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Title: Large Capacity Displacement Meters
Author: H. V. Beck
Source: 1941 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1941
Abstract: The large capacity displacement meter operates on the same fundamental principles as do the smaller meters used for domestic seivice. The same common comparison of the meter with a steam engine having D-slide vajves can be made. The front and bacli sections of the meter have operating cycles that are 90 degrees apart, as does the two cylinder steam engine this prevents the meter-or the steam engine -from ever stopping in a dead-center position from which it could not start up of itself. Although the fundamental principles of operation of the large capacity displacement meter and the smaller displacement meters are identical, the detaUs of their design differ considerably. The valve timing mechanism, although fundamentally the same, is often constructed more elaborately in order to obtain decreased angular movement of the parts. The decreased angular movement permits more accurate valve timing and decreases the amount of wear at bearing points. The large capacity displacement meter is also fitted with better bearings and with increased facilities for lubrication in order that it may withstand the greater strains to which it is subjected. Large capacity meters measuring high pressure gas usually operate at a greater difference of pressure than do the small domestic meters, since the gas which is being metered has a greater density.

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