F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/73, 116/77
F16K 37/00 (2006.01)
Patent
CA 1303434
- 19 - ABSTRACT A valve is disclosed which includes a first magnetic sensing means (71) and a closely positioned second magnetic sensing means (73). A valve shaft carries magnetic material (91) which is moved as the valve is opened or closed. The first magnetic sensing means (71) is magnetically held in one of its states when the valve is open, by the presence of the magnetic material (91). When the valve is closed the magnetic material (91) influences the second magnetic sensing means (73) and trips it into an alarm condition. The first magnetic sensing means (71) also trips into an alarm condition when the valve is closed. Thus, there is back-up sensing of the valve being closed. The second magnetic sensing means (73) also acts to provide an alarm if a person should maliciously attempt to fool the sensors by placing magnetic material near the first magnetic sensing means (71) to subsequently close the valve, without causing an alarm. When such magnetic material is brought into proximity of the first magnetic sensing means (71) it will cause the second magnetic sensing means (73) to trip into an alarm state. Sensing means fitted in a housing for attaching to a valve to provide this result is also disclosed.
534367
Magee Anthony James
Swabey Ogilvy Renault
LandOfFree
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