USRE37989E1 - Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere - Google Patents

Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere Download PDF

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Publication number
USRE37989E1
USRE37989E1 US09/754,817 US75481701A USRE37989E US RE37989 E1 USRE37989 E1 US RE37989E1 US 75481701 A US75481701 A US 75481701A US RE37989 E USRE37989 E US RE37989E
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US
United States
Prior art keywords
valve
pressure relief
stem
lifting disc
relief valve
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 - Lifetime
Application number
US09/754,817
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English (en)
Inventor
Hans-Henrick Raagaard Pedersen
Anders Ib Damborg Petersen
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Individual
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Priority to US09/754,817 priority Critical patent/USRE37989E1/en
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    • 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
    • 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
    • F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
    • F16K17/19—Equalising valves predominantly for tanks
    • F16K17/194—Equalising valves predominantly for tanks weight-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
    • F16K17/12—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side weight-loaded
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7738—Pop valves
    • Y10T137/774—Pop pressure reactor in inflow to valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7771—Bi-directional flow valves
    • Y10T137/7779—Axes of ports parallel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7908—Weight biased
    • Y10T137/7909—Valve body is the weight
    • Y10T137/7913—Guided head
    • Y10T137/7915—Guide stem
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7904—Reciprocating valves
    • Y10T137/7908—Weight biased
    • Y10T137/7921—Weight coaxial with valve

Definitions

  • the invention relates to a pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere, and particularly to such pressure relief valves used in tankers for oil products and chemicals.
  • this field of use will be taken as point of departure, but it will be understood that the same principles will be equally applicable to other fields of use, e.g., for stationary storage tanks or for rolling transportation tanks for liquid petroleum products or chemicals.
  • the associated pressure relief valve When a certain volumetric quantity of product per time unit, e.g., measured in m 3 /h, is loaded into a tank, the associated pressure relief valve is to be opened when the pressure in the tank has risen above a pre-set closing pressure, and thereafter a quantity of gas is to be blown off per time unit corresponding to the quantity of product loaded per time unit with an addition, where applicable, for evaporation from the liquid surface in the tank.
  • the blow-off quantity per time unit depends on the flow resistance of the valve—and thereby on the lifting height of the valve—and on the pressure in the tank.
  • the volumetric quantity of product loaded per time unit is referred to as the loading rate (e.g. m 3 /h), and the volumetric quantity of gas blown off per time unit as the blow-off rate (likewise e.g. m 3 /h).
  • the blow-off velocity which means the linear velocity at which the gas is blown off through the valve opening, e.g., measured in m/sec..
  • the invention relates to a pressure relief valve which includes a valve housing provided at its top with a blow-off opening formed with an upwardly-facing, substantially conical valve seat, a drop-shaped body suitable for concentrating a flow of gas impinging on its underside to an upwardly-directed jet, a substantially conical valve face for closing against the valve seat being formed on the downwardly-facing portion of the rounded surface of the drop-shaped body, which thereby constitutes a valve body, and a lifting disc connected with the drop-shaped body and located at a lower level within the housing, the lifting disc having an outer diameter greater than the inner diameter of the valve seat, stop means for defining a fully open position of the valve, the lifting disc being surrounded by a free passage slot in the closed position of the valve.
  • the lifting pressure is shifted at the initiation of the opening from the smaller area of the underside of the drop-shaped member within the valve seat to the larger area of the lifting disc, whereby a higher lifting speed is obtained.
  • the valve housing has an inner configuration such that the free passage area around the lifting disc is increased when the drop-shaped body and the lifting disc are lifted, whereby also at increasing blow-off quantity, a lower pressure is obtained than would otherwise be possible, until the valve approaches its fully open condition.
  • valve housing with an inner configuration such that the free passage area around the lifting disc is decreased when the drop-shaped body and the lifting disc are lifted from the closed to the fully open position.
  • FIG. 1 shows a side view, partially sectioned, of a pressure relief valve according to a preferred embodiment of the invention, the valve being illustrated in its closed position
  • FIG. 2 is a corresponding illustration of the valve in its fully open position
  • FIGS. 3 and 4 are graphs representing the tank pressure and the blow-off velocity, respectively, as plotted against the volumetric blow-off quantity per time unit, as determined for a prototype of a pressure relief valve constructed in accordance with the invention.
  • 1 is a vertically oriented valve housing, which at its lower end has a flange 2 which is bolted to a flange 3 of a tubular socket 4 constructed at its lower end with a flange 5 that can be bolted to a pressure relief outlet of an oil tank or to the upper end of a pressure relief pipe connected to one or more tank compartments.
  • the socket 4 has a lateral opening 6 to which a vacuum relief valve 7 is connected. This valve will not be described in detail, because it does not form part of the invention.
  • valve housing At its lower end the valve housing has a cylindrical wall portion 8 which is an upward direction is followed by a converging wall portion 9 and thereafter a cylindrical wall portion 10 . At its top the valve housing is terminated by a blow-off opening 11 .
  • a mouth ring 12 at the inner side of which a conical valve seat 13 is formed.
  • a drop-shaped body 14 on the underside of which a conical valve surface 15 is formed which in the closed condition of the valve sealingly engages the valve seat 13 .
  • an annular elastic gasket may be arranged on the inner side of the mouth ring for engaging the underside of the drop-shaped body 14 , as disclosed in WO 90/10168.
  • a stem 18 is connected to the drop-shaped body and extends down through the housing where it is guided and supported by an upper stem guide and stop 19 in the valve housing and a lower stem guide 20 in the socket 4 .
  • the stem 18 carries a lifting disc 21 which in the closed position of the valve is located in the interior of the cylindrical wall portion 8 and has a slightly smaller diameter than the latter so that a free passage slot 22 is formed around the lifting disc.
  • Under the lower end of the stem 18 there is mounted a rocking lever 24 for use in check-lift of the valve.
  • the stem 18 carries a weighting load 23 between the upper stem guide 19 and the lifting disc 21 .
  • the structure referred to herein as the flow-off controlling member, including the drop-shaped body 14 , the stem 18 , the weighting load 23 , and the lifting disc 21 , is subjected to a downwardly directed closing force equal to the total weight of all parts of the structure.
  • the weighting load 23 may be supplemented or replaced by a compressional spring, as disclosed in WO 90/10168.
  • the velocity of the blow-off gas is determined by the blow-off rate and the passage area around the lifting disc and can therefore also be determined, as illustrated in FIG. 4 .
  • FIG. 3 illustrates that at blow-off rates varying from zero up to a certain boundary value, the pressure varies along a flat curve first upwards and then back to the closing pressure value.
  • the boundary value is exceeded, the pressure drops abruptly to the same value as it would have had if the valve had been fully open from the start, as indicated by the dotted graph portion.
  • the valve remains fully open, and the tank pressure increases further, and when it assumes the value P max , the blow-off rate has reached the maximum permissible value, which is referred to as the capacity of the pressure relief valve. If, during loading of the tank, the loading rate, with deduction for evaporation, if any, is kept below the capacity of the pressure relief valve, the tank is, within a substantial safety margin, protected against explosion.
  • blow-off rate subdivides the available range of blow-off rates into a lower range in which the influence of the blow-off rate on the tank pressure and thereby on the lifting force acting on the valve is very small, and an upper range in which the pressure relief valve is constantly in its fully open position.
  • the blow-off velocity of gas through the valve will be so high at very low blow-off rates that it is beyond illustration.
  • the blow-off velocity of gas through the valve will be so high at very low blow-off rates that it is beyond illustration.
  • At increasing blow-off rates it decreases to a minimum value at or about the boundary value of the blow-off rate.
  • the dimensioning should be such that this minimum value is well above the minimum value V min prescribed for high velocity valves, e.g. 30 m/sec.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
US09/754,817 1994-07-08 1995-05-31 Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere Expired - Lifetime USRE37989E1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09/754,817 USRE37989E1 (en) 1994-07-08 1995-05-31 Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DK081794A DK171444B1 (da) 1994-07-08 1994-07-08 Trykaflastningsventil til trykudligning mellem et lukket rum og den omgivende atmosfære
DK817/94 1994-07-08
PCT/DK1995/000212 WO1996001962A1 (en) 1994-07-08 1995-05-31 Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere
US08/765,641 US5873384A (en) 1994-07-08 1995-05-31 Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere
US09/754,817 USRE37989E1 (en) 1994-07-08 1995-05-31 Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US08/765,641 Reissue US5873384A (en) 1994-07-08 1995-05-31 Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere

Publications (1)

Publication Number Publication Date
USRE37989E1 true USRE37989E1 (en) 2003-02-18

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Family Applications (2)

Application Number Title Priority Date Filing Date
US08/765,641 Expired - Lifetime US5873384A (en) 1994-07-08 1995-05-31 Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere
US09/754,817 Expired - Lifetime USRE37989E1 (en) 1994-07-08 1995-05-31 Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US08/765,641 Expired - Lifetime US5873384A (en) 1994-07-08 1995-05-31 Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere

Country Status (12)

Country Link
US (2) US5873384A (ja)
EP (1) EP0770197B1 (ja)
JP (1) JP3645570B2 (ja)
KR (1) KR100369311B1 (ja)
CN (1) CN1046993C (ja)
CA (1) CA2194477C (ja)
DE (1) DE69502500T2 (ja)
DK (1) DK171444B1 (ja)
ES (1) ES2116090T3 (ja)
FI (1) FI107349B (ja)
NO (1) NO308184B1 (ja)
WO (1) WO1996001962A1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070113902A1 (en) * 2005-11-22 2007-05-24 Youngman Kim Relief valve assembly
WO2009039857A1 (en) * 2007-09-27 2009-04-02 Bay Valves Aps Pressure relief valve
US20110168181A1 (en) * 2010-01-13 2011-07-14 Dräger Medical GmbH Device for pressure equalization on a medical gas delivery means

