CA1127499A - Relief valve isolating apparatus - Google Patents
Relief valve isolating apparatusInfo
- Publication number
- CA1127499A CA1127499A CA334,375A CA334375A CA1127499A CA 1127499 A CA1127499 A CA 1127499A CA 334375 A CA334375 A CA 334375A CA 1127499 A CA1127499 A CA 1127499A
- Authority
- CA
- Canada
- Prior art keywords
- rupture disc
- annular
- support body
- relief valve
- flange
- 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
- 239000012530 fluid Substances 0.000 claims abstract description 35
- 230000007704 transition Effects 0.000 claims abstract description 23
- 230000002441 reversible effect Effects 0.000 claims abstract description 14
- 208000003629 Rupture Diseases 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims description 7
- 201000004356 excessive tearing Diseases 0.000 claims description 5
- 238000003466 welding Methods 0.000 abstract description 3
- 239000012634 fragment Substances 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 2
- 241001237728 Precis Species 0.000 description 1
- 208000036366 Sensation of pressure Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
-
- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
- F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
- F16K17/1606—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the reverse-buckling-type
-
- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
- F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
- F16K17/1606—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the reverse-buckling-type
- F16K17/1613—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the reverse-buckling-type with additional cutting means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
ABSTRACT
A one-piece fluid pressure rupturable relief e valve isolating apparatus comprised of a cylindrical sup-port body having a flat annular margin of a scored concave-convex reverse buckling rupture disc welded to one end, a flat annular ring being welded between the disc and the support body so as to project interiorly of a transition between the concave-convex and flat marginal portions of the disc. The arrangement permits a welded structure with-out the welding operation substantially affecting the rup-ture pressure of the disc whilst reducing the risk of separation of fragments of the disc on rupture.
A one-piece fluid pressure rupturable relief e valve isolating apparatus comprised of a cylindrical sup-port body having a flat annular margin of a scored concave-convex reverse buckling rupture disc welded to one end, a flat annular ring being welded between the disc and the support body so as to project interiorly of a transition between the concave-convex and flat marginal portions of the disc. The arrangement permits a welded structure with-out the welding operation substantially affecting the rup-ture pressure of the disc whilst reducing the risk of separation of fragments of the disc on rupture.
Description
IMPROVED RELIEF VALVE APPARATUS
Bac]cground of the Invention 1. Field of the Invention The present inventiQn relates to an i~pro~ed relief valve isolatin~ apparatus, and more particularly, but not by way of limitation, to a one~oiece relief valve isolating apparatus which includes a scored reverse buckling rupture disk.
Bac]cground of the Invention 1. Field of the Invention The present inventiQn relates to an i~pro~ed relief valve isolatin~ apparatus, and more particularly, but not by way of limitation, to a one~oiece relief valve isolating apparatus which includes a scored reverse buckling rupture disk.
2. Description of the Prior Art Spring operated relief valves are commonly used in process facilities to protect vessels or systems containing fluid pressure from reaching overpressure conditions. Such relief valves are connected directl~ to the vessels or systems containing fluid pressure without shut-off valves therebetween so that they cannot be inadvertently removed from service. While safety pressure relief devices of the rupture disk type are generally also uti-lized to provide backup overpressure protection to the vesselsor systems, the relief valves are usually set to relieve at a lower pressure than the rupture disk devices since relief valves automatically close after an overpressure condition has been re-lieved thereby avoiding the necessity of interrupting operations ~0 to replace parts, etc.
In applications where relief valves are continously exposed to f~uids under pressure, a number of difficulties have been en~
countered. For example, the valve seats often wear or corrode causing fluids to leak through the relief valve and/or causing improper operation of the relief valve. As a result, safety codes have been adopted which require periodic testing and maintenance of relief valves which in turn often requires interrupting opera-tions associated with the vessels or systems ~eing protected.
As a result of the above-mentioned difficulties and testing requirements, relief valve isolating apparatus of the rupturable type haye been developed and used. Such appar~tus is installed between the relief valve and the vessel or system containing fluid pressure and includes a rupturable member which isolates the re-lief valve seat and internal port~ons o~ the relief valve from the fluid under pressure~ The rupturable member of relief valve isolating apparatus is designed to rupture at a pressure slightly less or equal to the pressure at which the relief valve is set to open so that when an overpressure condition exists, the rupturable member ruptures allowing tlle 1uid under pressure to enter the relief valve which in turn causes the relief valve to open.
Relief valve isolating apparatus utilized heretofore have often been of a si7.e such that when installed in an existing system wherein a conduit is connected to the outlet port of the relief valve, the relief valve is elevated which requires changes to the outlet piping. The difficulty and expense of such changes have often discouraged the use of relief valve isolating apparatus in existing relief valve systems.
In addition, relief valve isolating apparatus utilized here-tofore haYe been comprised of several parts which must be assembled at the time the apparatus is installed. Consequently, mistakes can be made in the assembly of such apparatus which prevent the apparatus from operating properly, e.g., installing the rupture disk upside-down, misalignment of the rupture disk, etc. Further, the entire assembly can be installed incorrectly.
By the present invention, an improved relief valve isolating apparatus is provided which is of one-piece construction, which cannot be installed incorrectly and which minimizes changes re-quired to downstream piping of existing systems.
Summary o~ the Invention Fluid pressure rupturable relief valve isolating apparatus for installation between the annular seating surface of the inlet nozzle of a fluid pressure relief valve and the corresponding annular seating surface of the inle-t flange to which the relief valve and inlet nozzle connect compri-ses a support body having an annular flat flange portion for engaging the annular seating surfaces of the inlet nozzle and the inlet flange and a cylindrical portion posi-tioned interiorly of the annular flat flange portion for extension into the interior of the inlet flange. A scored reverse buckling rupture disc includes an annular flange portion seal welded to the end of said cylindrical portion of said support body whereby said cylindrical portion is closed by said rupture disc; a concave-convex portion having at least one score formed in a surface thereof for causing said rupture disc to reverse from a centre portion thereof outwardly when the reversal pressure thereof is exceeded so that no change occurs in the reversal pressure of said rupture disc when said annular flange portion of said rupture disc is seal welded to said cylindrical por-~0 tion of said support body; and an annular transition con-nection connecting said annular flange portion of said rupture disc to said concave-convex portion of said rup-ture disc. A flat ring is positioned between and welded to one end of said cylindrical portion of said support body and said annular flange portion of said rupture disc, said ring extending into said cylindrical portion of said body interiorly of said transition connection of said rupture disc so that said flat ring contacts the concave-convex portion of said rupture disc at a point a distance away from said transition connection of said rupture disc upon the reversal and rupture of said rupture disc to thereby prevent excessive tearing thereof.
