DK155687B - VALVE WITH AN annular, movable valve body - Google Patents
VALVE WITH AN annular, movable valve body Download PDFInfo
- Publication number
- DK155687B DK155687B DK241280AA DK241280A DK155687B DK 155687 B DK155687 B DK 155687B DK 241280A A DK241280A A DK 241280AA DK 241280 A DK241280 A DK 241280A DK 155687 B DK155687 B DK 155687B
- Authority
- DK
- Denmark
- Prior art keywords
- valve
- disc
- annular
- wall
- pressure
- Prior art date
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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
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/08—Ventilation of sewers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Self-Closing Valves And Venting Or Aerating Valves (AREA)
- Safety Valves (AREA)
- Check Valves (AREA)
- Pens And Brushes (AREA)
- Taps Or Cocks (AREA)
Description
iin
DK 155687 BDK 155687 B
Opfindelsen angår en ventil af den i krav l's indledning angivne art. For at fungere godt skal afløbsystemer være forsynet med en luftåbning, eftersom afløbsvandet løber i ufyldte ledninger og derved river luft med sig. Uden ind-5 føring af luft ville undertrykket blive så stort, at vandlåsen kunne blive suget ud, hvorefter afløbsgassen ville have fri adgang til omgivende rum. Luftindslippet tilvejebringes sædvanligvis med en udluftningsledning, som afsluttes over bygningens tag. Herved opstår imidlertid om 10 vinteren den ulempe, at vanddamp, der strømmer ud af udluftningsledningen, kondenserer og danner is eller rimfrost ved mundingen, så at luftindføring undertiden forhindres.The invention relates to a valve of the kind specified in the preamble of claim 1. In order to function well, drainage systems must be provided with an air opening, since the drainage water runs in unfilled conduits and thereby tears air with it. Without the introduction of air, the vacuum would become so large that the water trap could be sucked out, after which the exhaust gas would have free access to surrounding space. The air inlet is usually provided with a vent line which terminates over the roof of the building. However, in the winter, this causes the disadvantage that water vapor flowing out of the vent line condenses and forms ice or frost at the mouth, sometimes preventing air entry.
Dette kan forhindres ved, at udluftningsledningen afsluttes med en automatisk ventil inde i bygningen, hvilket forud-15 sætter, at ventilen udføres med en betryggende funktions-sikkerhed. Ved at ledningen afsluttes inde i huset, opnås ydermere store omkostningsbesparelser p.g.a. enklere ledningsføring og bygningsarbejde, samtidig med at risikoen for taglækage elimineres.This can be prevented by closing the vent line with an automatic valve inside the building, which presupposes that the valve is executed with a satisfactory functional safety. By ending the cord inside the house, further great cost savings are achieved because simplified wiring and construction work, while eliminating the risk of roof leaks.
20 Udluftningsventilen skal normalt være helt lukket og først åbne, når undertrykket når op på ca. 5 mm vs. Den skal have stor kapacitet allerede ved lave undertryk for at være egnet til afløbssystemer, hvor en vandlås med 50 mm lukkedybde skal sikres. Den luftmængde, der transporteres ved spuling, 25 kan være op til 30 gange større end spulevæskemængden, og i betragtning af, at trykforskellen ikke må overstige 50 mm vs, er det åbenbart, at udluftningsventilen ikke må medføre nogen indsnævring af arealet.20 The vent valve must normally be fully closed and open only when the vacuum reaches approx. 5 mm vs. It must have high capacity already at low underpressures to be suitable for drainage systems where a water trap with 50 mm closing depth must be secured. The amount of air transported by flushing can be up to 30 times greater than the amount of flushing fluid, and given that the pressure difference must not exceed 50 mm vs, it is evident that the vent valve must not cause any narrowing of the area.
Et lignende problem kan opstå i en vandledning, hvor foru-30 renet vand, f.eks. fra et toilet eller en opvaskemaskine, ved et reduceret tryk i hovedledningen kan blive suget tilbage i hovedledningen. For at hindre en sådan tilbagesugning monteres i reglen såkaldte vakuumventiler i tilslutning til toilettet eller opvaskemaskinen.A similar problem may arise in a water line where contaminated water, e.g. from a toilet or dishwasher, at a reduced pressure in the mains can be sucked back into the mains. In order to prevent such a vacuum, so-called vacuum valves are usually fitted in connection with the toilet or dishwasher.
