AU7009694A - 501 gas safety stem - Google Patents

501 gas safety stem

Info

Publication number
AU7009694A
AU7009694A AU70096/94A AU7009694A AU7009694A AU 7009694 A AU7009694 A AU 7009694A AU 70096/94 A AU70096/94 A AU 70096/94A AU 7009694 A AU7009694 A AU 7009694A AU 7009694 A AU7009694 A AU 7009694A
Authority
AU
Australia
Prior art keywords
safety
cylinder
stem
gas
regulator
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
AU70096/94A
Other versions
AU693794B2 (en
Inventor
Lee Louis Schatz
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.)
MULTIGAS WELDING SERVICES Ltd
Original Assignee
MULTIGAS WELDING SERVICES Ltd
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 MULTIGAS WELDING SERVICES Ltd filed Critical MULTIGAS WELDING SERVICES Ltd
Publication of AU7009694A publication Critical patent/AU7009694A/en
Application granted granted Critical
Publication of AU693794B2 publication Critical patent/AU693794B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/40—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint
    • F16K17/406—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint the fracturing member being a generally elongated member, e.g. rod or wire, which is directly connected to a movable valve member, the breaking or buckling of the elongated member allowing the valve member to move to a closed or open position
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L35/00—Special arrangements used in connection with end fittings of hoses, e.g. safety or protecting devices
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10—Means for stopping flow from or in pipes or hoses
    • F16L55/1015—Couplings closed automatically when disengaging force exceeds preselected value
    • 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
    • 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
    • F17C2205/0338—Pressure regulators
    • 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
    • F17C2205/0388—Arrangement of valves, regulators, filters
    • F17C2205/0394—Arrangement of valves, regulators, filters in direct contact with the pressure vessel
    • 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
    • F17C2260/036—Avoiding leaks
    • 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
    • F17C2260/042—Reducing risk of explosion

