Adaptors and fittings for full pressure flipper

[geeza]

Suppose never thought of that.

[evristow]

@Woody,

Thanks for the link, that is the only small manual valve I've seen to 1000PSI! I guess the robot will have one NPT more... I also found some Parker compression fitting valves rated to 1000PSI, namely the MB Series, although nowhere sells them.

The SPRV comes factory setted to 1000PSI (+-50), I think they can send a certificate stating that, will that be sufficient?

@geeza,

I found several valves G1/4, the problem is their size.

@all,

Does any one knows if there exist an 5/8-18 UNF to G1/2 BSP adaptor?

Since the arm and ram are bolted to the mechanism bars, does a 4 four bar mechanism need a tether?

Cheers,
Eduardo

[evristow]

I am really thinking about reverting all the threads of the project to NPTF. The CGA320 adapter is 1/4 NPTF, the Wizard of NOS SPRV is 1/8 NPTF, the gauge that I will have to use on RFL events is 1/8 NPTF and the dump valve looks like is going to be 1/8 or 1/4 NPTF also...

The Dump valve will probably be savaged from a Paintball refilling station that I bought last year, the valve is pretty small 51 x 28 x 48 and can handle 65BAR, one alternative is to use a NPTF 1/4 Male to G1/8 female adaptor from Burnet and Hillman to convert it.

The other dump valves options are:

-Parker MB or B PR Series (with compression fitting tubes):
http://www.fluidcontrols.co.uk/valves/ball-valves
-Aerohydraulics 1/8BSPP High Pressure (I don't have any information about size or weight, but there is G1/8 option):
http://www.aeroindustrialproducts.co..._p-99-438.html
-Legris 4730 - 2way Female BSPP Thread G1/8 100BAR - 4730 04 10 22 (A bit heavy... 350g):
http://legris-autoline.com/Legris_ec...hoisis=1_G1/8@
-Mars One Piece Reduced Bore Stainless steel Ball Valve G1/4 (Only 70g and as small as the aforementioned paintball refilling station):
http://www.valves-online.co.uk/acata...all-Valve.html

Today three CGA 320 to 1/4 NPTF adaptors, one anti-syphon tube (the main tank will be almost horizontal to keep height low) and two paintball on-off valves and the 1500 PSI dye gauge arrived. Just waiting for the two 16oz bottles from Pure Energy (75 x 205mm).

The paintball on-off valves from JustPaintBall.co.uk have a smaller bore than I thought, maybe this will be useful to prevent bottle freezing, although I will search for other alternatives, any suggestions?

Cheers,
Eduardo

[woody]

The SPRV comes factory setted to 1000PSI (+-50), I think they can send a certificate stating that, will that be sufficient?

IMO yes.

Since the arm and ram are bolted to the mechanism bars, does a 4 four bar mechanism need a te

IMO no.

Does any one knows if there exist an 5/8-18 UNF to G1/2 BSP adaptor?

Well you could consider drilling out the existing paintball valve to 8mm ... CGA 320 is very close to 1/2 bsp apart from the thread angle.

or
http://www.thinkauto.com/acatalog/On_li ... __162.html

MMS9-8-7
1/2BSP x 5/8UNF- steel
£2.57 (Excluding VAT at 17.5%)


ball valve ..

http://www.hydrasun.com/catalogue/page.aspx?i=9451

[evristow]

Woody,

After these tips, I will have to name the robot after you!!! Thanks a lot mate!

I will order the UNF to BSPP adaptor right a way!

Just sent and email to Wizard of NOS asking for a certificate of compliance stating the factory setted pressure.

Cheers,
Eduardo

[woody]

Happy to help Eduardo.

Just noticed this.....

Just waiting for the two 16oz bottles from Pure Energy (75 x 205mm).

Pure Energy is American and EU laws require the bottles to have a pi mark ....they may however comply...worth checking though.

http://www.luxfercylinders.com/products ... tcylinder/

The Paintball tank valves that I've taken apart have very small drilled passageways 1/64 as I recall and a convoluted route.

You might be able to purchase a MEGA / SUPER / HYPER flow version ....however the problem is quantifying the hype.

Cheers Woody

feel free to email me direct should you wish.

[evristow]

Woody,

I've bought one Pure Energy 16oz from Justpaintball.co.uk, a London based webstore, so I guess they are clear to be used here. If not I can try to return them and get my money back or store credit. They have exactly the size that I wanted for the project, although the project allows bottles up to 210 x ˜81mm, allowing Catalina and DCEC Cylinders as well.

For the Valve, I wanted 3~4mm bore, straight ball valve or even flux control valve, that way I could fill the buffer quick enough without freezing the bottle. One idea is to adapt the bottle from 5/8-18 UNF to G1/4 and put a regular G1/4 ball valve, but there is the burst disc issue, the adaptor would need to be custom made, pressure tested... How I miss my Lathe and Lab!

The on-off valve that I've got have a passageway around 1~1.5mm and clearly two 90° bends, living if with a pitiful Cv. They were advertised as increased flow, but the comparison is probably a pin valve... Which make the statement true.

I prefer talking on the forums, since more members can have the same questions as mine, making the answers even more useful! But I am co-writing the next version of RioBotz Combot Tutorial, both in English and Portuguese. On the previous versions I collaborated with two chapters and contributions on several others, now one of my goals is to improve the pneumatic and hydraulic chapters. Therefore any help will be greatly appreciated and credited! Your website will definitely be mentioned, as some of this forum topics! With this I hope the Americans (as a continent) start to build machines other than spinners and wedges, bringing more fun to the audience... Hehehe.

Thanks again!

Cheers,
Eduardo

[woody]

Use a liquid pick up in the main supply bottle and expand to gas IN the buffer ... it'll only take a second or so to refill even with the poor cv.

[evristow]

I've thought of that, the problem is the integrated shuttle valve design. Maybe I can change the design to allow liquid to the buffer or do a by pass with a macro line so the liguid doesn't have to go through the main valve. Later I will post a drawing of the system.

Thanks again!

Cheers,
Eduardo

[woody]

Energy is required to turn the liquid into gas.
Freezing or the transfer of heat from the surroundings ...including the co2 liquid itself ... happens at the point of expansion from liquid to gas.

So a word of warning on expanding liquid co2 to gas into your shuttle valve ...it'll freeze!

I have had success expanding the liquid to gas thru the buffer.

I look forward to a sketch of the system.

Woody