CA1129390A - High performance butterfly valve seal closure - Google Patents
High performance butterfly valve seal closureInfo
- Publication number
- CA1129390A CA1129390A CA353,656A CA353656A CA1129390A CA 1129390 A CA1129390 A CA 1129390A CA 353656 A CA353656 A CA 353656A CA 1129390 A CA1129390 A CA 1129390A
- Authority
- CA
- Canada
- Prior art keywords
- seal
- valve
- ring
- disc
- closure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2263—Shaping or arrangements of the sealing the sealing being arranged on the valve seat
- F16K1/2266—Shaping or arrangements of the sealing the sealing being arranged on the valve seat and being forced into sealing contact with the valve member by a spring or a spring-like member
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Sealing Devices (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A high performance butterfly valve seal structure in-tended for operation in high pressure and high temperature applications wherein a metallic seal is provided between a disc and a body of the valve including a thin metal, shaped seal ring, continuous throughout 360 degrees, is provided to have line contact in assembled position with both the body of the valve and the closure disc of the valve and being slightly compressed upon closure without pressure in the line so as to be effective under low differential pressure conditions. The seal ring is formed so as to be uneffected by flow through the valve or by corrosive liquids carried in a fluid line in which the valve may be utilized. The valve is intended to be operable against high temperature condi-tions.
A high performance butterfly valve seal structure in-tended for operation in high pressure and high temperature applications wherein a metallic seal is provided between a disc and a body of the valve including a thin metal, shaped seal ring, continuous throughout 360 degrees, is provided to have line contact in assembled position with both the body of the valve and the closure disc of the valve and being slightly compressed upon closure without pressure in the line so as to be effective under low differential pressure conditions. The seal ring is formed so as to be uneffected by flow through the valve or by corrosive liquids carried in a fluid line in which the valve may be utilized. The valve is intended to be operable against high temperature condi-tions.
Description
~29390 HIGH PERFoRMANcE BUTTER~LY VALVE SEAL_CLOSURE
BACKGROUND OF T~E INVENTION
Butterfly valves are ~rally of the type which have a body in which is mounted a shaft carry;ng a closure disc rotatable with the shaft between two positions approximately 90 degrees apart, one in which the disc is across the flow passage and has a sealing structure at its edge cooperating with the valve body to close the passage against fluid flow and a second position in which the disc is moved into align-ment with the flow so that the liquid, gas or other fluidmay pass the disc on either side thereof, the disc remaining in the flow passage in its open position. Many waterworks valves of the butterfly type utilize rubber or rubber-like elastomeric compounds as the sealing element between the edge of a metallic disc and a metallic body. Such sealing elements may be placed in the body and cooperate with the metallic disc edge or in the alternative, the sealing struc- i ture may be carried upon the edge of the disc and engage against an appropriately shaped surface in the body of the valve. Various configurations and arrangements of discs, shafts carrying the discs and the valve bodies have been made whereby the disc may have a continuous 360 degree circular edge portion to cooperate with the sealing element~
In some uses a valve referred to generally as high performance valves, are required wherein either high tem-peratures and/or high pressures are encountered and require a valve to operate under such conditions. Attempts have been . C
.
~lZ9390 made to make high performance val~es wi~th various resilient, plastic compounds as the seating el`ement to cooperate with the metallic parts of the valve. High strength resilient plas-tic compound such as TEFLO ~, reinforced metals, have been proposed. Some other proposals have utilized certain metal seats and seals and generally most such constructions suffer from an inability to make tight closure of the valve under higher temperatures.
SUMMARY OF THE INVENTION
This invention seeks to provide a new and improved high performance valve utilizing metal components in valve body, valve discs and seals between the disc and valve body.
The invention also seeks to provide an improved seal structure which will be operable through all conditions of negative pressures, elevated pressures and high temperatures.
In one broad aspect, the invention pertains to a high temperature, high pressure butterfly valve having a body with a flow passage and carrying a rotatable shaft mounting a disc ;
closure in the passage and in particular to a closure seal operable between the body and disc edge in valve closed posi-tion and sealing against fluid flow. The closure seal com-presses a relatively thin overall circular metal seal member having an operable configuration portion with a shape providing a rounded inner and outer surface respectively at an inner diameter and at an outer diameter for substantially circular line contact with the body and disc edge. The seal is resiliently flexible between the line contacts and is slightly compressed by closure of the disc across the flow passage.
. ..
Mean~ ret~in the seal in the ~alve, and means expose the seal portions internally of the line contacts to upstream fluid pressure aiding seal resiliency to pressure the seal to disc edge and to valve body line contact areas.