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Description

501 GAS SAFETY STEM
Technical Field
The invention relates to a gas safety stem and more particularly to a safety stem for a gas regulator, incorporating a safety valve.
Background of Invention
High pressure gas cylinders are often used in industry and elsewhere. They can however be dangerous and lead to industrial accidents. For example, if an accident occurs and the regulator is smashed off the cylinder (for example, the cylinder may fall over) , the cylinder becomes a missile due to the escaping gas. Also there is a risk of explosion from the gas.
In addition to the problem of an industrial accident, if the regulator is knocked off the cylinder, there is the problem of loss of potentially expensive gas.
Disclosure of the Invention
It is an object of the invention to go at least some way to overcoming or at least reducing these disadvantages or to at least provide the public with a useful choice.
The invention provides a safety stem adapted to be attached directly or indirectly between a gas cylinder and a regulator of the gas cylinder, the safety stem adapted to shut off a flow of gas from the cylinder to the regulator when the regulator is smashed off the cylinder, regardless of the pressure differential between the cylinder interior and the external atmosphere.
Preferably the safety stem comprises a retaining means adapted to prevent a safety valve from closing when the cylinder is in its normal position prior to an accident.
SUBSTITUTE SHEET Preferably, on release of the retaining means, the safety valve is forced shut thus preventing gas escaping from the cylinder to the outside atmosphere.
Preferably, in its normal position, prior to an accident, the retaining means compresses a biasing means and on release of the retaining means, the biasing means is also released and expands to force the safety valve shut.
The biasing means is preferably a spring.
The safety valve may comprise a ball and socket with a channel for gas flow extending from the socket, and wherein the ball, on the release of the biasing means is adapted to be forced into the socket thus sealing the channel and preventing gas flow therethrough from the cylinder to the external atmosphere. The retaining means may be a retaining pin adapted to lie along the length of the channel between a stop at the external end of the safety stem and the safety valve.
A stop may retain the retaining pin in the channel, forcing the retaining pin to compress the biasing means in the normal position.
Preferably the retaining means comprises a break point such that on breakage of the retaining means at the break point, the retaining means is released from the safety stem, which in turn releases the biasing means which in turn forces the safety valve closed, preventing gas flow from the cylinder into the channel.
A nut may be positioned between the safety valve and the biasing means.
Preferably the safety stem comprises fixing means to secure it to a regulator and/or a cylinder, and/or a cylinder valve. The invention also provides a regulator comprising a safety stem as defined above. The invention also provides a method of preventing escape of gas from a gas cylinder in the event of an accident occurring which removes a regulator from the gas cylinder.
Brief Description of Drawings
The invention will be described, by way of example only, with reference to the drawing in which:
Figure 1 is a cross sectional side view of the safety stem.
Best Mode of Carrying Out the Invention
Referring to figure 1, the safety stem is shown generally at 2. The soft seat 4 is designed to attach to a cylinder valve (not shown) which in turn is designed to attach to a cylinder of gas (not shown) .
A stainless steal spring 6 is coiled in a cavity 7 between the safety seat 4 and a first side of a small brass nut 8. On the opposite side of the brass nut 8 is a stainless steel ball 10. The stainless steel ball 10 sits between the brass nut 8 and a valve seat 12. The valve seat 12 extends from the brass nut 8 into a long, narrow channel 14. The neck of the valve seat 12 is narrower at the point at which it extends into the channel 14. The channel 14 extends towards a regulator (not shown), terminating in a stainless steel filter 16.
Extending through the channel 14 is a brass retaining pin 18. The first end of the retaining pin 18, that is the end nearest the soft seat 4, sits against the steel ball 10. Approximately midway along the retaining pin 18 is a safety break point 20.
Around the outside of the safety stem 2 are attachment means such as screw threads 22 designed to secure the safety stem 2 to the cylinder valve (not shown) and the regulator (not shown) .
Also provided is a bullnose nut 24.
In use, gas enters from a cylinder (not shown) through a cylinder valve (not shown) and into the safety stem 2 via the soft seat 4. In its normal position, prior to an accident, the stainless steel spring 6 is compressed. Hence gas is able to flow through the cavity 7 in the safety stem 2, around the stainless steel ball 10 and through the channel 14 to the outside. The stainless steel ball 10 is prevented from pushing against the valve seat 12 and blocking the channel 14 by the brass retaining pin 18 which exerts a backwards pressure on the stainless steel ball 10. This backwards pressure is exerted via the brass nut 8 onto the stainless steel spring 6, thus maintaining the stainless steel spring 6 in a coiled position.
In the event of an accident, if the regulator falls off (for example, due to the cylinder falling over), the safety break point 20 breaks. This releases the stainless steel spring 6 which in turn forces the stainless steel ball up against the valve seat 12. Due to the tunnel shape of the valve seat 12, gas cannot pass around the ball 10 into the channel 14. Thus the flow of gas from the cylinder is shut off.
Due to the compression of the spring 6, the safety stem 2 is shut off regardless of the pressure, ie the safety stem needs no pressure differential to work. The safety stem 2 works by using the compression in the spring 6 to force the valve seat 12 shut. It will Joe appreciated that the invention is not limited to the described embodiment and that numerous modifications and variations may be made to the described embodiment without departing from the scope of the invention as set out in the claims.
For example, the safety stem 2 need not be adapted to sit between the regulator and the cylinder valve. The safety stem 2 could be used on the opposite side of the cylinder valve, that is, between the cylinder valve and the cylinder itself.
It will also be appreciated that the components of the safety stem 2 may be made out of any suitable material, and are not restricted to stainless steel and brass.
It will be appreciated that the safety stem has numerous advantages. For example, in the event of an accident smashing off the regulator from a gas cylinder, it:
i) stops the cylinder from becoming a missile;
ii) reduces the risk of explosion from the gas;
iii) minimises the loss of expensive gas for companies where economy is important.
Industrial Applicabilit
The safety stem according to the invention will find wide use in industry were gas cylinders are used. Use of the safety stem will help prevent industrial accidents.

Claims (12)

