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Title: A Comparative Review Of Bellows Flow Meters For Gas Measurement
Author: John m. Quirk
Source: 1969 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1969
Abstract: An engineering evaluation of existent differential pressure sensors undertaken in 1985 resulted in the development of the first truly dry bellows meter. V/ith the advancement in modern technology, it became apparent improvements could be offered to meet the demands of the user for a simpler, trouble free meter, providing increased output force and faster response for the operation of recorders, transmitters and controllers. The dry bellows meter as shown in Figure 1 has a single bellows, assembled by tungsten inert gas welding from carefully selected diaphragms. It is designed to be selfsupporting when exposed to high external pressure and when compressed the convolution nest one within the other to produce a solid column of metal. A valve stem passes through the metsr base and the center of the bellows. It supports two valves, the lower located between the meter base and the upper, or pop valve, below the bellows plate.

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