Huma Reg

It happens. Flip the white Delrin disc over. It’ll be ok again. 

Sad fact is ... ALL regs will creep to some degree and the frequency in which shots are taken indeed may show the result.

* There is a cure and that comes with fine tuning of the set point pressure to be in harmony with hammer strike energy for the power gun is tuned too.

It is important to know or note what the velocity does at the pressure just before and AFTER coming off regulation. There is a bell curve same as an unregulated PCP has, and paying attention too this one can have a pcp that suffer some reg creep AND NOT HAVE IT EFFECT VELOCITY.

When a regulated PCP is tuned correctly the slight variation of plenum pressure due to reg creep simply does not change the guns speed so a gun sitting for some time will shoot at the prescribed velocity on the very first shot. It is an IMBALANCE of the parameters of pressure, hammer strike / hammer weight / spring rate that is more to blame than the regulator itself. 

Got'cha. This thing is tuned to the sweet spot and I've put maybe 3000 shots on the reg since the install. I guess my OP was more about the fact I thought the HUMA was tougher than that.

This little WC .177 has the reg tuned to 115b and then the HS is tuned just back from the knee of the power curve. It is quiet, accurate and I gets 96 shots per fill to 200b. Maybe I have the reg set too high?

So maybe I'll just flip the washer and call it good. 

Click to expand...

Just as a statement of fact ... ALL HuMa regulators have a small grub screw in there intake tract atop the brass adjuster, there run in until bottomed out and then back out 2-3 turns. There purpose is as a FLOW RESTRICTOR to prevent the Super Fast motion of the spool and seat getting hammered ... you remove this screw the sealing disk will have a SUBSTANTIALLY shorter life !!



FYI

Scott S

Just as a statement of fact ... ALL HuMa regulators have a small 2mm grub screw in there intake tract atop the brass adjuster, there run in until bottomed out and then back out 2-3 turns. There purpose is as a FLOW RESTRICTOR to prevent the Super Fast motion of the spool and seat getting hammered ... you remove this screw the sealing disk will have a SUBSTANTIALLY shorter life !!

FYI

Scott S

Click to expand...

I'm thinking that may have been how the Huma regs were sent out a few years ago, but they aren't delivered with that M3 screw now, and haven't been for a couple of years. I've received eight Huma regs over the past two years, and none have come with that restrictor screw. I even asked Huub (from Huma) about it (because the first Huma I got for my Renegade had one) and he said it wasn't necessary, but I could use it (if I had an old one) on the other end to pull the regulator from the pressure tube or action. Fact is, for the FX Royale/Boss/Bobcat action block, a restrictor screw won't even fit under the inlet plug. IMHO only...

I've been installing and using HuMa regulators for many years now and spoken with Huub many times about the grub screw damper. Required NO ... but at a cost to the sealing disk getting worn out faster due to the aforementioned reason. This was the point of my statement above ... if grub screw is not there the reg will suffer set point drift or leakage/ creep far sooner than a reg that has the grub screw in place.



No free lunch here ... faster refresh = faster the sealing disk/seat wears out.



Scott S

Scott, don’t want to argue. Your point is valid, but you missed my point. The Huma regs don’t come with that screw anymore, and haven’t for almost two years. So if you did decide to use one, you’d have to buy the screw and install it separately. And nothing in the instructions tells you to do that or recommends that. Just sayin’

I have 2 Huma regs, they are both on Edguns no grub screw came with them.

This is a situation where the manufacturer them self needs to make a statement on this subject .

Got nothing more to say or add ...