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WO1991000465A1 - Joint d'etancheite a soufflets pour vannes et analogues - Google Patents

Joint d'etancheite a soufflets pour vannes et analogues Download PDF

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Publication number
WO1991000465A1
WO1991000465A1 PCT/US1989/005816 US8905816W WO9100465A1 WO 1991000465 A1 WO1991000465 A1 WO 1991000465A1 US 8905816 W US8905816 W US 8905816W WO 9100465 A1 WO9100465 A1 WO 9100465A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
actuator
bellows seal
seal
shaft
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.)
Ceased
Application number
PCT/US1989/005816
Other languages
English (en)
Inventor
Edwin D. Phillips
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO1991000465A1 publication Critical patent/WO1991000465A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F16K41/00—Spindle sealings
    • F16K41/10—Spindle sealings with diaphragm, e.g. shaped as bellows or tube
    • F16K41/103—Spindle sealings with diaphragm, e.g. shaped as bellows or tube the diaphragm and the closure member being integrated in one member

Definitions

  • This invention relates to seals, and more particularly, to a bellows seal for use in valves, pipe connections and the like.
  • Seals for sealing against fluid loss in valves and pipelines currently include various designs embodying one or a combination of o-rings, gaskets, diaphragms, bellows and the like.
  • the use of o-rings and gaskets is probably most common, but in some installations involving corrosive materials such seals may not be suitable because of their exposure to the corrosive environment and the resultant need to make the seals of an expensive material capable of resisting the corrosive environment.
  • the tolerances of mating or adjacent components must be kept within carefully controlled limits.
  • Bellows type seals are sometimes used in situations where an o-ring seal would not be satisfactory. Such bellows seals are generally relatively expensive, how ⁇ ever, requiring particular manufacturing processes such as molding, etc. to form the bellows. In some appli ⁇ cations, a bellows is manufactured by molding, etc. and steel reinforcing rings are then placed around the bellows to give it radial strength to resist internal pressures. Further, in the manufacture of various glass shut off and metering valves used in the chemical industry, there is a major problem of increasing costs in materials and the highly skilled labor needed to make such apparatus. For instance, glass valve bodies used in such apparatus frequently require side-opening passages.
  • valves which use o- rings to form a seal between the inner surface of the glass valve body and the outer surface of the actuator or valve member
  • the glass tubing used in forming the valve body must be precision bore tubing
  • the side- opening passage must be precisely located
  • the distortion of the inner glass wall must be kept to a minimum to stay within the tolerance limits of the o- ring seal, requiring a high degree of skill by the glass worker.
  • Valves are usually made longer than necessary in order to minimize these problems, although without much success.
  • an object of this invention is to provide a seal which eliminates the need for an o-ring, thereby avoiding the problems associated with the use of an o-ring as discussed above, including the need for use of precision bore tubing, the need to precisely locate side-openings and the need to control distortion.
  • Another object of the invention is to provide a bellows seal for use in glass valves as used in the chemical industry, for example, thereby eliminating the need for o-ring seals.
  • a further object is to provide a unique method of making a bellows seal, in which the bellows is machined from a solid piece of stock material and subsequently shaped with a pleated configuration.
  • Yet another object of the invention is to provide a bellows seal for a valve actuator, in which the seal has a first end portion with a left-hand thread therein and a second end portion with a right-hand thread, for cooperation with an actuator stem having spaced apart, oppositely threaded portions thereon, so that the linear pitches of the two threaded portions are additive during operation of the valve to double the rate of movement of the valve upon turning of the actuator.
  • a still further object of the invention is to provide a bellows seal for a valve actuator, which, by a simple modification, enables the valve to be actuated by a screw-threaded shaft, a positive pressure piston or a vacuum responsive piston, depending upon the selection and arrangement of actuator components.
  • Fig. 1 is a longitudinal sectional view of a glass- bodied valve incorporating therein a first form of the bellows seal of the invention
  • Fig. 2 is an enlarged, fragmentary, longitudinal sectional view of the bellows seal used in the invention shown in figure 1;