_~
~ ~J'~ 3 It is, therefore, a general object of the present invention to provide an improved relief valve isolating apparatus.
A further object of the present invention is the provision of a one-piece fluid pressure rupturable relief valve isolating apparatus which may be installed with mini-mum changes to downstream piping in existing systems upon installation of the apparatus.
~ et a further object of the present invention is the provision of a one-piece fluid pressure rupturable relief valve isolating apparatus which cannot be installed incorrectly and which obviates problems heretofore encoun-tered with misalignment during assembly and/or installation.
Another object of the present inVentiQn is the provision of a one-piece fluid pressure rupturable relief valve insolating apparatus which when installed between the inlet nozzle of a relief valve and the inlet flange to which the relief valve connects, can position the rupture disc thereof a sufficient distance from the inlet nozzle whereby full opening of the rupture disc is insuxed.
Other and further objects, features and advantayes of the present invention will become readily apparent to those skilled in the /
-4a-art upon a reading of the description o~ pre~erred embodi~ents which follo~s when ta}~en ;~n conjunction w~th t~e accompanyin~
drawings~
~rief Description of the Drawings FIGURE 1 is a side partially sectional view of a conventional relief valve connected to an inlet flange with the apparatus of the present invention positioned therebetween~
FIGURE 2 is an enlarged sectional view of a portion of the apparatus of FIGURE 1 illustrating the apparatus of the present invention after the rupture thereof.
FIGURE 3 is a perspective view of the various parts of the apparatus of the present invention prior to welding such parts together.
Description of Preferred Embodiments 1~ Referring now to the drawings and particularly to FIGURE 1, the apparatus of the present invention, generally designated by the ' numeral 10, is illustrated installed between a conventional relief valve 12 and the inlet flange 14 thereof~ While relief valves of various designs are commercially available, they generally all in-~0 clude the basic structure illustrated in FIGURE 1. That is, the relief valve 12 includes a body 16 having a flange 18 adapted for connection to the inlet flange 14 by a plurality of studs and nuts.
An outlet flange 20 is provided adapted to be connected to a com-plementary flange which can in turn be attached to downstream piping ~5 (not shown~ for conducting fluids flowing through the relief valve 12 to a desired area. The valve closure apparatus of the relief valve 12 includes an inlet nozzle 22 which is usually threadedly connected to the interior of the flange 18 and projects into the interior of the body 16~ The upper end 24 of the nozzle 22 termi-nates in a circular port which suppoxts and seals against a valve --5~
s~
closure means 26, The lower end of the nozzle 22 includes an annular flange portion 28 which proyides a downwardly ~acing annu-lar seaing surface 30 for enga~ing an upwardly facing annular seating surface 32 provided on the inlet flange 1~.
The valve seat means 26 is comprised of a valve closure member 36 which is in turn connected to a pushrod 3B. The upper end por-tion of the pushrod 38 is slidably disposed within a sleeve 39 connected through a plate 40~ The plate 40 ~-unctions to close the valve body 16 and divert fluids flowiny through the inlet nozzle 22 to the outlet flange 20~
A spring housing 42 is bolted to the body 16 and a spring biasing means 44 is disposed therein. The spring biasing means 44 is generally comprised of a valve stem 46 which is slidably mounted longitudinally within the housing 42~ The lower end 48 of the valve stem 46 is formed in a bulbous shape and bears against the top of the pushrod 38~ The upper end 50 o~ the valve stem 46 is reciprocally mounted within a spring adjustment sleeve 52 threadedly connected to the housing 42~ Upper and lower spring buttons 54 and 56 are slidably mounted on the valve stem 46 and a spring 58 is disposed between the buttons 54 and 56 around the valve stem 46.
As will be understood, the spring 58 bears against the spring buttons 54 and 56 which in turn urges the valve stem 46 and the valve clo-sure means 26 into the closed position. The spring pressure exerted on the valve stem 46 and valve closure means 26 is increased or decreased by rotating the threaded sleeve 52 whereby it is moved downwardly or upwardly.
In operation of the relief valve 12, when the ~luid pressure exerted within the nozzle 22 against the valve closure means 26 reaches a level whereby an upward ~orce is exerted on the valve closure means 26 greater than the downward ~orce exerted thereon by the spring 58, the valve closure means 26 is moved inwardly opening the valve closure means whereby fluid flows -through the nozzle 22, through the valve body 16 and through the outlet flange 20.
As illustrated in FIGURES 1 and 2~ the apparatus 10 of the present invention is mounted between the inlet nozzle 22 of the relief valve 12 and the inlet flange 14 to which the relief valve connects, Because the portion of the apparatus 10 clamped between the nozzle 22 and the inlet flange 14 is thin, its installation elevates the relief valve 12 with respect to the inlet flange 14 only a minor distance which obviates or at least minimizes changes required to downstream piping in an existing system~
As best shown in FIGURES 2 and 3, the apparatus 10 is comprised of parts which are welded together to form a one-piece relief valve lS isolating apparatus. More specifically, the apparatus lQ is com-prised of a support body 60 having an annular flat flange portion 62 and a cylindrical portion 64 positioned interiorly of the flange portion 62~ A flat ring 66 and a scored reverse buckling rupture disk 68 are seal welded over the end 70 of the cylin-drical portion 64 of the support body whereby the cylindricalportion 64 is closed by the rupture di`sk 68, A cylindrical shield 72 for protecting the rupture disk 68 from damage during handling and installation is optionally welded to the rupture disk 68.
Preferably~ the shield 72 is of the same internal diameter and thickness as the cylindrical portion 64 of the support body 60.
The scored reverse buc~ing rupture disk 68 includes an annular flange portion 74 connected to a concave-convex portion 76 by an annular transition connection 78. A plurality of scores 80 are formed on a surface of the concave-convex portion 76 of the rupture disk 68 so that lines of weakness are formed in the concave-9~3 convex portion 76. Preferably, four scores 80 are provided whichradiate outwardly from the center of the concave-convex portion 76 whereby the concave-convex por-tion is divided into quadrants thereby.
