Process-Valve icon color

["Paul Sichta" <psichta@pppl.gov>]

Dear all,
I have a question regarding the color-code of process valves on our operator
displays.  The traditional practice (here at  PPPL) has been that a green
valve icon indicates an open valve (flow) and a red valve indicates a closed
valve (no flow).  I believe (but am not sure) that this is the opposite of
industrial/nuclear industry convention.

In order to convince people here that we are not doing what the rest of the
industry is doing,   I'd like to quote an ANSI/ISO/DIN standard.  I have not
found any standards online (there are lots I can order) clarifying this
issue.

1)  What is the correct convention ?
2)  What color convention are you using ?
3)  Would someone post the number of a standard & subsection  which
specifies the correct code ?

-ps