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Title: Bellows-Type Orifice Meters
Author: A. I. Thompson
Source: 1955 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1955
Abstract: Although a few single bellows unites have been used in gas measurement, when one speaks of a Bellows-Type Orifice Meter today, he is by convention, referring to the dual-bellows rupture proof type differential pressure recorder. The differential across the orifice plate is continuously recorded on either a square root or uniformly graduated chart. By using the proper orifice and flow constants, a correct meter factor can be calculated to give rate of flow. The basic differee between this meter and other orifice meters, is the Differential Pressure Unit commonly referred to as the Meter Body. Briefly, it consists of a bellows unit assembly and two housing heads fastened together with a set of bolts. A cross section of one of these units is illustrated in Figure 1.

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