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Model D87 - Training Resources

Model D87 Protecting
manual actuator and valve

What does the D87 do?

The Model D87 prevents overtorque damage to manual actuators and gearboxes by eliminating damaging overtorque before it transmits to the actuator or valve. The D87 mounts directly on the actuator or gearbox's input shaft. It's easy to mount the D87 on new applications, and easy to retrofit on existing applications.

How the D87 works:

The Model D87 will transmit enough torque to safely operate the actuator or gearbox, but will not transmit damaging torque. As soon as too much torque is transmitted, the D87's hardened rollers rise out of their detents (overcoming the force of belleville springs), which effectively prevents damaging torque from being transmitted further. The D87's rollers will then automatically re-engage into four evenly spaced detents, and continue operation in the same manner until the input torque is lowered to a safe (preset) amount.

How to apply the D87:

The D87 is designed to any manual actuator or gearbox. Please specify the actuator's input shaft dimensions, and your desired trip-torque at the time of your order. The standard D87 features a bore to fit specifically over your existing input shaft, and either a shaft or an AWWA 2" operating nut.

How to mount the D87:

The D87 is offered with a variety of end-connections to accomodate your application. Simply place the D87 on the shaft of the actuator/gearbox and tighten the two mounting screws. Other end-connections, such as splines, square shafts, tapered shafts etc., are available upon request.

How to specify and order the D87:

A) Simply fill out this form.


B) Specify the manufacturer and model number of your actuator. Also, if available, please specify handwheel shaft dimensions/details and desired trip-torque.

Contact Us for more information or for any questions.