Series 2G Diaphragm Actuators 

Designed for snap or throttling service (when used with a positioner) of Norriseal angle-disc butterfly valves and other types of quarter-turn valves.

Series 2G actuators can be configured with spring-return (“fail-safe”) operation or with a double-acting diaphragm for low-pressure applications.

Available in four size ranges with torque output to 17,000 in. lbs. The field-proven design easily adapts to various mounting styles and shaft types. A wide range of accessories is available, including electric and pneumatic positioners and limit switches.

• Spring-return or double-acting
• Spring Rotation from clockwise to counter-clockwise is field-reversible
• Easily adapted to various mounting styles and shaft types
• Can be actuated with as little as 10 psig supply air
• Adaptable to water or oil as the supply source
• Wide range of switches, positioners and other accessories can be mounted

• Actuates with as little as 10 psig supply air
• Precise control when used with positioners, switches, solenoids or other available accessories
• Operates using air, natural gas, nitrogen or other readily available gases
• Optional fail-safe operation:
  (1) with spring-return models or
  (2) pressure-balanced units equipped with reserve air
• Rugged, weatherproof construction includes totally enclosed gear and rack, as well as gear case seals to protect moving parts from corrosion
• Closed yoke to protect the diaphragm stem from corrosive atmospheres