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 PDFInfo
- 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
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- 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
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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
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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
- 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 .
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- 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)
Abstract
The invention relates to a vacuum relief unit for pressure equalisation between the ambient atmosphere and a tank in a tanker, wherein the vacuum relief unit comprises: a valve housing (10) with a first opening (12), whereby the valve housing (10) is able to communicate with the tank, and a second opening (24) with a seat (30) for a valve body (40) that is configured for being conveyable into the valve housing (10) to permit inflow of air to the tank; and a mechanism (100) configured for being able to prevent passage of seawater through the valve housing (10) in case of an accident, wherein the tanker is at least partially immersed into seawater, which mechansim (100) features a first movable part (160) that is arranged outside the valve housing (10) and whose movement can be controlled by the liquid pressure of the sea water, a second movable part (150) that can be advanced within the valve housing (10) and that is movably coupled to the first movable part (160). The invention is characterised in that the second movable part (150) is configured for being conveyable to abut on the valve body (40) by an increasing movement of the first movable part (160) to cause the valve body (40) to return to its abutment on the seat (30).
Description
- 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.
- An important field of application for vacuum relief units of this type is use onboard tankers for oil products and chemicals.
- 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 numeral50. 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.
- One inconvenience in connection with this and similar vacuum relief units is that usually they do not take into account the extraordinary situation where, following an accident, the tanker is completely or partially immersed into the sea water. In such situation, the direct contact of the water with the valve body may be able to cause the valve body to move away from the valve seat, thereby allowing seawater to flow into the tank and slowly displace its content of oil and chemicals. Hereby a pollution of the seawater may occur.
- It has previously been attempted to provide vacuum relief units that are able to prevent inflow of seawater into the tank in case of an accident. Such vacuum relief unit is described in U.S. Pat. No. 3,868,921. However, that solution is of a complex structure with many components, which—on the one hand—makes the unit expensive to manufacture and—on the other increases the risk of malfunction of the unit in case just one of the many components fails.
- As mentioned above, 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 above advantages are achieved in accordance with claim1 by 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. Thus, 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.
- Advantageous embodiments of the invention will appear from the independent claims. The vacuum relief unit can thus in a simple manner be configured as featured in
claim 4. - The invention will now be described in further detail with reference to the drawing, wherein
- FIG. 1 is a cross sectional view through a preferred embodiment of the vacuum relief unit for mounting on a tanker; and
- FIG. 2 is an enlarged sectional view of FIG. 1.
- Albeit in the drawing the invention is shown as an integral part of a valve device that also comprises a vacuum relief device, the vacuum relief device according to the invention can obviously be configured as a unit that is built into a tanker separately from the pressure relief device.
- In the drawing, I is used to designate a preferably vertically oriented valve device with a
socket 4 that has, at its lower end, aflange 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. Thesocket 4 has alateral opening 6 to which avacuum relief unit 10 according to the invention is connected. Apressure relief unit 8 that is arranged above thelateral opening 6 will not be subject to more detailed description, as it does not form a part of the present invention. Thepressure relief device 8 can be for instance of the kind taught in U.S. Pat. No. 5,607,001. - As shown, the
vacuum relief unit 10 comprises avalve housing 20 that has, at its one end, a connectingpart 22, whereby thevalve housing 20 can—by means of conventional connecting means—be connected to thelateral opening 6, to a pressure equalisation tube or directly to a tank in a vessel. The connectingportion 22 defines afirst opening 12 of thevalve housing 20. - The
