Multi-turn gearboxes for operation or automation of gate and globe valves Bevel gearboxes GK 10.2 – GK 40.2 Spur gearboxes GST 10.1 – GST 40.1 Torques up to 16,000 Nm Product description

2 | Applications AUMA multi-turn gearboxes are used wherever multi-turn valves have to be operated, e.g. gate valves in any possible design. They are suitable for both manually operated and motor driven valves. Due to the large torque range available, their modular design and potential for use with electric multi-turn actuators, the gearboxes can be used for the most varied applications. Power : Conventional power plants (coal, gas, oil) : Hydroelectric power plants : Geothermal power plants : Solar thermal power plants : Biogas power plants Water sector : Sewage treatment plants : Water treatment...

| 3 Solutions for a world in motion Subject to change without notice. The product features and technical data provided do not express or imply any warranty. 2011-01-19 This brochure will provide both beginners and experts with a perfect overview of the functions and applications of AUMA GK and GST multi-turn gearboxes. It can be used as the basis to determine whether a device is suitable for the chosen application. For detailed product selection refer to the separate data sheets and price lists. On request, AUMA engineers within field service and within our subsidiaries can help you find the...

4 | Modular design/versions Modular concept - manual or motor operation Depending on the application, gate valves and globe valves with diameters ranging from a few centmetres to several metres are to be opened or closed and controlled either manually or electrically. AUMA meets the various requirements with their flexible and modular product range. The GK and GST multi-turn gearboxes offer a number of adaptation possibilities due to their variability. Moreover, they can easily be combined with other AUMA products. Manual operation For manually operated gate and globe vales with high torque requirements...

| 5 [1] GK bevel gearbox with handwheel [2] GST spur gearbox with handwheel The designations bevel gearbox or spur gearbox refer to the gearbox design principle. [3] Multi-turn actuator/bevel gearbox combination SA/GK [4] Multi-turn actuator/spur gearbox combination SA/GST Torques up to 16,000 Nm Contrary to the version for manual operation, the gearbox input includes a mounting flange for the actuator. The multi-turn actuator is mounted with a screw connection to the gearbox which can easily be removed for maintenance purposes. The flange connection between multi-turn actuator and gearbox meets...

6 | Summary of applications, functions, and equipment Standard œ Option ¡ GK 10.2 – GK 40.2 GST 10.1 – GST 40.1 Page Applications/duty types Manual operation œ œ 4 Motor operation ¡ ¡ 4 Open-close duty œ œ 4 Positioning duty œ œ 4 Modulating duty ¡ ¡ 4 Service conditions Enclosure protection IP 67 œ œ 8 Enclosure protection IP 68 ¡ ¡ 8 High temperature version ¡ ¡ 8 Low temperature version ¡ ¡ 8 Corrosion protection KN œ œ 9 Corrosion protection KS, KX ¡ ¡ 9 Explosion protection ¡ ¡ 9 Functions Reduction of input torques œ œ 10 Adaptations to special mounting conditions œ œ 11 Automating double-stem...

| 7 Design principle GK 10.2 – GK 25.2 [1] [2] [3] [4] Bevel gear Within a single stage, this type of gear adjusts the effective direction of the input torque by 90°. Ideal for actuating valves where access is difficult (in combination with an AUMA SA multi-turn actuator). [5] Spur gear This gear type is easy to install and of robust and cost-effective design. A small actuator and spur gearbox combination is often less expensive than a larger multi-turn actuator. It has to be verified whether the increased operating time caused by the additional reduction is acceptable. The combination between...

8 | Service conditions Enclosure protections IP 67 AUMA bevel and spur gearboxes conform to enclosure protection IP 67 according to EN 60 529. IP 67 means protection against immersion up to max. 1 m head of water for max. 30 minutes. IP 68 Upon request, AUMA bevel and spur gearboxes are available with improved enclosure protection IP 68 according to EN 60 529. IP 68 means protection against submersion up to 6 m head of water. Ambient temperatures Versions Temperature range1 Standard – 40 °C…+ 80 °C Options 0 °C … + 120 °C – 60 °C…+ 60 °C 1 If a gearbox is used in combination with a multi-turn...

| 9 Explosion protection For the installation of valve gearboxes in potentially explosive atmospheres, special protective measures are required. AUMA gearboxes are approved for installation in potentially explosive zones. They comply with the regulations stipulated in European standard EN 13463-1 et seqq. AUMA certifies this in a declaration of incorporation. Classification of explosion protection ¡ II2G c IIC T4 according to ATEX 94/9/EC Corrosion protection/colour Standard (KN) The standard AUMA corrosion protection KN is a high quality coating. This is suitable for outdoor installation and...

10 | Functions It seems somewhat overdone to talk about features when considering gearboxes with a relatively basic design. In particular when using gearboxes with manually operated valves, the operation task is limited to providing a reduced rim pull. However, the gearbox characteristics may not be considered alone. Customised automation solutions can be implemented when combining the gearboxes with AUMA multi-turn actuators. Reduction of input torques If the valve requires manual operation, the applicable rim pull should not exceed the limits stipulated in EN 12 750. These limit values can...

| 11 Adaptations to special mounting conditions GK bevel gearboxes and GST spur gearboxes with a reduction ratio 1:1 are available for smaller torques up to 120 Nm, to find a solution for special installation applications. The GST gearbox shifts the multi-turn actuator out of the valve stem axis. In the case of restricted access, this option allows free access to the actuator handwheel. Depending on the conditions on site, the GK might turn out to be the ideal solution. You may also combine GK and GST gearboxes or align several GK gearboxes one after the other. This multiplies the possible solutions....