US20040065385A1 - Vacuum relief unit with means preventing the effects of an accident - Google Patents

Vacuum relief unit with means preventing the effects of an accident Download PDF

Info

Publication number
US20040065385A1
US20040065385A1 US10/450,383 US45038303A US2004065385A1 US 20040065385 A1 US20040065385 A1 US 20040065385A1 US 45038303 A US45038303 A US 45038303A US 2004065385 A1 US2004065385 A1 US 2004065385A1
Authority
US
United States
Prior art keywords
valve housing
movable part
piston
vacuum relief
relief unit
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
Application number
US10/450,383
Other languages
English (en)
Inventor
Emil Sorensen
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.)
Pres Vac Engineering AS
Original Assignee
Pres Vac Engineering AS
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 Pres Vac Engineering AS filed Critical Pres Vac Engineering AS
Assigned to PRES-VAC ENGINEERING A/S reassignment PRES-VAC ENGINEERING A/S ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SORENSEN, EMIL AARESTRUP
Publication of US20040065385A1 publication Critical patent/US20040065385A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • 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
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/14—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed pressurised

Definitions

  • the present invention relates to an improved vacuum relief unit for pressure equalisation between the ambient atmosphere and a tank in a tanker, wherein the vacuum relief unit comprises: a) a valve housing with a first opening, whereby the valve housing is able to communicate with the tank, and a second opening with a seat for a valve body that is configured for being conveyable into the valve housing to allow inflow of air into the tank; and b) a mechanism configured for preventing the passage of water through the valve housing in case of an accident when the tanker is at least partially immersed into seawater, said mechanism having a first movable part that is arranged outside the valve housing and whose movement can be controlled by the liquid pressure of the seawater, and a second movable part that can be advanced within the valve housing and is movably coupled to the first movable part.
  • the term “movably coupled” as used in this context is intended to designate that a movement of the first part is transmitted to a movement of the second part.
  • Vacuum relief units are used in tankers for ensuring a pressure equalisation when the tank of the vessel is emptied and to serve as safety measure in case of erroneous operation of the tankers filling plant, eg as described more specifically in U.S. Pat. No. 5,607,001.
  • U.S. Pat. No. 5,607,001 specifically teaches a vacuum relief unit, shown by the reference numeral 50 .
  • the vacuum relief unit has a valve body that is automatically conveyed away from a valve seat at a given pressure difference to allow inflow of air into the tank.
  • the invention relates to an improved vacuum release unit, whereby it is possible, by means of a modest number of components, to restrict the movement range of the valve body away from the valve seat in case the vessel wrecks.
  • the invention is suitable for use in particular in connection with valve devices of the kind taught in U.S. Pat. No. 5,607,001; but it may also be applicable, however, in connection with valve devices that do not feature a pressure relief device.
  • the invention distinguishes itself by being suitable, in many cases, for utilisation in connection with restructuring valve devices that are already in existence of precisely the kind described in the latter patent disclosure.
  • the second movable part being configured for being conveyed into abutment on the valve body by an increasing movement of the first movable part in order to cause the valve body to return to its abutment on the seat.
  • the invention relies on the finding that the hydrostatic pressure that attempts to move the valve body away from its abutment on the valve seat when the vessel is immersed can be used to close the valve body by providing means that are per se influenced by the hydrostatic pressure and that influence the valve body by a force that can move the valve body towards the valve seat.
  • the vacuum relief unit can thus in a simple manner be configured as featured in claim 4 .
  • FIG. 1 is a cross sectional view through a preferred embodiment of the vacuum relief unit for mounting on a tanker;
  • FIG. 2 is an enlarged sectional view of FIG. 1.
  • the vacuum relief device can obviously be configured as a unit that is built into a tanker separately from the pressure relief device.
  • I is used to designate a preferably vertically oriented valve device with a socket 4 that has, at its lower end, a flange 5 that can be bolted to a bead on a tank or to the upper end of a pressure equalisation pipe that is connected to one or more tanks in the tanker.
  • the socket 4 has a lateral opening 6 to which a vacuum relief unit 10 according to the invention is connected.
  • a pressure relief unit 8 that is arranged above the lateral opening 6 will not be subject to more detailed description, as it does not form a part of the present invention.
  • the pressure relief device 8 can be for instance of the kind taught in U.S. Pat. No. 5,607,001.
  • the vacuum relief unit 10 comprises a valve housing 20 that has, at its one end, a connecting part 22 , whereby the valve housing 20 can—by means of conventional connecting means—be connected to the lateral opening 6 , to a pressure equalisation tube or directly to a tank in a vessel.
  • the connecting portion 22 defines a first opening 12 of the valve housing 20 .
  • the valve housing 20 also has a second opening 24 in which a valve seat 30 is arranged that features a guide 32 for a valve bar 45 .
  • the valve seat 30 forms an abutment for a valve body 40 that carries said valve bar 45 and has, on the side that faces towards the valve housing 20 interior, a central area 42 with adjoining face portions 44 .
