Chemical Technology August 2015

AUMA part-turn gearbox now has enhanced flexibility for sizing

Manufacturing advancements underpin en- hanced sizing flexibility for AUMA’s part-turn GS gearboxes. Three duty classes, (1, 2 and 3), have been introduced to support all an- ticipated operations across predicted valve lifetimes. The new classifications, paired with the introduction of additional flange sizes, enable the company’s GS gearboxes to be mounted on larger valve flanges. AUMA GS gearboxes play a key role auto- mating large scale butterfly and ball valves: the company’s established range caters for torques between 500 to 675 500 Newton metres. Comprehensive product revisions undertaken by AUMA encompassing cor- rosion protection, surface treatment of metals, enhancement of connection tech- nologies and selection of optimal lubricants have improved themechanical properties of the gearboxes and given AUMA a platform to reassess permissible torques. With no binding standard for valve gearboxes, AUMA continues to adhere to EN 15714-2, which defines high lifetime requirements for actuators. EN 15714-2 specifies a sophisticated load profile for type tests and lifetimes up to 10 000 operation cycles, depending on the device’s size. AUMA’s rigorous test procedures confirm

FOCUS ON PUMPS AND VALVES

that its devices exceed these standard requirements. The lifetime specifications of the stan- dard are the basis of AUMA’s newly intro- duced duty class 1 gearbox. For duty class 2, assuming infrequent operation, 1 000 duty cycles is assumed: this increases the permissible gearbox torque by 25 percent. In these instances, smaller and more cost- efficient gearbox sizes can be selected to

GS gearboxes are frequently combined with AUMA actuators.

suit the customers’ applications. Duty class 3 is adopted for manually operated gear- boxes enabling higher torque levels due to extremely infrequent operations.

For more information visit www.auma.com z

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Chemical Technology • August 2015 Minerals weirminerals.com

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