Viscous Speed Governors (VSG)

VSG leads the expansion of our core

product offering

The VSG's simple, lightweight rugged construction

provides reliable performance for numerous industrial

applications. The VSG controls rotation of shafts and

hinged loads by using silicone-based viscous shearing

technology. An inner rotor is surrounded by silicone fluid

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

components size, weight, spring assist and desired

cycle time.

Common Applications

• Overhead and rolling steel fire doors, grilles,

and shutters

• Conveying - braking of free conveyor rollers and

ramps

• Material Handling - hoist integration,

free-fall load protection

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 métairie construction

Typical VSG Application

Lateral Motion

Features and Benefits

• Safely and quietly controls rotary motion

• Provides consistent speed control through

360° of rotation, in both directions

Handles linear motion via simple rack

and pinion integration

• Industry standard shaft and keyway

mounting configurations

• Wide range of ambient operating conditions - indoor

or outdoor, -40° F to +200° F (-40° C to +95° C)

• Customer-specified performance over a wide

range of operating RPM

• Maintenance-free - no adjustments required

^ ITT

Koni

Enidine

Typical Shaft Installation

Exploded View

Rotor

Keyed

to Shaft

Shaft

Outer Cover

■Housing

Silicone Fluid

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.

EME