  • the internally and externally pressure-influenced surfaces, respectively, of the valve body 40 that produce a movement away from and towards the valve seat 30 has an area A 3 .
  • the valve body 40 has a predetermined mass and may optionally be spring-biased. Hereby a certain abutment force Fl is obtained between the valve body 40 and the valve seat 30 , whereby a given sealing of the second opening 24 can be ensured. It will be understood that, in case of a sub-atmospheric pressure in the tank, the valve body 40 will be lifted away from its abutment on the valve seat 30 , whereby air is, in normal operating conditions of the vessel, able to flow into the tank from the outside and permit a pressure equalisation.
  • a pushbutton-like device 21 is also arranged that enables checking of the performance of the vacuum relief unit 10 during normal operation.
  • the valve housing 10 has a flange 28 that delimits a third opening 26 in the valve housing 10 , and to which a mechanism 100 is firmly bolted that may, as will be described more detailed below, be released automatically in case the ship sinks.
  • a mechanism 100 is firmly bolted that may, as will be described more detailed below, be released automatically in case the ship sinks.
  • the configuration of the valve housing 10 corresponds to the teachings of U.S. Pat. No. 5,607,001, wherein said third opening is covered by a firmly bolted board.
  • the mechanism 100 is shown in an enlarged scale in FIG. 2 and comprises a bottom plate 110 that is intended for being secured in close abutment on the flange 28 .
  • a preferably cylindrical housing 120 extends that has an upper cover plate 130 with mounting apertures 134 .
  • the housing 120 is mounted in close abutment on the bottom plate 110 by means of a sealing means 116 .
  • the cover late 130 is secured to the bottom plate 110 by means of a number of bar elements 140 that extend through the mounting apertures 134 and are mounted in indentations 114 in the bottom plate 110 .
  • By means of bolts 145 it is possible to remove the cover plate 130 to obtain access to the interior of the mechanism 100 .
  • a first movable part is arranged in the form of a piston 160 that is firmly connected to a second movable part in the form of a piston rod 150 and has a surface area A 1 .
  • the housing 120 , the piston 160 and the bottom plate 110 define between them a space 102 that is preferably filled with air or other readily compressible gas.
  • the piston rod 150 is displaceably journalled in a through-going aperture 112 in the bottom plate 110 , whereby the piston can be moved in the direction of the arrow P.
  • a spring 155 serves to bias the piston 160 in a direction towards the starting position shown in FIGS.
  • the piston 160 is in the form of a rigid plate; it may, however, be configured in other ways, eg as a resilient membrane that is connected to the piston rod 150 .
  • the elasticity of the membrane may, in that case, be utilised to the effect that the spring 155 can be eliminated.
  • a space 103 occurs between the cover plate 130 and the top face of the piston 160 , and this space 103 communicates with the exterior via openings 132 in the cover late 130 .
  • an open-mesh grid 105 or alike is preferably arranged that serves merely to prevent entry of insects or the like to the mechanism 100 .
  • the piston 160 is sealed relative to the inside of the housing 120 by a sealing means 165
  • the piston rod 150 is sealed relative to the interior of the valve housing 20 by a sealing mans 117
  • the piston rod 150 has an end 152 , whose surface area A 2 is significantly smaller than the surface area A 1 of the piston 160 .
  • Said end 152 enters in the valve housing 20 interior immediately above the central area 42 of the valve body 40 , as will appear clearly from FIG. 1. It will be understood, that the piston rod 150 and the valve body 40 are preferably controlled such that the end 152 and the central area 42 move linearly towards each other by pressure influences on the piston 160 and the valve body 40 , respectively.
  • the area A 1 of the piston 160 , the length of the piston rod 150 , the spring force of the spring 155 and the resistance to the movement 160 of the piston due to the pressure Pc interiorly 102 of the housing 120 is, in accordance with the invention, dimensioned such that the end 152 of the piston rod 150 will, in case of usually prevailing sub-atmospheric pressure in the tank, move towards the central area 42 of the valve body 20 , but not so far that the end 152 arrives to abut on the central area 42 before the valve body 40 has moved slightly away from the valve seat 30 having allowed an equalisation of the difference in pressure. Following this pressure equalisation, the piston 160 will move back to the starting position.
  • Such dimensioning must thus take into account the abutment force F 1 between the valve body 40 and the valve seat 30 .
  • Pi is the pressure within the tank
  • F 2 is the force as a result of the mass of the piston 160 ;
  • F 4 and Pc are the spring force and the pressure in the interior 102 of the mechanism, respectively, when the end 152 of the piston 160 is advanced towards the valve body.
  • the piston rod 150 is shown to be arranged immediately opposite the valve body 40 and thus will move opposite the movement direction of the valve body 40 , obviously nothing prevents the mechanism from being arranged in any other manner, as long as the piston rod 150 can, by its movement, cause the valve body 40 to abut on the valve seat 30 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Safety Valves (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Details Of Valves (AREA)
US10/450,383 2000-12-21 2001-12-20 Vacuum relief unit with means preventing the effects of an accident Abandoned US20040065385A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DKPA200001919 2000-12-21
DK200001919A DK200001919A (da) 2000-12-21 2000-12-21 En ventil
PCT/DK2001/000850 WO2002060751A1 (en) 2000-12-21 2001-12-20 Vacuum relief unit with means preventing the effects of an accident

