1. Indelac Controls Inc. (2014) How to select an actuator. Comprehensive Guide. http://www.indelac.com/pdfs/How-to-Select-an-Actuator-Comprehensive-Guide.pdf. Accessed 20 July 2018
2. Flowserve (2018) Valve actuation: the when, how, and why of actuator selection. https://www.flowserve.com/sites/default/files/2018-05/(FLS-VA-EWP-00005-EN-EX-US-0518-Actuation_Type_Advantages_LR1.pdf. Accessed 20 July 2018
3. Metalphote of Cincinnati (2018) How to select a valve actuator: types of valve actuators, appropriate sizing, safety criteria, and more. https://www.mpofcinci.com/blog/how-to-select-a-valve-actuator/#Function. Accessed 20 July 2018
4. American Petroleum Institute (API) (2012) Standard for actuator sizing and mounting kits for pipeline valves. API 6DX, 1st edn. API, Washington
5. International Organization for Standardization (ISO) (2011) Petroleum and natural gas industries—mechanical integrity and sizing of actuators and mounting kits for pipeline valves. ISO 12490, 1st edn. Switzerland