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 Style | Type | Descriptions |
| 331-2905* | Pivot | 3-13 psi (21-90 kPa) | Actuator, Integral Pivot |
| 331-3001 | Universal Kit | 3-13 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* | Pivot | 8-13 psi (55-90 kPa) | Actuator, Integral Pivot |
| 331-2973* | Universal Kit | 8-13 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. |
| 331-2968 | Pivot | 8-13 psi (55-90 kPa) | Actuator, Integral Pivot, Clevis and Clevis Pin for use with frame mounting accessory |
| 332-2973 | Universal Kit with Positioning Relay | 8-13 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. |
