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Siemens No. 4 Pneumatic Actuator

Pneumatic Actuator
No. 4

Designed with a 4-inch (102 mm) stroke, the No. 4 Pneumatic Actuator is a rugged, metal-fabricated device that provides gradual or positive actuation of HVAC and fire/smoke dampers.

• Replaceable diaphragm
• Positioning relay (optional)
• Forward travel stops (optional)
• Hesitation model (provides minimum ventilation without separate damper/actuator)
• Variety of spring ranges for sequencing with other control devices
• Stainless steel actuator shaft

Select a link under the "item" tab below to order.

Cat #Mounting StyleTypeDescriptions
331-2905*Pivot3-13 psi (21-90 kPa)Actuator, Integral Pivot
331-3001Universal Kit3-13 psi (21-90 kPa)Actuator, Integral Pivot with pivot post. Mounted on plate for extended shaft with Clevis and Crank for 3/8” (9.5 mm), 7/16” (11 mm), 1/2” (13 mm) diameter shaft. Parts for frame mounting (blade drive) included with kit.
331-2961*Pivot8-13 psi (55-90 kPa)Actuator, Integral Pivot
331-2973*Universal Kit8-13 psi (55-90 kPa)Actuator, Integral Pivot with pivot post. Mounted on plate for extended shaft with Clevis and Crank for 3/8” (9.5 mm), 7/16” (11 mm), 1/2” (13 mm) diameter shaft. Parts for frame mounting (blade drive) included with kit.
331-2968Pivot8-13 psi (55-90 kPa)Actuator, Integral Pivot, Clevis and Clevis Pin for use with frame mounting accessory
332-2973Universal Kit with Positioning Relay8-13 psi (55-90 kPa)Actuator, Integral Pivot with pivot post and Positioning Relay. Mounted on plate for extended shaft with Clevis and Crank for 3/8” (10 mm), 7/16” (11 mm), 1/2” (13 mm) diameter shaft. Parts for frame mounting (blade drive) included with kit.


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