22
DK 155687 BDK 155687 B
En kendt udluftningsventil af den omhandlede art er vist i svensk patentskrift nr. 325 237. Det bevægelige ventillegeme udgøres her af en bøjelig, ringformet membran, hvis yderkant . er tætnende fastgjort på ventilens låg, og hvis inderkantparti 5 normalt ligger an mod den fortrinsvis ægformede overkant af en ventilationsmunding, og membranen ligger normalt an mod ventilationsmundingen under indflydelse af tyngdekraften.A known vent valve of the kind in question is shown in Swedish Patent Specification No. 325 237. The movable valve body here is constituted by a flexible, annular membrane, the outer edge of which is provided. are sealingly secured to the valve cover and the inner edge portion 5 of which normally abuts the preferably ovoid upper edge of a vent orifice and the diaphragm normally abuts the vent orifice under the influence of gravity.
For rigtig ventilfunktion er det vigtigt, at membranen er velcentreret og -indpasset, hvilket er svært at opnå, bl.a.For proper valve function, it is important that the diaphragm is well centered and fitted, which is difficult to achieve.
10 fordi membranen efter montering af ventilen er utilgængelig for inspektion. En yderligere ulempe består i, at åbnings-arealet mellem membranen og ventilationsmundingen er meget begrænset trods ventilens store radiale dimensioner.10 because the membrane after mounting the valve is inaccessible for inspection. A further disadvantage is that the opening area between the diaphragm and the vent is very limited despite the large radial dimensions of the valve.
Andre kendte udluftningsventiler har en fjederbelastet 15 ventilskive eller ventilklap, som er drejeligt lejret og normalt holdes presset mod et ventilsæde. Et tætnende anlæg søges tilvejebragt ved, at ventilskiven er forsynet med en pakning af elastisk materiale. Det kan imidlertid let ske, at ventilskiven med tiden bliver skæv eller får en hældende 20 stilling, så at pakningen ikke formår at tætne mod ventilsædet under indvirkning af den nødvendigvis svage fjederkraft.Other known vent valves have a spring-loaded valve washer or valve flap which is pivotally mounted and normally held pressed against a valve seat. A sealing system is sought to be provided by the valve disc being provided with a gasket of resilient material. However, it can easily happen that the valve disc becomes skewed over time or gets a sloping position so that the gasket is unable to seal against the valve seat under the effect of the necessarily weak spring force.
En anden kendt konstruktion er udformet til at overvinde ulemperne ved de ovennævnte konstruktioner og har som eneste bevægelige del en ringformet ventilskive i et i det 25 væsentlige cirkulærcylindrisk ventilhus med en ringformet indløbsåbning. Ventilskivens spillerum i radial retning skal være ret lille, når den befinder sig i tætnende stilling.Another known construction is designed to overcome the disadvantages of the above-mentioned structures and has as its only movable part an annular valve disc in a substantially circular cylindrical valve housing with an annular inlet opening. The clearance of the valve disc in the radial direction should be quite small when in the sealing position.
I modsat fald kan ventilskiven ikke dække indløbsåbningen, hvis ventilskiven skulle ende i en stilling, hvor den et 30 sted på omkredsen ligger an mod ventilhusets indervæg.Otherwise, the valve washer cannot cover the inlet opening if the valve was to end in a position where it abuts a position on the inner wall of the valve housing.
