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Title: Bellows Type Orifice Meters
Author: W. m. Reese, Jr.
Source: 1966 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1966
Abstract: There are two basic designs of bellows type orifice meters. They are the hydraulic and the mechanical types. (See Figures 1 and 2) The industry makes this distinction since one type depends solely on the transfer of seal fluid from one chamber to another for differential readings, and the mechanical design uses a piston connected to both bellows for displacement. We will first cover the basics of both designs, covering each operating segment of the sensing unit. Secondly, we will examine the major causes of failure of the bellows meter in actual operation. In conclusion, we will emphasize the many improvements which have evolved in the bellows type orifice meter since its introduction to gas measurement in 1949.

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