WO2002059509A2 - Safety valve - Google Patents
Safety valve Download PDFInfo
- Publication number
- WO2002059509A2 WO2002059509A2 PCT/IB2002/000233 IB0200233W WO02059509A2 WO 2002059509 A2 WO2002059509 A2 WO 2002059509A2 IB 0200233 W IB0200233 W IB 0200233W WO 02059509 A2 WO02059509 A2 WO 02059509A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chamber
- secondary chamber
- primary chamber
- safety valve
- primary
- Prior art date
Links
Classifications
-
- 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
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
Definitions
- THIS invention relates to a safety valve for pneumatic or hydraulic equipment.
- hoses Conventional pneumatic tools generally are connected to a source of compressed air by means of synthetic rubber hoses. These hoses often are composed of two or more lengths of hose which are joined together with steel couplings. Typically, each coupling is connected to two lengths of hose by inserting a pair of coupling components into the ends of the hoses and fastening the components within the hose ends with clamps, and elastomeric rings are arranged within the coupling components to form a seal between these components when they are connected together to form the coupling.
- the pressure inside the hose can cause the coupling components to separate, and if the coupling is not properly secured to the ends of the hoses the coupling components can be dislodged from the hose ends. Also, where the hose is exposed it can be cut or torn in use. Generally, if coupling components between two lengths of hose separate or if a length of hose is cut or torn, compressed air gushes out of the hose and causes it to thrash about uncontrollably, and this can lead to injuries for persons in the vicinity of the hose.
- a safety valve comprising:
- a housing which defines:
- a primary chamber having an inlet and an outlet
- the secondary chamber in fluid communication with the primary chamber, the secondary chamber having an inlet leading from the primary chamber to the secondary chamber and an outlet leading from the secondary chamber to the primary chamber;
- valve closure which is movable within the primary chamber between an open position in which it is located between the secondary chamber inlet and the secondary chamber outlet for allowing fluid to flow from the primary chamber to the secondary chamber through the secondary chamber inlet and from the secondary chamber to the primary chamber through the secondary chamber outlet, and a closed position in which it covers the secondary chamber outlet;
- biasing means for biasing the valve closure away from the closed position.
- the primary chamber extends along a central axis of the housing and the secondary chamber extends around at least a portion of the primary chamber.
- the primary chamber may be cylindrical in shape along at least a portion of its length and the secondary chamber may extend annularly around at least a portion of the length of the primary chamber.
- the secondary chamber inlet comprises a plurality of apertures leading from the primary chamber to the secondary chamber
- the secondary chamber outlet comprises a plurality of apertures leading from the secondary chamber to the primary chamber
- valve closure comprises a generally cylindrical body which is slidable along at least a portion of the primary chamber.
- the biasing means may comprise a coil spring which is fixed at one end relative to the housing and is fixed at the other end relative to the valve closure.
- the safety valve includes a mechanism for limiting the movement of the valve closure away from the closed position.
- the limiting mechanism comprises a collar around the coil spring which defines a rest position for the valve closure.
- the housing may be composed of two or more components which are detachable from one another so as to facilitate the cleaning and maintenance of the valve.
- the valve is formed from aluminium, stainless steel or brass.
- Figure 1 shows a cross-sectional view of a pneumatic safety valve according to the present invention in a rest condition
- Figure 2 shows a cross-sectional view similar to that of Figure 1 with the safety valve in an open condition
- Figure 3 shows a cross-sectional view of the pneumatic safety valve of the invention in a closed condition
- Figure 4 shows a cross-sectional view of a hydraulic safety valve according to the present invention.
- FIG. 1 of the drawings illustrates a pneumatic safety valve according to the present invention.
- the valve is designated generally with the reference numeral 10 and includes a housing 12 and a valve closure 14.
- the housing is composed of three components 12A, 12B and 12C which together define a primary chamber 16 and a secondary chamber 18.
- the component 12A includes an internal thread 20 which is arranged to engage an external thread 22 on the component 12C so that these components can be threadably connected to one another, and the component 12B is arranged to be sandwiched between the components 12A and 12C, as illustrated.
- the reference numerals 24 and 26 designate elastomeric O-rings which are arranged to from seals between the components 12A, 12B and 12C.
- An inlet 28 leading into the primary chamber 16 carries an internal thread 32 for attaching this end of the valve 10 to a conventional quick-release coupling (not shown) and an outlet 30 leading from the chamber 16 carries an internal thread 34 for attaching this end of the valve to a quick-release coupling (also not shown).
- a secondary chamber inlet in the form of a plurality of apertures 36 leads from the primary chamber 16 to the secondary chamber 18, and a secondary chamber outlet in the form of a plurality of apertures 38 leads from the secondary chamber to the primary chamber, as shown.
- the valve 10 is designed to operate at a pressure of 700 kPa and includes eight inlet apertures 36 of 4 mm diameter and eight outlet apertures 38 of 5 mm diameter. It will be appreciated though that for different operating pressures the number and/or sizes of the inlet and outlet apertures may vary according to the application.
- the valve closure 14 comprises a generally cylindrical body 40 which defines a cylindrical cavity 42 and an opening 44 in an end wall 46 thereof.
- a pin 48 carries a coil spring 50 which is attached at an opposite end to a pin 52.
- the pin 48 is fixed to the closure 14 and the pin 52 is connected to the component 12C so as to be fixed relative to the housing 12.
- a collar 54 extends around the spring 50, as illustrated, to define a rest position for the valve closure 14.
- valve 10 is connected to a synthetic rubber hose (not shown) leading to a pneumatic tool (also not shown) and is designed to regulate the flow of air from a source of compressed air (which is also not illustrated) to the tool.
