Are Safety Valves, Regulators And Isolating Valves All Examples Of Control Valves?

Normally the term control valve is used to describe a valve that controls flow with an externally adjustable variable restriction. Safety valves and isolating valves should not be referred to as control valves without a qualifier such as safety control valve or on/off control valve. Regulators should be referred to as self-regulating control valves to avoid confusion.