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Title: Measuring And Regulating Station Design
Author(s): [Not Available]
Source: 1965 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1965
Abstract: as to the type of regulator to be used, as well as the size and location. To have satisfactory regulator operation there must be a reasonably correct forecast as to the load conditions. In selecting a regulator for a particular installation, a study must be made to ascertain if the actual conditions under which the gas regulation is to occur are within the limits of the regulator equipments operating ability. The first consideration to be given is to the type of regulator to be used. The industry generally considers regulators for use with high pressures in two classifications: 1. The pilot loaded regulator, where a small direct operating regulator controls the pressure on the diaphragm, and 2. The instrument controlled regulator where the controlled pressure is sensed by a pressure element that indirectly controls the diaphragm pressure. The pilot loaded regulator has a longer valve travel and is more sensitive than some of the so-called direct operated regulators (where the control pressure acts directly on the diaphragm). These regulators are so sensitive that if placed in series, they will hunt and cycle if the upstream pressure and volumes fluctuate.

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