ISA 75.25.01-2000 (R2010)

Defines the testing and the reporting of step response of control valves that are used in throttling closed loop control applications, as well as methods and criteria for performing response tests and evaluating test results for three alternative environments: bench testing, laboratory testing, and in-process testing. This standard does not define the acceptable control valve performance for process control nor does it restrict the selection of control valves for any application.