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Control valve ISA representation

Control valve ISA representation

Control valve ISA representation

Dear Sirs,

Regarding to the las ANSI/ISA-5.1-2009, I need to represent hydraulic control valves, which are Bermad, models:

This valve will be commanded by three solenoid valves, 24 VDC: two solenoids are for opening and closing the valve, and the third solenoid is for allowing the electric operation of the valve (the two first solenoids), in other words the third solenoid change the valve operation in electric mode (by solenoids) or hydraulic mode (self regulating).

The same control valve model could be used for level and flow control, as explained in the information of the manufacturer.

I have a initial idea for representing this control valve by a self-regulating valve symbol and a bubble indicating the main control operation: FCV or LCV.
In order to represent the control solenoids, I would represent three small bubbles for each solenoid, but I´m not shure the indication of each one. It could be:
Open solenoid: XSO
Close solenoid: XSC
Hydraulic / electric operation: XSX

Other option could be:
Open, close and operation mode solenoids: XY

Please advice in your experience for the most close representation.
Thank you in advance for your help.

Best regards,

Luis A. Cristóbal V.

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