Another aspect of the invention as claimed pertains to a high performance closure seal for a butterfly valve having a body and disc offset upon a shaft so as to present a con-tinuous disc edge adjacent the body for closure of a fluid passage through the valve. The closure seal comprises a metallic annular seal ring of relatively thin material shaped to present a hollow interior with fluid openings upstream into such interior. A mounting on the body for the seal ring includes one surface engaging the seal ring radially outwardly of the fluid passage along a circular, line contact on the exterior of the seal ring and another surface engaging the down-stream exterior of the seal ring along a circular line contact opposite the upstream fluid openings to the interior of the seal ring. The seal ring is substantially free of other body contact and the body mounting exposes a circular inner seal ring surface for engaging a co-operating surface on the disc, the inner seal ring surface having a circumference slightly smaller than the circumference of the disc surface so that the seal ring is compressed upon closing the valve with no fluid pressure therein.
More particularly, the invention provides a type of high performance butterfly valve in which a metallic body is provided with a shaft upon which a closure disc is mounted to one side of the shaft and cooperates with seal structures carried in the body of the valve including annular 360 degree, metallic, shaped, rings with cross C
, 1129390 `
sections substantially in the shape of a letter "C", which ape provides for line contact against the body and the disc at spaced inner and outer aiameters and but one other line contact with the body intermediate the aforesaid lines in order to retain the seal in position, such seal being sized to provide a slight compression of the seal upon closure of the disc without pressure within the valve in order to aid in sealing against low differential pressures across the closed disc and in which a retainer in the valve body for the sealing ring is removable for seal replacement as well as being mountable in either one of two positions to accommodate, alternatively, a single sealing ring or a double sealing ring.
DESCRIPTION OF THE DR~WINGS
Figure 1 is a broken diametrical section view through the center of a typical butterfly valve (in closed position) ~;
employing the invention of the present invention.
Figure 2 is a broken plan view looking toward the righthand side of Figure 1.
Figure 3 is a broken sectional view of enlarged scale of the sealing xing portion at the edge of a disc and the adjoining body section such as would appear at the lower end of the disc in Figure 1.
Figure 4 is an alternate construction of the same portion of the valve as shown in Figure 3 with the retaining ring reversed and assembled with a single seal ring in operable position.
` DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Figures 1 and 2, a typical valve con-struction of a butterfly valve is illustrated in which the present invention may be utilized. T~e body 10 of cast or 4, ~abricated metal is provide~ wlth a flow passage opening 11 therethrough. The valve body is shown as of a wafer-type intended to be sandwiched between the adjoining flanges of mating pipe. It should be understood that the valve body may be equipped with flanges, weld necks or other usual structure chosen by virtue of the type of line in which the valve is to be installed. The valve mounts at its upper end a shaft 12, extending centrally or slightly off center through the valve body for the purpose of securing a closure disc thereto. A stub shaft 13, at the bottom is likewise provided for the same purpose. The shaft has an upper end exposed exteriorly of the valve for the attachment of an operating handle or a motorized valve operator intended to turn the shaft through 90 degrees to effect opening and closing of the valve. The shaft is provided with bearinys 14 and with an "O" ring seal 15 (or other type of seal) there-~etween and a packing member 16 thereabove to insure against leakage outwardly of the valve body along the shaft 12. The lower shaft is similarly provided with bearings 16 and a thrust washer structure generally indicated at the bottom erd of the stub shaft 13 by the reference 17, having a cap 18 bolted to the end of the valve body and a seal 19 against leakage outwardly of the valve body along the stub shaft 13.
The closure disc 20 is of metallic construction, into which the shaft 12 and stub shaft 13 extend with pins 22 and 23, securing respectively the two shafts to tl-e valve disc.
T~,e disc is offset to one side of the centerline of the shaf~s 12 and 13 and is carried with the turning of the shaft between a position extending across the flow passage 11 and to a position generally aligned with the flow path and within the flow path so that fluid may flow about the disc s~hen the valve is open.
5.
liZ9390 In the particular embodiment illustrated in the draw-ings, the edge o~ the disc adjacent a seal structure, gen-erally indicated 25, is spherical in shape. The disc cdge 27 (Fig. 3) is intended to cooperate with the seal members carried in position in the valve body opposite the edge of the disc when the disc is in closed position. It should be understood that the closure seals 25 may equally be mounted upon the edge of the disc, whereupon, the edge spherical surface with which the seals cooperate would be mounted in or be part of the body defining a portion of the flow pass-age through the body. In the present structure, the seal mechanism 25 is retained in position by a rigid ring of metal 26 which is secured to the valve ~ody lO. In in-stances of the carrying of the seal structure 25 on the edge of the disc, a similar but smaller rigid ring of metal will be bolted or otherwise secured to the disc for the purpose of retaining the seal rings in operable position.
Referring to Figure 3, there is an enlarged view of the seal str~lcture showing a portion of the disc 20 and bod~
of the valve and with the seal portions. Theled~e 27 of the disc forms a portion of a spherical surface centered upon the center of the flow passage and the center of shafts 12 and 13, such center being marked "C" in Figure 1~ In some butterfly valve structures, the shaft centerline may ~e placed to one side of the flow passage centerline, in which structure the shaft centerline would not cross the flow passage centerline at point "C" but be closely spaced to one side of the flow passage centerline.
The seal structure itself comprises a pair of metallic, "C" shaped in section, 360 degrees continuous annular rings.
~he left hand ring in Figure 3, has an opening ~etween the ends ~8 and 29 of the "C" shape of approximately 90 degrees.
7i~'` ' , ~ . . .
--~he second ring is also "C" shaped, having a center at "E"
dnd an opening of 90 degrees, approximately between the ends 30 and 31.
Each seal ring may be made of a number of different alternative metals, such as INCONEL(~ stainless stee], aluminum or copper. The rings are shaped to be self-sus-taining in shape, with the opening between the faces such as 28 and 29 extending throughout 360 degrees. The rings may be coated with a thin coating of material which will be l softer or harder than either the surfaces of the disc or the body a~ainst which they rest. Silver, copper, lead, indium, nickel and gold are suitable metallic coat;ngs. It is pre-ferred that the sealing rings surface finish and the mating sealing surfaces be about 16 rms or better. Typical valve sizes, expressed in nominal pipe diameters, may be from four inches through the extensively used six, eight, ten and twelve inch sizes on up to guite large diameters such as 144 inches.
Referring again to Figure 3, the left hand "C" ring '0 designated 31, has a line contact at 32 which is continuous throughout 360 degrees with the edge surface 27 of the disc An opposite line contact 33 exists with a surface 34 in the valve body which is circular cylindrical about the center-line of the flow path passing through cent~r "C" (Fig. l).
The surface 35 of the valve body, termirlating at the radi-ally directed surface 36 is merely for purposes of diminishirlg the fluid flow exposure of the "C" ring, although it is apparent that the fluid flow;ng from left of the valve may enter into the interior of the ring without diff;cul~y. The only other contact, of the metallic seal ring is with the companion ring 37 at a circular line of contact 38. The 7~
ght hand ring 37 has line contact at 39 with the edge surface of the disc and line contact 40 with a surface 41 on the ring 26, situated for the purpose of such contact. The "C" rings may have a cross-sectional shape such that upon closure of the aisc, there is a radial compression between the line contacts to disc and body.
The sealing rings being self-sustaining in shape, may be inserted into their positions in the valve upon the removal of the rigid, metallic retaining ring 26. This ring 10 has a surface 42 generally parallel to the flow passage centerline, and two radial parallel surfaces 43 and 44, extenaing radially therefrom, so that either surface may be placed against the valve body 10 and retained by the retain-ing bolt 45. The groove illustrated in Figure 3, provides the surface 41 for the sealing ring 37. The opposite corner of the retaining ring may be utilized to retain a single seal ring as shown in Figure 4.
In the valve in Figure 3, pressure and flow from either direction approaching the valve may be sealed against leak- I
20 age. Any leakage out of the valve when the disc is in open position is prevented from escape out of the valve body by a static seal ring 47 placed in an appropriate groove 48 in the valve boay for the purpose of receivinq the seal ring.
This ring is illustrated as a metallic ring which would be utili~ed in a valve which might become exposed to extremely high temperatures.
Referring to Figure 4, the parts of the valve are similar, showing the use of a single seal ring 31, the difference being that the retaining metallic rigid ring 26 30 has been inverted or reversed in its attachment to the valve body by the bolts 45. The chamfered area 49, which pre-viGusly received the head 50 of the bolt 45 is now adjacent , ... ... . . .. .. . .... .... _.. . .... . _ ., . .. . _ .. _ .. ~ _ . .. , . _. ~ .. ,. _ .. _ _ . _, . __ .,. _ ,, _, __ ~lZ9390 ~~ the valve body as illustrated, the head of the bolt in Figure 4 residing in a chamfered receptacle 51, illustrated adjacent to valve body in Figure 3. In the construction of - Figure 4, a line ~ontact exists at 52 between the retaining ring 26 and-the backside or downstream side of the "C"
shaped seal ring 31. The line contact 52 on the ring serves only to retain the ring 31 in place while the valve is open~
Fluid flow will not disturb the proper functional location of the seal ring. When utilized in the fashion illustrated in Figure 4, only pressure and flow occurring from the left hand side of Figure 4 may be sealed against leakage. Thus in this form it is a one-way valve which must be installed properly in the line to seal flow in a single ~irection upon valve closure. The sealing ring 31 in Figure 4 is oriented ~ ;
in the valve precisely in the same manner as`described for the seal 31 in Figure 3. Also, the sealing ring 31 has the same line contacts with the body and disc in closed posi-tion, each line contact being continuous throughout 360 degrees.
Valves made in accordance with the principles of the present invention may have one seal for one-direction flow closure and may have two back-to-back seals for closure against flow in either direction. Valves in which`two C-shaped sections have been successfully tested are substan-tially as illustrated in Figure 3 of the drawing. The orientation of the left hand ring was such that the line past the end 28 of the ring to the center marked "D" of the ring resulted in a line outwaraly such that the angle between that line and a plane perpendicular to the center-line of flow was approximately 70 (arrows "AA"). The second or right hand ring was also C-shaped and oriented such that a line from the center "E" past the end 30 of the llZ9390 ~ g resulted in a line at the arrow "B" such that the angle between the lines "BB" and a plane perpendicular to the flow axis was approximately 56. Various wall thicknesses of rings may be utilized, for example, in or about 6 and 50 thousandths inch thickness has been found satisfactory. In one such structure the rings were coated with a dead-soft silver coating capable of slight flowing to fill in any machine marks or small pores in the metal. The size of the "C" rings found satisfactory may vary such that the cross-sectional shape may be in the range of .063" to .500". Thediametrical compression of from .020 to .040" by bending of the ring part has ~een found satisfactory.
10.
BACKGROUND OF T~E INVENTION
Butterfly valves are ~rally of the type which have a body in which is mounted a shaft carry;ng a closure disc rotatable with the shaft between two positions approximately 90 degrees apart, one in which the disc is across the flow passage and has a sealing structure at its edge cooperating with the valve body to close the passage against fluid flow and a second position in which the disc is moved into align-ment with the flow so that the liquid, gas or other fluidmay pass the disc on either side thereof, the disc remaining in the flow passage in its open position. Many waterworks valves of the butterfly type utilize rubber or rubber-like elastomeric compounds as the sealing element between the edge of a metallic disc and a metallic body. Such sealing elements may be placed in the body and cooperate with the metallic disc edge or in the alternative, the sealing struc- i ture may be carried upon the edge of the disc and engage against an appropriately shaped surface in the body of the valve. Various configurations and arrangements of discs, shafts carrying the discs and the valve bodies have been made whereby the disc may have a continuous 360 degree circular edge portion to cooperate with the sealing element~
In some uses a valve referred to generally as high performance valves, are required wherein either high tem-peratures and/or high pressures are encountered and require a valve to operate under such conditions. Attempts have been . C
.
~lZ9390 made to make high performance val~es wi~th various resilient, plastic compounds as the seating el`ement to cooperate with the metallic parts of the valve. High strength resilient plas-tic compound such as TEFLO ~, reinforced metals, have been proposed. Some other proposals have utilized certain metal seats and seals and generally most such constructions suffer from an inability to make tight closure of the valve under higher temperatures.
SUMMARY OF THE INVENTION
This invention seeks to provide a new and improved high performance valve utilizing metal components in valve body, valve discs and seals between the disc and valve body.
The invention also seeks to provide an improved seal structure which will be operable through all conditions of negative pressures, elevated pressures and high temperatures.
In one broad aspect, the invention pertains to a high temperature, high pressure butterfly valve having a body with a flow passage and carrying a rotatable shaft mounting a disc ;
closure in the passage and in particular to a closure seal operable between the body and disc edge in valve closed posi-tion and sealing against fluid flow. The closure seal com-presses a relatively thin overall circular metal seal member having an operable configuration portion with a shape providing a rounded inner and outer surface respectively at an inner diameter and at an outer diameter for substantially circular line contact with the body and disc edge. The seal is resiliently flexible between the line contacts and is slightly compressed by closure of the disc across the flow passage.
. ..
Mean~ ret~in the seal in the ~alve, and means expose the seal portions internally of the line contacts to upstream fluid pressure aiding seal resiliency to pressure the seal to disc edge and to valve body line contact areas.
Another aspect of the invention as claimed pertains to a high performance closure seal for a butterfly valve having a body and disc offset upon a shaft so as to present a con-tinuous disc edge adjacent the body for closure of a fluid passage through the valve. The closure seal comprises a metallic annular seal ring of relatively thin material shaped to present a hollow interior with fluid openings upstream into such interior. A mounting on the body for the seal ring includes one surface engaging the seal ring radially outwardly of the fluid passage along a circular, line contact on the exterior of the seal ring and another surface engaging the down-stream exterior of the seal ring along a circular line contact opposite the upstream fluid openings to the interior of the seal ring. The seal ring is substantially free of other body contact and the body mounting exposes a circular inner seal ring surface for engaging a co-operating surface on the disc, the inner seal ring surface having a circumference slightly smaller than the circumference of the disc surface so that the seal ring is compressed upon closing the valve with no fluid pressure therein.
More particularly, the invention provides a type of high performance butterfly valve in which a metallic body is provided with a shaft upon which a closure disc is mounted to one side of the shaft and cooperates with seal structures carried in the body of the valve including annular 360 degree, metallic, shaped, rings with cross C
, 1129390 `
sections substantially in the shape of a letter "C", which ape provides for line contact against the body and the disc at spaced inner and outer aiameters and but one other line contact with the body intermediate the aforesaid lines in order to retain the seal in position, such seal being sized to provide a slight compression of the seal upon closure of the disc without pressure within the valve in order to aid in sealing against low differential pressures across the closed disc and in which a retainer in the valve body for the sealing ring is removable for seal replacement as well as being mountable in either one of two positions to accommodate, alternatively, a single sealing ring or a double sealing ring.
DESCRIPTION OF THE DR~WINGS
Figure 1 is a broken diametrical section view through the center of a typical butterfly valve (in closed position) ~;
employing the invention of the present invention.
Figure 2 is a broken plan view looking toward the righthand side of Figure 1.
Figure 3 is a broken sectional view of enlarged scale of the sealing xing portion at the edge of a disc and the adjoining body section such as would appear at the lower end of the disc in Figure 1.
Figure 4 is an alternate construction of the same portion of the valve as shown in Figure 3 with the retaining ring reversed and assembled with a single seal ring in operable position.
` DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to Figures 1 and 2, a typical valve con-struction of a butterfly valve is illustrated in which the present invention may be utilized. T~e body 10 of cast or 4, ~abricated metal is provide~ wlth a flow passage opening 11 therethrough. The valve body is shown as of a wafer-type intended to be sandwiched between the adjoining flanges of mating pipe. It should be understood that the valve body may be equipped with flanges, weld necks or other usual structure chosen by virtue of the type of line in which the valve is to be installed. The valve mounts at its upper end a shaft 12, extending centrally or slightly off center through the valve body for the purpose of securing a closure disc thereto. A stub shaft 13, at the bottom is likewise provided for the same purpose. The shaft has an upper end exposed exteriorly of the valve for the attachment of an operating handle or a motorized valve operator intended to turn the shaft through 90 degrees to effect opening and closing of the valve. The shaft is provided with bearinys 14 and with an "O" ring seal 15 (or other type of seal) there-~etween and a packing member 16 thereabove to insure against leakage outwardly of the valve body along the shaft 12. The lower shaft is similarly provided with bearings 16 and a thrust washer structure generally indicated at the bottom erd of the stub shaft 13 by the reference 17, having a cap 18 bolted to the end of the valve body and a seal 19 against leakage outwardly of the valve body along the stub shaft 13.
The closure disc 20 is of metallic construction, into which the shaft 12 and stub shaft 13 extend with pins 22 and 23, securing respectively the two shafts to tl-e valve disc.
T~,e disc is offset to one side of the centerline of the shaf~s 12 and 13 and is carried with the turning of the shaft between a position extending across the flow passage 11 and to a position generally aligned with the flow path and within the flow path so that fluid may flow about the disc s~hen the valve is open.
5.
liZ9390 In the particular embodiment illustrated in the draw-ings, the edge o~ the disc adjacent a seal structure, gen-erally indicated 25, is spherical in shape. The disc cdge 27 (Fig. 3) is intended to cooperate with the seal members carried in position in the valve body opposite the edge of the disc when the disc is in closed position. It should be understood that the closure seals 25 may equally be mounted upon the edge of the disc, whereupon, the edge spherical surface with which the seals cooperate would be mounted in or be part of the body defining a portion of the flow pass-age through the body. In the present structure, the seal mechanism 25 is retained in position by a rigid ring of metal 26 which is secured to the valve ~ody lO. In in-stances of the carrying of the seal structure 25 on the edge of the disc, a similar but smaller rigid ring of metal will be bolted or otherwise secured to the disc for the purpose of retaining the seal rings in operable position.
Referring to Figure 3, there is an enlarged view of the seal str~lcture showing a portion of the disc 20 and bod~
of the valve and with the seal portions. Theled~e 27 of the disc forms a portion of a spherical surface centered upon the center of the flow passage and the center of shafts 12 and 13, such center being marked "C" in Figure 1~ In some butterfly valve structures, the shaft centerline may ~e placed to one side of the flow passage centerline, in which structure the shaft centerline would not cross the flow passage centerline at point "C" but be closely spaced to one side of the flow passage centerline.
The seal structure itself comprises a pair of metallic, "C" shaped in section, 360 degrees continuous annular rings.
~he left hand ring in Figure 3, has an opening ~etween the ends ~8 and 29 of the "C" shape of approximately 90 degrees.
7i~'` ' , ~ . . .
--~he second ring is also "C" shaped, having a center at "E"
dnd an opening of 90 degrees, approximately between the ends 30 and 31.
Each seal ring may be made of a number of different alternative metals, such as INCONEL(~ stainless stee], aluminum or copper. The rings are shaped to be self-sus-taining in shape, with the opening between the faces such as 28 and 29 extending throughout 360 degrees. The rings may be coated with a thin coating of material which will be l softer or harder than either the surfaces of the disc or the body a~ainst which they rest. Silver, copper, lead, indium, nickel and gold are suitable metallic coat;ngs. It is pre-ferred that the sealing rings surface finish and the mating sealing surfaces be about 16 rms or better. Typical valve sizes, expressed in nominal pipe diameters, may be from four inches through the extensively used six, eight, ten and twelve inch sizes on up to guite large diameters such as 144 inches.
Referring again to Figure 3, the left hand "C" ring '0 designated 31, has a line contact at 32 which is continuous throughout 360 degrees with the edge surface 27 of the disc An opposite line contact 33 exists with a surface 34 in the valve body which is circular cylindrical about the center-line of the flow path passing through cent~r "C" (Fig. l).
The surface 35 of the valve body, termirlating at the radi-ally directed surface 36 is merely for purposes of diminishirlg the fluid flow exposure of the "C" ring, although it is apparent that the fluid flow;ng from left of the valve may enter into the interior of the ring without diff;cul~y. The only other contact, of the metallic seal ring is with the companion ring 37 at a circular line of contact 38. The 7~
ght hand ring 37 has line contact at 39 with the edge surface of the disc and line contact 40 with a surface 41 on the ring 26, situated for the purpose of such contact. The "C" rings may have a cross-sectional shape such that upon closure of the aisc, there is a radial compression between the line contacts to disc and body.
The sealing rings being self-sustaining in shape, may be inserted into their positions in the valve upon the removal of the rigid, metallic retaining ring 26. This ring 10 has a surface 42 generally parallel to the flow passage centerline, and two radial parallel surfaces 43 and 44, extenaing radially therefrom, so that either surface may be placed against the valve body 10 and retained by the retain-ing bolt 45. The groove illustrated in Figure 3, provides the surface 41 for the sealing ring 37. The opposite corner of the retaining ring may be utilized to retain a single seal ring as shown in Figure 4.
In the valve in Figure 3, pressure and flow from either direction approaching the valve may be sealed against leak- I
20 age. Any leakage out of the valve when the disc is in open position is prevented from escape out of the valve body by a static seal ring 47 placed in an appropriate groove 48 in the valve boay for the purpose of receivinq the seal ring.
This ring is illustrated as a metallic ring which would be utili~ed in a valve which might become exposed to extremely high temperatures.
Referring to Figure 4, the parts of the valve are similar, showing the use of a single seal ring 31, the difference being that the retaining metallic rigid ring 26 30 has been inverted or reversed in its attachment to the valve body by the bolts 45. The chamfered area 49, which pre-viGusly received the head 50 of the bolt 45 is now adjacent , ... ... . . .. .. . .... .... _.. . .... . _ ., . .. . _ .. _ .. ~ _ . .. , . _. ~ .. ,. _ .. _ _ . _, . __ .,. _ ,, _, __ ~lZ9390 ~~ the valve body as illustrated, the head of the bolt in Figure 4 residing in a chamfered receptacle 51, illustrated adjacent to valve body in Figure 3. In the construction of - Figure 4, a line ~ontact exists at 52 between the retaining ring 26 and-the backside or downstream side of the "C"
shaped seal ring 31. The line contact 52 on the ring serves only to retain the ring 31 in place while the valve is open~
Fluid flow will not disturb the proper functional location of the seal ring. When utilized in the fashion illustrated in Figure 4, only pressure and flow occurring from the left hand side of Figure 4 may be sealed against leakage. Thus in this form it is a one-way valve which must be installed properly in the line to seal flow in a single ~irection upon valve closure. The sealing ring 31 in Figure 4 is oriented ~ ;
in the valve precisely in the same manner as`described for the seal 31 in Figure 3. Also, the sealing ring 31 has the same line contacts with the body and disc in closed posi-tion, each line contact being continuous throughout 360 degrees.
Valves made in accordance with the principles of the present invention may have one seal for one-direction flow closure and may have two back-to-back seals for closure against flow in either direction. Valves in which`two C-shaped sections have been successfully tested are substan-tially as illustrated in Figure 3 of the drawing. The orientation of the left hand ring was such that the line past the end 28 of the ring to the center marked "D" of the ring resulted in a line outwaraly such that the angle between that line and a plane perpendicular to the center-line of flow was approximately 70 (arrows "AA"). The second or right hand ring was also C-shaped and oriented such that a line from the center "E" past the end 30 of the llZ9390 ~ g resulted in a line at the arrow "B" such that the angle between the lines "BB" and a plane perpendicular to the flow axis was approximately 56. Various wall thicknesses of rings may be utilized, for example, in or about 6 and 50 thousandths inch thickness has been found satisfactory. In one such structure the rings were coated with a dead-soft silver coating capable of slight flowing to fill in any machine marks or small pores in the metal. The size of the "C" rings found satisfactory may vary such that the cross-sectional shape may be in the range of .063" to .500". Thediametrical compression of from .020 to .040" by bending of the ring part has ~een found satisfactory.
10.
Claims (13)
1. A high performance closure seal for a butter-fly valve having a body and disc offset upon a shaft so as to present a continuous disc edge adjacent the body for closure of a fluid passage through the valve, comprising:
a metallic annular seal ring of relatively thin material shaped to present a hollow interior with fluid openings upstream into such interior, a mounting on the body for said seal ring including one surface engaging the seal ring radially outwardly of the fluid passage along a circular, line contact on the exterior of the seal ring and another surface engaging the downstream exterior of the seal ring along a circular line contact opposite the upstream fluid openings to the interior of the seal ring, said seal ring being substantially free of other body contact, said body mounting exposing a circular inner seal ring surface for engaging a co-operating surface on the disc, said inner seal ring surface having a circumference slightly smaller than the circumference of said disc surface so that the seal ring is compressed upon closing the valve with no fluid pressure therein.
a metallic annular seal ring of relatively thin material shaped to present a hollow interior with fluid openings upstream into such interior, a mounting on the body for said seal ring including one surface engaging the seal ring radially outwardly of the fluid passage along a circular, line contact on the exterior of the seal ring and another surface engaging the downstream exterior of the seal ring along a circular line contact opposite the upstream fluid openings to the interior of the seal ring, said seal ring being substantially free of other body contact, said body mounting exposing a circular inner seal ring surface for engaging a co-operating surface on the disc, said inner seal ring surface having a circumference slightly smaller than the circumference of said disc surface so that the seal ring is compressed upon closing the valve with no fluid pressure therein.
2. A seal as specified in Claim 1 wherein a rigid metal ring is secured to the body to retain the seal ring, said rigid ring having the surface engaging said downstream exterior of the seal ring.
3. A seal as specified in Claim 1 wherein the surface engaging the downstream exterior of the ring is the exterior of a companion annular seal ring of similar configuration having openings to the downstream fluid pas-sage.
4. A seal as specified in Claim 3 wherein a rigid metal ring is secured to the body to retain both the seal ring and companion seal ring to the body, said rigid ring having a surface engaging the companion seal ring radially outwardly of the fluid passage along a circular line contact on the exterior of the companion seal ring.
5. A butterfly valve closure seal as specified in Claim 1, wherein said seal ring is mounted on the disc edge and is carried with the disc, said seal ring outer surface engaging a circular surface on the body upon closing disc movement across the flow passage.
6. In a high temperature, high pressure butter-fly valve having a body with a flow passage and carrying a rotable shaft mounting a disc closure in the passage, a closure seal operable between the body and disc edge in valve closed position and sealing against fluid flow, comprising:
a relatively thin overall circular metal seal member having an operable configuration portion with a shape providing a rounded inner and outer surface respective-ly at an inner diameter and at an outer diameter for substan-tially circular line contact with said body and disc edge, said seal being resiliently flexible between said line contacts and slightly compressed by closure of the disc across the flow passage, means retaining the seal in the valve, and means exposing the seal portions internally of said line contacts to upstream fluid pressure aiding seal resiliency to pressure said seal to disc edge and to valve body line contact areas.
a relatively thin overall circular metal seal member having an operable configuration portion with a shape providing a rounded inner and outer surface respective-ly at an inner diameter and at an outer diameter for substan-tially circular line contact with said body and disc edge, said seal being resiliently flexible between said line contacts and slightly compressed by closure of the disc across the flow passage, means retaining the seal in the valve, and means exposing the seal portions internally of said line contacts to upstream fluid pressure aiding seal resiliency to pressure said seal to disc edge and to valve body line contact areas.