The diameter o~ the concave-convex portion 76 of the rupture disk 68 is preferably equal to or only slightly less than the in-ternal diameter of the cylindrical portion 64 of the support body 60, and the annular flange portion 74 thereof is seal welded to the end 70 of the cylindrical portion 64. The ring 66 has an in-ternal diameter such that it extends into the interior of the cylindrical portion 64 of the body 60 a distance in the range of from about 1/16 inch to about 1/8 inch past the transition con-nection 78 of the rupture disk 68. In a preferred embodiment of the apparatus 10, the rupture disk 68, shield 72 and ring 66, if used, are welded to the end 70 of the cylindrical portion 64 of the support body 62 by a single continuous weld as illustrated in FIGURE 2.
The inclusion of the ring 66 in the apparatus 10 has been found in smaller sizes of the apparatus 10, i.e., sizes for use with 3 inch and smaller relief valves, to prevent excessive tearing of the rupture disk 68 and the formation of loose pieces thereof when the rupture disk reverses and ruptures. Also, the ring 66 helps prevent abnormal operation of the rupture disk 68 due to misalign~
ment of the rupture disk, etc., by providing a support for the tran-sition connection 78 thereof. Without such support erratic rupture can occur, i.e., reversal which starts at the transition connection 78 instead of near the center of the concave-convex portion 76 of the rupture disk 68 bringing about only partial opening or other adverse effect. More specifically, the ring 66 provides an inwardly extending shoulder which supports the transition connection and ~round which portions of -tlle rup-ture disk bend thereby preventing excessive tearing and/or erratic rupture of the rupture disk. When fluid pressure exerted on the convex side o~ the rup~ure disk ex-ceeds the design rupture pressure of the disk, the disk reverses itself and tears along the lines of weakness formed by the scores 80 whereby petals 82 are formed which bend upwardly adjacent the interior surfaces of the cylindrical por-tion 6~ of the support body 62, as shown in FIGURE 2. As the petals 82 bend upwardly, some tearing of the petals takes place at the areas designated by the numeral 83 in Figure 2, i.e., on both sides of each petal at the transition connection 78. In the smaller sizes of the apparatus 10, if the ring 66 is not utilized one or more of the petals 82 can tear completely away from the annular flange portion 7~ of the rup-ture disk 68 at the transition connection 78 thereof because of the small radius of curvature of the transition connection. The in-wardly extending ring 66 prevents such complete tearing by causing the petals 82 to bend around the ring 66 at a point a distance away fro~ the transition connection. In larger sizes of the apparatus 10, the radius of curvature of the transition connection 78 is ~0 large enough that complete tearing at the transition connection does not take place and the ring 66 is not required ~or this reason.
When a reverse buckling rupture disk without scores is welded to a support member in the manner described herein, the consequent heating of the rupture disk produces stresses therein/ pa~ticularly at the transition connection area, which materially change the operation of the disk, i.e., the fluid pressure required to cause the disk to reverse. For example, a reverse buckling rupture disk assembly which includes knife blades for severing the disk upon reversal cannot be welded to a support member without changin~ the reversal pressure of the disk, o~ten drastically. However, it has been found that because a ~cored reYerse bucklin~ rupture disk re~
verses from the cente~ portion of the disk out~ardly i.nstead of from the transition connection inwardly as do other re~erse buckling disks, the stresses produced at the transit~on connection area do not affect the operation of the disk, and thus, the apparatus of the present invention operates reliably~
Upon assem~ly of the Yarious parts of the apparatus 10 and welding of the parts together, a one-piece pressure rupturable relief valve isolating apparatus is provided which cannot be in-stalled upside-down and which does not have to be precisionally aligned in order to achieye proper operation~ As shown in FIGURES
1 and 2, the apparatus 10 is installed in a fluid pressure relief system so that pressurized fluids are isolated by the apparatus 10 from the internal portions of the relief valve 12. That is, the cylindrical portion of the apparatus 10~ iqe., the cylindrical por-tion 64 of the support body 60 and the cylindrical shield 72 is positioned within the interior of the inlet flange 14 so that the annular flat flange portion 62 of the support body 60 is positioned between the annular seating surfaces of the inlet flange 14 and the nozzle 22 of the relief valve 12. Because the cylindrical portion of the apparatus 10 which extends into the interior of the inlet flange 14 is of a greater diameter than the internal diameter of the nozzle 22, the apparatus 10 cannot be installed upside-down between the inlet flange 14 and the relief valve 12. Further, the alignment of the rupture disk 68 and support ring 66, if used, with respect to the support body 60 is preci.sionally set at the factory and alignment of the apparatus 10 between the relief ~alve 12 and inlet flange 14 is not necessary~ ~lso, the length of the cylin-drical portion 64 of the support body 60 is selected so that the rupture disk 68 ~elded ko the end 70 thereof is positioned a ~LZ~ 3 sufficient distanc~ belo~ the inlet nozzle 22 Q~ the relief y~lye 12 whereby full open~n~ o~ the rupture disk is insured, i..e~, the petals 82 are not preYented from openi~ng ~ully ~y contact with the smaller dia~eter inlet nozzle 22.
