US20100181312A1 - Containment vessel vacuum relief assembly with tamper deterrent - Google Patents
Containment vessel vacuum relief assembly with tamper deterrent Download PDFInfo
- Publication number
- US20100181312A1 US20100181312A1 US12/355,464 US35546409A US2010181312A1 US 20100181312 A1 US20100181312 A1 US 20100181312A1 US 35546409 A US35546409 A US 35546409A US 2010181312 A1 US2010181312 A1 US 2010181312A1
- Authority
- US
- United States
- Prior art keywords
- vacuum relief
- relief assembly
- cap
- valve body
- secured
- 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.)
- Abandoned
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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
- F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
- F16K24/06—Devices, e.g. valves, for venting or aerating enclosures for aerating only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
- B65D90/34—Venting means
-
- 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
- F16K35/00—Means to prevent accidental or unauthorised actuation
- F16K35/12—Means to prevent accidental or unauthorised actuation with sealing wire
Definitions
- the vacuum relief assembly 22 includes a hollow valve body 26 formed from steel or other metal.
- Valve body includes interior wall surface 27 that defines an open interior passage 28 .
- the lowermost end of the valve body defines an outlet opening 30 surrounded by conical valve seat 31 .
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
A vacuum relief assembly for a containment vessel. The vacuum relief assembly includes a normally closed pressure activated valve assembly that selectively permits flow into the containment vessel from the atmosphere through an interior passage. The valve body includes inlet opening into the interior passage. It also includes a torque acceptance portion to permit connection of the valve assembly to a vessel. A tamper resistant cap is secured in overlying relation to the inlet opening and the torque acceptance portion. The cap is secured with mechanism that provides indicia of tampering.
Description
- The present invention is directed generally to vacuum relief assemblies for containment vessels. More particularly, it is directed to vacuum relief assemblies which deter tampering to gain unauthorized access into the vessel.
- Containment vessels may be used to store and/or carry a wide range of materials including chemicals, foodstuffs and the like. Common forms of containment vessels are railway tank cars or highway tank trucks. Such vessels are generally operated at an interior pressure that is neutral or slightly positive relative to outside atmospheric pressure. These vessels, however, are typically not well suited to withstand vacuum conditions wherein the pressure at the interior of the tank car drops significantly below exterior atmospheric pressure.
- To address the avoidance of vacuum conditions within a tank car or other containment vessel, it is generally known to utilize vacuum relief valves that open selectively to deliver air from the atmosphere into the interior of the vessel when the internal pressure drops below a predetermined level. This introduction of air is carried out by opening a normally closed flow path between the atmosphere and the vessel interior. Upon opening the flow path, air is pulled from the atmosphere into the vessel interior until the pressure differential is substantially eliminated. The flow path is thereafter closed until vacuum conditions reoccur. An example of such a vacuum relief valve is a valve available from Salco Products, Inc., Lemont, Ill.
- While such systems are quite effective, the device presents an opportunity for intentional tampering to gain unauthorized access to the vessel interior.
- A vacuum relief assembly for a containment vessel is provided. The vacuum relief assembly includes a pressure activated vacuum relief valve with a torque acceptance portion employed to affix the valve to the vessel. The valve includes a valve body defining a flow path to the interior of the valve body. The valve is adapted to be selectively opened to fluid communication from the atmosphere to the interior portion of a containment vessel. A cap is secured to the body and overlies the inlet end of the flow path to prevent access. The cap includes side walls overlying the torque acceptance portion of the valve body to prevent access. Effort to remove the cap provides visual indicia of tampering.
- The following drawings illustrate exemplary embodiments and constructions of the present invention and, together with the general description given above and the detailed description set forth below, serve to explain the principles of the invention wherein:
-
FIG. 1 illustrates an exemplary containment vessel in the form of a railroad tank car including a vacuum relief assembly; -
FIG. 2 is an exploded view of an exemplary vacuum relief assembly valve body illustrating an embodiment according to the present invention; -
FIG. 3 is a cross-sectional view of the interior of the valve body ofFIG. 2 taken generally along line 3-3 ofFIG. 2 ; and -
FIG. 4 is a sectional plan view of a vacuum relief assembly embodying principles of the present invention in assembled condition inserted within a flange plate of a containment vessel. -
FIG. 5 is a fragmentary sectional view of an alternative arrangement embodying the principles of the present invention. - Reference will now be made to the drawings wherein, to the extent possible, like reference numerals are used to designate like elements throughout the various views.
