Siemens Building Technologies 331 Catalog Page
No. 6 Pneumatic Actuator —
Tandem Mounting
331
Description
A rugged, metal-fabricated device for tandem mounting,
the No. 6 Pneumatic Damper Actuator, is piloted by a
positioning relay, mounted on a sturdy angle iron frame.
Features
• Adjustable spring span and start point
• Spring return actuators
• Replaceable diaphragms
Arm Length Versus Rotation
If the damper rotation is other than 90°, use the Arm Length vs.
Rotation Chart and the Thrust and Torque Ratings to determine
the actuator assembly torque rating. Then divide the actuator
assembly torque rating by the damper torque rating per unit of
area for job conditions to determine the damper area that can be
controlled. Make sure the torque units used are the same.
Lever or Crank Arm Length
In. (mm)
2.3" (58 mm) 120°
2.8" (71 mm) 90°
3" (76 mm) 84°
4" (102 mm) 60°
5" (127 mm) 47°
6" (152 mm) 39°
7" (178 mm) 33°
8" (203 mm) 29°
9" (229 mm) 25°
Damper Rotation
in Degrees
331 No. 6 Pneumatic Damper Actuator—
Tandem Mounting.
Applications
The No. 6 Pneumatic Damper Actuator with tandem
mounting is recommended to position inlet vanes on fans
or large dampers that use a jack shaft.
Torque Rating
B-45
Damper Actuators
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No. 6 Tandem Mounting Specifications
B-46
Effective Diaphragm Area .......................................... 35.8 in.2 (230 cm2)
Stroke ................................................................................ 4-in. (102 mm)
Max. Air Pressure .......................................................... 30 psi (207 kPa)
Spring Start Point (Adjustable) ....................... 3 to 10 psi (21 to 69 kPa)
Spring Span (Adjustable) ................................ 3 to 12 psi (21 to 83 kPa)
Spring Range
Factory Setting ............................................... 8 to 13 psi (55 to 90 kPa)
Temperature Range
Operating...................................................-20 to +200°F (-29 to +93°C)
Storage ......................................................-20 to +200°F (-29 to +93°C)
No. 6 Tandem Mounting Product Ordering
Description Part No.
Damper Actuator with Tandem Mounting 331-3070
Accessories & Service Kits
No. 6 Tandem Mounting Dimensions
Materials
Housing ...................................................................................Aluminum
Stem ................................................................................... Type 416SS
Diaphragm .......................................................................Silicone rubber
Spring ............................................................................................. Steel
Bearing ............................................................................... Bronze Oilite
Air Connection .............................................................. 1/8" NPT Female
Type of Mounting .................Pivot; Universal (extended shaft for female)
Shipping Weight ............................................................30.0 lb. (13.5 kg)
B-49
Damper Actuators
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Dimensions shown in inches (mm).
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