CA3028776A1 - Apparatus for capping a cylinder valve - Google Patents

Apparatus for capping a cylinder valve

Info

Publication number
CA3028776A1
CA3028776A1 CA3028776A CA3028776A CA3028776A1 CA 3028776 A1 CA3028776 A1 CA 3028776A1 CA 3028776 A CA3028776 A CA 3028776A CA 3028776 A CA3028776 A CA 3028776A CA 3028776 A1 CA3028776 A1 CA 3028776A1
Authority
CA
Canada
Prior art keywords
emergency
valve
gas outlet
blocking screw
outlet
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.)
Granted
Application number
CA3028776A
Other languages
French (fr)
Other versions
CA3028776C (en
Inventor
Francois Gareau
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.)
Air Liquide Canada Inc
Original Assignee
Air Liquide Canada Inc
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 Air Liquide Canada Inc filed Critical Air Liquide Canada Inc
Priority to CA3028776A priority Critical patent/CA3028776C/en
Publication of CA3028776A1 publication Critical patent/CA3028776A1/en
Application granted granted Critical
Publication of CA3028776C publication Critical patent/CA3028776C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/06—Closures, e.g. cap, breakable member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0311—Closure means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0332—Safety valves or pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/23—Manufacturing of particular parts or at special locations
    • F17C2209/234—Manufacturing of particular parts or at special locations of closing end pieces, e.g. caps
    • F17C2209/236—Apparatus therefore
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/013—Carbone dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/035—High pressure (>10 bar)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/035—Dealing with losses of fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/048—Refurbishing

Abstract

An apparatus for capping a cylinder valve having an emergency gas outlet, including an emergency capping device body, with internal threads configured to accept an emergency gas outlet blocking screw, the emergency gas outlet blocking screw threaded into the emergency capping device body, the emergency gas outlet blocking screw including an end configured to removably attach to a blocking plug, and the blocking plug removably attached to the emergency gas outlet blocking screw, the blocking plug configured to seal and block the emergency gas outlet.

Description

l APPARATUS FOR CAPPING A CYLINDER VALVE
Background Most cylinders or manifolded cylinder packs are fitted with a relief device.
In a situation where excess pressure is encountered, this is designed to discharge cylinder contents either completely or only discharge the excess pressure. Discharge of a pressure relief device will be accompanied by a high-pitched noise and a jet of gas at high speed.
There are three types of commonly used pressure relief devices.
The burst disc is the most common. In the event of overpressure, this is designed to burst, leaving an open passage for gas contents to escape completely. For example, Carbon Dioxide (CO2) cylinders are typically fitted with a burst disc that operates at approximately 207 bar and is fitted on the cylinder valve.
A burst disc (or rupture disc) is a type of sacrificial part because it has a one-time-use membrane that fails at a predetermined differential pressure, either positive or vacuum. The membrane is usually made out of metal, but nearly any material (or different materials in layers) can be used to suit a particular application.
Rupture discs provide instant response (within milliseconds) to an increase or decrease in system pressure, but once the disc has ruptured, it will not reseal. It is not possible to set an accurate pressure value at which the disc will burst. Major advantages of the application of rupture discs compared to using pressure relief valves include leak-tightness and cost.
The next type of pressure relief device is the fusible plug. A fusible plug is a threaded metal cylinder, usually of bronze, brass, or gunmetal, with a tapered hole drilled completely through its length. This hole is sealed with a metal of low melting point that flows away if a pre-determined, high temperature is reached. A
typical application for the fusible plug is for tanks transporting corrosive gases.
For example, acetylene cylinders are typically fitted with fusible plugs that melt at approximately 100 C. The temperature rating of the fusible metal is stamped onto the face of the device.

