AUMA SA 14.6 Multi-Turn Actuator

Overview

AUMA SA 14.6 is an AUMA NORM multi-turn actuator for open-close duty with a tripping-torque window of 200 to 500 Nm and 12 output speeds from 4 to 180 rpm. SA 14.6 takes the F14 interface of the SA 14.2 and doubles the available torque to 200 to 500 Nm. It is the right choice for stiff gate valves and large globe valves that must stay on the F14 flange, with a 400 mm handwheel that keeps the manual effort acceptable.

The SA 14.6 is supplied by Seven Star LLC, a trusted AUMA supplier for Oman and the GCC, with the correct documentation and a regional contact for commissioning.

Operating Principle

Inside the SA 14.6, the motor turns are counted to define the OPEN and CLOSED end positions, and the torque switches release at the preset value of up to 500 Nm in each direction. Short-time duty S2 – 15 min applies as standard, and the self-locking range reaches 90 rpm.

Engineering Design of the AUMA SA 14.6

The S2-15 min rating is stated for 35 percent of maximum torque load at 40 degrees Celsius ambient, so a stiff valve operated frequently in a hot Gulf plant room should be checked against the S2-30 min value of 360 Nm, or against a larger frame, rather than run at the limit of its short-time rating.

Key Features

Specifying the AUMA SA 14.6 comes down to these points:

• High-torque F14 multi-turn actuator.
• Choose any trip value between 200 and 500 Nm; the span from smallest to largest setting is 2.5 to 1.
• Switching to S2 – 30 min duty reduces the ceiling to 360 Nm (72 percent of the maximum).
• Each kilogram of actuator mass corresponds to about 9.4 to 10.9 Nm of maximum torque.
• An illustrative stroke of 36 turns takes about 67.5 seconds at 32 rpm.
• Torque class: between the SA 14.2 (below) and the SA 16.2 (above).
• For dimensions and wiring data, refer to AUMA’s dedicated sheets for this size.

Selecting the AUMA SA 14.6

Because the SA 14.6 shares its F14 flange and 58 mm stem capacity with the SA 14.2, the valve interface does not change when the torque requirement rises: only the actuator size does. The weight moves from 44 to 48 kg to 46 to 53 kg, while the handwheel grows from 315 to 400 mm. The trade-off is the 200 Nm minimum tripping torque; a valve that closes at 120 Nm should be paired with the SA 14.2 so that the torque switch can be set meaningfully close to the real seating load.

Typical partners are large wedge-gate valves under high differential pressure, large globe valves on steam and condensate lines, big pump-discharge isolation valves, and heavy rising-stem sluice gates and penstock-type slides in water works.

At the 200 to 500 Nm level the quality of the valve stem becomes visible in the actuator settings. A bent or corroded stem can double the running torque, and the AUMA SA 14.6 will faithfully trip on the elevated reading. Before commissioning on an existing valve, stroke it by handwheel and feel for tight spots, and fit a stem protection tube if the stem passes through the actuator. Before ordering, also record the stem thread pitch and the number of turns per stroke from the valve data sheet, because the limit-switching counter of the control unit must cover the full travel and the stroking time depends directly on the turns required.

Sizing example for the AUMA SA 14.6

Imagine an illustrative valve that needs 320 Nm to break away and 180 Nm to run in service. A 25 percent margin gives a tripping setpoint of about 400 Nm, which is inside the 200 to 500 Nm window of the AUMA SA 14.6 and equal to the 400 Nm available at 180 rpm in S2-15 min duty. At 125 rpm or below the full 500 Nm remains available. A 30-turn stroke at 22 rpm takes about 82 seconds and at 63 rpm about 29 seconds. These numbers are an illustrative calculation and not AUMA data.

Installation and Mounting of the AUMA SA 14.6

The 46 to 53 kg mass of the AUMA SA 14.6 calls for a hoist or lifting eye when the valve is on a pipe rack. The F14 flange is identical to the SA 14.2, so valve brackets designed for one size generally take the other, but the 400 mm handwheel needs more swing clearance than the 315 mm wheel of the smaller size. When the valve stem rises through the actuator, make sure the stem protection tube and the stem length are specified with the order.

Industrial Applications

In Omani industry the AUMA SA 14.6 appears on boiler-feed and condensate isolation valves, on cooling-water inlet valves at independent power plants along the Batinah coast, and on high-pressure water-injection lines supporting upstream oil operations in the interior. Municipal water utilities specify it on trunk-main gate valves where the actuator has to overcome the high breakaway torque of a valve that is operated only a few times per year.

For related projects, a trusted supplier of AUMA products Seven Star LLC offers the AUMA SA 07.2 multi-turn actuator, the AUMA MATIC AM/AC integral actuator controls and the AUMA SAEx explosion-proof actuator in Oman and the GCC.

Neighbouring sizes and counterparts: AUMA SA 14.2 multi-turn actuator and AUMA SA 16.2 multi-turn actuator.

Technical Specifications

Data of the AUMA SA 14.6 from the AUMA technical data sheet for 3-phase AC motors.

Setpoint guide for the SA 14.6 (illustrative calculation, not AUMA data)

Stroking time for 36 turns at the SA 14.6 (illustrative calculation, not AUMA data)

Request a Quote for AUMA SA 14.6

Contact Seven Star LLC to buy the AUMA SA 14.6 in the 200 to 500 Nm class. Please share valve data, ambient conditions and controls, and download the AUMA datasheet from this page.