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V4055A1007:

The V4055 Actuator can be used with the characterized guide model of the V5055 or V5097 Gas Valve to enhance lightoff smoothness.
The standard model has an opening time of 26 seconds at 60 Hz or 32 seconds at 50 Hz.
Maximum closing time is one second, which meets code, standard and insurer requirements.
Maximum Safe Operating Pressure: 5 psi (34 kPa)
Ambient temperature rating is -40°F to +150°F (-40°C to +66°C) for 60 Hz models and -10°F to +158°F (-23°C to +70°C) for 50 Hz and 50/60 Hz models.
Standard enclosure meets NEMA 1 (IP30) requirements

V4055D1043:

Damper Shaft: Shaft is 3/8 in. (9.5 mm) square, for use with 7616BR Damper Crank Arm (ordered separately) and with or without damper shaft return spring.
Maximum Damper Shaft Rotation: 52 angular degrees.
Maximum Force: 2-11/16 in. (68.3 mm) radius for 7616BR Damper Crank Arm ordered separately (see Accessories section).