i ,=
The last type of pressure relief device is the pressure relief valve. This type of , device might be used for LPG, A spring-loaded valve opens when the cylinder pressure . .=
exceeds the pressure setting of the spring to discharge contents. Once the cylinder pressure decreases to the valve's pressure setting, the valve will normally reseat without leakage.
Ordinarily, when such a non-resetting pressure relief valve fails, the contents of the cylinder are simply allowed to vent in situ. However, often this is not a desirable result, especially if the cause of the rupture is a fire in the immediate area and the cylinder contains an oxidant. Another consideration would be the cost of the lost gas.
There exists a need in the industry for a device to contain the gases within a cylinder with a venting pressure safety relief device.
Summary =
An apparatus for capping a cylinder valve having an emergency gas outlet, including an emergency capping device body, with internal threads configured to accept , an emergency gas outlet blocking screw, the _emergency gas outlet blocking screw , threaded into the emergency capping device body, the emergency gas outlet blocking screw including an end configured to removably attach to a blocking plug, and the blocking plug removably attached to the emergency gas outlet blocking screw, the blocking plug configured to seal and block the emergency gas outlet, In accordance with an aspect of the invention, there is provided an apparatus for capping a cylinder valve 101 comprising an emergency gas outlet 105, comprising:
= 6, an emergency capping device body 301 configured to be positioned around an existing valve body during an emergency overpressure condition, after the outlet line, tubing, or conduit from the valve body have been removed, = the emergency capping device body 301, with internal threads 310 configured to accept an emergency gas outlet blocking screw 305, = the emergency gas outlet blocking screw 305 threaded into the emergency capping device body 301, the emergency gas outlet blocking screw 305 .
comprising an end configured to removably attach to a blocking plug 306, and = .
the blocking ping 306 removably attached to the emergency gas outlet
2 O blocking screw 306, the blocking plug 306 configured to seal and block the emergency gas outlet 105, , wherein the existing valve body comprises a three port valve comprising an inlet port configured to attach to a gas cylinder, an outlet port configured to deliver regulated gas to a user, and an emergency gas outlet configured to relieve pressure during the emergency overpressure condition.
In accordance with another aspect there is provided:
O plug 306 is configured to accept at least one first connector 316, O emergency gas outlet blocking screw 305 comprises a locking groove 313 configured to receive the at least one first connector 316, and = plug 306 is removably attached to emergency gas outlet blocking screw 305 with the at least one first connector 316.
In accordance with another aspect the blocking plug 306 further comprises a guide 318.
In accordance with another aspect the guide 316 is configured to hold a sealing means 317, and wherein the sealing means 317 is configured to seal against the valve emergency outlet 105. .
In accordance with another aspect:
O plug 306 and guide 318 are configured to accept at least one two second connector 319, and O guide 318 is removably attached to plug 306 with the at least one two second connector 319.
In accordance with another aspect the emergency gas outlet blocking screw 306 comprises an actuator selected from the group consisting of a handwheel, a knob, as crank, or a speed ball handle 308.
In accordance with another aspect the cylinder valve further comprising a valve outlet 104, comprising:
O the emergency capping device .body 301 further comprising internal threads 309 configured to accept a valve cutlet blocking screw 302, and 2a * the valve outlet blocking screw 302 threaded into the emergency capping device body 301, the valve outlet blocking screw 302 comprising an end 303 , configured to block the valve outlet 104.
In accordance with another aspect the valve outlet blocking screw 302 comprises an actuator selected from the group consisting of a handwheel, a knob, a crank, or a speed ball handle 304.
Brief Description of the Drawings For a further understanding of the nature arid aspects for the present invention, reference should be made to the following detailed description, taken in conjunction with the accompanying drawings, in which like elements are given the same or analogous reference numbers and wherein:
Figure 1 is a schematic representation of typical medical gas valve with the pressure relief device intact.
Figure 2 is a schematic representation of a typical medical gas valve after an overpressure condition has been encountered, with the pressure relief device ruptured.
2b Figure 3 is a schematic representation of one embodiment of the present invention, in the unsealed position.
Figure 4 is a schematic representation of one embodiment of the present invention in the sealed position.
Figure 5 is another schematic representation of a valve with the pressure relief device intact.
Figure 6 is a schematic representation of a top view of an emergency capping device body in accordance with one embodiment of the present invention.
Figure 7 is a schematic representation of a side view of an emergency capping device body in accordance with one embodiment of the present invention.
Figure 8 is a schematic representation a valve outlet locking screw in accordance with one embodiment of the present invention Figure 9 is a schematic representation an emergency gas outlet blocking screw in accordance with one embodiment of the present invention Figure 10 is a schematic representation an emergency gas outlet blocking screw plug in accordance with one embodiment of the present invention Figure 11 is a schematic representation an emergency gas outlet sealing means in accordance with one embodiment of the present invention Figure 12 is a schematic representation an emergency gas outlet blocking screw plug assembly in accordance with one embodiment of the present invention Figure 13 is another schematic representation of one embodiment of the present invention, in the unsealed position.
Figure 14 is another schematic representation of one embodiment of the present invention in the sealed position.
Detailed Description of Preferred Embodiments Element Numbers 101 = valve body 102 = valve body internal passage 103 = valve body inlet 104 = valve body outlet
3 , , , The last type of pressure relief device is the pressure relief valve. This type of device might be used for LPG. A spring-loaded valve opens when the cylinder pressure exceeds the pressure setting of the spring to discharge contents. Once the cylinder pressure decreases to the valve's pressure setting, the valve will normally reseat without leakage.
Ordinarily, when such a non-resetting pressure relief valve fails, the contents of the cylinder are simply allowed to vent in situ. However, often this is not a desirable result, especially if the cause of the rupture is a fire in the immediate area and the cylinder contains an oxidant. Another consideration would be the cost of the lost gas.
There exists a need in the industry for a device to contain the gases within a cylinder with a venting pressure safety relief device.
Summary An apparatus for capping a cylinder valve having an emergency gas outlet, including an emergency capping device body, with internal threads configured to accept an emergency gas outlet blocking screw, the emergency gas outlet blocking screw threaded into the emergency capping device body, the emergency gas outlet blocking screw including an end configured to removably attach to a blocking plug, and the blocking plug removably attached to the emergency gas outlet blocking screw, the blocking plug configured to seal and block the emergency gas outlet.
Brief Description of the Drawings For a further understanding of the nature and aspects for the present invention, reference should be made to the following detailed description, taken in conjunction with the accompanying drawings, in which like elements are given the same or analogous reference numbers and wherein:
Figure 1 is a schematic representation of typical medical gas valve with the pressure relief device intact.
Figure 2 is a schematic representation of a typical medical gas valve after an overpressure condition has been encountered, with the pressure relief device ruptured.