-
FIG. 1 illustrates a containment vessel in the form of an exemplaryrailroad tank car 10. As will be appreciated, thetank car 10 includes acontainment shell 12 which is typically formed from steel or other structural material defining an interior storage chamber adapted to hold a cargo which may be liquid or particulate solids. The interior storage chamber may be accessed via ahatch structure 14 which may be opened and closed by an operator. During transportation of thetank car 10, thehatch structure 14 normally remains closed and locked to prevent contamination or spillage of the cargo. - The illustrated
tank car 10 includes aflange plate 20 disposed across a surface of thecontainment shell 12. It includes a threaded opening into the interior chamber of theshell 12 adapted to accept avacuum relief assembly 22. - The
vacuum relief assembly 22 defines a flow path to allow air into the interior storage chamber in the event that vacuum conditions develop within the interior storage chamber. The path is otherwise closed when atmospheric pressure and the pressure within the chamber are balanced. - In the illustrated arrangement, the
vacuum relief assembly 22 is secured to theflange plate 20 within the threaded opening. It is, however, contemplated that thevacuum relief assembly 22 may be disposed at an opening within thecontainment shell 12 or at thehatch structure 14 or other suitable portion of thetank car 10. - One exemplary construction of the
vacuum relief assembly 22 is illustrated inFIGS. 2-4 . Thevacuum relief assembly 22 includes ahollow valve body 26 formed from steel or other metal. Valve body includesinterior wall surface 27 that defines an openinterior passage 28. The lowermost end of the valve body defines an outlet opening 30 surrounded byconical valve seat 31. - The
valve body 26 includes a lower end defining a securement portion. It includesthreads 29 adapted to engage threads in the opening within theflange plate 20. The threads are illustrated as pipe threads (NPT) a common method of attachment. It is contemplated, however, thatvalve body 26 may include a bolt flange rather than a threaded end. In that instance theflange plate 20 would include a hole, opening into the interior of theshell 12 ofvessel 10 and threaded studs arranged about the hole to receive the bolt flange of thevalve body 26. - In order to facilitate threaded engagement, the illustrated
valve body 26 includes a hexagonally shapedflange 32 to accept a wrench. It would, however, have any other commonly used torque-acceptance configuration to receive a tool to tighten or loosen thevalve body 26 relative to theflange plate 20. - As shown, a
shoulder surface 36 faces upwardly away fromflange 32. As best illustrated inFIG. 2 , generally annularupper sidewall 34 extends upwardly from theshoulder surface 36 to atop edge surface 38. - In the illustrated construction, mounting
posts 46 project upwardly from theupper edge surface 38 of theupper sidewall 34 and define the upper end of thevalve body 26. Each has atop surface 47 provided with a threadedhole 48. Themounting posts 46 are preferably integral with theupper sidewall 34 although they may be formed separately if desired. The outboard surface of themounting posts 46 is preferably generally aligned with the outer surface of the annularupper sidewall 34. The arcuateopen spaces 42 betweenposts 46 define an inlet opening 40 with access to the atmosphere surrounding thevacuum relief assembly 22. Theflow inlet opening 40 provides continuously open fluid communication path between the atmosphere andinterior passage 28 of thevalve body 26. - As best understood through reference to
FIGS. 3 and 4 , in the illustrated arrangement, thevalve body 26 includes anannular valve guide 70 defining avalve guide surface 72. It also defines aspring support shoulder 74. Valveguide 70 is supported byradial webs 75 projecting inwardly from theinterior wall 27 of thevalve body 26 that definespassage 28. Thewebs 75 are spaced around the interior of thevalve body 26 such that air can flow through the passage from the inlet opening 40 defined by the open spaces betweenmounting posts 46 throughpassage 28 and through the outlet defined byconical valve seat 31. - As illustrated in
FIG. 4 , theinterior passage 28 is normally sealed against fluid communication with the interior of thetank car 10 by amovable valve 60.Valve 60 includes ahead 61 that defines aconical seat surface 65 that seals againstconical valve seat 31 onvalve body 26 to closepassage 28 against flow. Aface surface 62 is exposed to the interior ofcontainment shell 12. -
