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Title: Fundamentals Of Pressure Control
Author: Doug Butler
Source: 1985 Appalachian Gas Measurement Short Course
Year Published: 1985
Abstract: An example of a self operated regulator is a spring opened valve directly opposed by a diaphragm assembly (Fig. 1). Gas, at increasing downstream pressure, acts on the diaphragm assembly to overcome the force of the spring, closing the valve. When downstream pressure fails, spring force is greater than the force of tlie gas acting on the diaphragm, and the valve opens. Regulator valves have many variations. They can be balanced or unbalanced, single ported or double ported. But common to all regulator valves is a control inaccuracy caused by spring effect.

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