Figure 3 is a schematic representation of one embodiment of the present invention, in the unsealed position.
Figure 4 is a schematic representation of one embodiment of the present invention in the sealed position.
Figure 5 is another schematic representation of a valve with the pressure relief device intact.
Figure 6 is a schematic representation of a top view of an emergency capping device body in accordance with one embodiment of the present invention.
Figure 7 is a schematic representation of a side view of an emergency capping device body in accordance with one embodiment of the present invention.
Figure 8 is a schematic representation a valve outlet locking screw in accordance with one embodiment of the present invention Figure 9 is a schematic representation an emergency gas outlet blocking screw in accordance with one embodiment of the present invention Figure 10 is a schematic representation an emergency gas outlet blocking screw plug in accordance with one embodiment of the present invention Figure 11 is a schematic representation an emergency gas outlet sealing means in accordance with one embodiment of the present invention Figure 12 is a schematic representation an emergency gas outlet blocking screw plug assembly in accordance with one embodiment of the present invention Figure 13 is another schematic representation of one embodiment of the present invention, in the unsealed position.
Figure 14 is another schematic representation of one embodiment of the present invention in the sealed position.
Detailed Description of Preferred Embodiments Element Numbers 101 = valve body 102 = valve body internal passage 103 = valve body inlet 104 = valve body outlet , 105 = valve emergency outlet 106 = pressure relief device (rupture disc or fusible plug) 107 = compressed gas inlet flow 108 = gas outlet flow 109 = emergency gas outlet flow 110 = medical gas cylinder 301 = emergency capping device body 302 = valve outlet blocking screw 303 = valve outlet blocking screw tapered end 304 = valve outlet blocking screw actuator (hand wheel) 305 = emergency gas outlet blocking screw 306 = emergency gas outlet blocking screw plug 307 = emergency gas outlet blocking screw plug cavity 308 = emergency gas outlet blocking screw actuator 309 = first internal thread (configured to receive valve outlet blocking screw) 310 = second internal thread (configured to receive emergency gas outlet blocking screw) 311 = device body wall 312 = device body valve body channel 313 = emergency gas outlet blocking screw locking groove 314 = emergency gas outlet blocking screw blunt end 315 = third internal thread (configured to receive emergency gas outlet blocking screw) 316 = first connector (roll pin, spring pin, screw, bolt, etc.) 317 = emergency gas outlet sealing means (crush gasket) 318 = guide (configured to mate with emergency gas outlet blocking screw plug) 319 = second connector (screw, rivet, etc.) 320 = sealing means holder All cryogenic liquids produce large volumes of gas when they vaporize. For example, one volume of liquid oxygen at atmospheric pressure vaporizes to 860
4 volumes of oxygen gas at 68 F (20 C). A cryogenic liquid cannot be indefinitely maintained as a liquid even in well-insulated containers. If these liquids are vaporized in a sealed container, they can produce enormous pressures that could rupture the container. For this reason, pressurized cryogenic containers are normally protected with multiple devices for over-pressure prevention. Common pressure-relief devices are a pressure-relief valve for primary protection and a rupture disc for secondary protection.
Medical gas cylinder valves have three ports when manufactured according to an industry standard (for example, the Compressed Gas Association (CGA) 870 or 540).
One port is screwed into the gas cylinder, a second port is where the regulator or gas delivery is attached, and the third port contains a pressure relief safety burst disc.
Pressure-relief devices are installed on most cylinders to prevent the rupture of a normally pressurized cylinder when it is inadvertently exposed to fire, high temperatures, or overfilling.
Turning to Figure 1, a schematic representation of typical medical gas valve is presented. The actuator mechanism and the details of the valve stem, seat, packing, etc. are not directly pertinent to the present invention, so these are not shown in detail in any of the instant drawings. Valve body 101 has a valve body inlet 103 that is typically attached to the medical gas cylinder 110, allowing compressed gas inlet flow 107 enter valve body internal passage 102. Under normal operating conditions, valve emergency outlet 105 is sealed, and no flow passes through pressure relief device 106.
Pressure relief device 106 may be a rupture disc, a fusible plug, a combination of the two, or any other non-resetting device known to the art. Again, under normal operating conditions, gas outlet flow 108 exits valve body outlet 104 under conditions controlled by the valve mechanism itself.
Turning to Figure 2, the same valve is schematically represented after an overpressure condition has been encountered. In this situation, pressure relief device 106 has failed, and emergency gas outlet flow 109 occurs. In this situation, gas outlet flow 108 will likely stop completely, as the gas will encounter less pressure drop through the now open valve emergency outlet 105. At this time, closing the valve itself will not stop the flow of gas from valve emergency outlet 105.

