AUMA LE 12.1 Linear Thrust Unit (11.5 kN)

Overview

AUMA LE 12.1 is the smallest of the six AUMA linear thrust unit sizes. It converts the output torque of an AUMA SA 07.2 multi-turn actuator into axial thrust of between 4 and 11.5 kN, so that a globe valve, a control valve or another rising-stem valve can be driven linearly without a part-turn or multi-turn stem arrangement. Five stroke lengths from 50 to 500 mm and weights from 8 to 14 kg make it the lightest and most compact way of automating small linear valves with AUMA equipment.

In Oman and the GCC, Seven Star LLC supplies the AUMA LE 12.1 with SA 07.2 or SAR 07.2 actuators to industrial, water and power customers throughout the Sultanate of Oman and the GCC. We confirm stroke, thrust window and stem thread against the valve data sheet before ordering, so that the linear unit arrives matched to the valve and the actuator.

Working Principle of the AUMA LE 12.1

The AUMA LE 12.1 turns rotation into straight-line force with a self-locking threaded spindle. The SA 07.2 spins the drive nut and the coupling stud passes the push or pull to the valve stem. AUMA’s factor for this size is 2.6 (Nm of torque per kN of thrust at an adhesion factor of 0.15), the standard closing direction extends the stem when the actuator turns clockwise, and a retracting version is optional.

In combination with the SA 07.2 the LE 12.1 provides a minimum thrust of 4 kN and a maximum thrust of 11.5 kN, with exceptional thrust up to 23 kN permissible; with the SAR 07.2 for modulating duty the minimum is 6 kN, the maximum is 11.5 kN and the thrust for modulating torque is 5.8 kN. At actuator speeds from 4 to 32 rpm the stem speed ranges from 20 to 160 mm/min, and a 45 rpm actuator, which is the maximum permissible speed, gives 225 mm/min.

Engineering Design of the AUMA LE 12.1

The valve attachment is a flange according to DIN 3358 as standard, with a base without valve mounting flange and a spring-loaded version as options. Input mounting of the SA 07.2 uses the F07 or F10 flange, and the valve stem thread is 26 x 5 left-hand. Weights are 8 kg for the 50 mm stroke, 9 kg for 100 mm, 10 kg for 200 mm, 13 kg for 400 mm and 14 kg for 500 mm, excluding the actuator and the base.

Housing protection is IP67 with a KS finish, and the temperature window is -25 to +80 degrees Celsius with hot and cold variants on request. The duty rating is S2 for 15 minutes, and AUMA advises that full load applies only briefly while the valve opens or closes.

Stroke and Weight Options of the AUMA LE 12.1

The AUMA LE 12.1 is available in the following stroke lengths, which AUMA lists with their approximate weights.

Higher strokes are available on request, and the weight excludes the multi-turn actuator and the base.

Key Features

The AUMA LE 12.1 is the entry point to AUMA linear valve automation:

• Thrust window of 4 to 11.5 kN in open-close duty, with 23 kN permissible in exceptional cases.
• Stroke lengths of 50, 100, 200, 400 and 500 mm.
• Driven by the SA 07.2 (open-close) or SAR 07.2 (modulating) multi-turn actuator.
• 26 x 5 left-hand valve stem thread with a conversion factor of 2.6 from torque to thrust.
• F07 and F10 attachment and a DIN 3358 valve flange as standard.
• Stem speeds from 20 to 225 mm/min depending on actuator speed.
• Weights from 8 kg for the shortest stroke to 14 kg for the longest.
• Self-locking drive, IP67 enclosure and KS corrosion protection.

Industrial Applications

Small globe valves on steam, condensate and chilled-water lines, linear control valves on process skids and slide valves in dosing systems are typical applications of the AUMA LE 12.1. The 4 to 11.5 kN thrust window suits light linear valves, and the long stroke options up to 500 mm suit sliding-stem valves in industrial and building-services plants around Muscat and Sohar, where a pneumatic actuator is not preferred.

In Oman and the GCC, Seven Star LLC supplies the LE 12.1 with SA 07.2 and SAR 07.2 actuators to contractors and plant operators across Oman and the GCC, including the Salalah economic zone. Engineers can review the AUMA LE linear thrust unit family page, the AUMA SA 07.2 multi-turn actuator that drives it and the AUMA SAR 14.1 modulating actuator.

Related pages on our site: AUMA PROFOX-L compact smart linear actuator.

Technical Specifications

Principal data for the AUMA LE 12.1 follow, taken from the LE 12.1 to LE 200.1 open-close sheet.

Because T = F x 2.6, thrust of 4 to 11.5 kN corresponds to roughly 10 to 30 Nm at the SA 07.2, and strokes above 500 mm are available on request.

Choosing Stem Speed and Thrust Settings for the AUMA LE 12.1

Because the AUMA LE 12.1 is a spindle drive, stem speed follows directly from the speed of the SA 07.2: 4 rpm gives 20 mm/min, 5.6 rpm gives 28, 8 rpm gives 40, 11 rpm gives 55, 16 rpm gives 80, 22 rpm gives 110, 32 rpm gives 160 and the 45 rpm limit gives 225 mm/min. A 100 mm stroke therefore takes five minutes at the slowest speed and about 38 seconds at 160 mm/min, while the longest 500 mm stroke needs roughly two minutes even at 225 mm/min. Specifying the right speed is the first design decision for the AUMA LE 12.1, because slower ratios allow gentler seating and faster ratios shorten emergency closing times. The second decision is the thrust setting: AUMA states a tolerance of plus or minus 20 percent on thrust for the minimum and maximum torque switch settings, so the 4 kN lower limit and the 11.5 kN upper limit should be treated as a band, not as exact values, when you check valve seating loads.

Request a Quote for AUMA LE 12.1

Request a quotation for the AUMA LE 12.1 by sending Seven Star LLC the valve stroke, the thrust requirement, the stem thread and the duty type. We will confirm the actuator pairing, attach the AUMA technical data sheet that can be downloaded from this page and advise on stock and lead time. In Oman and the GCC, we supply linear units on request, with lead time confirmed at quotation.