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http://www.shinjovalve.com/news/iso-5211-mounting-pad-flange-dimensions.html

The ISO 5211 mounting pad accepts direct mounting of pneumatic and electric actuators. Commonly ball valve and butterfly valves are now standard with an ISO mounting interface. This simply means that you can mount the actuator directly to the valve without a bracket and drive dog. This saves time, hassle and money. The below shows the dimensions for ISO5211.