Aunspach Controls Co., Inc.
About
Aunspach Controls Co., Inc., based in High Ridge, Missouri, has manufactured positive-action overtorque release clutches for valve actuators and control systems for over 40 years, serving municipal water, wastewater, and industrial process markets. The company's proprietary spring and ball/roller-detent technology provides precise, repeatable torque limiting that completely disconnects the drive when input torque exceeds a calibrated setpoint, then automatically re-engages without operator intervention—preventing costly damage to valves and actuators from overtorque events. All Aunspach clutches are hermetically sealed, permanently lubricated with MoS2 high-pressure grease, and require zero maintenance throughout their service life. Units are durability-tested for more than 10,000 trip cycles with no measurable wear, and trip points are repeatable within plus or minus 3 percent of setpoint over 1,000 cycles. The product line includes three models covering standard valve drive configurations: the D86 mounts directly on valves with 2-inch AWWA square operating nuts, with trip torque capacities from 25 to 500 lb-ft; the D80 protects handwheel-operated valves and electric actuator manual overrides up to 100 lb-ft; and the D87 accommodates higher-torque gearbox applications above 100 lb-ft. All products carry AWWA C213-approved fusion-bonded epoxy corrosion protection, exceed IP68 submersibility ratings tested to 70-meter water pressure, are BABA-compliant, and are manufactured in the USA. Aunspach clutches are specified by water municipalities across North America and operate on five continents in applications including municipal water distribution, wastewater treatment, nuclear and fossil power generation, refineries, offshore platforms, and pipelines.
Key Products
A torque-limiting clutch that mounts directly onto valves with 2-inch AWWA square operating nuts—including butterfly, ball, gate, and resilient seat gate valves—automatically disengaging when torque exceeds preset limits to prevent valve damage, then re-engaging automatically.
A torque limiter installed between the handwheel and valve actuator on handwheel-operated valves and on the manual override handwheel of electric actuators, protecting against overtorque damage during manual valve operation.
A high-torque-capacity torque limiter for gearboxes and valve actuators requiring overload protection above 100 lb-ft, installing on the valve or gearbox input shaft and protecting equipment during both powered and manual operation.
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