  • Fig. 3 is a transverse sectional view of the bellows seal and actuator of the invention, and is taken along line 3-3 in figure 2;
  • Fig. 4 is an enlarged, longitudinal sectional view of a '" first modification of the invention, in which a normally closed valve is modified to be actuated by application of a vacuum to the actuator;
  • Fig. 5 is an enlarged, longitudinal sectional view of a second modification of the invention, in which a normally open valve is modified to be actuated by application of a positive pressure to the actuator;
  • Fig. 6 is a perspective view of a piece of solid stock material used to make the bellows seal of the invention
  • Fig. 7 is a schematic view illustrating a first step in manufacturing the bellows seal in accordance with the invention, i.e., drilling out the center of the solid piece of stock material;
  • Fig. 8 is a side view of the bellows seal of the invention, showing parts in section and parts in elevation, after a second step in the manufacturing process, i.e. machining to form a tubular body with annular reinforcing rings thereon and body portions at opposite ends;
  • Fig. 9 is a partial longitudinal sectional side view of the bellows seal of figure 8 after a second manufacturing step, i.e. axial displacement of one end of the tubular body to form the bellows or accordion ⁇ like pleated configuration;
  • Fig. 10 is a schematic view in partial longitudinal section showing the manner in which the threaded actuator may be attached to the bellows seal.
  • a first form of the bellows seal according to the invention is indicated generally at 10 in figures 1 through 3, and comprises a glass valve body 11 having an inlet port 12 and side-opening outlet port 13.
  • a valve seat 14 is formed in the body between the inlet and outlet ports, and an extension 15 is formed on the body adjacent the outlet port for attachment of a valve actuator.
  • a valve member 16 is mounted in the body 11 for reciprocating movement toward and away from the seat 14, and in the specific example shown has a tapered nose 17 with an annular recess 18 and an o-ring seating member 19 fitted in the recess 17 for cooperation with the seat 14.
  • the seating member could be formed integrally with the tapered nose.
  • the valve member 16 is caused to reciprocate by a threaded actuator shaft 20 extending through the glass body 11 and projecting beyond the extension 15, where a suitable hand grip 21 is provided on the end of the actuator shaft.
  • An actuator seal 22 extends coaxially around the actuator shaft, and comprises an elongate, tubular, bellows-like body 23 with a first internally threaded end portion 24 secured relative to the valve body 11, and a second internally threaded end portion 25, on which the valve member 16 is formed.
  • the actuator shaft 20 has a pair of axially spaced apart, externally threaded portions 26 and 27 thereon threadably engaged with the internally threaded portions 24 and 25, respectively, whereby when the actuator shaft is turned, the interengaged screw threaded portions on the seal and shaft cause the valve member 16 to move toward and away from the valve seat, depending upon the direction of' rotation of the shaft.
  • the bellows 23 seals the actuator shaft from the fluid being controlled by the valve.
  • the interengaged screw threaded portions 24,26 and 25,27 may be oppositely threaded.
  • the screw threads 24 and 26 may be left-hand threads while the screw threads 25 and 27 may be right-hand threads, for a right-hand opening valve, for example, although these directions could be reversed.
  • the linear pitches of the two interengaged threaded portions are additive during actuation of the valve, effectively doubling the rate of movement of the valve member 16 for a given rotational movement of the actuator.
  • a valve body sealing means 28 for sealing the bellows and actuator assembly to the valve body comprises a gripping saddle and o-ring assembly, as described in my earlier patent number 4,669,763, for example.
  • the seal 26 may comprise a separate gripping saddle with an o-ring held therein as shown in my earlier patent, or an annular channel 29 may be formed in the outer surface of the internally threaded end portion 24 and the o-ring 30 received in the channel, as shown in figure 2.
  • the bellows seal 23 is formed with a plurality of axially spaced apart annular reinforcing rings 31 thereon to increase the ability of the bellows to with- stand internal pressures.
  • the bellows seal 23 is unique, and the method of making it is unique, as schematically illustrated in figures 6-10.
  • a solid piece of cylindrical bar stock "B" of suitable material is selected and an axial bore 32 formed therethrough by drilling or the like.
  • the tubular piece resulting from this operation is then machined on a suitable apparatus such as a screw machine or the like (not shown) to form a cylindrical body 23A with opposite end portions 24 and 25, the valving member 16, and annular reinforcing rings 31, as shown in figure 8.