Endvidere skal indervæggens diameter aftage i opadgående retning fra ventilsædet, for at ventilskiven ved skråstilling ikke skal blive stående i en skrå stilling hældende mod ventilhusets indervæg. Dette indebærer,at ventilskivens nederste, 35 ydre kant ved skråstilling af ventilskiven kan komme i klemme 3Furthermore, the diameter of the inner wall must decrease in an upward direction from the valve seat, so that the valve disc, when inclined, does not remain in an inclined position inclined towards the inner wall of the valve housing. This means that the lower, 35 outer edge of the valve disc, when sloping the valve disc, can be clamped 3
DK 155687 BDK 155687 B
mod den indad hældende indervæg, så at ventilskiven bliver stående i åben stilling. Når der skal opnås en nogenlunde stor løftehøjde, bliver indervæggens diameter ved vent il -husets loft ydermere nogenlunde den samme som ventilskivens 5 udvendige diameter, hvorved der opstår en yderligere risiko for, at ventilskiven sætter sig fast i åben stilling, frem for alt fordi den ringformede ventilskive let kan få den ubetydelige urundhed, som gør, at ventilskiven let kommer i klemme og sætter sig fast. Dette er især tilfældet, hvis 10 udluftningsventilen har været opbevaret liggende på siden i et stykke tid, inden den tages i brug, i hvilket tilfælde en elastisk tætningsring let bibringes en permanent deformation i form af en urundhed eller skævhed.against the inwardly inclined inner wall so that the valve disc remains in the open position. Furthermore, when a relatively high lifting height is to be obtained, the diameter of the inner wall at the vent in the ceiling of the housing is more or less the same as the outside diameter of the valve disc 5, thereby creating an additional risk of the valve disc becoming stuck in the open position, mainly because it annular valve disc can easily get the insignificant roundness which causes the valve disc to easily get caught and get stuck. This is especially the case if the vent valve has been stored lying on the side for a while before being used, in which case an elastic sealing ring is easily imparted to a permanent deformation in the form of a roundness or skew.
Formålet med opfindelsen er at angive en ventil af den om-15 handlede art, som er enklere end de kendte ventiler, men trods dette er mere funktionssikker, og som bl.a. selv ved isdannelse i et område på ventilskiven fungerer tilfredsstillende. Dette formål opnås ved, at ventilen er udformet som angivet i krav l's kendetegnende del.The object of the invention is to provide a valve of the type which is simpler than the known valves, but in spite of this being more functional and safe. even when icing in an area of the valve disc works satisfactorily. This object is achieved by the valve being designed as defined in the characterizing part of claim 1.
20 Det aksialt rettede styr forhindrer trykskiven i at sætte sig fast på ventilhusets indervæg. Hvis ventilen opbevares liggende på siden, holdes den elastiske ventilskive i det væsentlige i en plan stilling af trykskiven, som af det aksiale styreorgan altid holdes i en stilling med trykskiven 25 parallel med ventilsædets plan.20 The axially directed guide prevents the pressure washer from sticking to the inner wall of the valve body. If the valve is kept lying on the side, the resilient valve disc is substantially held in a flat position by the pressure washer, which is always held by the axial control means in a position with the pressure disk 25 parallel to the plane of the valve seat.
En særlig fordel med en således udformet, løs ventilskive er, at den kan gøres meget let. Ved et kortvarigt undertryk efterfulgt af et overtryk kastes først både trykskiven og ventilskiven opad, men ved overgangen til overtryk vender 30 sidstnævnte tilbage til lukket stilling meget hurtigere end trykskiven, som har en større masse. Selv om den lette ventilskive ikke skulle tætne fuldstændigt med det samme, opnås under alle omstændigheder en kraftig drøvling, indtil 4A particular advantage of such a loose valve disc is that it can be made very light. At a short-term negative pressure followed by an overpressure, both the pressure washer and the valve disc are first thrown upwards, but at the transition to overpressure, the latter returns to the closed position much faster than the pressure disc, which has a larger mass. In any case, even if the lightweight valve disc should not completely close completely, a vigorous swirling is achieved until 4
DK 155687 BDK 155687 B
Ved den kendte udformning med blot en ringformet ventilskive bibringes en fra begyndelsen skråtstillet ventilskive let en rullende bevægelse ved lukningen, hvilket i høj grad forsinker lukningsbevægelsen. En sådan ulempe findes ikke hos 5 ventilen ifølge opfindelsen, idet trykskiven forhindrer skråstilling af ventilskiven. Gennemstrømningsarealet behøver ikke at blive begrænset ved en begrænset bevægelsesmulighed for ventilskiven, eftersom denne bevægelse uden vanskelighed kan gøres praktisk talt vilkårligt stor. Det er snarere arealet 10 mellem de koncentriske ringe, der danner ventilsædet, som bestemmer gennemstrømningsarealet, hvilket areal, som det let ses, kan bibringes den nødvendige størrelse, uden at udluftningsventilens dimensioner bliver uhensigtsmæssigt store. Da den af elastisk materiale fremstillede ventilskive 15 er indrettet til at blive belastet af den styrede trykskive, vil en opstående mindre skævhed på ventilskiven ikke påvirke dennes funktion i mærkbar grad.In the known design with just an annular valve disc, a initially inclined valve disc is easily imparted a rolling movement at the closure, which greatly delays the closing movement. Such a disadvantage is not found in the valve according to the invention, since the pressure washer prevents slanting of the valve disk. The flow area need not be limited by a limited movement of the valve disc, since this movement can easily be practically arbitrarily large. Rather, it is the area 10 between the concentric rings that form the valve seat that determines the flow area, which area, as can be readily seen, can be imparted to the required size without the dimensions of the vent valve becoming inappropriately large. Since the valve disc 15 made of elastic material is arranged to be loaded by the controlled pressure disc, an upstanding minor bias on the valve disc will not appreciably affect its function.
