Viscous Speed Governors (VSG)
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Viscous Speed Governors (VSG) Features and Benefits • Safely and quietly controls rotary motion • Provides consistent speed control through 360º of rotation, in both directions • Handles linear motion via simple rack and pinion integration VSG leads the expansion of our core product of fering • Industry standard shaft and keyway mounting configurations • Wide range of ambient operating conditions - indoor The VSG’s simple, lightweight rugged construction or outdoor, -40º F to +200º F (-40º C to +95º C) provides reliable performance for numerous industrial applications. The VSG controls rotation of shafts and • Customer-specified performance over a wide hinged loads by using silicone-based viscous shearing range of operating RPM technology. An inner rotor is surrounded by silicone fluid • Maintenance-free - no adjustments required within the stationary housing. As the shaft rotates, the inner rotor shears the silicone fluid providing resistance and smooth motion. Fluid viscosity of each VSG is selected after considering variables such as the Typical Shaft Installation components size, weight, spring assist and desired Exploded View cycle time. Common Applications • Overhead and rolling steel fire doors, grilles, and shutters • Conveying - braking of free conveyor rollers and ramps Rotor Keyed to Shaft Outer Cover • Material Handling - hoist integration, free-fall load protection Silicone Fluid • Steering Control - resistance offers over-steering protection • Amusement Industry - limiting sway and range of motion • Industrial Safety - controlling shaft or hinged loads • Marine Applications - 100% high-tech, non metallic construction Typical VSG Application Lateral Motion Ideally suited for the Rolling Overhead and Fire Door Control In new and retrofit applications, a single VSG can be installed on rolling doors by simply mounting to the keyed door shaft per the original door manufacturer’s instructions. Unlike noisy ratcheting devices, the VSG requires no adjustments during installation or while in-service and can control the closing and opening speed of most large doors. Multiple governors can be used to handle over-sized doors. Currently in use by most major door manufacturers, the patented VSG meets industry standards outlined by Underwriters Labratory, Warnock Hersey and Factory Mutual. It has passed the 3-hour fire door burn test and conforms to numerous industry standards. ITT Enidine Inc. | 7 Centre Drive | Orchard Park, NY 14127, USA Tel.: 1 (716) 662-1900 | Fax: 1 (716) 662-

Viscous Speed Governors (VSG) Ordering Information Dimensional Data Specify Part Number (example: A715477-005) Optional Mounting Hole for 3/8” Hardware (8mm) Specify Required Shaft-Bore x Keyway Specify Required Fluid Viscosity x ‘000 Performance Characterisitics Breakaway Torque Requirements: Material: Weight: Damping Medium: 35 in-lbs. (4 Nm.) for fluids 1K, 5K, 10K (cSt.) 50 in-lbs. (5.6 Nm.) for fluids 30K and 60K (cSt.) 70 in-lbs. (8 Nm.) for fluids 100K+ (cSt.) High Performance Polymer Composite Govern Descent of Rolling Steel Fire Doors Dynamic Torque: Refer to Selection Guides...