  • the body 23A is then collapsed axially to form the bellows-like configuration as shown in figure 9.
  • the bellows seal 23 is preferably made from a high molecular weight material having memory so that it will return to its at-rest configuration after being collapsed or stretched and having adequate strength so as not to crack or tear after it is flexed several thousand times during use.
  • a high molecular Teflon has been found suitable, although other materials such as stainless steel, copper, brass, steel, or other alloys may be used, depending upon the environment in which the valve is to be used.
  • the material must have sufficient density that the fluid being controlled will not diffuse or penetrate through the thin wall of the bellows.
  • An example of one suitable material is known as "Hi T Rod", catalogue number 800, by Chemglass.
  • the bellows seal has a minimum inside diameter of about 10mm, a wall thickness of about .25mm, a maximum outer diameter of about 12- 13mm, and the reinforcing rings have a radial dimension of about 1.5mm.
  • the bellows seal has been described as using the saddle and o-ring sealing assembly for sealing the bellows seal and actuator relative to the valve body, in a non-corrosive environment, an ordinary rubber faced type gasket can be used for this purpose.
  • a first modification of the invention is shown at 40 in figure 4.
  • a cylinder 41 is attached to the extension 15 on the housing or valve body and the actuator shaft 20 is replaced with a much longer shaft 42 having a piston 43 on the outer end thereof and reciprocable in the cylinder.
  • a slightly modified bellows seal 23A is used in this form of the invention, in that the fixed end 24A of the bellows seal is not internally threaded and the shaft 42 simply extends therethrough with radial clearance. Additionally, the inner end 44 of the shaft is in fixed threaded engagement with the end 25A of the bellows seal, whereby reciprocating movement of the shaft results in reciprocating movement of the end 25A and associated valving member 16.
  • the bellows seal 23 could be identical to that described in relation to figures 1-3, in which case the inner end 44 of the shaft 42 would be threadably engaged with the internally threaded end portion 25 of the bellows seal. In this case, the threads in the end portion 24 would not have any function, and the shaft 42 would simply extend, with radial clearance, through the end 24.
  • the cylinder 41 is attached to the valve body by means of an adaptor sleeve 45 having a radially outwardly directed flange 46 and internal threads 47.
  • the flange has a slightly downwardly and outwardly tapered end surface for enhancing the clamping effect on the saddle and o-ring seal assembly, and is held to the valve body in clamped relationship against the saddle and o-ring assembly by threaded collar 48 engaged on the extension 15.
  • the cylinder 41 has an externally thread ⁇ ed attaching nipple 49 on the end thereof, engaged in the threaded adaptor sleeve to hold the cylinder to the valve body, and the shaft 42 is sealed relative to the cylinder by means of an o-ring engaged between the shaft and the inside bore of the nipple 49.
  • a fitting 50 is engaged on the outer end of the cylinder for attachment to a source of vacuum, and a spring 51 is engaged between the fitting and the piston 43 to normally urge the piston, valve shaft and valving member to the right into closing engagement on the valve seat.
  • a flat is formed axially through the threads on the nipple 49 to vent air from inside the bellows 23.
  • a second modification of the invention is indicated generally at 60 in figure 5.
  • a spring 61 is engaged between the piston 43 and the inner end of the cylinder 62 for urging the piston, shaft and valve member to the left to a normally open position.
  • this relationship could be reversed as shown in figure 4, whereby the valve is normally closed.
  • a fitting 63 is connected to the cylinder to admit air or other fluid under pressure to the outer end of the piston to urge it to the right to close the valve. It should be noted that if the spring is positioned to normally close the valve, then the air passage would be positioned to admit air to the other side of the piston to open the valve. In all other respects, this form of the invention is the same as that shown in figure 4.
  • the forms of the invention shown in figures 4 and 5 both enable remote, programmed operation of the valve. These forms of the invention are very reliable in operation and may be desired, for example, when hazardous materials (explosive, radioactive, poisonous, etc.) are being controlled by the valve.
  • the bellows itself has uses other than as a valve actuator seal as described above.
  • the bellows could be used to join two out-of-line pipes, or to make a right angle connection, etc. It is not limited to a valve as particularly shown and described herein.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Valves (AREA)

