GB9005348D0 - A valve - Google Patents
A valveInfo
- Publication number
- GB9005348D0 GB9005348D0 GB9005348A GB9005348A GB9005348D0 GB 9005348 D0 GB9005348 D0 GB 9005348D0 GB 9005348 A GB9005348 A GB 9005348A GB 9005348 A GB9005348 A GB 9005348A GB 9005348 D0 GB9005348 D0 GB 9005348D0
- Authority
- GB
- United Kingdom
- Prior art keywords
- fluid
- piston
- fluid inlet
- cylinder
- working area
- 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.)
- Pending
Links
- 239000012530 fluid Substances 0.000 abstract 19
- 238000007789 sealing Methods 0.000 abstract 1
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Pulmonology (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Ocean & Marine Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Multiple-Way Valves (AREA)
- Fluid-Driven Valves (AREA)
Abstract
A valve (10) for controlling the flow of fluid from two alternative supplies in such a manner that reduction or cessation of one supply automatically causes the valve to switch to the other supply comprises a cylinder having a piston (26) slidable therein in a region between a first fluid inlet (17) and a second fluid inlet (20). The piston has working surfaces (27A, 27B, 28A) of differential area such that equal pressure on both sides of the piston biases the piston (26) to one end of the cylinder. The valve has a fluid outlet (16) from the valve, a first fluid flow path from the first fluid inlet to the fluid outlet, and a second fluid flow path from the second fluid inlet to the fluid outlet and including an axial outlet bore (29). The second fluid flow path is closable by an end (28) of the piston abutting against a seal (32) in the cylinder and is opened upon axial movement of the piston towards the first fluid inlet caused when the supply of fluid from the first fluid inlet fails, is arrested or falls below a predetermined limit. The first fluid flow path is closable by the other end (34) of the piston sealing abutting the cylinder. The first working area of the piston presents to the first fluid inlet, depending upon the axial position of the piston in the cylinder either a minor working area (27A) less than the second working area (28A) presented to the second fluid inlet or a major working area (27A, 27B) greater than the second working area (28A) presented to the second fluid inlet. Both fluid paths may include the piston axial bore (29) or they may be separate and parallel.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9005348A GB9005348D0 (en) | 1990-03-09 | 1990-03-09 | A valve |
PCT/GB1991/000376 WO1991014122A1 (en) | 1990-03-09 | 1991-03-08 | A valve |
AU73422/91A AU7342291A (en) | 1990-03-09 | 1991-03-08 | A valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9005348A GB9005348D0 (en) | 1990-03-09 | 1990-03-09 | A valve |
Publications (1)
Publication Number | Publication Date |
---|---|
GB9005348D0 true GB9005348D0 (en) | 1990-05-02 |
Family
ID=10672336
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9005348A Pending GB9005348D0 (en) | 1990-03-09 | 1990-03-09 | A valve |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU7342291A (en) |
GB (1) | GB9005348D0 (en) |
WO (1) | WO1991014122A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2286971B (en) * | 1994-01-18 | 1997-12-17 | Normalair Garrett | Check valve for breathing gas supply system |
US5542447A (en) * | 1994-01-18 | 1996-08-06 | Normalair-Garrett (Holdings) Limited | Aircrew breathing systems |
FR2905440B1 (en) * | 2006-09-06 | 2008-11-07 | Air Liquide | MAGNETIC CONTROL GAS DISTRIBUTION INVERTER |
SE543420C2 (en) * | 2019-08-02 | 2021-01-12 | Interspiro Ab | Arrangement for breathing apparatus, and breathing apparatus |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3008481A (en) * | 1959-05-22 | 1961-11-14 | George W Dahl Company Inc | Differential pressure selector |
US4281677A (en) * | 1979-11-16 | 1981-08-04 | The Bendix Corporation | Supply valve for dual circuit systems |
DE3529487C1 (en) * | 1985-08-16 | 1987-01-02 | Auergesellschaft Gmbh | Connection piece for the connection to an external compressed-air line of a compressed-air bottle carried by the wearer of the apparatus |
DE8816198U1 (en) * | 1988-12-30 | 1989-05-03 | Klaus Fischer Mess- Und Regeltechnik Gmbh & Co Kg, 4902 Bad Salzuflen, De |
-
1990
- 1990-03-09 GB GB9005348A patent/GB9005348D0/en active Pending
-
1991
- 1991-03-08 AU AU73422/91A patent/AU7342291A/en not_active Abandoned
- 1991-03-08 WO PCT/GB1991/000376 patent/WO1991014122A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
AU7342291A (en) | 1991-10-10 |
WO1991014122A1 (en) | 1991-09-19 |
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