Use of Samson solenoid valves
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When a Samson solenoid valve is used in conjunction with a control valve, why is it necessary to connect an external pilot? Could someone explain this?
It depends on the type of solenoid valve you have, as well as the sequence in which the air lines are connected. What is the purpose of using both a valve and a solenoid valve? Adjust as well as cut off? What you said is very vague; it would be better if you had photos
If your pneumatic circuit includes both a positioner and a solenoid valve, with the solenoid valve connected to the air line coming out of the positioner, then this solenoid valve must be of the direct-acting or externally piloted type; it must never be an internally piloted type. This is because, in the case of an internally piloted solenoid valve, when the output pressure from the positioner is relatively low, it may cause the solenoid valve to switch states. So, returning to your question, it’s not necessarily necessary to use an external pilot; rather, it’s essential to use a direct-acting type or an external pilot