Publications (1)

Publication Number Publication Date
US20040065385A1 true US20040065385A1 (en) 2004-04-08

Family

ID=8159920

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/450,383 Abandoned US20040065385A1 (en) 2000-12-21 2001-12-20 Vacuum relief unit with means preventing the effects of an accident

Country Status (11)

Country Link
US (1) US20040065385A1 (zh)
EP (1) EP1343680A1 (zh)
JP (1) JP2004517771A (zh)
KR (1) KR20040014439A (zh)
CN (1) CN1489538A (zh)
CA (1) CA2431923A1 (zh)
DK (1) DK200001919A (zh)
NO (1) NO20032847L (zh)
PL (1) PL362460A1 (zh)
RU (1) RU2003117798A (zh)
WO (1) WO2002060751A1 (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102748517A (zh) * 2011-04-22 2012-10-24 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
US9644756B2 (en) 2011-12-09 2017-05-09 Pres-Vac Engineering Aps Pressure relief valve
US9657847B2 (en) 2012-07-18 2017-05-23 Pres-Vac Engineering Aps Pressure relief valve
CN112298459A (zh) * 2020-09-22 2021-02-02 沪东中华造船(集团)有限公司 化学品船兼装环氧丙烷货舱及通风系统、压力安全阀锁定装置

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO332761B1 (no) * 2007-09-07 2013-01-07 Framo Eng As Undersjoisk ventilsystem og fremgangsmate for beskyttelse herav
JP5276611B2 (ja) * 2010-02-09 2013-08-28 三菱重工業株式会社 液化ガス運搬船に搭載される再液化装置
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
CN103791232B (zh) * 2012-10-31 2015-08-19 江苏新天宝机械有限公司 一种无菌呼吸器
CN103466054B (zh) * 2013-09-10 2016-07-13 上海羽翼船舶设备有限公司 用于减摇陀螺转子密封腔的真空发生装置
CN110877657A (zh) * 2019-11-15 2020-03-13 沪东中华造船(集团)有限公司 一种化学品船压载舱的安全保护方法
CN112298458A (zh) * 2020-09-22 2021-02-02 沪东中华造船(集团)有限公司 化学品船兼装环氧丙烷货舱的压力真空保护装置及使用方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2184773A (en) * 1938-04-12 1939-12-26 Claude V Birkhead Pressurestat
US2570937A (en) * 1948-02-11 1951-10-09 William Coulthard & Company Lt Valve for fluid-pressure systems
US3868921A (en) * 1972-06-14 1975-03-04 Bowman Jon G Normally vented liquid-storage tank for ships, with closure device for automatically preventing leaking if the ship should sink
US4157072A (en) * 1978-02-06 1979-06-05 Apv Corporation Combination pressure-vacuum relief and antipollution valve
US5213127A (en) * 1990-06-01 1993-05-25 Sorensen Emil A Vacuum valve for use in an emergency system for reducing the risk of escape from injuries under the waterline of tankers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK171445B1 (da) * 1994-08-04 1996-10-28 Soerensen Emil Aarestrup Sikkerhedsudstyr til en tank, der har et system til opsamling af den gas, der uddrives af tanken ved lastning

