and the sealing surface of the opening, retaining
means disengageably secured to the wall of the opening
axially outward of the sealing surface, said closure mem
ber and said retaining means having spaced opposed sur
faces, means forming a seal about the periphery of said
opposed surfaces, a passage in the retaining means com
municating with the space between said opposed sur
closure member 74 has an opening through which a stem 10 faces, means in said passage to permit the injection of a
80 extends. To retain the closure member 74 in operative
pressurizing medium from the exterior to said space to
position, there is a retainer member 82 which is detachably
force the closure member axially inward forming an
secured to the opening axially outward of the cylindrical
initial seal between the sealing ring and the surfaces it
surface '72. The retainer member 82 has a passage 84
contacts, and means attached to said closure member to
for the stem 84} and a stu?ing box 86 to provide a seal be
limit the amount of axial inward movement of said
tween the passage 84 and stem 80.
The axial outer end 83 of the closure member 74 is
generally cylindrical and the retainer member 82 is pro
closure member.
3. A closure assembly for a pressure vessel comprising
a pressure vessel having a circular opening, sealing sur
vided with a recess 90 to receive the cylindrical end por~
faces in the wall of said opening, a closure member posi
tion 88 of the closure member. To facilitate assembly, 20 tioned in said opening having a sealing surface opposing
the edges of the recess 90 of the retainer member 82 may
the sealing surface of the opening, a pressure actuatable
have a slight bevel. When assembled the closure member
metal seal ring interposed between said closure member
74 and retainer member 82 have spaced opposed surfaces
and the sealing surface of said opening, a retainer mem
92—94. The surface of the outer cylindrical end por
ber disengageably secured to the walls of the opening
tion 88 has annular grooves in which are positioned 25 axially outward of the seal ring, said closure member and
O-rings 96. This construction in effect produces a piston
said retainer member having spaced opposed surfaces,
assembly. Communicating with the space between the
means forming a seal about the periphery of said opposed
opposed surfaces 92-94 there is a passage 98 in the
surfaces, a passage in the retainer member communicating
retainer member 82 which extends to the exterior. Posi
with the space between said opposed surfaces, means in
tioned in the passage 98 is a ?tting 100 which permits the 30 said passage to permit the injection of a pressurizing
introduction of pressurizing medium 102, such as plastic
medium from the exterior to said space to force the
packing, grease, or any hydraulic or pneumatic medium.
closure member axially inward to form an initial seal
The pressurizing medium 102 causes the closure member
between the seal ring and the surfaces it contacts.
74 to move axially inward establishing an initial seal be
4. A closure assembly for a pressure vessel comprising
tween the sealing ring '78 and its mating surfaces as pre 35 a pressure vessel having a circular opening, a portion of
viously described. To limit the amount of axial inward
the wall of the opening providing a cylindrical surface,
movement of the closure member 74, there is a shoulder
a portion of the wall axially inward of the cylindrical sur
Hi4 which overlies the cylindrical surface 72.
face being of a reduced diameter thereby forming a
As can be seen from the above, the invention provides
shoulder at the axial inward end of the cylindrical sur
a closure assembly having a pressure actuated seal ring
face, a closure member having an inwardly tapering sur
which is easy to manufacture and assemble since the
face positioned in the opening with the inwardly tapering
initial loading of the seal ring does not depend upon
surface opposed to the cylindrical surface, a pressure ac
generating mechanical force with the retainer means, but
tuated metal seal ring positioned between the tapering
is independently provided by the hydraulic action of
surface of the closure member and the cylindrical sur
pressurizing medium.
face of the opening, retaining means disengageably se
45
As various changes may be made in the form, construc
cured to the wall of the opening axially outward of the
tion and arrangements of the parts herein without depart
cylindrical surface, a passage in the retaining means
ing from the spirit and scope of the invention and without
communicating with an axial outer surface of the closure
sacri?cing any of its advantages, it is to be understood
member, means in said passage to permit the injection
that all matter herein is to ‘be interpreted as illustrative
50 of a pressurized medium from the exterior to the axial
and not in a limiting sense.
outer surface of the closure member to force the closure
What is claimed is:
member axially inward forming an initial seal between
1. A closure assembly for a pressure vessel comprising
the sealing ring and the surfaces it contacts.
