Multicoil bourdon tube type pressure gauge

Abstract

A multicoil tube type pressure gauge arranged for direct drive of the gauge pointer and for safely handling overpressure in the event of Bourdon tube rupture comprising a casing of round configuration defining a planar upright main chamber, with the casing being indented rearwardly adjacent the axial center of the gauge to define a supplemental chamber, a mounting plate that is common to all the working parts of the gauge secured to the gauge casing over the supplemental chamber and mounting cantilever fashion a tubular spool journaling the gauge pointer shaft, a multicoil Bourdon tube encircling the spool having its sealed end secured to the shaft within the supplemental chamber, and a pressure connection fitting in the form of a connection block anchored to the mounting plate and having a pressure cavity to which the Bourdon tube other end is sealingly secured with its bore in communication with the fitting pressure cavity, with the Bourdon tube direct driving the gauge pointer shaft; the working parts of the gauge being all secured to the mounting plate permits all calibration and zeroing to be accomplished while the working parts are outside of the gauge casing. The gauge is arranged for overpressure safety release rearwardly of the gauge in the event of tube rupture due to overpressure, and has an overpressure stop in the supplemental chamber that prevents 'on scale' gauge readings when the gauge is overpressured.