AUMA GS 160.3 Part-Turn Worm Gearbox (14,000 Nm)

Overview

AUMA GS 160.3 is the point in the GS series where the quarter-turn gearbox becomes a heavy piece of equipment: 14,000 Nm of valve torque in open-close duty, a 100 mm output shaft capacity and a housing that weighs 80 to 91 kg. It is the size specified for big butterfly valves on trunk water mains, large ball valves on pipeline stations and dampers in power-plant ducting, where an engineer needs far more than the 4,000 Nm of a GS 100.3 but not yet the 28,000 Nm of a GS 200.3. Its four ratios, 54:1, 218:1, 442:1 and 880:1, span an unusually wide range of operating times, from 8 seconds to 61 seconds for a quarter turn.

Seven Star LLC is the official trusted supplier and regional supplier for AUMA, and we supply the AUMA GS 160.3 to power, water and oil and gas customers throughout the Sultanate of Oman and the GCC. A gearbox of this size is almost always part of a complete valve automation package, so our engineers help with the extension flange selection, the actuator pairing and the handover documentation rather than shipping the casting alone.

Working Principle of the AUMA GS 160.3

The AUMA GS 160.3 drives a worm wheel from a worm shaft in a cast iron housing, with a spigot machined directly into the housing from this size upward and a plane-machined face available as an option. The worm wheel turns the valve shaft through a splined coupling, and the swing angle is adjustable between 80 and 100 degrees as standard, set to 92 degrees in the factory unless ordered otherwise. Optional ranges step from 0 to 190 degrees, with angles above 190 degrees only possible with a bronze worm wheel and without end stops.

The ratio table shows how steeply the input torque falls as the ratio climbs: a 14,000 Nm valve needs 667 Nm at the input shaft on the 54:1 ratio, 184 Nm at 218:1, 90 Nm at 442:1 and only 51 Nm at 880:1. The conversion factors are 21.0, 76.0, 155 and 276, and the turns for a 90-degree swing are 13.5, 54.5, 110.5 and 220. The three high ratios are built with primary reduction or planetary gearing and weigh 91 kg against 80 kg for the direct 54:1 ratio, and the end stops are guaranteed to 3,200, 900, 450 and 250 Nm respectively.

Engineering Design of the AUMA GS 160.3

Valve flanges F25, F30 and F35 to EN ISO 5211 are supported, with the F35 variant mounted via an extension flange that is screwed and doweled to the housing and adds 33 kg. The input shaft is 30 mm for the 54:1 ratio, 30 mm or 20 mm for 218:1 and 20 mm for the two highest ratios, with input mounting flanges F16 (F14), F14 (F10) and F10. That gives a choice of SA 14.2 to SA 16.2 actuators on the lowest ratio and an SA 10.2 on the highest.

The housing is cast iron with a spheroidal cast iron worm wheel, protected to IP68 and KS corrosion class, and it operates from -40 to +80 degrees Celsius in standard form. Lifetime is 2,500 cycles at maximum torque in duty class 1 and 1,000 cycles in duty class 2, where the permissible valve torque rises to 17,500 Nm for infrequently operated valves. The explosion-protected version carries a mean output torque of 8,000 Nm for three OPEN-CLOSE-OPEN cycles.

Ratio, Torque and Weight Data for the AUMA GS 160.3

The following figures for the AUMA GS 160.3 are taken from the duty class 1 motor operation table and the end stop table in AUMA’s technical data sheet.

The extension flange for F35 valve attachment adds 33 kg, and the 17,500 Nm rating of duty class 2 and duty class 3 applies to every ratio shown.

Key Features

The AUMA GS 160.3 gives large quarter-turn valves a rugged, self-locking drive with a very broad choice of ratios:

• Maximum valve torque of 14,000 Nm in duty class 1 and 17,500 Nm in duty classes 2 and 3.
• Four reduction ratios from 54:1 to 880:1 with fastest 90-degree times between 8 and 61 seconds.
• Input torque for a full-load valve falls from 667 Nm to 51 Nm across the ratio range.
• Valve attachment F25, F30 and F35 to EN ISO 5211 with an output shaft capacity of 100 mm.
• Guaranteed end stop strength of 3,200 Nm on the 54:1 ratio for input side operation.
• Integral spigot in the housing and a factory swing angle adjustable between 80 and 100 degrees.
• Extension flange option for F35 attachment, screwed and doweled to the housing.
• Lifetime of 2,500 cycles at maximum torque in duty class 1, with IP68 and KS protection as standard.

Industrial Applications

Trunk water mains, raw-water intake pumping stations and large power-station cooling circuits use valves whose seating torque lands in the 8,000 to 14,000 Nm range, and the AUMA GS 160.3 is the gearbox that AUMA sizes for them. In the Sultanate of Oman that means butterfly valves at desalination outfalls, cooling water isolation at gas-fired plants and large ball valves on pipeline pumping stations, where the 54:1 ratio gives a closing time of eight seconds when surge control demands it and the 442:1 or 880:1 ratio lets a modest actuator move a very large valve slowly to limit water hammer.

In Oman and the GCC, Seven Star LLC supplies the AUMA GS 160.3 with SA multi-turn actuators, handwheels and controls to utilities, EPC contractors and plant operators across Oman and the GCC, including customers in the Sohar and Salalah economic zones. See also the AUMA GS part-turn gearbox range for neighbouring sizes and the AUMA SA 07.2 multi-turn actuator for the lowest-torque input option. A further useful reference is the AUMA SA 10.2 multi-turn actuator.

Related pages on our site: AUMA GS 100.3, AUMA GS 250.3 and AUMA SA and GS combination.

Technical Specifications

Below are the AUMA GS 160.3 entries from the combined GS 50.3 to GS 250.3 sheet, including the guaranteed end stop strength for each ratio.

On the AUMA GS 160.3, ratio choice trades actuator size against closing time: 54:1 asks for 667 Nm at the input and closes in 8 s, while 880:1 asks for only 51 Nm but needs 61 s for a quarter turn.

Request a Quote for AUMA GS 160.3

Please send your RFQ for the AUMA GS 160.3 with the valve torque, the required closing time, the flange size and the intended actuator. Seven Star LLC will check the ratio and extension flange against AUMA’s data, forward the technical data sheet that can also be downloaded from this page and quote delivery from regional planning. In Oman and the GCC, we provide a quotation on request and technical support from Muscat.