- the inlet end of the housing 12 is attached to the source of compressed air via the quick-release coupling and the outlet side of the housing is attached to the synthetic rubber hose via the quick-release coupling.
- valve closure 14 In the event that a coupling on the hose is broken or the hose is cut or torn so that compressed air gushes out of the hose, the sudden drop in pressure on the outlet side of the valve 10 causes the valve closure 14 to be driven across the chamber 16 into a closed position as illustrated in Figure 3. In this position, the apertures 38 are closed off by the valve closure 14 so that only a nominal amount of air is allowed through the valve 10. This then serves to prevent compressed air from gushing out of the hose and the consequent thrashing about of the hose which can cause injuries for persons in the vicinity of the hose. When the supply of compressed air to the safety valve 10 is cut off, the valve closure 14 is drawn back into the Figure 1 position by the coil spring 50.
- FIG. 4 of the accompanying drawings illustrates a cross-sectional view of a hydraulic safety valve according to the present invention.
- the valve 110 is similar in many respects to the pneumatic safety valve 10 described above and accordingly like reference numerals have been used to designate like features. However, the valve 110 includes two modifications for operating with hydraulic fluid as opposed to with air.
- the first modification is an elastomeric O-ring 160 on the cylindrical body 40 which is arranged to form a seal between the valve closure 14 and the side wall of the chamber 16 as the valve closure slides within this chamber, in use.
- the second modification is an end wall 46 on the valve closure 14 which does not include an opening similar to the opening 44 in the valve closure of the first embodiment of the invention.
- the O-ring 160 and the omission of the opening 44 in the end wall 46 prevent hydraulic fluid from leaking from the valve 110 when the valve is in the closed condition.
- valve 110 is formed from stainless steel, but it will be appreciated that it could also be formed from various other materials, if desired.
- valve 110 is similar in all other respects to the valve 10 and operates in a similar manner to that described above with reference to the pneumatic safety valve.
- the components 12A, 12B and 12C can be detached from one another fairly easily, and that this facilitates the cleaning and maintenance of the valve by providing access to the inside of the chamber 18. It should also be appreciated that the valve 10 can be connected to and disconnected from an air line relatively easily and quickly.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Lift Valve (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002228268A AU2002228268A1 (en) | 2001-01-26 | 2002-01-28 | Safety valve |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA200100765 | 2001-01-26 | ||
ZA2001/0765 | 2001-01-26 | ||
ZA2001/3570 | 2001-05-03 | ||
ZA200103570A ZA200103570B (en) | 2001-01-26 | 2001-05-03 | Safety valve. |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002059509A2 true WO2002059509A2 (en) | 2002-08-01 |
WO2002059509A3 WO2002059509A3 (en) | 2002-12-19 |
Family
ID=27145551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2002/000233 WO2002059509A2 (en) | 2001-01-26 | 2002-01-28 | Safety valve |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2002228268A1 (en) |
WO (1) | WO2002059509A2 (en) |
ZA (1) | ZA200103570B (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2351335A1 (en) * | 1976-05-10 | 1977-12-09 | Clement Daniel | Pressure dependent flow limiting valve - has sliding plug which shuts off flow completely at preset max. rate |
EP0014277A1 (en) * | 1979-01-31 | 1980-08-20 | D S B Valves Limited | Fluid pressure-operated valves |
US4413643A (en) * | 1981-04-22 | 1983-11-08 | Regioninvest I Norr Ab | Hose-break valve |
US4605039A (en) * | 1984-10-04 | 1986-08-12 | Stewart-Warner Corporation | Runaway protective fuse valve |
DE3531175A1 (en) * | 1985-08-31 | 1987-03-12 | Gag Grubenausbau Gmbh | Shut-off valve |
WO1988010387A1 (en) * | 1987-06-17 | 1988-12-29 | Hiab-Foco Ab | Pressure drop hose valve |
US5687758A (en) * | 1995-05-22 | 1997-11-18 | Gas Guard West, Inc. | Gas leak sensor shutoff valve and method for installation |
-
2001
- 2001-05-03 ZA ZA200103570A patent/ZA200103570B/en unknown
-
2002
- 2002-01-28 AU AU2002228268A patent/AU2002228268A1/en not_active Abandoned
- 2002-01-28 WO PCT/IB2002/000233 patent/WO2002059509A2/en not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2351335A1 (en) * | 1976-05-10 | 1977-12-09 | Clement Daniel | Pressure dependent flow limiting valve - has sliding plug which shuts off flow completely at preset max. rate |
EP0014277A1 (en) * | 1979-01-31 | 1980-08-20 | D S B Valves Limited | Fluid pressure-operated valves |
US4413643A (en) * | 1981-04-22 | 1983-11-08 | Regioninvest I Norr Ab | Hose-break valve |
US4605039A (en) * | 1984-10-04 | 1986-08-12 | Stewart-Warner Corporation | Runaway protective fuse valve |
DE3531175A1 (en) * | 1985-08-31 | 1987-03-12 | Gag Grubenausbau Gmbh | Shut-off valve |
WO1988010387A1 (en) * | 1987-06-17 | 1988-12-29 | Hiab-Foco Ab | Pressure drop hose valve |
US5687758A (en) * | 1995-05-22 | 1997-11-18 | Gas Guard West, Inc. | Gas leak sensor shutoff valve and method for installation |
Also Published As
Publication number | Publication date |
---|---|
ZA200103570B (en) | 2001-11-12 |
WO2002059509A3 (en) | 2002-12-19 |
AU2002228268A1 (en) | 2002-08-06 |
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