G - Physics – 01 – L
Patent
G - Physics
01
L
73/125, 73/15
G01L 7/02 (2006.01) G01D 5/06 (2006.01) G01L 7/16 (2006.01) G01L 19/08 (2006.01)
Patent
CA 1205647
A B S T R A C T A PRESSURE TRANSDUCER A differential pressure gauge utilises a piston member provided with a series of grooves right around it, so that the piston member itself forms the rack of a rack-and-pinion device for converting linear displacement of the piston member into rotary displacement of the pinion. For sensitivity and accuracy, the seal between the piston member and the passage is a hard-surface-to-hard-surface engagement between substantial (total) hard surface areas at any one time of the passage and the piston member including regions of the surface area of the piston member intermediate mutually adjacent end ones of the grooves . In this way, the gauge is insensitive to the base pressure, there being no soft seals to deform under pressure. A magnetic coupling is used through the wall of the housing, which can thus be made completely pressure-tight. One embodiment indicates a reverse differential pressure by allowing the piston to travel beyond the normal end position upon overcoming the preload of a second spring.
448861
Fluid Devices Limited
Marks & Clerk
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