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Title: Emco High Pressure Balanced Valve Regulators
Author: Allen D. Mclean
Source: 1940 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1940
Abstract: There are four very essential reasons for the control of pressure in gas transmission and distribution. The first is a very obvious one and that is safety, for we cannot have too hiph a pressure on the mains, meters, appliances and other parts in the gas system. The second reason is transmission, for we must have at the initial end of any transmission or distribution hne sufiicient pressure to insure transmission of the gas in satisfactory quantities to the opposite terminal. The third is measurement since gas is a compressible fluid, its weight varies as the absolute pressure at which it exists, therefore at those points where gas is measured the pressure must be controlled very accurately or recorded very accurately. In general the higher the accuracy in pressure control at a meter the more accurate the measurement. The fourth reason is combustion when gas is burned it is forced through an orifice and united with air. The amount of gas passing through the orifice depends on the pressure and tlie efficiency of combustion depends upon the gas velocity and other factors at the point of combustion. Hence, accuracy in pressure control just ahead of the burning orifice is a very important consideration. In general the more accurately pressure is controlled in transmission and distribution systems, the better will be the results in all phases of the operation of the company.

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