a pressure vessel having a circular opening, a portion of
5. A closure assembly for a pressure vessel comprising
the wall of the opening forming a sealing surface, a
a pressure vessel having a circular opening, a portion of
55
{closure member having a sealing surface positioned in
the wall of the opening providing a cylindrical surface, a
the opening with the sealing surface opposed to the cy
portion of the wall axially inward of the cylindrical sur
lindrical surface, a pressure actuated metal sealing ring
face being of a reduced diameter thereby forming a shoul
positioned between the sealing surface of the closure
der at the axial inward end of the cylindrical surface, a
member and the sealing surface of the opening, retaining
closure member having an inwardly tapering surface posi
means disengageably secured to the wall of the opening 60 tioned in the opening with the inwardly tapering surface
axially ‘outward of the sealing surface, said closure mem
opposed to the cylindrical surface, a pressure actuated;
ber and said retaining means having spaced opposed sur
metal sealing ring positioned between the tapering sur-.
faces, means forming a seal about the periphery of said
face of the closure member and the cylindrical surface of
opposed surfaces, a passage in the retaining means com
65 the opening, retaining means disengageably secured to
municating with the space between said opposed surfaces,
means in said passage to permit the injection of a pres
surizing medium from the exterior to said space to force
the closure member axially inward forming an initial
the wall of the opening axially outward of the cylindrical
surface, said closure member and said retaining means
having spaced opposed surfaces, means forming a seal
about the periphery of said opposed surfaces, a passage
seal between the sealing ring and the surf-aces it contacts. 70 in the retaining means communicating with the space be
2. A closure assembly for a pressure vessel comprising
tween said surfaces, means in said passage to permit the
a pressure vessel having a circular opening, a portion of
injection of a plastic packing from the exterior to said
the wall of the opening forming a sealing surface, a
space to force the closure member axially inward form
closure member having a sealing surface positioned in
ing an initial seal between the sealing ring and the sur\
the opening with the sealing surface opposed to the cy 75 faces it contacts.
3,091,470
r
8
7
6. A closure assembly vfor a pressure vessel comprising
a pressure vessel-having a- circular opening, a portion of
mitting the injection of plastic packing from the exterior .
to'said stuf?ng box, said closure member and said re
the wallof the opening providing a cylindrical surface, a
portion of the wall. axially inward‘of the cylindrical sur
tainer vmember having spaced opposed surfaces, means
face‘being of a reduced diameter thereby forming a shoul
sage from said stu?ing box to the space between said op
posed surfaces permitting said packing to enter said space
der-sat the axial inward end‘of the cylindrical surface, a
closure member having an inwardly tapering surface po
sitioned. in the opening with the inwardly tapering sur
face-opposed ‘to the cylindrical surface, ‘a pressure actu~
ated' metal sealingring positioned between the tapering 10
forming a seal about the periphery of said surfaces, a pas
to force the closure member axially inward forming an
initial seal between the'sealing' ring and the surfaces it
contacts.
7
I
9. A bonnet assembly fora valve comprising a valve
body having an open ended valve chamber, a portion of
the wall of the open end of the valve chamber‘being pro
vided with a cylindrical surface, ‘a portion of the wall
surface ‘of the closure member and the cylindrical surface
of the opening, retaining means disengageably secured to
the wall of the opening axially outward of the cylindrical
axially inward of the cylindrical surface being of reduced
surface, said- closure ‘member and said retaining means
havingspaced opposed surfaces, means forming a seal 15 diameter, therebyforming a shoulder with the axial inner
end of the cylindrical surface, a closure member having
about-the periphery of said opposed surfaces, a passage
an inwardly tapering surface positioned .in the opening
in the retaining means communicating with the space be
with the inwardly tapering surface opposed to the cylin
tween said surfaces,‘ means in said passage to permit the
drical surface, a pressure actuated metal sealing ring posi
injection of a plastic packing from the exterior to said
spacetto force the closure'member axially inward forming 20 tioned between the tapering surface of the closure mem
ber and the cylindrical surface of the opening, a central
an initial seal between the sealing ring and the surfaces it
passage ‘extending through the closure member, a valve
contacts, and means attached to said closure member to
operating stem passing through said passage, a retainer
limit the amount of axial inward movement of said clo—
member for said closure member vdisengage-ably secured
sure member.
