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Model D82 - Training Resources

Model D82 Protecting
an electric actuator

What does the D82 do?

The Model D82 Overtorque Protector™ prevents valve and actuator damage caused by excessive operating torque.

How the Model D82 is applied:

The Model D82 is typically mounted on the actuator shaft between the actuator and handwheel. Mounting connections are available for any kind of shaft, flange or other mounting type.

How to specify and order the D82:

Only two pieces of information are needed to specify
the Model D82.

1. Mounting description:

• Actual (not nominal) shaft diameter
• Nominal keyway width
• Shaft length

If mounting is other than round shaft with keyway please describe.

2. Trip torque:

For electric actuators:
Trip torque setting can be the same as the electric torque switch setting.
For manual actuators:
Trip torque can be set at lower of actuator or valve torque rating

Please consult factory if further information is needed.
This form will help to list the specifying information.

How to mount the D82:

To mount the Model D82, remove the handwheel, mount the D82 in its place then re-mount the handwheel on the D82.

D82 Features:

The Model D82 mechanism is permanently lubricated and hermetically sealed inside a rugged steel housing. The entire unit is corrosion protected by fusion-bonded epoxy coating with enamel topcoat and stainless steel components.

D82 Maintenance:

No maintenance is required.

How the D82 works:

Applied torque is transmitted through the Model D82 by a series of drive balls forced into matching detent by a set of springs, Applied torque greater than the trip torque setting will release the drive by forcing the balls out of the detents against the spring force. Trip torque is increased or decreased by screwing the calibration screws inward or outward to increase or decrease the spring force. The drive is automatically re-engaged by further rotation of the handwheel in either direction. Trip torque is the same in either direction of rotation.