valve housing 20 also has asecond opening 24 in which avalve seat 30 is arranged that features aguide 32 for avalve bar 45. Thevalve seat 30 forms an abutment for avalve body 40 that carries saidvalve bar 45 and has, on the side that faces towards thevalve housing 20 interior, acentral area 42 withadjoining face portions 44. The internally and externally pressure-influenced surfaces, respectively, of thevalve body 40 that produce a movement away from and towards thevalve seat 30, respectively, has an area A3. - The
valve body 40 has a predetermined mass and may optionally be spring-biased. Hereby a certain abutment force Fl is obtained between thevalve body 40 and thevalve seat 30, whereby a given sealing of thesecond opening 24 can be ensured. It will be understood that, in case of a sub-atmospheric pressure in the tank, thevalve body 40 will be lifted away from its abutment on thevalve 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. - Underneath the valve seat30 a pushbutton-
like device 21 is also arranged that enables checking of the performance of thevacuum relief unit 10 during normal operation. - At the top, the
valve housing 10 has aflange 28 that delimits a third opening 26 in thevalve housing 10, and to which amechanism 100 is firmly bolted that may, as will be described more detailed below, be released automatically in case the ship sinks. Apart from that, the configuration of thevalve 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 abottom plate 110 that is intended for being secured in close abutment on theflange 28. Upwards from the bottom plate 110 a preferablycylindrical housing 120 extends that has anupper cover plate 130 withmounting apertures 134. Thehousing 120 is mounted in close abutment on thebottom plate 110 by means of a sealing means 116. The cover late 130 is secured to thebottom plate 110 by means of a number ofbar elements 140 that extend through themounting apertures 134 and are mounted inindentations 114 in thebottom plate 110. By means ofbolts 145 it is possible to remove thecover plate 130 to obtain access to the interior of themechanism 100. - Interiorly of the
housing 120, a first movable part is arranged in the form of apiston 160 that is firmly connected to a second movable part in the form of apiston rod 150 and has a surface area A1. Thehousing 120, thepiston 160 and thebottom plate 110 define between them aspace 102 that is preferably filled with air or other readily compressible gas. Thepiston rod 150 is displaceably journalled in a through-goingaperture 112 in thebottom plate 110, whereby the piston can be moved in the direction of the arrow P. Aspring 155 serves to bias thepiston 160 in a direction towards the starting position shown in FIGS. 1 and 2, where the top face of abolt 152 that serves to fixate thepiston rod 150 to thepiston 160 abuts on the underside of thecover plate 130. Along with thespring 155 the pressure Pc of the gas in thespace 102 will, to a certain extent, counteract a downward movement of thepiston 160. - In the embodiment shown 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 thepiston rod 150. The elasticity of the membrane may, in that case, be utilised to the effect that thespring 155 can be eliminated. - In the starting position shown, a
space 103 occurs between thecover plate 130 and the top face of thepiston 160, and thisspace 103 communicates with the exterior viaopenings 132 in the cover late 130. Above thecover plate 130 an open-mesh grid 105 or alike is preferably arranged that serves merely to prevent entry of insects or the like to themechanism 100. - As will appear, the
piston 160 is sealed relative to the inside of thehousing 120 by asealing means 165, and thepiston rod 150 is sealed relative to the interior of thevalve housing 20 by asealing mans 117. As will also appear, thepiston rod 150 has anend 152, whose surface area A2 is significantly smaller than the surface area A1 of thepiston 160. Saidend 152 enters in thevalve housing 20 interior immediately above thecentral area 42 of thevalve body 40, as will appear clearly from FIG. 1. It will be understood, that thepiston rod 150 and thevalve body 40 are preferably controlled such that theend 152 and thecentral area 42 move linearly towards each other by pressure influences on thepiston 160 and thevalve body 40, respectively. - The area A1 of the
piston 160, the length of thepiston rod 150, the spring force of thespring 155 and the resistance to themovement 160 of the piston due to the pressure Pc interiorly 102 of thehousing 120 is, in accordance with the invention, dimensioned such that theend 152 of thepiston rod 150 will, in case of usually prevailing sub-atmospheric pressure in the tank, move towards thecentral area 42 of thevalve body 20, but not so far that theend 152 arrives to abut on thecentral area 42 before thevalve body 40 has moved slightly away from thevalve seat 30 having allowed an equalisation of the difference in pressure. Following this pressure equalisation, thepiston 160 will move back to the starting position. - Such dimensioning must thus take into account the abutment force F1 between the