Turning to Figures 3 and 4, schematic representations of one embodiment of the present invention is provided. Emergency capping device body 301 is placed adjacent to valve body 101 and is partially surrounding it. Emergency capping device body 301 includes valve outlet blocking screw 302 and emergency gas outlet blocking screw 305.
Valve outlet blocking screw 302 may have a tapered end 303 that is configured contact valve body outlet 104 and block any flow. Emergency capping device body 301 has internal threads that are configured to engage with the external threads on valve outlet blocking screw 302, allowing valve outlet blocking screw tapered end 303 to be moved toward or away from valve body outlet 104 by the use of valve outlet blocking screw actuator 304. Valve outlet blocking screw actuator 304 may be a knob, a handwheel, a crank, a speed ball handle, or any type of manual actuator known to the art.
Valve outlet blocking screw actuator 304 may be a pneumatic, hydraulic, or any other actuator type known to the art.
Emergency gas outlet blocking screw 305 has a plug 306 that is configured contact valve emergency outlet 105 and block any flow. Plug 306 may, for example, have a cavity 307 into which valve emergency outlet is contained. Emergency capping device body 301 has internal threads that are configured to engage with the external threads on emergency gas outlet blocking screw 305, allowing plug 306 to be moved toward or away from valve emergency outlet by the use of emergency gas outlet blocking screw actuator 308. Emergency gas outlet blocking screw actuator 304 may be a knob, a handwheel, a crank, a speed ball handle, or any type of manual actuator known to the art. Emergency gas outlet blocking screw actuator 304 may be a pneumatic, hydraulic, or any other actuator type known to the art.
Turning to Figure 5, another schematic representation of a medical gas valve in accordance with one embodiment of the present invention is presented. The actuator mechanism and the details of the valve stem, seat, packing, etc. are not directly pertinent to the present invention, so these are not shown in detail in any of the instant drawings. Valve body 101 has a valve body inlet 103 that is typically attached to the medical gas cylinder (not shown). Under normal operating conditions, valve emergency outlet 105 is sealed, and no flow passes through pressure relief device 106 (which is internal in this embodiment and thus not explicitly represented). Pressure relief device 106 may be a rupture disc, a fusible plug, a combination of the two, or any other non-resetting device known to the art. Again, under normal operating conditions, gas outlet flow 108 exits valve body outlet 104 under conditions controlled by the valve mechanism itself.
Turning to Figures 6 and 7, another schematic representation of an emergency capping device body 301 in accordance with one embodiment of the present invention is presented. Emergency capping device body 301 has first internal threads 309 that are configured to engage with the external threads on valve outlet blocking screw 302.
Emergency capping device body 301 has second internal threads 310 that are configured to engage with the external threads on emergency gas outlet blocking screw 305. Emergency capping device body 301 has device body valve body channels 312 that are configured to accommodate valve body 101. As illustrated in Figure 7, emergency capping device body 301 has a device body wall 311 that defines the rear boundary of device body valve body channels 312.
Turning to Figure 8, a schematic representation of one embodiment of valve outlet blocking screw 302 is provided. Valve outlet blocking screw 302 may have a tapered end 303 that is configured contact valve body outlet 104 and block any flow.
Other means of blocking the outlet flow of valve body outlet 104 that are known to the art may be used. Emergency capping device body 301 has internal threads that are configured to engage with the external threads on valve outlet blocking screw 302, allowing valve outlet blocking screw tapered end 303 to be moved toward or away from valve body outlet 104 by the use of valve outlet blocking screw actuator 304.
Valve outlet blocking screw actuator 304 may be a knob, a handwheel, a crank, a speed ball handle, or any type of manual actuator known to the art. Valve outlet blocking screw actuator 304 may be a pneumatic, hydraulic, or any other actuator type known to the art.
Turning to Figure 9, a schematic representation of one embodiment of emergency gas outlet blocking screw 305 is provided. Emergency gas outlet blocking screw 305 may have a segment on the end that is unthreaded. The unthreaded portion may include a locking groove 313 that is configured to receive one or more first connector pins 316 (below). The unthreaded portion may also include a blunt end 314 that is configured to nestle into a receiving pocket in emergency gas outlet blocking screw plug 306 (below). Emergency capping device body 301 has internal threads that are configured to engage with the external threads on emergency gas outlet blocking screw 305, allowing blunt end 304 to be moved toward or away from valve emergency outlet 105 by the use of emergency gas outlet blocking screw actuator 308.
Emergency gas outlet blocking screw actuator 308 may be a knob, a handwheel, a crank, a speed ball handle, or any type of manual actuator known to the art. Emergency gas outlet blocking screw actuator 308 may be a pneumatic, hydraulic, or any other actuator type known to the art.
Turning to Figure 10, a schematic representation of one embodiment of emergency gas outlet blocking screw plug 306 is provided. In one embodiment, plug 306 has a cavity 307 that is configured to fit over and around valve emergency outlet 105, thereby stopping the flow. Plug 306 has an internal passageway 315 configured to receive emergency gas outlet blocking screw rounded end 315. Plug 306 has one or more holes that are sized and located to accommodate first connector pins 316, which then engage locking groove 313. Plug 306 has at least two holes that are sized and located to accommodate second connectors 319, which then engage guide 318 (below).
Turning to Figure 11, a schematic representation of emergency gas outlet sealing means 317 is provided. Sealing means 317 locking groove 313 may be a gasket, a crush gasket, an o-ring, or any sealing means known to the art.
Turning to Figure 12, a schematic representation of the emergency gas outlet blocking screw plug assembly is provided. Guide 318 is attached to plug 306 by means of second connectors 319. Second connectors 319 may be screws, rivets, bolts, or any connecting means known to the art. Guide 318 has sealing means holder 320 that allows sealing means 317 to be properly located on the face of plug 306 and ultimately deposited on device valve body 101, around valve emergency outlet 105. Guide 318 is held in place on both sides of plug 306, by means of second connectors 319.
Second connectors 319 may be screws, rivets, bolts, or any suitable means known in the art.
Turning to Figure 13, a schematic representation of one embodiment of the present invention is provided. The actuator mechanism and the details of the valve stem, seat, packing, etc. are not directly pertinent to the present invention, so these are not shown in detail in any of the instant drawings. Valve body 101 has a valve body inlet 103 that is typically attached to the medical gas cylinder (not shown).
Under normal operating conditions, valve emergency outlet 105 is sealed, and no flow passes through pressure relief device (internal to valve emergency outlet 105 and not shown in this figure). The pressure relief device may be a rupture disc, a fusible plug, a combination of the two, or any other non-resetting device known to the art.
Again, under normal operating conditions, gas exits valve body outlet 104 under conditions controlled by the valve mechanism itself.
Emergency capping device body 301 is placed adjacent to valve body 101 and is partially surrounding it. Emergency capping device body 301 has first internal threads 309 that are configured to engage with the external threads on valve outlet blocking screw 302 (below). Emergency capping device body 301 has second internal threads 310 that are configured to engage with the external threads on emergency gas outlet blocking screw 305 (below). Emergency capping device body 301 has device body valve body channels 312 that are configured to accommodate valve body 101.
Emergency capping device body 301 includes valve outlet blocking screw 302 and emergency gas outlet blocking screw 305. Valve outlet blocking screw 302 may have a tapered end 303 that is configured contact valve body outlet 104 and block any flow. Emergency capping device body 301 has internal threads that are configured to engage with the external threads on valve outlet blocking screw 302, allowing valve outlet blocking screw tapered end 303 to be moved toward or away from valve body outlet 104 by the use of valve outlet blocking screw actuator 304. Valve outlet blocking screw actuator 304 may be a knob, a handwheel, a crank, a speed ball handle, or any type of manual actuator known to the art. Valve outlet blocking screw actuator 304 may be a pneumatic, hydraulic, or any other actuator type known to the art. When emergency capping device body 301 is in the proper position valve outlet blocking screw 302 is aligned with valve body outlet 104, and emergency gas outlet blocking screw 305 is aligned with valve emergency outlet 105.
Emergency gas outlet blocking screw 305 has a plug 306 that is configured contact valve emergency outlet 105 and block any flow. In one embodiment, plug has a cavity 307 that is configured to fit over and around valve emergency outlet 105, thereby stopping the flow. Plug 306 has an internal passageway 315 configured to receive emergency gas outlet blocking screw rounded end 315. Plug 306 has one or more holes that are sized and located to accommodate first connector pins 316, which then engage locking groove 313. Plug 306 has at least two holes that are sized and located to accommodate second connectors 319, which then engage guide 318 (below).
Sealing means 317 locking groove 313 may be a gasket, a crush gasket, an o-ring, or any sealing means known to the art.
Guide 318 is attached to plug 306 by means of second connectors 319. Second connectors 319 may be screws, rivets, bolts, or any connecting means known to the art.
Guide 318 has sealing means holder 320 that allows sealing means 317 to be properly located on the face of plug 306 and ultimately deposited on device valve body 101, around valve emergency outlet 105. Guide 318 is held in place on both sides of plug 306, by means of second connectors 319. Second connectors 319 may be screws, rivets, bolts, or any suitable means known in the art.
Emergency capping device body 301 has internal threads that are configured to engage with the external threads on emergency gas outlet blocking screw 305, allowing plug 306 to be moved toward or away from valve emergency outlet by the use of emergency gas outlet blocking screw actuator 308. Emergency gas outlet blocking screw 305 may have a segment on the end that is unthreaded. The unthreaded portion may include a locking groove 313 that is configured to receive one or more first connector pins 316 (below). The unthreaded portion may also include a blunt end 314 that is configured to nestle into a receiving pocket in emergency gas outlet blocking screw plug 306 (below). Emergency capping device body 301 has internal threads that are configured to engage with the external threads on emergency gas outlet blocking screw 305, allowing blunt end 304 to be moved toward or away from valve emergency outlet 105 by the use of emergency gas outlet blocking screw actuator 308.
Emergency gas outlet blocking screw actuator 308 may be a knob, a handwheel, a crank, a speed ball handle, or any type of manual actuator known to the art. Emergency gas outlet blocking screw actuator 308 may be a pneumatic, hydraulic, or any other actuator type known to the art.

i , Turning to Figure 13, one embodiment of the present method is provided. Valve 101 is attached to a cylinder of compressed gas (not shown). An overpressure condition is encountered, and the pressure relief device (internal to valve emergency outlet 105, and not shown in this figure, but clearly indicated in prior figures) ruptures or otherwise activates in order to relieve the pressure. Most, if not all, of the gas flow that had been exiting through valve body outlet 104 stops, and most, if not all, of the gas now exits through valve emergency outlet 105.
The operator responds by removing the outlet line, tubing, or conduit from valve body outlet 104, and placing emergency capping device body 301 around valve body 101. When emergency capping device body 301 is in the proper position valve outlet blocking screw 302 is aligned with valve body outlet 104, and emergency gas outlet blocking screw 305 is aligned with valve emergency outlet 105.
Emergency capping device body 301 will have valve outlet blocking screw 302 threaded into first internal thread 309, and emergency gas outlet screw 305 threaded into second internal thread 309. Plug assembly, which includes guide 318 attached to two sides of plug 306 by means of second connector 319, will have emergency gas outlet sealing means 317 securely in place. Plug assembly will be attached to the unthreaded end of emergency gas outlet screw 305, with the first connectors holding plug 306 in place by way of emergency gas outlet blocking screw locking groove 313.
The operator then rotates valve outlet blocking screw actuator 304, thereby moving valve outlet blocking screw tapered end 303 toward valve body outlet 104. The ultimate blocking position for valve outlet blocking screw tapered end is indicated in Figure 14. In this position, gas flow from valve body outlet 104 will cease.
The operator then rotates emergency gas outlet blocking screw actuator 308, thereby moving plug 306 toward valve emergency outlet 105. The ultimate blocking position for valve outlet blocking screw tapered end is indicated in Figure 14. In this position, gas flow from valve emergency outlet 105 will cease.
It will be understood that many additional changes in the details, materials, steps and arrangement of parts, which have been herein described in order to explain the , nature of the invention, may be made by those skilled in the art within the principle and scope of the invention as expressed in the appended claims. Thus, the present invention is not intended to be limited to the specific embodiments in the examples given above.