Head 61 is connected to anelongate valve stem 64 extending axially of theinterior passage 28 and slidable withinguide surface 72. Its free end is threaded and receives anut 67 that limits the position of avalve bushing 68 disposed at an upper end of thestem 64 remote from thevalve head 61. Acompression spring member 69 is held in a compressed condition between thevalve bushing 68 and thespring support shoulder 74. As will be appreciated, such an arrangement continuously urges thevalve stem 64 andhead 61 upwardly to a sealing position withconical seat 65 sealed againstconical seat 31 ofbody 26 as shown. In this normally closed position, fluid communication through outlet opening 30 is blocked between theinterior passage 28 and the interior of thetank car 10. - In the event that the
valve 60 is subjected to a downward force due to the occurrence of a negative pressure at theface surface 62, thevalve 60 overcomes the biasing force provided by thespring member 69 and moves away from the illustrated sealing relation withseat 31 thereby establishing fluid communication between the interior of thetank car 10 and theinterior passage 28 ofvalve body 26. Since theinterior passage 28 is open to the atmosphere at communication paths defined by inlet opening 40, fluid communication is established between the interior of thetank car 10 and the atmosphere with theinterior passage 28 acting as an intermediate conduit. - Accordingly, due to a low pressure condition within the
tank car 10, air flows from the atmosphere, through theinterior passage 28 and into the interior of thetank car 10. This flow path remains open until the vacuum condition within the tank car is reduced to a level permitting thevalve 60 to return to the normally closed and sealed condition. - In the illustrated arrangement best seen in
FIGS. 2 and 4 , acap 52 is secured across the mounting posts 46. As shown, thecap 52 has a circulartop wall 53 with an interior generallyplanar surface 54. A pair ofholes 56 extend throughtop wall 53 aligned with threadedholes 48.Cap 52 has a verticalcylindrical side wall 58 having a length that exceeds the length of the mountingposts 46, theupper wall portion 34 and the hexagonally shapedflange 32.Wall 58 ofcap 52 has an inner diameter exceeding the maximum dimension of the valve body at the hexagonally shaped flange 32 (across the points of the hexagonally shaped flange 32). - In the illustrated arrangement, the
cap 52 is secured to the mountingposts 46 by fastener members in the form ofattachment bolts 59 extending throughholes 56 intop wall 53 and into threadedholes 48 intop surfaces 47 of the mounting posts 46. Thetop wall 53 of thecap 52 is held substantially parallel to theshoulder surface 36 with thecylindrical side wall 58 outwardly beyond the outer surface of the mountingposts 46 andupper wall portion 34. It extends below hexagonally shapedflange 32. Thecap 52 thus closes the upper end of the valve body, but an annular gap orspace 76 exists between the inner surface ofvertical side wall 58 and hexagonally shapedflange 32. The gap is in flow communication withinlet opening 40. - While two mounting
posts 46 and twobolts 59 are illustrated, it is contemplated that three or four mountingposts 46 could be used, equally spaced abouttop edge surface 38 of annularupper sidewall 34. Abolt 59 would connect thecap 52 to each mounting post. - A modified arrangement for attachment of
cap 52 is illustrated inFIG. 5 . The components of thevacuum relief assembly 22 of this embodiment are essentially the same as the configuration of the embodiment ofFIGS. 1-4 . However, here, aflat mounting plate 49 is attached to mountingposts 46 bybolts 59. A central vertical threadedstud 50 extends upwardly ofplate 49 and receives cap, 52 which includes a central hole rather than spacedholes 56 of the embodiment ofFIGS. 1-4 . A fastener member in the form ofnut 51 secures the cap to thestud 50. The circulartop wall 53 ofcap 52 is modified somewhat to define an annular space to accommodate the heads ofbolts 59. - In each embodiment, the vertical
cylindrical side wall 58 is formed on a diameter larger than the maximum dimension of the hexagonally shapedflange 32. There is space between thecap side wall 58 and theflange 32,upper wall portion 34 and outer surfaces of mountingposts 46. Air is free to pass between the interior surface ofside wall 58 into theinlet openings 40 betweenposts 46. - The length of side
cylindrical wall 58 prohibits access to inlet opening 40 or theinterior flow passage 28. It also prohibits manual depression ofvalve 60 against the closing force ofcompression spring member 69 to access the interior ofcontainment shell 12. This relationship protectsvacuum relief assembly 22 from damage and/or malicious tampering by unauthorized persons while nonetheless maintaining fluid communication between theinterior passage 28 and the outside atmosphere throughinlet opening 40. As shown, in the assembled condition, thesidewall 58 of thecap 68 is disposed in opposing spaced relation to thevalve body 26. In this regard, the inner diameter of thecap 68 is preferably selected to provide coverage in reasonably close proximity to the exterior of thevalve body 26 while nonetheless maintaining a sufficient space to maintain air flow across the separating space and into the valve cavity without substantial obstruction. - During the period of air flow, air is pulled from the atmosphere and into the spacing between the
valve body 26 and thesidewall 58 of thecap 52. The air then enters the valve cavity through theopen spaces 42 forminginlet opening 40. Once the pressure within the interior of the tank car has been increased to a desired level, the valve is urged back to the normal sealing condition until vacuum conditions reoccur. -
Cylindrical wall 58 ofcap 52 overlies the hexagonally shapedflange 32. This prohibits access to the torque acceptance configuration to thwart any effort to remove the entirevacuum relief assembly 22 fromflange plate 20. Thus, a person is blocked from applying a wrench or other tool to thehexagonal flange 32 and is thereby prevented from unauthorized removal of thevalve body 26 to gain access to the interior ofcontainment shell 12. - To deter tampering by removal of
cap 52,attachment bolts 59 are secured with acable seal assembly 77. The heads ofbolts 59 each include atransverse hole 78. The cable seal assembly includes abody 80 and astrand 82. One end of thestrand 82 is secured to thebody 80. The free end of thestrand 82 is passed through thetransverse holes 78 and then secured within thebody 80. The bolts cannot be removed without destroying the cable seal thus providing indicia of intentional tampering. Thecable seal body 80 is usually provided with a code recordable at the time of insertion to preclude substitution of a different cable seal assembly. - In the embodiment of
FIG. 5 , the free end ofstrand 82 is passed through a transverse hole innut 51 and a transverse hole instud 50 and secured intobody 80. Sincestud 50 is centrally disposed, thecap 52 is free to rotate relative to the remainder of theassembly 22 as a further deterrent to unauthorized removal. - Upon observing a broken or missing cable, the authorized user will thus be alerted to the possibility that the contents of the containment vessel may have been subjected to tampering and proper remedial measures may be taken.
- Importantly, it is to be understood that the illustrated and described operational features of the valve assembly are exemplary only, and any number of other operating configurations may be utilized if desired. Accordingly, it is to be understood that the use of any and all examples, or exemplary language provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.
- No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention. Preferred embodiments of this invention are described herein, including the best mode known to the inventors for carrying out the invention. Variations of those preferred embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein.
Claims (29)
1. A vacuum relief assembly for a containment vessel comprising:
a valve body having an interior wall defining a passage including an inlet opening and an outlet opening, said outlet opening being adapted for fluid communication with a containment portion of a containment vessel and said inlet opening being open to atmosphere, a normally closed valve, closing said passage and operable to selectively open said passage between said inlet opening and said outlet opening,
a cap mounted on said valve body, said cap overlying said inlet opening in spaced relation to said valve body, said cap configured to prohibit access to said passage through said inlet opening.
2. A vacuum relief assembly as claimed in claim 1 , wherein said valve body is generally cylindrical and includes a securement end portion configured to be secured to a containment vessel and wherein said cap and said valve body define a space between said valve body and said cap providing a flow path between said inlet opening and an outside atmosphere.
3. A vacuum relief assembly as claimed in claim 2 , wherein said valve body includes a generally cylindrical upper sidewall having an upper edge surface portion and at least one mounting post projecting upwardly from said upper edge surface of said sidewall portion, arcuate spaces defined by said upper edge surface and said at least one mounting post defining said inlet opening.
4. A vacuum relief assembly as claimed in claim 3 , wherein said cap is secured to said at least one mounting post.
5. A vacuum relief assembly as claimed in claim 4 wherein said valve body includes a plurality of mounting posts projecting upward from said upper edge surface of said sidewall portion, said arcuate spaces defined by said upper edge surface and said mounting posts, and wherein said cap includes a top wall defining an interior surface supported on said mounting posts and a generally cylindrical side wall surrounding said inlet opening and said generally cylindrical upper wall portion in spaced relation thereto.
6. A vacuum relief assembly as claimed in claim 3 , wherein said valve body includes a torque acceptance configuration and said cap surrounds said torque-acceptance configuration prohibiting access thereto.
7. A vacuum relief assembly as claimed in claim 4 wherein said valve body includes a torque-acceptance configuration and said cap surrounds said torque-acceptance configuration prohibiting access thereto.
8. A vacuum relief assembly as claimed in claim 5 wherein said valve body includes a torque-acceptance configuration and said cap surrounds said torque-acceptance configuration prohibiting access thereto.
9. A vacuum relief assembly as claimed in claim 6 , wherein said valve body includes a shoulder surface extending radially outwardly from said valve body above said torque acceptance configuration and said generally cylindrical upper wall portion of said valve body extends upwardly from said shoulder surface.
10. A vacuum relief assembly as claimed in claim 8 , wherein said valve body includes a shoulder surface extending radially outwardly from said valve body above said torque acceptance configuration and said generally cylindrical upper wall portion of said valve body extends upwardly from said shoulder surface.
11. A vacuum relief assembly as claimed in claim 6 wherein said torque-acceptance configuration is a hexagonally shaped flange.
12. A vacuum relief assembly as claimed in claim 7 wherein said torque-acceptance configuration is a hexagonally shaped flange.
13. A vacuum relief assembly as claimed in claim 8 wherein said torque-acceptance configuration is a hexagonally shaped flange.
14. A vacuum relief assembly as claimed in claim 9 wherein said torque-acceptance configuration is a hexagonally shaped flange.
15. A vacuum relief assembly as claimed in claim 10 wherein said torque-acceptance configuration is a hexagonally shaped flange.
16. A vacuum relief assembly as claimed in claim 4 wherein said cap is secured to said at least one mounting post by at least one fastener member.
17. A vacuum relief assembly as claimed in claim 7 wherein said cap is secured to said at least one mounting post by at least one fastener member.
18. A vacuum relief assembly as claimed in claim 9 wherein said cap is secured to said at least one mounting post by at least one fastener member.
19. A vacuum relief assembly as claimed in claim 5 wherein said cap is secured to each said mounting post by a fastener member.
20. A vacuum relief assembly as claimed in claim 8 wherein said cap is secured to each said mounting post by a fastener member.
21. A vacuum relief assembly as claimed in claim 10 wherein said cap is secured to each said mounting post by a fastener member.
22. A vacuum relief assembly as claimed in claim 13 wherein said cap is secured to each said mounting post by a fastener member.
23. A vacuum relief assembly as claimed in claim 16 wherein said at least one fastener member is secured by a cable seal assembly.
24. A vacuum relief assembly as claimed in claim 17 wherein said at least one fastener member is secured by a cable seal assembly.
25. A vacuum relief assembly as claimed in claim 18 wherein said at least one fastener member is secured by a cable seal assembly.
26. A vacuum relief assembly as claimed in claim 19 wherein said fastener members are secured by a cable seal assembly.
27. A vacuum relief assembly as claimed in claim 20 wherein said fastener members are secured by a cable seal assembly.
28. A vacuum relief assembly as claimed in claim 21 wherein said fastener members are secured by a cable seal assembly.
29. A vacuum relief assembly as claimed in claim 22 wherein said fastener members are secured by a cable seal assembly.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/355,464 US20100181312A1 (en) | 2009-01-16 | 2009-01-16 | Containment vessel vacuum relief assembly with tamper deterrent |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/355,464 US20100181312A1 (en) | 2009-01-16 | 2009-01-16 | Containment vessel vacuum relief assembly with tamper deterrent |
Publications (1)
Publication Number | Publication Date |
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US20100181312A1 true US20100181312A1 (en) | 2010-07-22 |
Family
ID=42336121
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/355,464 Abandoned US20100181312A1 (en) | 2009-01-16 | 2009-01-16 | Containment vessel vacuum relief assembly with tamper deterrent |
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US (1) | US20100181312A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100147014A1 (en) * | 2007-09-01 | 2010-06-17 | Kim Yong-Keun | Freezing crack or distortion proof cooling utensil |
CN101915333A (en) * | 2010-07-29 | 2010-12-15 | 陈岳荣 | Anti-theft device for storage tank valve |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1451136A (en) * | 1921-08-10 | 1923-04-10 | Benjamin F Allnutt | Filling tube for liquid receptacles |
US1819827A (en) * | 1929-06-24 | 1931-08-18 | Heil Co | Sanitary vent for pressure milk tanks |
US2619316A (en) * | 1947-02-04 | 1952-11-25 | Ronald M Wilson | Check valve |
US4335743A (en) * | 1980-03-27 | 1982-06-22 | Leon Jones | Milking machine system, and pressure regulator incorporated therein |
US5904178A (en) * | 1997-06-20 | 1999-05-18 | Controls Corporation Of America | Gas filter for regulator valve, and improved regulator valve employing the filter |
US5918619A (en) * | 1996-12-17 | 1999-07-06 | Woods; Ronald | Safety pressure relief valve assembly, components therefor and methods of making the same |
US6668853B2 (en) * | 2001-05-10 | 2003-12-30 | Delaware Capital Formation, Inc. | Pressure relief valve with field-replaceable high corrosion-resistant components |
US7383855B2 (en) * | 2005-12-12 | 2008-06-10 | Cashco, Inc. | Sanitary tank vent valve |
-
2009
- 2009-01-16 US US12/355,464 patent/US20100181312A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1451136A (en) * | 1921-08-10 | 1923-04-10 | Benjamin F Allnutt | Filling tube for liquid receptacles |
US1819827A (en) * | 1929-06-24 | 1931-08-18 | Heil Co | Sanitary vent for pressure milk tanks |
US2619316A (en) * | 1947-02-04 | 1952-11-25 | Ronald M Wilson | Check valve |
US4335743A (en) * | 1980-03-27 | 1982-06-22 | Leon Jones | Milking machine system, and pressure regulator incorporated therein |
US5918619A (en) * | 1996-12-17 | 1999-07-06 | Woods; Ronald | Safety pressure relief valve assembly, components therefor and methods of making the same |
US5904178A (en) * | 1997-06-20 | 1999-05-18 | Controls Corporation Of America | Gas filter for regulator valve, and improved regulator valve employing the filter |
US6668853B2 (en) * | 2001-05-10 | 2003-12-30 | Delaware Capital Formation, Inc. | Pressure relief valve with field-replaceable high corrosion-resistant components |
US7383855B2 (en) * | 2005-12-12 | 2008-06-10 | Cashco, Inc. | Sanitary tank vent valve |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100147014A1 (en) * | 2007-09-01 | 2010-06-17 | Kim Yong-Keun | Freezing crack or distortion proof cooling utensil |
CN101915333A (en) * | 2010-07-29 | 2010-12-15 | 陈岳荣 | Anti-theft device for storage tank valve |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SALCO PRODUCTS, INC., ILLINOIS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DEGUTIS, ALEX V.;GUBRICKY, PETER J.;BOROWSKI, WILLIAM R.;AND OTHERS;SIGNING DATES FROM 20090113 TO 20090116;REEL/FRAME:022132/0346 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |