Pneumatic Relief Valves

[ukrobotics]

Pneumatic Relief Valves

I was wondering about 1000psi burst discs the other day. Theoretically it should be ok, but you do risk loosing all your gas on a hot day whereas with a relief valve it just dumps enough gas for the pressure to drop to below 1000psi.

Somthing like a 1200psi burst disc would probably be more useable but that would mean a change in the gas pressure rules which I imagine is very unlikley to happen.

Alan: I assume your burst disc idea is to have one inline with the pneumatic system like the relief valve and not replacing the one on the bottle ?


Dominic

http://www.ukrobotics.comhttp://www.ukrobotics.com

[blazerbotics]

Pneumatic Relief Valves

yeah, just takes the place of the PRD and leave the disc on the bottle, as you dont want it blowing when you leave your co2 tank in the car!

[tunna]

Pneumatic Relief Valves

I think its 17 degrees rise in temp causes a 1 psi rise in pressure (Boyles law)

[woody]

Pneumatic Relief Valves

http://www.flowstar.co.uk/http://www.flowstar.co.uk/

Flowstar Ni Relief Valve Type 5.3 & 5.2
Totally enclosed right angle safety valve. Type 5.3 with brass body / soft seat. Type 5.2 with stainless steel body/soft seat. SIZE RANGES: ¼€ BSP inlet x 3/8€ BSP outlet 3/8€ BSP inlet x 3/8€ BSP outlet ¼€ NPT inlet x 3/8 BSP outlet (5.2 only) SET PRESSURE RANGES: Type 5.3 0.5 to 120 BAR (G) Type 5.2 0.4 to 200 BAR (G). SEAT MATERIAL: Standard Viton (options from EPDM Kalrez) (In future as overflow valve ACC to Ce-certification, directive 97/23/EC ped).



http://www.dabengineering.com/burst_disc_assy.htmhttp://www.dabengineering.com/burst_disc_assy.htm

The above seems like a small company and may well be willing / able to supply a lower rating burst disc.

[simon]

Pneumatic Relief Valves

Thanks Woody, e-mails sent

[Guest]

Pneumatic Relief Valves

I have just poss found a supplier for the valves i any one wants one please put your name here or mail me direct so i have an idea how many i need and try for a better discount

[blazerbotics]

Pneumatic Relief Valves

we need at least two depending on price.

[fwsorg]

Pneumatic Relief Valves

I need one.

[simon]

Pneumatic Relief Valves

I need one. Just had a price returned to me. £150.00. YIKES

[Guest]

Pneumatic Relief Valves

get 2 at that price si

[simon]

Pneumatic Relief Valves

ye, one for each foot !!!!

[simon]

Pneumatic Relief Valves

PS It seems to be aceptable to use 1000psi burst discs. Will let you know if I get any prices.

[m2xt]

Pneumatic Relief Valves

Looks like I am upsetting more people by not supplying the 1000psi valves then I am by supplying them.

Valves are once again available to order from Technobots, there has been a small manufacturing price increase from last year. Stocks due in early April.

Paul
http://technobots.co.uk/en-gb/dept_121.htmlhttp://technobots.co.uk/en-gb/dept_121.html

[blazerbotics]

Pneumatic Relief Valves

paul, would 1000psi burst discs be acceptable?

[maddox]

Pneumatic Relief Valves

I would say Yes, (but Im not Paul).
Unfortunatly I never encountered a 1000psi burst disk.

But for safetypurposes in our machines it is an alternative to the relief valves, and weights less, takes less space. 1 Disagdvantage. 1 sleightly fuller bottle, or a warmer day, and youre venting the CO2 without any recourse.With the current relief valves it vents until the preset pressure is reached.

Also, DO NOT TAMPER WITH THE STORAGEBOTTLE.Leave the burstvalve where it belongs. In case of a 1000 psi burstvalve, that one has to be in line with the rest of the pneumatics in the robot.