En udførelsesform for ventilen ifølge opfindelsen er vist på tegningen og skal beskrives i det følgende under henvisning 20 dertil. Tegningens venstre halvdel viser et langsgående billede af ventilhuset i snit, og den højre halvdel viser ydermere ventil- og trykskiverne i snit.An embodiment of the valve according to the invention is shown in the drawing and will be described below with reference to it. The left half of the drawing shows a longitudinal view of the valve body in section, and the right half further shows the valve and pressure discs in section.
Den på tegningen viste udluftningsventil omfatter en nedre rørstuds 1, hvis øvre ende er udformet som et indre ventil-25 sæde 2. En med rørstudsen 1 koncentrisk yderring 3 med et ydre ventilsæde 4 er forbundet med rørstudsen 1 gennem radiale stage 5. Åbningen mellem ventilsæderne 2 og 4 danner et ringformet luftindtag 6 for atmosfærisk luft.The vent valve shown in the drawing comprises a lower pipe nozzle 1, the upper end of which is formed as an inner valve seat 2. A concentric outer ring 3 with the pipe nozzle 1 with an outer valve seat 4 is connected to the pipe nozzle 1 through radial stage 5. The opening between the valve seats 2 and 4 form an annular air intake 6 for atmospheric air.
Udluftningsventilens yderring 3 er opadtil udformet med et 30 tag 7, som ved visse anvendelser lukker det således dannede ventilkammer 8, men som her er forsynet med en åbning 9 ogThe outer ring 3 of the vent valve is upwardly formed with a roof 7, which in certain applications closes the valve chamber 8 thus formed, but which is provided here with an opening 9 and
DK 155687 BDK 155687 B
5 en øvre rørstuds 10. Ved hjælp af rørstudsene 1 og 10 kan udluftningsventilen indkobles i et ikke vist vandledningssystem .5 an upper pipe nozzle 10. With the aid of the pipe nozzles 1 and 10, the vent valve can be connected in a water pipe system not shown.
Odluftningsventilens bevægelige ventillegeme består her af 5 to separate ringformede dele, nemlig en let ventilskive 11 af elastisk materiale og en af stift materiale bestående trykskive 12 med en aksial væg 13 langs omkredsen. Tryk-skiven 12 er, når ventilen skal gennemløbes af eller indeholder væske, hæftet eller på anden passende måde forenet 10 langs anlægs fladen med ventilskiven 11 for at væske ikke skal trænge ind på ventilskivens øvre flade og udsætte den for et alt for stort deformerende tryk. Væggen 13 kan være ubrudt eller, som vist på tegningen, have åbninger 14 for at spare materiale og mindske vægten. Eventuelt kan den 15 ubrudte øvre kant af væggen 13 undværes, hvorved der af væggen 13 kun er aksiale stave 15 tilbage.The movable valve body of the evaporative valve here consists of two separate annular parts, namely a light valve disc 11 of elastic material and a rigid material pressure disc 12 with an axial wall 13 along the circumference. The pressure washer 12, when the valve is to be passed through or contains liquid, is bonded or otherwise suitably 10 along the abutment surface with the valve disk 11 so that liquid does not penetrate the upper surface of the valve disc and expose it to excessive deforming pressure. . The wall 13 may be unbroken or, as shown in the drawing, have openings 14 to save material and reduce the weight. Optionally, the 15 unbroken upper edge of the wall 13 can be avoided, leaving only the axial rods 15 of the wall 13.
