Control systems
4
SECTION 4
4.1
Control valves
4.2
Pneumatic actuators
4
4.3
Electric actuators
4.4
Positioners and controllers
4.5
Self-acting controls
4.6
Pressure reducing/surplussing valves
4.7
Safety valves
4.8
Desuperheaters
4.9
Magnetic level indicators
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