Snowpeak Regulator pressure increasing while cyclender pressure decreasing

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cjvprecision

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Feb 2, 2024
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Hello Everyone,
My air gun regulator increase fps while cyclender pressure decrease, for example i filled cylender at 240bars and regulator fps output 820, when cylender pressure decreased to 190bars the regulator increase fps to 836-840,
i rebuild the regulator and changed all the orings, could anyone help me how to get consistancy, gun is Artemis p15.
TIA.....
 
Stubbers said:
Opposite from what I am familiar with, generally some regulators can produce higher fps at higher fill pressures due to feeding the plenum more during the shot cycle.

Does your regulator pressure visually increase as the hpa cylinder pressure decreases, assuming there is a gauge to observe?

-Matt
Click to expand...
Thanks Matt
Yes
regulator pressure visually increase as the hpa cylinder pressure decreases,
Click to expand...
there is no guage to observe i use chronograph,
 
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Sounds to me then, that the regulator is possibly creeping and harder to open at higher fill pressures, resulting in 820 fps, and as pressure decreases, there is less creep, resulting in 830-840 fps.

Most reasonable explanation.

When you rebuilt the reg, did you modify the piston/piston seat surface finish? If not, that is the likely culprit.

-Matt
 
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Stubbers said:
Sounds to me then, that the regulator is possibly creeping and harder to open at higher fill pressures, resulting in 820 fps, and as pressure decreases, there is less creep, resulting in 830-840 fps.

Most reasonable explanation.

When you rebuilt the reg, did you modify the piston/piston seat surface finish? If not, that is the likely culprit.

-Matt
Click to expand...
I polish piston seat with shank wool. but didn't get mirror shine,
 
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cjvprecision said:
I polish piston seat with shank wool. but didn't get mirror shine,
Click to expand...

Its the most likely culprit and explanation I have, without a gauge on the regulator side it's near impossible to confirm except extensive testing with a chronograph and the gun sitting for periods at different pressures, (240 bar vs 190 bar as example).

You want a mirror shine, the surface quality here must be impeccable, and very square to eachother. Air molecules are around .3 to .4 nano meters, or .0000003-.0000004 mm.

That is how much tolerance your regulator seat has for perfection, if any air can slip by, it will, until the seat compresses more and more to eliminate that tolerance if present.

-Matt
 
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Stubbers said:
Its the most likely culprit and explanation I have, without a gauge on the regulator side it's near impossible to confirm except extensive testing with a chronograph and the gun sitting for periods at different pressures, (240 bar vs 190 bar as example).

You want a mirror shine, the surface quality here must be impeccable, and very square to eachother. Air molecules are around .3 to .4 nano meters, or .0000003-.0000004 mm.

That is how much tolerance your regulator seat has for perfection, if any air can slip by, it will, until the seat compresses more and more to eliminate that tolerance if present.

-Matt
Click to expand...
Yes i got your point..Could you please tell me how to get surface quality impeccable?
 
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Another viable solution is modifying the valve spring / hammer spring balance, provided what you're experiencing is creep induced valve lock at higher fill pressures opposed to lower fill pressures.

More hammer spring / less valve spring could restore balance of tune, provided you tune the gun 97-98% from your plateau. If you're tune at high fill pressure is 820 fps, and at low pressure is 840, then tune the gun closer to 840 at the high fill pressure and see what happens then at the lower pressure fill.

-Matt
 
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