Claims (8)

What is claimed is:
1. An apparatus for capping a cylinder valve 101 comprising an emergency gas outlet 105, comprising:
.cndot. an emergency capping device body 301 configured to be positioned around an existing valve body during an emergency overpressure condition, after the outlet line, tubing, or conduit from the valve body have been removed, .cndot. the emergency capping device body 301, with intemal threads 310 configured to accept an emergency gas outlet blocking screw 306 , a the emergency gas outlet blocking screw 305 threaded into the emergency capping device body 301, the emergency gas outlet blocking screw 305 comprising an end configured to removably attach to a blocking plug 306, and the blocking plug 306 removably attached to the emergency gas outlet blocking screw 305, the blocking plug 306 configured to seal and block the emergency gas outlet 105, wherein the existing valve body comprises a three port valve comprising an inlet port configured to attach to a gas cylinder, an outlet port configured to deliver regulated gas to a user, and an emergency gas outlet configured to relieve pressure during the emergency over pressure condition.
2. The apparatus of claim 1, wherein:
.cndot. plug 306 is configured to accept at least one first connector 316, .cndot. emergency gas outlet blocking screw 305 comprises a locking groove configured to receive the at least one first connector 316, and a plug 306 is removably attached to emergency gas outlet blocking screw 305 with the at least one first connector 316.
3. The apparatus of claim 1, wherein the blocking plug 306 further comprises a guide 316.
4. The apparatus of claim 3, wherein the guide 318 is configured to hold a sealing means 317, and wherein the sealing means 317 is configured to seal against the valve emergency outlet 105
5. The apparatus of claim 3, wherein:
.cndot. plug 306 and guide 318 are configured to accept at least one two second connector 319, and .cndot. guide 318 is removably attached to plug 306 with the at least one two second connector 319.
6 The apparatus of claim 1, wherein the emergency gas outlet blocking screw comprises an actuator selected from the group consisting of a handwheel, a knob, a crank, or a speed ball handle 308.
7. An apparatus of claim 1, the cylinder valve further comprising a valve outlet 104, comprising .cndot.the emergency capping device body 301 further comprising intemal threads 309 configured to accept a valve outlet blocking screw 302, and e the valve outlet blocking screw 302 threaded into the emergency capping device body 301, the valve outlet blocking screw 302 comprising an end 303 configured to block the valve outlet 104
8. The apparatus of claim 7, wherein the valve outlet blocking screw 302 comprises an actuator selected from the group consisting of a handwheel, a knob, a crank, or a speed ball handle 304.
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