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1002502C2 (nl) 1996-03-01 1997-09-03 Ide Albert Van Der Velde Vlamwerende drukvereffeningsklep.
US6263907B1 (en) * 1998-08-28 2001-07-24 Korea Steel Power Co., Ltd. Valve device of a storage tank for transporting oils or chemical compounds
NO992762D0 (no) * 1999-06-07 1999-06-07 John Gjerde As Sikkerhetsventil
CN1304776C (zh) * 2001-05-25 2007-03-14 普瑞斯-维科工程公司 压力阀
US6604544B2 (en) * 2001-07-16 2003-08-12 Tank Tech Co., Ltd. Safety valve of tank for storing and carrying oil or chemical substance
NO316469B1 (no) * 2002-05-03 2004-01-26 Ventiq As Sikkerhetsventil
CN1955526B (zh) * 2005-10-28 2010-04-07 联合科技株式会社 安全阀组件
CN1955525B (zh) * 2005-10-28 2010-05-12 托普塞弗有限公司 真空安全阀
JP5989012B2 (ja) 2011-03-14 2016-09-07 ラヴァル・エー・シー・エス・リミテッド 燃料弁
CN102748517B (zh) * 2011-04-22 2014-01-29 盐城中油船舶海洋工程科技有限公司 高效的货油舱高速透气阀盖
KR101218668B1 (ko) * 2011-06-10 2013-01-04 탱크테크 (주) 지렛대 원리를 이용한 고속배출밸브
JP5539282B2 (ja) * 2011-09-22 2014-07-02 新倉工業株式会社 リリーフ弁
KR102018404B1 (ko) 2011-12-09 2019-09-04 프레스-바크 엔지니어링 에이피에스 감압 밸브
WO2014012967A1 (en) * 2012-07-18 2014-01-23 Pres-Vac Engineering Aps A pressure relief valve
NO20161209A1 (en) * 2016-07-21 2017-11-27 Ventiq As Pressure relief valve

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE63490C (de) NACHTIGALL & JACOBY in Leipzig Sicherheitsventil mit Prellscheibe zur Vergröfserung des Hubes
US253622A (en) 1882-02-14 pearson
US5060688A (en) 1989-02-24 1991-10-29 Sorensen Emil A Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere
US6029706A (en) 1998-08-28 2000-02-29 Korea Steel Power Co. Ltd. Valve of a storage tank for transporting oils or chemical compounds

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667891A (en) * 1948-03-22 1954-02-02 Proctor Electric Co Pressure-operated actuating and relief valve
US4181144A (en) * 1977-12-22 1980-01-01 Caterpillar Tractor Co. Hydraulically limited fuel injection nozzle
US4474208A (en) * 1983-04-13 1984-10-02 Baird Manufacturing Company Safety valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE63490C (de) NACHTIGALL & JACOBY in Leipzig Sicherheitsventil mit Prellscheibe zur Vergröfserung des Hubes
US253622A (en) 1882-02-14 pearson
US5060688A (en) 1989-02-24 1991-10-29 Sorensen Emil A Pressure relief valve for pressure equalization between a closed space and the surrounding atmosphere
US6029706A (en) 1998-08-28 2000-02-29 Korea Steel Power Co. Ltd. Valve of a storage tank for transporting oils or chemical compounds

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070113902A1 (en) * 2005-11-22 2007-05-24 Youngman Kim Relief valve assembly
US7445020B2 (en) 2005-11-22 2008-11-04 Unitech Co., Ltd. Relief valve assembly
WO2009039857A1 (en) * 2007-09-27 2009-04-02 Bay Valves Aps Pressure relief valve
US20110168181A1 (en) * 2010-01-13 2011-07-14 Dräger Medical GmbH Device for pressure equalization on a medical gas delivery means
US8453647B2 (en) * 2010-01-13 2013-06-04 Dräger Medical GmbH Device for pressure equalization on a medical gas delivery means

Also Published As

Publication number Publication date
FI970070A (fi) 1997-01-07
US5873384A (en) 1999-02-23
KR970704989A (ko) 1997-09-06
FI107349B (fi) 2001-07-13
ES2116090T3 (es) 1998-07-01
DE69502500T2 (de) 1998-11-19
EP0770197A1 (en) 1997-05-02
NO970035D0 (no) 1997-01-06
CN1046993C (zh) 1999-12-01
WO1996001962A1 (en) 1996-01-25
EP0770197B1 (en) 1998-05-13
DE69502500D1 (de) 1998-06-18
DK81794A (da) 1996-01-09
KR100369311B1 (ko) 2003-11-20
NO308184B1 (no) 2000-08-07
CN1152348A (zh) 1997-06-18
JP3645570B2 (ja) 2005-05-11
NO970035L (no) 1997-01-06
DK171444B1 (da) 1996-10-28
JPH10502437A (ja) 1998-03-03
FI970070A0 (fi) 1997-01-07
CA2194477C (en) 2005-01-04
CA2194477A1 (en) 1996-01-25

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