• Rugged cast iron gear housings
  • Ball bearing supported bevel pinion and bevel gears
  • Removable, bronze alloy stem nut for mating to the valve stem
  • Adaptable to Flowserve Limitorque electric actuator



The Flowserve Limitorque B320 series bevel gear operators provide efficient and reliable operation for multi-turn applications. Suitable for manually operated valves, gates or motorized operation with Flowserve Limitorque MX, L120, and SMB series electric actuators, the B320 series provides versatility to meet any required operating condition.

For manually operated valves and gates the B320 operators can be driven by handwheels, chainwheels, or wrench nuts. An optional spur gear attachment is available to further reduce the required input torque or rim pull effort.

With five product sizes covering torque ranges to 8,000 ft.lbs. and 325,000 lbs. thrust, there is a B320 product suited to virtually any multi-turn application.

The Flowserve Limitorque B320 bevel gear operator notonly makes it easy to manually operate multi-turn valves— it also makes it easy to convert to motorized service.Limitorque offers the B320 in an extended array of standardsizes and configurations to cover the widest range of applications,with the most common units are in stock for immediate shipment. Limitorque also accommodates specialized needs with a variety of options, including handwheels, chainwheels, spur gears, and operating wrench nuts. Like every Limitorque product, the B320 is backed by Flowserve’s worldwide service and parts supply network.


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