How are most service regulators classified?

How are most service regulators classified?

• A. Direct acting
• B. Indirect acting
• C. Reversing acting
• D. Combination action

Answer: (A)

Most service regulators are direct-acting. In this type, the pressure being regulated is sensed directly by a diaphragm, and that diaphragm’s movement directly moves the main valve to open or close and keep the downstream pressure at the set point. This simple, direct relationship fits the low pressures and modest flow rates typical of residential gas service, making the regulator compact, reliable, and easy to maintain. Indirect-acting regulators use a pilot valve and a separate actuator to control the main valve, which adds complexity and is chosen when higher flow or tighter regulation under varying demand is needed. The other action types aren’t commonly used for standard service Regulators because they don’t offer the straightforward, compact performance that residential service requires.

Most service regulators are direct-acting. In this type, the pressure being regulated is sensed directly by a diaphragm, and that diaphragm’s movement directly moves the main valve to open or close and keep the downstream pressure at the set point. This simple, direct relationship fits the low pressures and modest flow rates typical of residential gas service, making the regulator compact, reliable, and easy to maintain.

Indirect-acting regulators use a pilot valve and a separate actuator to control the main valve, which adds complexity and is chosen when higher flow or tighter regulation under varying demand is needed. The other action types aren’t commonly used for standard service Regulators because they don’t offer the straightforward, compact performance that residential service requires.