AUMA GHE 12.1 Part-Turn Worm Gearbox (1,000 Nm)

Overview

For hand-operated quarter-turn valves in the heavy class, the AUMA GHE 12.1 is AUMA’s biggest manual worm gearbox. One thousand Newton-metres at the valve come from roughly forty at the handwheel, the shaft capacity reaches 50 mm, and the whole unit weighs 13 kg. Because it never needs a motor, it suits isolation valves that are turned a handful of times each year, and the self-locking gearing makes sure the disc stays where the operator left it.

In Oman and the GCC, Seven Star LLC supplies the AUMA GHE 12.1 to valve manufacturers, contractors and plant owners across the Sultanate of Oman and the GCC. Our engineers check the valve flange, the shaft and the available manual force against AUMA’s data and supply the gearbox with manufacturer documentation.

Operating Principle of the AUMA GHE 12.1

A worm shaft, driven by the handwheel, meshes with a worm wheel on the output coupling of the AUMA GHE 12.1. The housing is spheroidal cast iron to GJS-500-7, with bronze alloy available for seawater duty, and the hardened steel coupling can likewise be ordered in bronze. A pointer follows the valve at all times, so the position is visible from the operating platform.

Eighty turns of reduction, a factor close to 25 and twenty handwheel revolutions per quarter turn define the feel of the gearbox. The stop positions are factory-set to 90 degrees within a fixed window of 82 to 98 degrees. AUMA rates the service life at 1,000 OPEN-STOP-CLOSE cycles over a swing of 90 degrees in the temperature band from -25 to +80 degrees Celsius.

Engineering Design of the AUMA GHE 12.1

The mounting face is an F12 flange cast into the housing in line with EN ISO 5211; for F14 an intermediate flange is added, which can call for a longer coupling. Machining of the coupling accepts 50 mm round shafts, 36 mm square ends or 41 mm two-flat ends, and the gearbox can be turned on the coupling in four 90-degree positions.

A polyamide handwheel is standard; ball-handle wheels and bronze operating elements per VG 85081 (version A, or version B with an extra ball element) are available. Sealing is IP67 with an IP68 upgrade; corrosion class KN applies, with KM for bronze parts in seawater.

Size Position of the AUMA GHE 12.1 Within the GHE Series

The AUMA GHE 12.1 tops the GHE series, as the AUMA data sheet figures below show.

Both rows share the 80:1 ratio, the 20 input turns for 90 degrees and the 1,000-cycle service life.

Key Features

The AUMA GHE 12.1 gives heavy handwheel-operated quarter-turn valves a reliable self-locking drive:

• Up to 1,000 Nm at the valve from about 40 Nm at the handwheel.
• The 80:1 ratio keeps the factor near 25 and the input at 20 turns for a quarter turn.
• An F12 flange in the housing is joined by F14 through an intermediate flange.
• The coupling can be machined for 50 mm round, 36 mm square or 41 mm two-flat shafts.
• A self-locking worm drive holds the valve, and the pointer shows position continuously.
• A spheroidal cast iron body is offered with a bronze alloy option.
• At 13 kg without coupling and operating elements it is the heaviest of the four GHE sizes.
• IP67 is standard and IP68 optional, with 1,000 operating cycles documented.

Industrial Applications

Larger butterfly valves in water distribution, ball valves on fuel and utility headers and plug valves on low-frequency lines are where the AUMA GHE 12.1 earns its place. Pump stations, desalination post-treatment and district-cooling branches along the Omani coast use handwheel gearboxes of this kind, and the bronze variant is a natural fit for marine conditions.

In Oman and the GCC, Seven Star LLC supplies the GHE 12.1 to contractors, valve builders and 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 motor-driven part-turn gearboxes, the AUMA SA 10.2 multi-turn actuator for actuator duty and the AUMA SAR 14.1 modulating actuator for modulating service.

Related pages on our site: AUMA GHE 07.1 and AUMA GHE part-turn worm gearbox family.

Technical Specifications

The GHE sheet lists four sizes; the table below gives the AUMA GHE 12.1 values.

With about 40 Nm needed at the handwheel for the full 1,000 Nm, check the hand force available at the valve and consider a larger handwheel or a motorised alternative for frequent duty.

Handwheel Effort and Operating Time with the AUMA GHE 12.1

Handwheel gearboxes are judged by the effort they demand from the operator. The AUMA GHE 12.1 turns a full 1,000 Nm valve load into about 40 Nm at the input shaft, and a simple lever calculation shows what that means on a 250 mm handwheel: 40 Nm divided by a 0.125 m radius is a rim force of roughly 320 N, which one person can sustain for a quarter turn. Twenty handwheel revolutions complete the 90-degree swing, so an operator turning at one revolution per second needs about twenty seconds, which is why the GHE 12.1 suits valves that are operated infrequently and without time pressure. Because the worm drive is self-locking, the handwheel can be released at any point of the stroke without the valve drifting, and the end positions are limited by the fixed 82 to 98 degree swing window of the gearbox.

Request a Quote for AUMA GHE 12.1

For the AUMA GHE 12.1, send Seven Star LLC the valve torque, flange and shaft dimensions. Our team confirms the gearbox, any coupling machining and the handwheel variant, supplies the AUMA data sheet that can be downloaded on this page and arranges delivery. As a supplier of AUMA products for Oman and the GCC we provide a quotation and the manufacturer datasheet for every gearbox.