valve body 40 and thevalve seat 30. - In case of an accident where the ship is immersed a certain distance below sea level, seawater will flow into the
space 103 between thecover plate 130 and the top face of thepiston 160 and influence thepiston 160 with a downwardly oriented force corresponding to the hydrostatic pressure, whereby thepiston 160 is moved downwards. Theend 152 of thepiston rod 150 will reach thecentral area 42 of thepiston body 40 shortly after the hydrostatic pressure of the water has given rise to a movement of thevalve body 40 away from its abutment on thevalve seat 30. When the hydrostatic pressure increases due to the vessel being further immersed, theend 152 of thepiston rod 150 will move further into thevalve housing 20 and press thevalve body 40 back in abutment on thevalve seat 30. Hereby further inflow of seawater is avoided. - In order to take into account the accident scenario, dimensioning of the 10
mechanism 100 and thevalve body 40 must thus make sure that the above-described state can be brought about. In the show exemplary embodiment the following condition must thus be complied with: - (A 3×Py)−(A 3×Pi)+F 1=(A 1×Py+F 2)−(A 1×Pc+F 4)
- wherein
- Py is the hydrostatic pressure;
- Pi is the pressure within the tank;
- F2 is the force as a result of the mass of the
piston 160; and - F4 and Pc are the spring force and the pressure in the
interior 102 of the mechanism, respectively, when theend 152 of thepiston 160 is advanced towards the valve body. - Albeit in the drawing the
piston rod 150 is shown to be arranged immediately opposite thevalve body 40 and thus will move opposite the movement direction of thevalve body 40, obviously nothing prevents the mechanism from being arranged in any other manner, as long as thepiston rod 150 can, by its movement, cause thevalve body 40 to abut on thevalve seat 30.
Claims (7)
1. A vacuum relief unit for pressure equalisation between the ambient atmosphere and a tank in a tanker, wherein the vacuum relief unit comprises:
a valve housing (10) with a first opening (12), whereby the valve housing (10) is able to communicate with the tank, and a second opening (24) with a seat (30) for a valve body (40) that is configured for being conveyable into the valve housing (10) to permit inflow of air to the tank; and
a mechanism (100) configured for being able to prevent passage of seawater through the valve housing (10) in case of an accident, wherein the tanker is at least partially immersed into seawater, which mechanism (100) features
a first movable part (160) that is arranged outside the valve housing (10) and whose movement can be controlled by the liquid pressure of the sea water,
a second movable part (150) that can be advanced within the valve housing (10) and that is movably coupled to the first movable part (160),
characterised in that the second movable part (150) is configured for being conveyable to abut on the valve body (40) by an increasing movement of the first movable part (160) to cause the valve body (40) to return to its abutment on the seat (30).
2. A vacuum relief unit according to claim 1 , characterised in
that the valve body (40) is configured for being conveyed essentially linearly into the valve housing (20); and
that the second movable part is configured for being conveyed linearly into the valve housing (20) opposite this direction.
3. A vacuum relief unit according to claim 1 or 2, characterised in
that the valve housing (10) comprises a third opening (26); and
that the mechanism (100) comprises a housing (120) arranged in association with said opening (26).
4. A vacuum relief unit according to the preceding claim, characterised in
that the first movable part (160) is a piston and that the second movable part (150) is a piston rod that is firmly connected to the piston (160);
that the piston (160) and the housing (120) forms a sealed space (102);
that the piston (160) has a surface that is configured for being able to be influenced directly by said liquid pressure; and
that the piston rod (150) can be advanced into the valve housing (10) through said opening (26).
5. A vacuum relief unit according to the preceding claim, characterised in that the mechanism also comprises a spring (155) configured for providing a resistance to the movement of the piston (160).
6. A vacuum relief unit according to claim 4 or 5 characterised in that the housing (120) comprises a cover plate (130) provided with apertures (132), whereby the piston (160) can be influenced by said liquid pressure, and that the cover plate constitutes a limitation to the movement of the piston (160).
