SpudFiles

With the accessibility of microcontrollers these days, there are definitely possibilities in terms of autoloaders that would not have been easily accessible as purely mechanical systems.

Staying with my love of all things single shot I am thinking a self loading single shot with a gravity fed tube of 10mm ball bearings.

Got the 1/2" valve, it's pretty sweet, all polymer body so it's pretty light, rated at 150 psi, good enough for me.

My one day, some day, pistol layout, I have the QEV, barrel and trigger valve already, damn, it's nearly built then

Are you going for higher pressure with this one?

I have one of these Cheap-o Chinese Pumps on the way just to see what it's capable of:



4500 psi in a small chamber with a burst disk might make for some interesting supersonic testing.

L0L, Show me the innards when you get it and I'll tell you how I would immediately upgrade it or use it as a working pattern to build a badd ass pump!

Disclaimer: The use of a line boring machine is required! :bigsmurf:

For that money it's not going to be a Hill I'm sure, but it should suit my light duty requirements. Since the biggest trouble with these seems to be overheating, I wonder if a simple jacket full of coolant would be an effective upgrade.

jackssmirkingrevenge wrote:Since the biggest trouble with these seems to be overheating, I wonder if a simple jacket full of coolant would be an effective upgrade.

It worked for Browning.

ITWOST, I plan on some failure testing with various QEVs, using that exact same pump. $59 roobux shipped is $10 more than I paid for a pitiful shock pump.

My suspicions are that the wee little square 1/8" ones will survive at least 2kpsi, if not far more. The diaphragm is more likely to extrude out of the seat or the sealing face will rapidly exit the exhaust. But, I have a 1/8" nipple, a containment vessel and some earpro, so it should be a good experiment.

Zeus wrote:I plan on some failure testing with various QEVs, using that exact same pump.

Sounds like a blast

The diaphragm is more likely to extrude out of the seat or the sealing face will rapidly exit the exhaust.

This is my feeling too, the diaphragm will fail long before the structure. IIRC they've been taken to the 600-700 psi range without failure but with increased wear on the diaphragm itself.

I have a 1/8" nipple

Mine are around 1/4"

2 ideas for a stock layout, I'll have to make up both and see what they feel like, I have a tote bin full of PVC fittings and pipe, It's like my Lego

I've personally subjected a 1/2" (with the 3/8" outlet) to warm unregulated CO2, so my expectations are fairly high. Now, a 1/8" QEV, 2kpsi and a 6" barrel, that should be an entertaining toy.

ITWOST, again. Thoroughly impressed with the pump(for the price), ran it up to the full 4500psi. Wee little 1/8" QEV survived 2000, didn't manage to trigger it because of valve problems. Now I've been distracted by a pressure washer handle and 3000psi. Next test is a larger QEV.

Not even a diaphragm failure? Did you inspect it for damage?

I'm yet to strip it, but it held. Poor test because it was a QEV that I had bored out the seat to 4.5mm (was thereabouts to 4mm). It's always had a slight leak since, but still the gauge read 2100. Seeing as I was indoors I didn't care to go much higher. I've got another ordered which I plan on testing more extensively, I have a few spare diaphragms.

[Edit] Pulled it apart, nought a mark, score nor imperfection on it. Seems they're more durable than you'd expect from a $4 part from the PRC. 4500psi testing to follow