The inlet flange 14 is clamped to the flange 18 of the relief valve 12 by a plurality of studs and nuts and the apparatus 10 is rigidly clamped between the flange portion 28 of the nozzle 22 and the inlet flange 14~ A pair of conventional gaskets 84 can be utilized between the annular flange portion 62 of the support body 60 and the seating surfaces of the inlet flange 14 and nozzle 22 to provide a pressure seal and prevent fluid under pressure from escaping to the atmosphere~
As illustrated in FIGURES 1, the convex side of the scored reverse buckling rupture disk 68 is exposed to the fluid under pres-sure within the system being protected and the fluid is prevented from entering the inlet nozzle 22 of the relief valve 12 by the apparatus 10. The rupture characteristics of the rupture disk 68 are selected so that reversal and rupture of the rupture disk take place at a fluid pressure slightly less or equal to the fluid pres-~0 sure at which the relief valve 12 is set to open. Consequently, the fluid under pressure does not reach the internal portions of the relief valve 12 until an overpressure condition is reached in the system being protected whereupon the rupture disk 68 reverses and ruptures as illustrated in FIGURE 2~ Upon rupture, the fluid under pressure enters the inlet nozzle 22 of the relief valve 12 and the val~e closure means 26 thereof opens to relieve the over-pressure condit~on, As is understood by tho~e skilled in the art, the reverse buckling rupture disk 68 can withstand a greater fluid pressure exerted on the CQnCaVe sLde of the concave-convex portion 76 --1~.--thereof than on the conyex side t~ereof~ This allow~ the relief valve 12 to be per~odically tested bX applyin~ fluid pressure with-in the ~nternal portion of the nozzle 22 without rupturing the rup-ture disk 68 of the apparatus 10 and without disassembly of the pressure relief system or removal of the relief valve 12 from the system. More particularly, a passageway 100 is provided in the flange portion 2~ of the nozzle 22 communicatin~ the internal por-tion of the nozzle 22 with the external portion of the flange ~8 thereof~ A conduit 102 is connected to the passageway 100 and as illustrated in FIGURE 1 to a port of a four-way valve 104 or other similar valving arrangement. A source of fluid pressure is con-nected to a port of the valve 104 by a conduit 106 and a pressure gauge 108 is connected to another port of the valve 104~ A conduit 110 is connected to the fourth port of the valve 104 and to a vent.
In testing the relief valve 12, the valve 104 is operated so that the fluid under pressure from the source thereof flows by way of the conduit 106 to the internal portion of the relief valve inlet nozzle 22. The fluid pressure exerted within the nozzle 22 is observed on the pressure gauge 108 and is increased until the valve closure means 26 opens. Once the relief valve 12 has been tested and has been adjusted to open at the desired pressure level if necessary, the valve means 104 is operated so that the fluid under pressure is vented from the relief valve 12 by way of the conduits 102 and 110 .
As mentioned above, the annular flange portion 62 of the sup-port body 60 is formed of minimum thickness whereby the installation of the apparatus 10 elevates the relief valve 12 with respect to the inlet flange 14 as little as possible~
Thus, the ~resent invention is well adapted to carry out the objects and attain the ends and advantages mentioned as well as ,7'~
those inherent therein~ ~hile numerous changes c~n be made in the construction ~nd arrangement of the appaxatus of the present inYen-tion, such changes are within the spirit of this invention as de=
fined by the appended claims~
In applications where relief valves are continously exposed to f~uids under pressure, a number of difficulties have been en~
countered. For example, the valve seats often wear or corrode causing fluids to leak through the relief valve and/or causing improper operation of the relief valve. As a result, safety codes have been adopted which require periodic testing and maintenance of relief valves which in turn often requires interrupting opera-tions associated with the vessels or systems ~eing protected.
As a result of the above-mentioned difficulties and testing requirements, relief valve isolating apparatus of the rupturable type haye been developed and used. Such appar~tus is installed between the relief valve and the vessel or system containing fluid pressure and includes a rupturable member which isolates the re-lief valve seat and internal port~ons o~ the relief valve from the fluid under pressure~ The rupturable member of relief valve isolating apparatus is designed to rupture at a pressure slightly less or equal to the pressure at which the relief valve is set to open so that when an overpressure condition exists, the rupturable member ruptures allowing tlle 1uid under pressure to enter the relief valve which in turn causes the relief valve to open.
Relief valve isolating apparatus utilized heretofore have often been of a si7.e such that when installed in an existing system wherein a conduit is connected to the outlet port of the relief valve, the relief valve is elevated which requires changes to the outlet piping. The difficulty and expense of such changes have often discouraged the use of relief valve isolating apparatus in existing relief valve systems.
In addition, relief valve isolating apparatus utilized here-tofore haYe been comprised of several parts which must be assembled at the time the apparatus is installed. Consequently, mistakes can be made in the assembly of such apparatus which prevent the apparatus from operating properly, e.g., installing the rupture disk upside-down, misalignment of the rupture disk, etc. Further, the entire assembly can be installed incorrectly.
By the present invention, an improved relief valve isolating apparatus is provided which is of one-piece construction, which cannot be installed incorrectly and which minimizes changes re-quired to downstream piping of existing systems.
Summary o~ the Invention Fluid pressure rupturable relief valve isolating apparatus for installation between the annular seating surface of the inlet nozzle of a fluid pressure relief valve and the corresponding annular seating surface of the inle-t flange to which the relief valve and inlet nozzle connect compri-ses a support body having an annular flat flange portion for engaging the annular seating surfaces of the inlet nozzle and the inlet flange and a cylindrical portion posi-tioned interiorly of the annular flat flange portion for extension into the interior of the inlet flange. A scored reverse buckling rupture disc includes an annular flange portion seal welded to the end of said cylindrical portion of said support body whereby said cylindrical portion is closed by said rupture disc; a concave-convex portion having at least one score formed in a surface thereof for causing said rupture disc to reverse from a centre portion thereof outwardly when the reversal pressure thereof is exceeded so that no change occurs in the reversal pressure of said rupture disc when said annular flange portion of said rupture disc is seal welded to said cylindrical por-~0 tion of said support body; and an annular transition con-nection connecting said annular flange portion of said rupture disc to said concave-convex portion of said rup-ture disc. A flat ring is positioned between and welded to one end of said cylindrical portion of said support body and said annular flange portion of said rupture disc, said ring extending into said cylindrical portion of said body interiorly of said transition connection of said rupture disc so that said flat ring contacts the concave-convex portion of said rupture disc at a point a distance away from said transition connection of said rupture disc upon the reversal and rupture of said rupture disc to thereby prevent excessive tearing thereof.
_~
~ ~J'~ 3 It is, therefore, a general object of the present invention to provide an improved relief valve isolating apparatus.
A further object of the present invention is the provision of a one-piece fluid pressure rupturable relief valve isolating apparatus which may be installed with mini-mum changes to downstream piping in existing systems upon installation of the apparatus.
~ et a further object of the present invention is the provision of a one-piece fluid pressure rupturable relief valve isolating apparatus which cannot be installed incorrectly and which obviates problems heretofore encoun-tered with misalignment during assembly and/or installation.
Another object of the present inVentiQn is the provision of a one-piece fluid pressure rupturable relief valve insolating apparatus which when installed between the inlet nozzle of a relief valve and the inlet flange to which the relief valve connects, can position the rupture disc thereof a sufficient distance from the inlet nozzle whereby full opening of the rupture disc is insuxed.
Other and further objects, features and advantayes of the present invention will become readily apparent to those skilled in the /
-4a-art upon a reading of the description o~ pre~erred embodi~ents which follo~s when ta}~en ;~n conjunction w~th t~e accompanyin~
drawings~
~rief Description of the Drawings FIGURE 1 is a side partially sectional view of a conventional relief valve connected to an inlet flange with the apparatus of the present invention positioned therebetween~
FIGURE 2 is an enlarged sectional view of a portion of the apparatus of FIGURE 1 illustrating the apparatus of the present invention after the rupture thereof.
FIGURE 3 is a perspective view of the various parts of the apparatus of the present invention prior to welding such parts together.
Description of Preferred Embodiments 1~ Referring now to the drawings and particularly to FIGURE 1, the apparatus of the present invention, generally designated by the ' numeral 10, is illustrated installed between a conventional relief valve 12 and the inlet flange 14 thereof~ While relief valves of various designs are commercially available, they generally all in-~0 clude the basic structure illustrated in FIGURE 1. That is, the relief valve 12 includes a body 16 having a flange 18 adapted for connection to the inlet flange 14 by a plurality of studs and nuts.
An outlet flange 20 is provided adapted to be connected to a com-plementary flange which can in turn be attached to downstream piping ~5 (not shown~ for conducting fluids flowing through the relief valve 12 to a desired area. The valve closure apparatus of the relief valve 12 includes an inlet nozzle 22 which is usually threadedly connected to the interior of the flange 18 and projects into the interior of the body 16~ The upper end 24 of the nozzle 22 termi-nates in a circular port which suppoxts and seals against a valve --5~
s~
closure means 26, The lower end of the nozzle 22 includes an annular flange portion 28 which proyides a downwardly ~acing annu-lar seaing surface 30 for enga~ing an upwardly facing annular seating surface 32 provided on the inlet flange 1~.
The valve seat means 26 is comprised of a valve closure member 36 which is in turn connected to a pushrod 3B. The upper end por-tion of the pushrod 38 is slidably disposed within a sleeve 39 connected through a plate 40~ The plate 40 ~-unctions to close the valve body 16 and divert fluids flowiny through the inlet nozzle 22 to the outlet flange 20~
A spring housing 42 is bolted to the body 16 and a spring biasing means 44 is disposed therein. The spring biasing means 44 is generally comprised of a valve stem 46 which is slidably mounted longitudinally within the housing 42~ The lower end 48 of the valve stem 46 is formed in a bulbous shape and bears against the top of the pushrod 38~ The upper end 50 o~ the valve stem 46 is reciprocally mounted within a spring adjustment sleeve 52 threadedly connected to the housing 42~ Upper and lower spring buttons 54 and 56 are slidably mounted on the valve stem 46 and a spring 58 is disposed between the buttons 54 and 56 around the valve stem 46.
As will be understood, the spring 58 bears against the spring buttons 54 and 56 which in turn urges the valve stem 46 and the valve clo-sure means 26 into the closed position. The spring pressure exerted on the valve stem 46 and valve closure means 26 is increased or decreased by rotating the threaded sleeve 52 whereby it is moved downwardly or upwardly.
In operation of the relief valve 12, when the ~luid pressure exerted within the nozzle 22 against the valve closure means 26 reaches a level whereby an upward ~orce is exerted on the valve closure means 26 greater than the downward ~orce exerted thereon by the spring 58, the valve closure means 26 is moved inwardly opening the valve closure means whereby fluid flows -through the nozzle 22, through the valve body 16 and through the outlet flange 20.
As illustrated in FIGURES 1 and 2~ the apparatus 10 of the present invention is mounted between the inlet nozzle 22 of the relief valve 12 and the inlet flange 14 to which the relief valve connects, Because the portion of the apparatus 10 clamped between the nozzle 22 and the inlet flange 14 is thin, its installation elevates the relief valve 12 with respect to the inlet flange 14 only a minor distance which obviates or at least minimizes changes required to downstream piping in an existing system~
As best shown in FIGURES 2 and 3, the apparatus 10 is comprised of parts which are welded together to form a one-piece relief valve lS isolating apparatus. More specifically, the apparatus lQ is com-prised of a support body 60 having an annular flat flange portion 62 and a cylindrical portion 64 positioned interiorly of the flange portion 62~ A flat ring 66 and a scored reverse buckling rupture disk 68 are seal welded over the end 70 of the cylin-drical portion 64 of the support body whereby the cylindricalportion 64 is closed by the rupture di`sk 68, A cylindrical shield 72 for protecting the rupture disk 68 from damage during handling and installation is optionally welded to the rupture disk 68.
Preferably~ the shield 72 is of the same internal diameter and thickness as the cylindrical portion 64 of the support body 60.
The scored reverse buc~ing rupture disk 68 includes an annular flange portion 74 connected to a concave-convex portion 76 by an annular transition connection 78. A plurality of scores 80 are formed on a surface of the concave-convex portion 76 of the rupture disk 68 so that lines of weakness are formed in the concave-9~3 convex portion 76. Preferably, four scores 80 are provided whichradiate outwardly from the center of the concave-convex portion 76 whereby the concave-convex por-tion is divided into quadrants thereby.
The diameter o~ the concave-convex portion 76 of the rupture disk 68 is preferably equal to or only slightly less than the in-ternal diameter of the cylindrical portion 64 of the support body 60, and the annular flange portion 74 thereof is seal welded to the end 70 of the cylindrical portion 64. The ring 66 has an in-ternal diameter such that it extends into the interior of the cylindrical portion 64 of the body 60 a distance in the range of from about 1/16 inch to about 1/8 inch past the transition con-nection 78 of the rupture disk 68. In a preferred embodiment of the apparatus 10, the rupture disk 68, shield 72 and ring 66, if used, are welded to the end 70 of the cylindrical portion 64 of the support body 62 by a single continuous weld as illustrated in FIGURE 2.
