butterfly valve/actuator installation
butterfly valve/actuator installation
(OP)
Greetings to all on the forum.
I have a rotary actuator on a butterfly valve. The installation is air to open, fail closed and it does indeed work. The groove or line on the stem of the actuator is across the pipe. The red indicator around the stem has two white dots inline with the pipe.
Question 1: Looking only at the actuator stem and indicator, would you say the valve connected below is open or closed?
Question 2: Would you consider this installation acceptable?
Thanks for all replies!
I have a rotary actuator on a butterfly valve. The installation is air to open, fail closed and it does indeed work. The groove or line on the stem of the actuator is across the pipe. The red indicator around the stem has two white dots inline with the pipe.
Question 1: Looking only at the actuator stem and indicator, would you say the valve connected below is open or closed?
Question 2: Would you consider this installation acceptable?
Thanks for all replies!





RE: butterfly valve/actuator installation
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RE: butterfly valve/actuator installation
This situation really asks the question when looking at a valve/actuator installation, do you look at the groove or flats on the actuator stem or the plastic flow indicator to determine valve position? In this installation, the installer turned the actuator from vertical to horizontal. Now the groove (or line) on the stem, disagrees so to speak with the valve stem. When the groove is now across the pipe, the valve is open, when parallel to the pipe, the valve is closed. The installer simply turned the red indicator to show valve position.
I think the groove or flats on the actuator stem should show valve position just like the groove or flats on the valve stem. Simply turning the indicator in unacceptable, amateurish and dangerous. To me, the groove or flats on ANY stem are, or should be an indication of valve position. Others, including some journeyman fitters say no, the groove or flats on the actuator stem are only there to drive a micro-switch, or other type of indicator.
What say you? Thanks!
RE: butterfly valve/actuator installation
RE: butterfly valve/actuator installation
RE: butterfly valve/actuator installation