Abstract

Un joint d'étanchéité unique à soufflets (22) destiné à assurer l'étanchéité de composants de vannes, à raccorder des sections de conduits ensemble, et analogues, comprend un corps allongé plissé en accordéon (23) doté d'une première et d'une seconde extrémités sur lesquelles se trouvent une pluralité d'anneaux de renforcement (31) espacés axialement. Ledit joint d'étanchéité (22) est usiné à partir d'une pièce de matière solide afin de produire une section allongée tubulaire à doubles parois, sur la surface extérieure de laquelle se trouvent lesdits anneaux de renforcement (31), et est ensuite comprimé axialement afin de former les plis en accordéon. Selon un mode de réalisation de l'invention, ledit joint d'étanchéité (22) s'étend coaxialement autour de l'arbre actuateur (20) d'une vanne, afin d'assurer l'étanchéité dudit arbre actuateur (20) par rapport au corps de la vanne. Des parties filetées (24, 25, 26, 27) se trouvant sur les extrémités opposées dudit joint d'étanchéité, et sur des parties espacées dudit arbre actuateur (20), s'engagent mutuellement les unes dans les autres afin de provoquer le mouvement de va-et-vient d'un élément de vanne (16), lorsque ledit arbre est mis en rotation. Le pas desdites parties filetées peut être inversé l'un par rapport à l'autre, afin de doubler la vitesse du mouvement dudit élément de vanne (16), lors d'une rotation donnée dudit arbre (20). Selon un autre mode de réalisation de l'invention, on peut prévoir un piston (43) réagissant à la pression sur ledit arbre actuateur (42), et non sur lesdites parties filetées, afin de provoquer le mouvement dudit arbre (42) et dudit élément de vanne (16) ainsi portés.
PCT/US1989/005816 1989-06-23 1989-12-26 Joint d'etancheite a soufflets pour vannes et analogues Ceased WO1991000465A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US37082989A 1989-06-23 1989-06-23
US370,829 1989-06-23

Publications (1)

Publication Number Publication Date
WO1991000465A1 true WO1991000465A1 (fr) 1991-01-10

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Application Number Title Priority Date Filing Date
PCT/US1989/005816 Ceased WO1991000465A1 (fr) 1989-06-23 1989-12-26 Joint d'etancheite a soufflets pour vannes et analogues

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WO (1) WO1991000465A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19717414A1 (de) * 1997-04-25 1998-06-04 Herion Werke Gmbh & Co Kg Mehrwegeventil
WO2013056730A1 (fr) 2011-10-18 2013-04-25 In2Care B.V. Usage systémique chez des humains de composés qui détruisent les ectoparasites externes qui se nourrissent de sang
US10690259B2 (en) 2012-10-17 2020-06-23 Swagelok Company Manually actuated valve with over-travel feature
CN114165671A (zh) * 2021-10-18 2022-03-11 上海贤日测控科技有限公司 浮动充注密封机构

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1527154A (en) * 1920-03-23 1925-02-17 American Radiator Co Packless valve
US2153213A (en) * 1935-07-31 1939-04-04 Diamond Power Speciality Apparatus for determining liquid levels
US2431297A (en) * 1943-07-17 1947-11-18 Moore Products Co Pneumatic control apparatus
US3326512A (en) * 1964-10-01 1967-06-20 Gen Electric Metal valve
US3550903A (en) * 1967-06-27 1970-12-29 Huntington Mechanical Lab Valve and valve closure mechanism
DE2257096A1 (de) * 1972-01-07 1973-07-19 Atomic Energy Of Canada Ltd Ventilanordnung
US4688601A (en) * 1984-08-20 1987-08-25 Astill Cyril J Control valve

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1527154A (en) * 1920-03-23 1925-02-17 American Radiator Co Packless valve
US2153213A (en) * 1935-07-31 1939-04-04 Diamond Power Speciality Apparatus for determining liquid levels
US2431297A (en) * 1943-07-17 1947-11-18 Moore Products Co Pneumatic control apparatus
US3326512A (en) * 1964-10-01 1967-06-20 Gen Electric Metal valve
US3550903A (en) * 1967-06-27 1970-12-29 Huntington Mechanical Lab Valve and valve closure mechanism
DE2257096A1 (de) * 1972-01-07 1973-07-19 Atomic Energy Of Canada Ltd Ventilanordnung
US4688601A (en) * 1984-08-20 1987-08-25 Astill Cyril J Control valve

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19717414A1 (de) * 1997-04-25 1998-06-04 Herion Werke Gmbh & Co Kg Mehrwegeventil
WO2013056730A1 (fr) 2011-10-18 2013-04-25 In2Care B.V. Usage systémique chez des humains de composés qui détruisent les ectoparasites externes qui se nourrissent de sang
US10690259B2 (en) 2012-10-17 2020-06-23 Swagelok Company Manually actuated valve with over-travel feature
CN114165671A (zh) * 2021-10-18 2022-03-11 上海贤日测控科技有限公司 浮动充注密封机构
CN114165671B (zh) * 2021-10-18 2024-05-03 上海贤日测控科技有限公司 浮动充注密封机构

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