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2184773A (en) * 1938-04-12 1939-12-26 Claude V Birkhead Pressurestat
US2570937A (en) * 1948-02-11 1951-10-09 William Coulthard & Company Lt Valve for fluid-pressure systems
US3868921A (en) * 1972-06-14 1975-03-04 Bowman Jon G Normally vented liquid-storage tank for ships, with closure device for automatically preventing leaking if the ship should sink
US4157072A (en) * 1978-02-06 1979-06-05 Apv Corporation Combination pressure-vacuum relief and antipollution valve
US5213127A (en) * 1990-06-01 1993-05-25 Sorensen Emil A Vacuum valve for use in an emergency system for reducing the risk of escape from injuries under the waterline of tankers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102748517A (zh) * 2011-04-22 2012-10-24 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
US9644756B2 (en) 2011-12-09 2017-05-09 Pres-Vac Engineering Aps Pressure relief valve
US9657847B2 (en) 2012-07-18 2017-05-23 Pres-Vac Engineering Aps Pressure relief valve
CN112298459A (zh) * 2020-09-22 2021-02-02 沪东中华造船(集团)有限公司 化学品船兼装环氧丙烷货舱及通风系统、压力安全阀锁定装置

Also Published As

Publication number Publication date
KR20040014439A (ko) 2004-02-14
NO20032847L (no) 2003-08-20
WO2002060751A1 (en) 2002-08-08
PL362460A1 (en) 2004-11-02
NO20032847D0 (no) 2003-06-20
CN1489538A (zh) 2004-04-14
EP1343680A1 (en) 2003-09-17
CA2431923A1 (en) 2002-08-08
JP2004517771A (ja) 2004-06-17
DK200001919A (da) 2002-06-22
RU2003117798A (ru) 2004-12-20
WO2002060751A8 (en) 2004-04-29

Similar Documents

Publication Publication Date Title
US20040065385A1 (en) Vacuum relief unit with means preventing the effects of an accident
KR880006115A (ko) 탱크내 연료 저장용기 및 필터막
US4679581A (en) Fuel tank vent valve
US4715561A (en) Drain assembly for aircraft
JPH04365625A (ja) 燃料タンクの燃料遮断装置
US4068680A (en) Self-contained vent valve unit and system utilizing the same
US2560586A (en) Floating roof drain
EP2066937B1 (en) Liquid tank venting system
EP0003591B1 (en) Venting and anti-pollution device for a shipboard liquid storage tank
US5014735A (en) Automatic drain valve
US4366669A (en) Tank closure apparatus with safety feature
US4182388A (en) Fluid coupling system
CN112648465B (zh) 一种水锤消除罐
CN101523098A (zh) 液体料箱通气系统
US4222405A (en) Pressure vacuum breaker
KR100515934B1 (ko) 오버플로우 방지장치
US2661758A (en) Valve
JPH0411998Y2 (zh)
JP2512614B2 (ja) 空気弁のフロ―ト取付構造
CN216582068U (zh) 浮盘的单元箱体
SU707838A1 (ru) Затвор люка цистерны
JPS585197Y2 (ja) タンカ−用不活性ガス装置のプレッシャ−バキュ−ムブレ−カ−
SU1182230A1 (ru) Устройство дл отвода жидкости из вакуумных газопроводов
JPH0310478Y2 (zh)
KR200274712Y1 (ko) 인화성 저장탱크의 비상배출밸브

Legal Events

Date Code Title Description
AS Assignment

Owner name: PRES-VAC ENGINEERING A/S, DENMARK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SORENSEN, EMIL AARESTRUP;REEL/FRAME:014265/0782

Effective date: 20030524

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE