Re: Pneumatic Solenoid source
 

Hmm... The Festo solenoid valve (#566475) found on FIRST Choice is also M7, according to the datasheet...
http://www.usfirst.org/uploadedFiles...o%20566475.pdf

Re: Pneumatic Solenoid source
 

Technically yes. They are not the valve provided in the KOP and they flow more than .32cv

This would be a good question for the GDC.

I will ask.

Re: Pneumatic Solenoid source
 

Hang on a second, facts need to be checked.

Yes, the larger fittings let them flow higher, but it is still legal, please see below.

#566475 uses 24 volts and was provided in the FIRST Choice program. #564212 uses 12 volts and can be purchased at AndyMark.

No, they don't flow more than 0.32 Cv. These valves flow at 0.22 Cv, or 220 l/min. The rule <r66> B talks about the flow rate of a SOLENOID VALVE to be limited to 0.32, not a FITTING.

These valves are legal, in my opinion.

Andy Baker

Re: Pneumatic Solenoid source
 

A team goes to a regional.
The inspector sees the part number on the valve or BOM and notes that it is different from the part number on the inspection sheet.
He asked for documentation to prove the Cv and the team shows him the Festo data sheet.
No where on that sheet is Cv listed, he says show me the Cv number
They show him the data sheet for the M5 that lists the flow rate of 150-220 l/pm and they tell him Andy Baker says that means .22cv
He takes them on faith and says OK show me the data sheet on the M7.
That sheet says a flow rate of 190-380 l/pm.
The inspector says,well according to what you said that means that the rate is .38cv and not legal for FIRST use.
What should that inspector do?



I have asked for clarification from the GDC.

Re: Pneumatic Solenoid source
 

Andy,

I just ordered 5 valves from you (thanks for the price break from Festo list prices for my volume level), please make sure they are legal or I will have to either send them back or be very upset with wasting $560.

Re: Pneumatic Solenoid source
 

Please remember that what I say means absolutely nothing. It is totally just my opinion.

I will be absolutely shocked if the GDC rules against valves that were included in FIRST choice. My prediction would be a simple updated to the rules specifically mentioning these valves.

My only point is to clarify the issue to make inspectors job and teams lives easier.

Re: Pneumatic Solenoid source
 

This pneumatic issue is out of control. We can get a great price on solenoids and they meet the .32 CV. however the fine print of the data sheet shows they only meet this if they are mounted on a very specific manifold. On a single manifold the are .42CV. This puts an unreasonable burden on the inspectors. I could show a data sheet to an inspector and get away with .42 CV. Only if the inspector was very into pneumatics would they ever suspect I was cheating.

Re: Pneumatic Solenoid source
 

Here is a nice article, written jointly by representatives from Festo, Numatics, and Parker. It describes how Cv is measured in non-consistent ways.

Andy B.

Re: Pneumatic Solenoid source
 

Ask and you shall receive. Thanks for the clarification GDC.

From update #11

The 2011 Kit of Parts Checklist, Rev E has been updated to include VUVG-L10-B52-T-M7 as an alternate part number for the FESTO valves delivered in the Kit of Parts. There were two part numbers shipped for use in kitting and this revision allows teams to use either or both valves on the ROBOT.