CLAIMS :
1. A safety stem adapted to be attached directly or indirectly between a gas cylinder and a regulator of the gas cylinder, the safety stem adapted to shut off a flow of gas from the cylinder to the regulator when the regulator is smashed off the cylinder, regardless of the pressure differential between the cylinder interior and the external atmosphere.
2. A safety stem as claimed in claim 1 in which a retaining means prevents a safety valve from closing when the cylinder is in its normal position prior to an accident and whereby, on release of the retaining means, the safety valve is forced shut, thus preventing gas escaping from the cylinder to the outside atmosphere.
3. A safety stem as claimed in claim 2 in which in its normal position, prior to an accident, the retaining means compresses a biasing means and on release of the retaining means, the biasing means is also released and expands to force the safety valve shut.
4. A safety stem as claimed in claim 3 in which the biasing means is a spring.
5. A safety stem as claimed in either of claims 3 and 4 in which the safety valve comprises a ball and socket and in which a channel for gas flow extends from the socket to the exterior of the stem and wherein the ball, on release of the biasing means is adapted to be forced into the socket, thus sealing the channel and preventing gas flow therethrough from the cylinder to the external atmosphere.
6. A safety stem as claimed in any one of claims 3 to 5 in which a stop maintains the retaining pin in the channel when the safety stem is in the normal position and wherein the stop forces the retaining pin to compress the biasing means in the normal position.
7. A safety stem as claimed in any one of claims 3 to 6 in which the retaining means comprises a break point such that on breakage of the retaining means at the break point, the retaining means is released from the safety stem which in term releases the biasing means which in term forces the safety valve closed, thus preventing gas flow from the cylinder to the external atmosphere.
8. A safety stem as claimed in any one of claims 3 to 7 in which a nut is positioned between the safety valve and the biasing means.
9. A safety stem as claimed in any one of claims 1 to 8 in which fixing means are provided on the outside of the stem to secure the safety stem to a regulator and/or a cylinder and/or a cylinder valve.
10. A regulator for a gas cylinder comprising a safety stem as claimed in any one of claims 1 to 9.
11. A method of preventing escape of gas from a gas cylinder to the external atmosphere in the event of an accident occurring which removes a regulator from the gas cylinder, comprising attaching a safety stem as claimed in any one of claims 1 to 9 between the gas cylinder and the regulator.
12. A safety stem substantially as described in this specification with reference to figure 1.
AU70096/94A 1994-06-13 1994-06-13 501 gas safety stem Ceased AU693794B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NZ1994/000059 WO1995034777A1 (en) 1994-06-13 1994-06-13 501 gas safety stem

Publications (2)

Publication Number Publication Date
AU7009694A true AU7009694A (en) 1996-01-05
AU693794B2 AU693794B2 (en) 1998-07-09

Family

ID=19916321

Family Applications (1)

Application Number Title Priority Date Filing Date
AU70096/94A Ceased AU693794B2 (en) 1994-06-13 1994-06-13 501 gas safety stem

Country Status (2)

Country Link
AU (1) AU693794B2 (en)
WO (1) WO1995034777A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWM310982U (en) * 2006-12-13 2007-05-01 Yi-Jr Bai Security protection structure of high-pressure gas connector
IT1400490B1 (en) * 2010-05-28 2013-06-11 Helite S A R L DEVICE FOR INFLATING AIRBAGS
JP6408781B2 (en) * 2013-11-20 2018-10-17 矢崎エナジーシステム株式会社 Gas leak suppression adapter
CN112066056B (en) * 2020-07-31 2021-07-16 清华大学 Safety cut-off valve

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3630214A (en) * 1970-01-02 1971-12-28 Aeroquip Corp Frangible coupling
US3665946A (en) * 1970-08-10 1972-05-30 Milwaukee Valve Co Inc Tank truck safety valve
US3874428A (en) * 1973-08-08 1975-04-01 Charles R Golay Remote fill system for L-P gas cylinder
US3916929A (en) * 1974-08-16 1975-11-04 Scovill Manufacturing Co Self-sealing break-away fitting
US4077422A (en) * 1975-11-17 1978-03-07 Said Robie G. Brinkley, By Said Gerry D. Welton Flow control means for compressed gas cylinders
US4064889A (en) * 1976-02-17 1977-12-27 Sun Oil Company Of Pennsylvania Break-away safety valve
US4562852A (en) * 1984-08-20 1986-01-07 Britt Franklin J Safety valve
US4762140A (en) * 1987-05-28 1988-08-09 Davis Edward A Snap-off plug valve
CH672669A5 (en) * 1987-06-04 1989-12-15 Felix Buechel Gas safety valve for pressurised gas canisters - consists of housing with guide piece for pin, with piston
US4886087A (en) * 1988-09-19 1989-12-12 Garret Kitchen Fuel spill prevention valve

Also Published As

Publication number Publication date
WO1995034777A1 (en) 1995-12-21
AU693794B2 (en) 1998-07-09

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Legal Events

Date Code Title Description
MK14 Patent ceased section 143(a) (annual fees not paid) or expired