The inclusion of the ring 66 in the apparatus 10 has been found in smaller sizes of the apparatus 10, i.e., sizes for use with 3 inch and smaller relief valves, to prevent excessive tearing of the rupture disk 68 and the formation of loose pieces thereof when the rupture disk reverses and ruptures. Also, the ring 66 helps prevent abnormal operation of the rupture disk 68 due to misalign~
ment of the rupture disk, etc., by providing a support for the tran-sition connection 78 thereof. Without such support erratic rupture can occur, i.e., reversal which starts at the transition connection 78 instead of near the center of the concave-convex portion 76 of the rupture disk 68 bringing about only partial opening or other adverse effect. More specifically, the ring 66 provides an inwardly extending shoulder which supports the transition connection and ~round which portions of -tlle rup-ture disk bend thereby preventing excessive tearing and/or erratic rupture of the rupture disk. When fluid pressure exerted on the convex side o~ the rup~ure disk ex-ceeds the design rupture pressure of the disk, the disk reverses itself and tears along the lines of weakness formed by the scores 80 whereby petals 82 are formed which bend upwardly adjacent the interior surfaces of the cylindrical por-tion 6~ of the support body 62, as shown in FIGURE 2. As the petals 82 bend upwardly, some tearing of the petals takes place at the areas designated by the numeral 83 in Figure 2, i.e., on both sides of each petal at the transition connection 78. In the smaller sizes of the apparatus 10, if the ring 66 is not utilized one or more of the petals 82 can tear completely away from the annular flange portion 7~ of the rup-ture disk 68 at the transition connection 78 thereof because of the small radius of curvature of the transition connection. The in-wardly extending ring 66 prevents such complete tearing by causing the petals 82 to bend around the ring 66 at a point a distance away fro~ the transition connection. In larger sizes of the apparatus 10, the radius of curvature of the transition connection 78 is ~0 large enough that complete tearing at the transition connection does not take place and the ring 66 is not required ~or this reason.
When a reverse buckling rupture disk without scores is welded to a support member in the manner described herein, the consequent heating of the rupture disk produces stresses therein/ pa~ticularly at the transition connection area, which materially change the operation of the disk, i.e., the fluid pressure required to cause the disk to reverse. For example, a reverse buckling rupture disk assembly which includes knife blades for severing the disk upon reversal cannot be welded to a support member without changin~ the reversal pressure of the disk, o~ten drastically. However, it has been found that because a ~cored reYerse bucklin~ rupture disk re~
verses from the cente~ portion of the disk out~ardly i.nstead of from the transition connection inwardly as do other re~erse buckling disks, the stresses produced at the transit~on connection area do not affect the operation of the disk, and thus, the apparatus of the present invention operates reliably~
Upon assem~ly of the Yarious parts of the apparatus 10 and welding of the parts together, a one-piece pressure rupturable relief valve isolating apparatus is provided which cannot be in-stalled upside-down and which does not have to be precisionally aligned in order to achieye proper operation~ As shown in FIGURES
1 and 2, the apparatus 10 is installed in a fluid pressure relief system so that pressurized fluids are isolated by the apparatus 10 from the internal portions of the relief valve 12. That is, the cylindrical portion of the apparatus 10~ iqe., the cylindrical por-tion 64 of the support body 60 and the cylindrical shield 72 is positioned within the interior of the inlet flange 14 so that the annular flat flange portion 62 of the support body 60 is positioned between the annular seating surfaces of the inlet flange 14 and the nozzle 22 of the relief valve 12. Because the cylindrical portion of the apparatus 10 which extends into the interior of the inlet flange 14 is of a greater diameter than the internal diameter of the nozzle 22, the apparatus 10 cannot be installed upside-down between the inlet flange 14 and the relief valve 12. Further, the alignment of the rupture disk 68 and support ring 66, if used, with respect to the support body 60 is preci.sionally set at the factory and alignment of the apparatus 10 between the relief ~alve 12 and inlet flange 14 is not necessary~ ~lso, the length of the cylin-drical portion 64 of the support body 60 is selected so that the rupture disk 68 ~elded ko the end 70 thereof is positioned a ~LZ~ 3 sufficient distanc~ belo~ the inlet nozzle 22 Q~ the relief y~lye 12 whereby full open~n~ o~ the rupture disk is insured, i..e~, the petals 82 are not preYented from openi~ng ~ully ~y contact with the smaller dia~eter inlet nozzle 22.
The inlet flange 14 is clamped to the flange 18 of the relief valve 12 by a plurality of studs and nuts and the apparatus 10 is rigidly clamped between the flange portion 28 of the nozzle 22 and the inlet flange 14~ A pair of conventional gaskets 84 can be utilized between the annular flange portion 62 of the support body 60 and the seating surfaces of the inlet flange 14 and nozzle 22 to provide a pressure seal and prevent fluid under pressure from escaping to the atmosphere~
As illustrated in FIGURES 1, the convex side of the scored reverse buckling rupture disk 68 is exposed to the fluid under pres-sure within the system being protected and the fluid is prevented from entering the inlet nozzle 22 of the relief valve 12 by the apparatus 10. The rupture characteristics of the rupture disk 68 are selected so that reversal and rupture of the rupture disk take place at a fluid pressure slightly less or equal to the fluid pres-~0 sure at which the relief valve 12 is set to open. Consequently, the fluid under pressure does not reach the internal portions of the relief valve 12 until an overpressure condition is reached in the system being protected whereupon the rupture disk 68 reverses and ruptures as illustrated in FIGURE 2~ Upon rupture, the fluid under pressure enters the inlet nozzle 22 of the relief valve 12 and the val~e closure means 26 thereof opens to relieve the over-pressure condit~on, As is understood by tho~e skilled in the art, the reverse buckling rupture disk 68 can withstand a greater fluid pressure exerted on the CQnCaVe sLde of the concave-convex portion 76 --1~.--thereof than on the conyex side t~ereof~ This allow~ the relief valve 12 to be per~odically tested bX applyin~ fluid pressure with-in the ~nternal portion of the nozzle 22 without rupturing the rup-ture disk 68 of the apparatus 10 and without disassembly of the pressure relief system or removal of the relief valve 12 from the system. More particularly, a passageway 100 is provided in the flange portion 2~ of the nozzle 22 communicatin~ the internal por-tion of the nozzle 22 with the external portion of the flange ~8 thereof~ A conduit 102 is connected to the passageway 100 and as illustrated in FIGURE 1 to a port of a four-way valve 104 or other similar valving arrangement. A source of fluid pressure is con-nected to a port of the valve 104 by a conduit 106 and a pressure gauge 108 is connected to another port of the valve 104~ A conduit 110 is connected to the fourth port of the valve 104 and to a vent.