7. A closure seal for a valve as specified in Claim 6 wherein a pair of said seal members are mounted back-to-back in line contact with each other and each member having an interior respectively exposed to fluid within the flow passage on an opposite side of the disc when closed,
8. A closure seal as specified in Claim 7 wherein each seal member has an at rest diameter with the valve open to provide slight compression of each such member upon valve closing to seal between such disc and body at negative to zero fluid pressure in the flow pas-sage.
9. A closure seal as specified in Claim 6 wherein a pair of seal members are provided, each circular with a C-shaped cross-sectional shape and mounted with the central portions in line contact with the openings in the rings facing in opposite directions.
10. A closure seal as specified in Claim 9 wherein the pair of seal rings are mounted in the body, each ring having line contact with the body and an exposed rounded interior surface for line contact with the disc edge.
11. A closure seal as specified in Claim 6 wherein said means retaining the seal in the valve is a removable rigid metal ring having an inner diameter sur-face and parallel radial surfaces at. each extremity of the inner surface, said rigid ring being reversibly mountable in the valve to retain alternatively a single and a pair of seal rings.
12. A closure seal between a disc edge and body of a butterfly-type valve useful in high temperature, high pressure service, wherein the valve has a cooperating sur-face on one of the disc edge and body and a sealing ring carried by the other of the disc edge and body and position-able to engage and seal throughout 360 in valve closed position, comprising:
a sealing ring of continuous circular annulus shape formed of metal rounded in cross section and hollow for resilience by bending, such ring having an upstream opening to fluid for pressurizing the hollow of the sealing ring, said sealing ring having exterior spaced surfaces providing at least three spaced circular lines of sealing contact with valve components, such contact lines being a first against the valve body, a second against the valve disc and the third intermediate the first and second to retain the ring in valve mounted position, said sealing ring being sized for slight compres-sion upon valve closure moving said first and second line contact areas closer together, flow passage fluid pressure entering the interior of said ring pressing said first and second line contacts areas apart to engage the seal ring more firmly against the valve body and disc.
a sealing ring of continuous circular annulus shape formed of metal rounded in cross section and hollow for resilience by bending, such ring having an upstream opening to fluid for pressurizing the hollow of the sealing ring, said sealing ring having exterior spaced surfaces providing at least three spaced circular lines of sealing contact with valve components, such contact lines being a first against the valve body, a second against the valve disc and the third intermediate the first and second to retain the ring in valve mounted position, said sealing ring being sized for slight compres-sion upon valve closure moving said first and second line contact areas closer together, flow passage fluid pressure entering the interior of said ring pressing said first and second line contacts areas apart to engage the seal ring more firmly against the valve body and disc.
13. A closure seal for a valve as specified in Claim 12 wherein the seal ring is C-shaped in cross-section with about a 90° opening between ends of the C-shape and with one end of the C-shape located inwardly toward the flow path oriented between about 56 ° to 70° from a plane through the center of the seal ring perpendicular to the centerline of the flow path.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4757879A | 1979-06-11 | 1979-06-11 | |
| US47,578 | 1979-06-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1129390A true CA1129390A (en) | 1982-08-10 |
Family
ID=21949784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA353,656A Expired CA1129390A (en) | 1979-06-11 | 1980-06-06 | High performance butterfly valve seal closure |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS566961A (en) |
| BE (1) | BE883777A (en) |
| CA (1) | CA1129390A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58187660A (en) * | 1982-04-19 | 1983-11-01 | アムステツド・インダストリ−ス・インコ−ポレ−テツド | High-performance butterfly valve sealing device |
| CN104653792A (en) * | 2013-11-25 | 2015-05-27 | 山西浩宇阀门科技有限公司 | High-temperature and high-pressure seal butterfly valve |
-
1980
- 1980-06-06 CA CA353,656A patent/CA1129390A/en not_active Expired
- 1980-06-10 JP JP7830380A patent/JPS566961A/en active Pending
- 1980-06-11 BE BE0/201006A patent/BE883777A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| JPS566961A (en) | 1981-01-24 |
| BE883777A (en) | 1980-10-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |