What cables are referred to as control valve instruments and on-off valve instruments in the self-control installation manual?
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Xiaobai is seeking help! The installation manual for self-control systems contains diagrams showing the continuous protection connections for the cables of control valve instruments and two-position valve instruments. What exactly do these terms – control valve instruments and two-position valve instruments – refer to?
Control valve instruments refer to control valves, which are valves that can be adjusted continuously over a range of 0–100% travel. Two-position valves are cut-off valves, typically pneumatic valves, as well as solenoid direct-acting valves or electric on/off valves
I didn’t understand your question. Control valves generally use intrinsically safe cables, while two-position valves usually use explosion-proof cables