In testing the relief valve 12, the valve 104 is operated so that the fluid under pressure from the source thereof flows by way of the conduit 106 to the internal portion of the relief valve inlet nozzle 22. The fluid pressure exerted within the nozzle 22 is observed on the pressure gauge 108 and is increased until the valve closure means 26 opens. Once the relief valve 12 has been tested and has been adjusted to open at the desired pressure level if necessary, the valve means 104 is operated so that the fluid under pressure is vented from the relief valve 12 by way of the conduits 102 and 110 .
As mentioned above, the annular flange portion 62 of the sup-port body 60 is formed of minimum thickness whereby the installation of the apparatus 10 elevates the relief valve 12 with respect to the inlet flange 14 as little as possible~
Thus, the ~resent invention is well adapted to carry out the objects and attain the ends and advantages mentioned as well as ,7'~
those inherent therein~ ~hile numerous changes c~n be made in the construction ~nd arrangement of the appaxatus of the present inYen-tion, such changes are within the spirit of this invention as de=
fined by the appended claims~
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A fluid pressure rupturable relief valve iso-lating apparatus for installation between an annular seating surface of an inlet nozzle of a fluid pressure relief valve and a corresponding annular seating surface of an inlet flange to which the relief valve and inlet nozzle connect, said apparatus comprising:
a support body having an annular flat flange por-tion for engaging said annular seating surface of said inlet flange and a cylindrical portion positioned interiorly of said flat flange portion for extension into the interior of said inlet flange; and a scored reverse buckling rupture disc, including:
an annular flange portion seal welded to the end of said cylindrical portion of said support body whereby said cylindrical portion is closed by said rupture disc;
a concave-convex portion having at least one score formed in a surface thereof for causing said rupture disc to reverse from a centre portion thereof outwardly when the reversal pressure thereof is exceeded so that no change occurs in the reversal pressure of said rupture disc when said annular flange portion of said rupture disc is seal welded to said cylindrical portion of said support body;
an annular transition connection connecting said annular flange portion of said rupture disc to said concave-convex portion of said rupture disc; and a flat ring positioned between and welded to one end of said cylindrical portion of said support body and said annular flange portion of said rupture disc, said ring extending into said cylindrical portion of said body interi-orly of said transition connection of said rupture disc so that said flat ring contacts the concave-convex portion of said rupture disc at a point a distance away from said tran-sition connection of said rupture disc upon the reversal and rupture of said rupture disc to thereby prevent exces-sive tearing thereof.
a support body having an annular flat flange por-tion for engaging said annular seating surface of said inlet flange and a cylindrical portion positioned interiorly of said flat flange portion for extension into the interior of said inlet flange; and a scored reverse buckling rupture disc, including:
an annular flange portion seal welded to the end of said cylindrical portion of said support body whereby said cylindrical portion is closed by said rupture disc;
a concave-convex portion having at least one score formed in a surface thereof for causing said rupture disc to reverse from a centre portion thereof outwardly when the reversal pressure thereof is exceeded so that no change occurs in the reversal pressure of said rupture disc when said annular flange portion of said rupture disc is seal welded to said cylindrical portion of said support body;
an annular transition connection connecting said annular flange portion of said rupture disc to said concave-convex portion of said rupture disc; and a flat ring positioned between and welded to one end of said cylindrical portion of said support body and said annular flange portion of said rupture disc, said ring extending into said cylindrical portion of said body interi-orly of said transition connection of said rupture disc so that said flat ring contacts the concave-convex portion of said rupture disc at a point a distance away from said tran-sition connection of said rupture disc upon the reversal and rupture of said rupture disc to thereby prevent exces-sive tearing thereof.
2. The apparatus of Claim 1, which is further characterized to include a cylindrical shield for protecting said rupture disc, said shield being welded to said annular flange portion of said rupture disc and to the end of said cylindrical portion of said support body.
3. The apparatus of Claim 2, wherein said cylin-drical portion of said support body and said cylindrical shield are of the same internal diameters and thicknesses.
4. A fluid pressure relief apparatus comprising:
a fluid pressure relief valve including an inlet nozzle having an annular seating surface for joining with the annular seating surface of an inlet flange;
an inlet flange having an annular seating surface for joining with the annular seating surface of the inlet nozzle of said relief valve adapted to be clamped to said relief valve;
a support body having an annular flat flange por-tion for engaging said annular seating surface of said inlet nozzle and said annular seating surface of said inlet flange and also having a cylindrical portion positioned interiorly of said annular flat flange portion for extension into the interior of said inlet flange;
a scored reverse buckling rupture disc, inclu-ding:
an annular flange portion seal welded to the end of said cylindrical portion of said support body whereby said cylindrical portion is closed by said rup-ture disc;
a concave-convex portion having at least one score formed in a surface thereof for preventing a change in the reversal pressure of said rupture disc when said annular flange portion of said rupture disc is seal welded to said cylindrical portion of said support body;
and an annular transition connection connec-ting said annular flange portion of said rupture disc to said concave-convex portion thereof;
a cylindrical shield for protecting said rup-ture disc welded to said annular flange portion of said rupture disc and to the end of said cylindrical portion of said support body; and a flat ring positioned between and welded to the end of said cylindrical portion of said support body and said annular flange portion of said rupture disc, said ring extending into said cylindrical portion of said body, interiorly of said transition connection of said rupture disc for contacting said concave-convex portion of said rupture disc at a point a distance away from said transi-tion connection of said rupture disc upon the reversal and rupture thereof so that excessive tearing of said rupture disc is prevented.
a fluid pressure relief valve including an inlet nozzle having an annular seating surface for joining with the annular seating surface of an inlet flange;
an inlet flange having an annular seating surface for joining with the annular seating surface of the inlet nozzle of said relief valve adapted to be clamped to said relief valve;
a support body having an annular flat flange por-tion for engaging said annular seating surface of said inlet nozzle and said annular seating surface of said inlet flange and also having a cylindrical portion positioned interiorly of said annular flat flange portion for extension into the interior of said inlet flange;
a scored reverse buckling rupture disc, inclu-ding:
an annular flange portion seal welded to the end of said cylindrical portion of said support body whereby said cylindrical portion is closed by said rup-ture disc;
a concave-convex portion having at least one score formed in a surface thereof for preventing a change in the reversal pressure of said rupture disc when said annular flange portion of said rupture disc is seal welded to said cylindrical portion of said support body;
and an annular transition connection connec-ting said annular flange portion of said rupture disc to said concave-convex portion thereof;
a cylindrical shield for protecting said rup-ture disc welded to said annular flange portion of said rupture disc and to the end of said cylindrical portion of said support body; and a flat ring positioned between and welded to the end of said cylindrical portion of said support body and said annular flange portion of said rupture disc, said ring extending into said cylindrical portion of said body, interiorly of said transition connection of said rupture disc for contacting said concave-convex portion of said rupture disc at a point a distance away from said transi-tion connection of said rupture disc upon the reversal and rupture thereof so that excessive tearing of said rupture disc is prevented.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US93637178A | 1978-08-24 | 1978-08-24 | |
| US936,371 | 1978-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1127499A true CA1127499A (en) | 1982-07-13 |
Family
ID=25468537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA334,375A Expired CA1127499A (en) | 1978-08-24 | 1979-08-23 | Relief valve isolating apparatus |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS5544184A (en) |
| AU (1) | AU5021079A (en) |
| BE (1) | BE878403A (en) |
| BR (1) | BR7905396A (en) |
| CA (1) | CA1127499A (en) |
| DE (1) | DE2934001A1 (en) |
| FR (1) | FR2434323A1 (en) |
| GB (1) | GB2028426B (en) |
| IT (1) | IT1122464B (en) |
| NL (1) | NL7906371A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016174553A1 (en) * | 2015-04-28 | 2016-11-03 | Donadon Safety Discs And Decives S.R.L. | Method for making a safety or rupture element |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2941173C2 (en) * | 1979-10-11 | 1981-12-03 | Gustav F. Gerdts GmbH & Co KG, 2800 Bremen | Safety valve |
| US4549565A (en) * | 1984-03-05 | 1985-10-29 | Bs&B Safety Systems, Inc. | Reclosing rupture disk assembly |
| US4951697A (en) * | 1989-11-27 | 1990-08-28 | Bs&B Safety Systems, Inc. | Rupture disk failure indicating apparatus |
| US6431196B1 (en) | 2000-04-07 | 2002-08-13 | Bs&B Safety Systems, Inc. | Combination pressure relief device |
| US20020096210A1 (en) * | 2001-01-22 | 2002-07-25 | Paul Schwarz | Safety valve and safety valve system |
| GB0619443D0 (en) | 2006-10-02 | 2006-11-08 | Airbus Uk Ltd | A valve |
| WO2012075588A1 (en) * | 2010-12-09 | 2012-06-14 | Car-Ber Investments Inc. | Apparatus and method for testing pressure relief valves |
| CN102095006B (en) * | 2010-12-29 | 2012-07-25 | 江村 | Sealing type safety valve with bell jar valve clack of pressure bearing rod |
| EP2565504A1 (en) * | 2011-09-02 | 2013-03-06 | Aurotec GmbH | Connector of a transport pipeline |
| CN106644242A (en) * | 2016-12-30 | 2017-05-10 | 西安航天动力研究所 | Diaphragm type pressure annunciator |
| GB2559394B (en) | 2017-02-03 | 2020-04-15 | Petainer Large Container Ip Ltd | Closure with venting system |
| US10385983B2 (en) | 2017-09-27 | 2019-08-20 | Accu-Glass Products, Inc. | Burst disk assembly for high and ultra high vacuum containment vessels |
| CN113418037A (en) * | 2021-06-29 | 2021-09-21 | 西安航天动力研究所 | Diaphragm assembly and safety device for space system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE401499A (en) * | ||||
| US2098399A (en) * | 1935-12-04 | 1937-11-09 | Mathieson Alkali Works Inc | Chemical manufacture |
| US3484817A (en) * | 1967-11-07 | 1969-12-16 | Black Swalls & Bryson Inc | Safety pressure relief device |
| US3872875A (en) * | 1970-11-23 | 1975-03-25 | Jr John H Raidl | Relief valve isolating means |
| US3906977A (en) * | 1970-11-30 | 1975-09-23 | Black Sivalls & Bryson Inc | Reverse acting safety relief device |
-
1979
- 1979-07-27 GB GB7926218A patent/GB2028426B/en not_active Expired
- 1979-08-09 IT IT25038/79A patent/IT1122464B/en active
- 1979-08-17 FR FR7921312A patent/FR2434323A1/en active Granted
- 1979-08-22 DE DE19792934001 patent/DE2934001A1/en not_active Ceased
- 1979-08-22 BR BR7905396A patent/BR7905396A/en unknown
- 1979-08-23 BE BE0/196860A patent/BE878403A/en not_active IP Right Cessation
- 1979-08-23 NL NL7906371A patent/NL7906371A/en not_active Application Discontinuation
- 1979-08-23 AU AU50210/79A patent/AU5021079A/en not_active Abandoned
- 1979-08-23 CA CA334,375A patent/CA1127499A/en not_active Expired
- 1979-08-24 JP JP10803479A patent/JPS5544184A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016174553A1 (en) * | 2015-04-28 | 2016-11-03 | Donadon Safety Discs And Decives S.R.L. | Method for making a safety or rupture element |
Also Published As
| Publication number | Publication date |
|---|---|
| IT7925038A0 (en) | 1979-08-09 |
| FR2434323A1 (en) | 1980-03-21 |
| GB2028426A (en) | 1980-03-05 |
| GB2028426B (en) | 1982-10-13 |
| AU5021079A (en) | 1980-02-28 |
| FR2434323B1 (en) | 1983-03-18 |
| NL7906371A (en) | 1980-02-26 |
| BR7905396A (en) | 1980-05-20 |
| DE2934001A1 (en) | 1980-03-06 |
| IT1122464B (en) | 1986-04-23 |
| JPS5544184A (en) | 1980-03-28 |
| BE878403A (en) | 1979-12-17 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |