30 15 45 0 60 30 15 45 0 60 30 15 45 0 60 30 15 45 0 60 PASCAL’S PRINCIPLE AS IT APPLIES TO BOURDON TUBE PERFORMANCE PASCAL’S PRINCIPLE "A change in pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and to the walls of its container." IF NO VOLUME CHANGES ON PRESSURIZATION Assuming the volume of a Bourdon tube does not change on pressurization, as per opinion of industry experts and Pascal’s Principle is valid, the illustrated Bourdon tubes can be pressurized to 45 PSIG by various combinations of force and fluid surface area where the force is applied. Two examples are illustrated. 1 POUND 45 POUND FORCE FORCE APPLIED APPLIED PLUNGER FACE AREA 1/45 IN² PLUNGER FACE AREA 1 IN² 45 PSIG 45 PSIG FLUID GAUGE FLUID GAUGE DEPRESSURIZED DEPRESSURIED PRESSURIZED PRESURIZED BOURDON TUBE BOURDON TUBE IF VOLUME CHANGES ON PRESSURIZATION Assuming the volume of a Bourdon tube does change on pressurization, contrary to opinion of industry experts and Pascal’s Principle is valid, the illustrated Bourdon tubes can be pressurized to 45 PSIG by various combinations of force and fluid surface area where the force is applied. Two examples are illustrated. This is valid if the displaced fluid volume, via the plunger, is greater than the volume change in the fluid when altering from depressurized to pressurized. 1 POUND 45 POUND FORCE FORCE APPLIED APPLIED PLUNGER FACE AREA 1/45 IN² PLUNGER FACE AREA 1 IN² 45 PSIG 45 PSIG GAUGE GAUGE FLUID FLUID DEPRESSURIZED DEPRESSURIED PRESSURIZED PRESURIZED BOURDON TUBE 12.217 BOURDON TUBE
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