AUMA GP 16.1 Planetary Gearbox (700 Nm)

Overview

AUMA GP 16.1 is the third size of the GP planetary gearbox family and the first to use the heavier 19.5 kg housing. It is a coaxial design, which means the input shaft and the valve stem share one axis, so the actuator or handwheel sits directly above the valve instead of beside it. With 700 Nm of maximum valve torque, an F16 flange and a 40 mm bore, it adds torque multiplication of 4:1 or 8:1 to gate valves and globe valves that need a little more than a direct-mounted actuator can provide.

In Oman and the GCC, Seven Star LLC supplies the AUMA GP 16.1 to industrial and utility customers across the Sultanate of Oman and the GCC.

Planetary Working Principle of the AUMA GP 16.1

The AUMA GP 16.1 uses a planetary gear train: a sun gear driven by the input shaft turns planet gears that run inside a fixed ring gear and carry the output. Because load is shared across several planets, the gearbox is compact for its torque rating, and because the input and output rotate about the same axis it can be bolted in line with the valve stem. Clockwise rotation at the input shaft gives clockwise rotation at the output, and the unit can be mounted in any position.

The 4:1 ratio has a conversion factor of 3.6 and needs 194 Nm at a 30 mm input shaft to deliver 700 Nm, while the 8:1 ratio has a factor of 7.2 and needs only 97 Nm at a 20 mm input shaft. That difference decides the actuator: the 4:1 ratio accepts an SA 14.2 through an F14 flange, while the 8:1 ratio accepts the smaller SA 10.2 through an F10 flange. Both ratios weigh 19.5 kg, and for manual duty AUMA lists a 500, 630 or 800 mm handwheel for the 4:1 ratio and 250, 315 or 400 mm for the 8:1 ratio.

Engineering Design of the AUMA GP 16.1

The valve attachment is type B3 according to EN ISO 5210, a bore with parallel keyway, on an F16 flange with a 40 mm shaft diameter. The input shaft carries a metallic surface protection and a cylindrical shape with a parallel key to DIN 6885-1, and the input mounting flange takes the multi-turn actuator directly with no spacer.

The gearbox is rated IP68-8 as standard (8 m head of water) with IP68-20 as an option, KN corrosion protection with KS and KX options, and a standard ambient range of -60 to +80 degrees Celsius, extendable to 0 to +140 degrees Celsius for short periods up to 150 degrees with reduced lifetime. Open-close duty is S2-15 minutes and modulating duty S4-25 percent, and in potentially explosive atmospheres the gearbox is restricted to manual operation with a lifetime of 500 cycles.

Ratio and Handwheel Data of the AUMA GP 16.1

The two ratios of the AUMA GP 16.1 are published as follows in AUMA’s technical data.

Both ratios share the 700 Nm valve torque, the F16 flange and the B3 bore output.

Where the AUMA GP 16.1 Sits in the GP Range

AUMA’s GP 10.1 to GP 30.1 data sheet lists five sizes, and the AUMA GP 16.1 is the middle one. The series starts at 100 Nm with the GP 10.1 (F10 flange, 20 mm shaft, 6.0 kg), moves to 400 Nm with the GP 14.1 (F14, 30 mm, 6.0 kg), reaches 700 Nm with this size (F16, 40 mm, 19.5 kg), then climbs to 1,200 Nm with the GP 25.1 (F25, 50 mm, 55 to 65 kg) and 2,500 Nm with the GP 30.1 (F30, 60 mm, 63.5 to 75.5 kg). The step from 6.0 kg to 19.5 kg shows where the planetary stage grows to carry 700 Nm, and the GP 16.1 is also the first size to offer an 8:1 ratio.

For a buyer, the practical consequence is the actuator pairing. The GP 14.1 at 4:1 takes an SA 10.2, the GP 16.1 at 4:1 takes an SA 14.2, and the GP 25.1 at 4:1 moves up to an SA 14.6, so each size step is also a step in actuator frame. Valves that sit between 400 and 700 Nm therefore fall to the GP 16.1 even if the stem is only 30 mm, and the F16 flange and 40 mm bore should be confirmed against the valve drawing before ordering.

Key Features

The AUMA GP 16.1 is a compact in-line torque multiplier for medium multi-turn valves:

• Coaxial planetary gearing keeps input and output on one axis, so the actuator sits directly over the valve stem.
• A 700 Nm valve torque is reached with a 4:1 or 8:1 reduction, with factors of 3.6 and 7.2.
• The 8:1 ratio needs only 97 Nm, so an SA 10.2 can operate a valve that would otherwise require an SA 14.2.
• A B3 bore with keyway on an F16 flange takes a 40 mm stem.
• The 19.5 kg housing is identical for both ratios.
• Handwheels run from 500 to 800 mm on the 4:1 ratio and from 250 to 400 mm on the 8:1 ratio.
• IP68-8 protection comes with KN coating, and KS or KX options suit salty air.
• The ATEX version, II 2G Ex h IIC T4 Gb, is restricted to manual operation with a 500-cycle life.

Industrial Applications

The AUMA GP 16.1 suits gate valves and globe valves in the middle torque range where the stem axis must stay in line with the actuator. Typical cases are cooling-water isolation valves, boiler house stop valves and process line isolation valves in plants around Sohar, where the actuator cannot be offset sideways. Choosing the 8:1 ratio lets a smaller SA 10.2 operate a valve that would otherwise need an SA 14.2, which can help standardise spare parts across a site.

In Oman and the GCC, Seven Star LLC supplies the AUMA GP 16.1 with SA actuators, handwheels and controls to EPC contractors, utilities and plant operators throughout Oman and the GCC, including the Salalah economic zone. See also the AUMA SA 10.2 multi-turn actuator, the AUMA GST spur gearbox family and the AUMA GS part-turn gearbox range.

Related pages on our site: AUMA GP 30.1 and AUMA GP planetary gearbox family.

Technical Specifications

The AUMA GP 16.1 rows of the GP 10.1 to GP 30.1 sheet are summarised in the table below.

The 4:1 ratio needs 194 Nm at the input and an SA 14.2, while 8:1 needs 97 Nm and an SA 10.2; the ATEX version of this size is manual-only, with a 500-cycle life and an ambient range of -30 °C to +70 °C.

Request a Quote for AUMA GP 16.1

Send Seven Star LLC an RFQ for the AUMA GP 16.1 with the valve torque, the stem bore and the actuator you plan to mount, and we will confirm the ratio and quote delivery. The AUMA technical data sheet can be downloaded from this page, and our instrumentation division in Muscat can advise on handwheel and actuator selection. In Oman and the GCC, we supply gearboxes on request, with lead time confirmed at quotation.