Pressure gauge construction

Details Pressure gauge construction Pressure gauge construction

G - Physics

01

L

73/7

G01L 7/04 (2006.01)

Patent

CA 1131039

PRESSURE GAUGE CONSTRUCTION Abstract of the Disclosure Pointer zero adjustment in a pressure gauge is effected by means of a shaft (50) centrally extending laterally inward of the casing from a supportive centering flange (40) on the inside face of the crystal (10). A Bourdon tube (44) is radially coiled concealed from view through the crystal (10) about a pressure sealed rear por- tion of the shaft (50) to which it is rotationally secured. The pointer unit (42) is of a more or less U-shaped cross section with a tubular center (48) loosely supported on the shaft (50) juxtaposed to the crystal (10). The front pointer formation (42) simulates a conventional pointer appearance while its rear formation (52) is rotatably linked to the free end (56) of the Bourdon tube for in- curring operational displacement therewith. On removing a detachable cover (37) from over an aperture (34) in the crystal coincidingly located opposite the shaft end there- at, access is provided for an external tool (78) to opera- tionally engage a tool receiving hex socket (38) in the shaft end. Arcuately displacing the shaft (50) via the tool (78) calibrationally positions the pointer (42). By crystal (10) being of a composition and thickness afford- ing a spring rate of matched correlation to maximum antici- pated inlet pressure, the crystal provides a secondary function for relieving overpressure.

386541

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