AUMA GHT 500.3 Multi-Turn Gearbox (50,000 Nm)

Overview

AUMA GHT 500.3 is the second size of the current GHT multi-turn gearbox series, rated for a maximum output torque of 50,000 Nm in accordance with EN ISO 22109 and a constant run torque of 32,500 Nm across the full travel. It is built for large industrial valves such as gate valves and globe valves, but also for special valves such as louvre dampers, stack dampers, diverters, weirs and sluice gates, where the torque is high over the whole stroke. Three ratios, 10.25:1, 15:1 and 20.5:1, and an F60 attachment on a 765 kg housing define the product.

In Oman and the GCC, Seven Star LLC supplies the AUMA GHT 500.3 to power, water and heavy-industry customers across the Sultanate of Oman and the GCC.

Working Principle of the AUMA GHT 500.3

The AUMA GHT 500.3 uses a bronze worm wheel in a cast iron housing (spheroidal cast iron as an option) to turn the multi-turn output of an actuator into very high torque at the valve stem. It is not self-locking, and the standard direction of rotation has clockwise input giving clockwise output (RR), with LL, RL and LR variants available on request. AUMA specifies two torque characteristics: the maximum output torque according to EN ISO 22109 and a constant torque across 100 percent of the travel.

For the 10.25:1 ratio the conversion factor is 8.2, with a maximum input torque of 6,100 Nm at 50,000 Nm and 3,960 Nm at the constant run torque of 32,500 Nm. The 15:1 ratio has a factor of 12 and needs 4,200 Nm and 2,710 Nm, and the 20.5:1 ratio has a factor of 16.4 and needs 3,100 Nm and 1,980 Nm. The maximum input speed is 45 rpm, and the output speed at a 45 rpm actuator is 4.4 rpm at 10.25:1, 3.0 rpm at 15:1 and 2.2 rpm at 20.5:1.

Engineering Design of the AUMA GHT 500.3

The valve attachment is F60 according to EN ISO 5210 with a maximum shaft diameter of 180 mm, and the standard output drive type is B based on EN ISO 5210, with type C, type A according to ISO 5210 and type AF as options. The input shaft is 80 mm cylindrical with a parallel key to DIN 6885-1, and a second shaft end is an option. Weight is 765 kg including the input shaft, output drive type B, the largest possible input flange and standard lubricant.

Actuator pairing follows the ratio: the 10.25:1 ratio takes the SA 35.1, the 15:1 and 20.5:1 ratios take the SA 30.1, with input flanges F25, F30 and F35. Enclosure protection is IP68 with up to 8 m head of water and up to 96 hours of continuous immersion, corrosion protection is KS with KX as an option, and the temperature range is -40 to +80 degrees Celsius with -60 to +60 and 0 to +120 degree options. The standard ATEX marking is II 2G Ex h IIC T3 Gb and II 2D Ex h IIIC T190 degrees Celsius Db.

Ratio and Speed Data of the AUMA GHT 500.3

The three ratios of the AUMA GHT 500.3 are published in AUMA’s data sheet with the following values.

The maximum input speed of the AUMA GHT 500.3 is 45 rpm, and the actuator torque must be verified for run times above two minutes.

Key Features

The AUMA GHT 500.3 adds a very high continuous torque capacity to the heavy multi-turn gearbox range:

• Maximum output torque of 50,000 Nm and a constant run torque of 32,500 Nm.
• Three ratios, 10.25:1, 15:1 and 20.5:1, with factors from 8.2 to 16.4.
• Bronze worm wheel in a cast iron housing with a spheroidal cast iron option.
• F60 valve attachment to EN ISO 5210 with a maximum shaft diameter of 180 mm.
• Output drive type B as standard with types C, A and AF as options.
• Actuator mounting of SA 30.1 and SA 35.1 through F25, F30 and F35 flanges.
• Weight of 765 kg with an 80 mm input shaft.
• IP68 enclosure, KS corrosion protection and ATEX marking II 2G Ex h IIC T3 Gb.

Industrial Applications

The AUMA GHT 500.3 is meant for valves and gates with a high torque over the entire travel, such as sluice gates and weirs on water intakes, louvre dampers and stack dampers in power-plant flue systems and large gate valves in water transmission. In Oman these applications appear on desalination intake structures and flue-gas systems of power stations, where the constant run torque rating of 32,500 Nm is as important as the peak value.

In Oman and the GCC, Seven Star LLC supplies the GHT 500.3 and matching SA actuators to EPC contractors and utility owners across Oman and the GCC, with coverage for Sohar, Duqm and Salalah. See also the AUMA GST spur gearbox family and the AUMA GS part-turn gearbox range. Buyers also frequently check the AUMA SA 10.2 multi-turn actuator.

Related pages on our site: AUMA GHT 360.2, AUMA GHT heavy-duty multi-turn gearbox and AUMA SA and GHT combination.

Technical Specifications

The AUMA GHT 500.3 appears in the GHT 320.3 to GHT 1200.3 sheet, from which these values are taken.

The 10.25:1 ratio with an SA 35.1 is the fastest option but the actuator is not self-locking at 32 rpm and above, and AUMA asks for actuator sizing to be verified for run times above two minutes.

Request a Quote for AUMA GHT 500.3

Submit your RFQ for the AUMA GHT 500.3 with the valve torque, the constant run torque, the interface and the preferred actuator, and Seven Star LLC will confirm the ratio and quote delivery. The AUMA technical data sheet can be downloaded from this page, and our team in Muscat supports lifting plans and commissioning. In Oman and the GCC, we supply every gearbox on request, with lead time confirmed at quotation.