Valve Control

[2011FRC1322]

<r74> Each commanded motion of a pneumatic cylinder or rotary actuator must be accomplished via the flow of compressed air through only one approved pneumatic valve. Plumbing the outputs from multiple valves together into the same input on a pneumatic cylinder is prohibited.

I read this as meaning that we can not use multiple valves on a cylinder. But I do not see where I can not use multiple cylinders on a vavle.

On the inspection checklist it says it different.

“ Valve Control – pneumatics solenoid valve must have Cv of 0.32, be controlled by either Spike or NI 9472 and only one valve Per pneumatic actuator. <r66.b, r74>

"one vlave Per Pneumatic actuator"

Which is correct ?

[GDC]

They are both correct. Rule <R74> and the 2011 Inspection Checklist require (1) valve per pneumatic cylinder, but do not place requirements on how many pneumatic cylinders may be connected to a single valve.