Fame for M2 at last!

[m2xt]

Fame for M2 at last!

Alan,

Ive based my calcs on the figures published on the valve. The valve is an Italian Bonomi stainless steel ball valve type 703000 with iso pad. It has identical kv performance figures as their 704000 range. The DN25 size is quoted as having a kv of 43 hence my comparisons. I cannot find anything on-line that shows this but I have a hard copy of their catalogue. They do have a UK subsidery in Nuneaton, if this helps as I know you know your way around the internet.

I dont know whether your sums are right or wrong other than CV is 1.17 x kv.

Paul

[big_nipper]

Fame for M2 at last!

Dont know much about flow rate calcs but i thought the old M2 was a good enough flipper (Flipped us out at the first Robodome Brighton event) and the only weakness was the armour. But this new one looks and sounds like it will be alot better. Looking forward to meeting it in action.

Ive seen this system of low pressure cylinder opening a high pressure valve during the winter tour and its bugging me as to which robot it was. Judge Shred springs to mind but not sure.

[blazerbotics]

Fame for M2 at last!

Judge shred uses that system, were using it on Wizard as well (save the cost of 2 burkerts). Most FP systems used it in the early (big Bro, Chaos 2, Steg 2, Thermador ect) days before Burkerts were discovered.

[woody]

Fame for M2 at last!

I have uploaded a chart on my profile showing approx Kv values for a given orifice size.

[m2xt]

Fame for M2 at last!

I think I can see what is happening now, your Kv chart is for globe valves. If I remember my apprenticeship correctly as its a long time ago, a globe valve has two 90 degree changes in flow direction. This results in a greater pressure drop hence a lower Kv. My valve is straight through with no changes in flow direction and no intrusions into the flow stream, thus no turbulence hence high flowrate. You can get different Kv figures for similar bored valves depending on the internal finish such as seam welded tube against PTFE lined tube. The Technobots 1 solenoid valve with its similar changes in direction has a Kv of 180 l/m (which matches your chart exactly).

You had started to put doubts in my mind but now I can why there is this difference between your figures and mine.

Paul

[Mouldy]

Fame for M2 at last!

The new setup looks great, Best of luck with a great looking new bot Paul

[babeth]

Fame for M2 at last!

I can only say that we are eagerly looking forward to the first runs Paul ! Your machines are often a marvel to behold.

Karoline, you would be amazed at what Mario keeps track off. (Usually at this point the average Dutch roboteer yells I dont wanna know !!... I wonder... Are the English mentally sturdier ?)

[andrewj]

Fame for M2 at last!

I dont wanna know! :P

Looking great so far.

[woody]

Fame for M2 at last!

I did realise that it was for globe valves ....but as yet I cannot find a Kv chart for a straight thru full bore ball valves.

I have a Cv chart for holes of varying dia.
http://www.teamonslaught.fsnet.co.uk/flow.gifhttp://www.teamonslaught.fsnet.co.uk/flow.gif

I also thought that flow and the cross sectional area of the hole had a linear type relationship...I.E. A 4 bore would flow 4 times as much as a 2 bore seeing as how the cross sectional area is 4 times as much?

Im not sure that I have my facts right and it really matters not... your flow is more than enough to flip an opponent.

[m2xt]

Fame for M2 at last!

Thanks for all of the kind comments, 2004 was a poor year roboting wise for us but loads of enthusiasm now what with a new heavy and a few Zeobots as well.

Alan, I found this which gives the Cv for various types of valve including ball valves - http://www.plastomatic.com/calc.htmlhttp://www.plastomatic.com/calc.html

[woody]

Fame for M2 at last!

Tah!

[philip_taylor]

Fame for M2 at last!

Paul, would you please tell me what you used for the walls of your ram in M2XT and the wall thickness?

[stu]

Fame for M2 at last!

Philip you will have to email Paul as he no longer uses the forum.

Mr Stu

[philip_taylor]

Fame for M2 at last!

Thanks, Stu.

[grafix]

Fame for M2 at last!

arialhelvetica>{}}Vote Paul for King!!