7. A vacuum relief unit according to any one of claims 36, characterised in that said third opening (26) is configured in a detachable wall portion (110) of the valve housing (20).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA200001919 | 2000-12-21 | ||
DK200001919A DK200001919A (en) | 2000-12-21 | 2000-12-21 | A valve |
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 |
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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 (en) |
EP (1) | EP1343680A1 (en) |
JP (1) | JP2004517771A (en) |
KR (1) | KR20040014439A (en) |
CN (1) | CN1489538A (en) |
CA (1) | CA2431923A1 (en) |
DK (1) | DK200001919A (en) |
NO (1) | NO20032847L (en) |
PL (1) | PL362460A1 (en) |
RU (1) | RU2003117798A (en) |
WO (1) | WO2002060751A1 (en) |
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JP5276611B2 (en) * | 2010-02-09 | 2013-08-28 | 三菱重工業株式会社 | Reliquefaction equipment mounted on a liquefied gas carrier |
KR101218668B1 (en) * | 2011-06-10 | 2013-01-04 | 탱크테크 (주) | High velocity pressure relief valve using lever principle |
JP5539282B2 (en) * | 2011-09-22 | 2014-07-02 | 新倉工業株式会社 | Relief valve |
CN103791232B (en) * | 2012-10-31 | 2015-08-19 | 江苏新天宝机械有限公司 | A kind of aseptic resuscitation apparatus |
CN103466054B (en) * | 2013-09-10 | 2016-07-13 | 上海羽翼船舶设备有限公司 | For subtracting the vacuum generating device shaking gyrorotor annular seal space |
CN110877657A (en) * | 2019-11-15 | 2020-03-13 | 沪东中华造船(集团)有限公司 | Safety protection method for chemical ship ballast tank |
CN112298458A (en) * | 2020-09-22 | 2021-02-02 | 沪东中华造船(集团)有限公司 | Pressure vacuum protection device of chemical ship with epoxy propane cargo hold and use method |
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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 |
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DK171445B1 (en) * | 1994-08-04 | 1996-10-28 | Soerensen Emil Aarestrup | Safety equipment for a tank having a system for collecting the gas expelled from the tank during loading |
-
2000
- 2000-12-21 DK DK200001919A patent/DK200001919A/en not_active Application Discontinuation
-
2001
- 2001-12-20 CN CNA018210945A patent/CN1489538A/en active Pending
- 2001-12-20 CA CA002431923A patent/CA2431923A1/en not_active Abandoned
- 2001-12-20 WO PCT/DK2001/000850 patent/WO2002060751A1/en not_active Application Discontinuation
- 2001-12-20 PL PL01362460A patent/PL362460A1/en not_active Application Discontinuation
- 2001-12-20 RU RU2003117798/11A patent/RU2003117798A/en not_active Application Discontinuation
- 2001-12-20 EP EP01273586A patent/EP1343680A1/en not_active Withdrawn
- 2001-12-20 US US10/450,383 patent/US20040065385A1/en not_active Abandoned
- 2001-12-20 KR KR10-2003-7008271A patent/KR20040014439A/en not_active Application Discontinuation
- 2001-12-20 JP JP2002560915A patent/JP2004517771A/en active Pending
-
2003
- 2003-06-20 NO NO20032847A patent/NO20032847L/en not_active Application Discontinuation
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Publication number | Priority date | Publication date | Assignee | Title |
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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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102748517A (en) * | 2011-04-22 | 2012-10-24 | 盐城中油船舶海洋工程科技有限公司 | Efficient cargo oil tank high-speed ventilation valve cover |
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 (en) * | 2020-09-22 | 2021-02-02 | 沪东中华造船(集团)有限公司 | Chemical ship with epoxy propane cargo hold, ventilation system and pressure safety valve locking device |
Also Published As
Publication number | Publication date |
---|---|
KR20040014439A (en) | 2004-02-14 |
NO20032847L (en) | 2003-08-20 |
WO2002060751A1 (en) | 2002-08-08 |
PL362460A1 (en) | 2004-11-02 |
NO20032847D0 (en) | 2003-06-20 |
CN1489538A (en) | 2004-04-14 |
EP1343680A1 (en) | 2003-09-17 |
CA2431923A1 (en) | 2002-08-08 |
JP2004517771A (en) | 2004-06-17 |
DK200001919A (en) | 2002-06-22 |
RU2003117798A (en) | 2004-12-20 |
WO2002060751A8 (en) | 2004-04-29 |
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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 |