Ventilen er normalt lukket, som vist på tegningen. Når et undertryk opstår i rørstudsen 10 og dermed i ventilhuset 8, og dette når op på ca. 5 mm vs, løfter det atmosfæriske 20 tryk, som virker på ventilskivens 11 underside, ventilskiven og trykskiven 12 opad, så at luft kan strømme ind gennem luftåbningen 6 og udligne undertrykket. Ventilskiven 11 holdes derved i vandret stilling af trykskiven 12, hvis væg 13 forhindrer skråstilling af trykskiven 12. Når under-25 trykket ophører eller efterfølges af et overtryk vender ventilskiven 11 og trykskiven 12 tilbage til deres på tegningen viste stillinger, hvorved den første kan lukke eller i det mindste kraftigt drøvle åbningen 6 allerede inden trykskiven 12 har indtaget den viste stilling.The valve is normally closed, as shown in the drawing. When a negative pressure occurs in the pipe nozzle 10 and thus in the valve housing 8, this reaches approx. 5 mm vs, the atmospheric 20 pressure acting on the underside of the valve disc 11 raises the valve disc and pressure disc 12 so that air can flow through the air opening 6 and equalize the negative pressure. The valve disk 11 is thereby held in a horizontal position by the pressure disk 12, the wall 13 of which prevents oblique positioning of the pressure disk 12. When the negative pressure ceases or is followed by an overpressure, the valve disk 11 and the pressure disk 12 return to their positions shown in the drawing, whereby the first can close. or at least vigorously throttle the opening 6 even before the pressure washer 12 has taken the position shown.
30 Som nævnt ovenfor kan ventilen være udformet som en gennemstrømningsventil for gas eller fortrinsvis væske, men også som en ventil med en lukket åbning 9.As mentioned above, the valve may be designed as a gas or preferably fluid flow valve, but also as a valve with a closed opening 9.
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7904902A SE427687C (en) | 1979-06-05 | 1979-06-05 | VALVE |
| SE7904902 | 1979-06-05 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK241280A DK241280A (en) | 1980-12-06 |
| DK155687B true DK155687B (en) | 1989-05-01 |
| DK155687C DK155687C (en) | 1989-10-02 |
Family
ID=20338209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK241280A DK155687C (en) | 1979-06-05 | 1980-06-04 | VALVE WITH A RINGLE MOVABLE VALVE BODY |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS5635872A (en) |
| BE (1) | BE882040A (en) |
| CA (1) | CA1146441A (en) |
| CH (1) | CH648394A5 (en) |
| DE (2) | DE3021239A1 (en) |
| DK (1) | DK155687C (en) |
| ES (1) | ES8102317A1 (en) |
| FI (1) | FI70462C (en) |
| FR (1) | FR2458730A1 (en) |
| GB (1) | GB2051315B (en) |
| IT (1) | IT1131266B (en) |
| NL (1) | NL8003267A (en) |
| NO (1) | NO152266C (en) |
| SE (1) | SE427687C (en) |
| ZA (1) | ZA803195B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE895071A (en) * | 1982-11-19 | 1983-03-16 | Ericson Sture | AUTOMATIC AIR VALVE DEVICE FOR PIPES |
| DE3537157A1 (en) * | 1985-09-10 | 1987-07-30 | Baelz Juergen Controls | Device for shutting off a pipeline, in particular drinking-water line |
| DE3532180C1 (en) * | 1985-09-10 | 1987-04-30 | Baelz Juergen Controls | Device for shutting off a pipeline, especially a drinking-water line |
| SE9502280L (en) * | 1995-06-22 | 1996-09-09 | Durgo Ab | Vent valve |
| US6308731B1 (en) | 1999-06-25 | 2001-10-30 | Itz Corporation | Vent valve |
| EP2115226A4 (en) * | 2007-02-21 | 2014-01-08 | Orc Technology Pty Ltd | Sewer overflow relief device |
| JP6017196B2 (en) * | 2012-06-22 | 2016-10-26 | 兼工業株式会社 | Vacuum breaker |
| CN108411989A (en) * | 2018-05-17 | 2018-08-17 | 常州机电职业技术学院 | A kind of device keeping drainage pipeline internal pressure balance to prevent foul smell from overflowing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2928413A (en) * | 1954-10-20 | 1960-03-15 | Black Sivalls & Bryson Inc | Relief valve |
| US4142549A (en) * | 1977-09-19 | 1979-03-06 | The B. F. Goodrich Company | Relief valve |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE374134C (en) * | 1923-04-20 | Albert Manjock | Automatic air valve with flexible sealing surface to prevent odor traps from being sucked out | |
| CH191189A (en) * | 1936-10-01 | 1937-06-15 | Similor Sa | Ventilation device for siphon. |
| US3025870A (en) * | 1960-02-09 | 1962-03-20 | Scovill Manufacturing Co | Anti-siphonic device |
| DE6928070U (en) * | 1968-08-08 | 1969-12-04 | Nyberg Carl E J | VACUUM PROTECTION VALVE |
| SE377146B (en) * | 1973-10-15 | 1975-06-23 | Ba Installationsutveckling Ab |
-
1979
- 1979-06-05 SE SE7904902A patent/SE427687C/en unknown
-
1980
- 1980-02-26 FR FR8004248A patent/FR2458730A1/en active Granted
- 1980-03-03 BE BE0/199643A patent/BE882040A/en not_active IP Right Cessation
- 1980-05-19 FI FI801604A patent/FI70462C/en not_active IP Right Cessation
- 1980-05-28 ZA ZA00803195A patent/ZA803195B/en unknown
- 1980-06-02 CA CA000353182A patent/CA1146441A/en not_active Expired
- 1980-06-02 GB GB8017990A patent/GB2051315B/en not_active Expired
- 1980-06-03 NO NO801655A patent/NO152266C/en unknown
- 1980-06-04 IT IT22552/80A patent/IT1131266B/en active
- 1980-06-04 DE DE19803021239 patent/DE3021239A1/en active Granted
- 1980-06-04 DK DK241280A patent/DK155687C/en active
- 1980-06-04 NL NL8003267A patent/NL8003267A/en not_active Application Discontinuation
- 1980-06-04 JP JP7442880A patent/JPS5635872A/en active Granted
- 1980-06-04 DE DE19808014992U patent/DE8014992U1/en not_active Expired
- 1980-06-04 CH CH4320/80A patent/CH648394A5/en not_active IP Right Cessation
- 1980-06-04 ES ES492151A patent/ES8102317A1/en not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2928413A (en) * | 1954-10-20 | 1960-03-15 | Black Sivalls & Bryson Inc | Relief valve |
| US4142549A (en) * | 1977-09-19 | 1979-03-06 | The B. F. Goodrich Company | Relief valve |
Also Published As
| Publication number | Publication date |
|---|---|
| NO152266C (en) | 1985-08-28 |
| ZA803195B (en) | 1981-05-27 |
| JPH0135235B2 (en) | 1989-07-24 |
| IT8022552A0 (en) | 1980-06-04 |
| SE427687C (en) | 1989-11-16 |
| FI70462C (en) | 1986-09-19 |
| DE8014992U1 (en) | 1982-01-21 |
| NO801655L (en) | 1980-12-08 |
| ES492151A0 (en) | 1980-12-16 |
| IT1131266B (en) | 1986-06-18 |
| GB2051315B (en) | 1983-03-16 |
| DK241280A (en) | 1980-12-06 |
| NO152266B (en) | 1985-05-20 |
| BE882040A (en) | 1980-07-01 |
| FR2458730A1 (en) | 1981-01-02 |
| FI70462B (en) | 1986-03-27 |
| FR2458730B1 (en) | 1982-11-26 |
| ES8102317A1 (en) | 1980-12-16 |
| GB2051315A (en) | 1981-01-14 |
| DE3021239A1 (en) | 1980-12-11 |
| CH648394A5 (en) | 1985-03-15 |
| SE427687B (en) | 1983-04-25 |
| NL8003267A (en) | 1980-12-09 |
| CA1146441A (en) | 1983-05-17 |
| DK155687C (en) | 1989-10-02 |
| JPS5635872A (en) | 1981-04-08 |
| SE7904902L (en) | 1980-12-06 |
| FI801604A (en) | 1980-12-06 |
| DE3021239C2 (en) | 1990-05-10 |
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