Air-open and air-close of the position control valve

2011-05-24View Original

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Is there a specified time limit for how long a position-regulating valve can maintain its position in the event of an accident? Are there terms like FO and FC as well? How to understand that a position maintaining control valve is a air-operated valve? What do FL/SO stand for?

Reply #22011-05-24

I’m not quite sure about this; there should be some regulations, right?

Reply #32011-05-24

It’s possible; simply by switching the air inlet, it can be made to operate on an air-on/air-off basis.

Reply #42011-05-25

Reply to 1# Melon Seeds: Maintaining a position is unreliable; it can only last for a while.

Reply #52011-05-25

It can be FO, FC, FL – as long as the corresponding electrical components are available

Reply #62011-05-25

Maintaining a position can only be done for a while; FL means maintaining that position

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Air-open and air-close of the position control valve

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