7. A bonnet assembly for a ‘valve comprising a valve 25 to the'wall of the opening axially outward of the cylindri
cal surface, a stuffing box in the closure member about
body having an open ended valve chamber, a portion of
said ‘stem, a passage in said retainer member communi
the wall of the open-end ‘of the valve chamber being pro
cating with said stuf?ng box, means in said passage per
vided with‘ -a cylindrical surface, a portion of the wall
mitting the injection of plastic packing from the exterior
axially inward of the cylindrical surface being of reduced
diameter thereby forming a shoulder with the axial inner 30 to said stuffing box, said closure member and said retainer
member having spaced opposed surfaces, means forming
end of the cylindrical surface, a closure member having
a seal about the periphery of said surfaces, a passage from
an inwardly tapering surface positioned in the opening
said stu?ing box to the space between said opposed sur
with the inwardly tapering surface opposed to the cylindri
faces permitting said packing to enter said space to force
cal surface, a pressure actuated metal sealing ring posi
tioned ‘between the tapering surface of the closure mem 35 the’closu-re member'axially inward forming an initial seal
between the sealing ring and the surfaces it contacts, and
ber and the cylindrical surface of the opening, a central
means attached to» said closure member to limit the
passage. extending through the closure member, a valve
amount of axial inward movement of said closure mem
operatingstem passing through said passage, a retainer
member for said closure member disengageably secured
10. A bonnet assembly for a valve' comprising a valve
to the wall .of the opening axially outward of the cylindri
body having an open ended valve chamber, a portion of
cal surface, a stu?ing box in the closure member about
the wall of the open end of the valve, chamber being pro
said' stem','a'passage in said retainer member communi
vided with a cylindrical surface, a portion of the wall
cating with said stu?ing'box, means in said passage per
ber.
,
v
mitting the injection of plastic packing from the exterior 45 axially inward of the cylindrical surface being of reduced
diameter thereby forming a shoulder with the axial inner
to said stuffing box, a passage from said stu?ing box to
an axially outer surface of the closure member permitting
said‘ packingto. contact said vaxial outer surface of said
end of the cylindrical surface, a closure member having
an inwardly tapering surface positioned in the opening
with the inwardly tapering surface opposed to the cylin
closure member to'force the closure ‘member axially in
ward forming lan‘initial' seal between the sealing ring and 50 drical surface, a pressure actuated metal sealing ring po
sitioned between the tapering surface of the closure mem
the surfaces it contacts.
ber and the cylindrical surface of the opening, a central
8. A bonnet'assembly for a valve comprising a valve
pass-age extending through the closure, member, a valve
body'having an» open ended valve chamber, ‘a portion of
operating stem passing through ,said passage, a retainer
the wall of vthe open end of the valve chamber being pro
member for said closure member disengageably secured
vided with a cylindrical surface, a'porticn of the wall
to the wall of the opening axially outward of the cylindri
axially inward of the cylindrical surface being of reduced
diameter thereby forming a shoulder with the axial inner
cal surface, a stu?ing box in the closure member about
end of the cylindrical surface, a closure member having
saidlgstem, said closure member and retainer member hav
an inwardly tapering surface positioned in the opening
ing spaced opposed surfaces, means forming a seal about
with the inwardly tapering surface opposed to the cylindri-'
the periphery of said surfaces, a passage in said retainer
cal surface, a pressure actuated metal sealing ring posi
member having means permitting the injection of plastic
tioned between the tapering surface of the closure mem
packing from the exterior to space‘ permitting said pack
ber and the cylindrical surface of the opening, a central
ing to enter said axial space to force the closure member
passage extending through the closure member, a valve
axially inward forming an initial seal between the sealing
operating stem passing through said passage, a retainer 65 ring‘and the surfaces it contacts. ’
member for said closure member‘ disengageably secured
to the wall of the opening axially outward of the cylindri- '
cal surface, a stu?ing box in the closure member about
saidstem, a passage in said retainer member communi
catingwith said stu?’ing'box, means in said passage per 70
References Cited in the are of this patent
UNITEDVSTATES PATENTS
2,810,592
Williams _______ __..______ Oct. 22, 1957
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