Paintball

[Jordan]

Originally Posted by Schmitti

Thanks bro... I'll putz with it later. Is the schrader valve in there as a check valve?

I may have a rock coming in as a replacement... but if I get this working expect to see the rock for sale.

E

I think the valve is what makes the whole thing work. I've had both apart (the FGP and the KAPP) and there aren't a whole lot of parts in there. The way the adjuster is threaded allows for very little movement of the internals with a gross movement of the adjuster - I believe that's how it works, although I've not sat down and checked it out just yet. I'm an information junkie, but even I'm not that bad yet.

Jordan

[Schmitti]

The schrader valve is something else.... the spring and big chunk-o-brass are what regulate the pressure output. By turning the dial you change the tension on the spring... this spring tension works against the air pressure to create the lower output pressure..... If you really wanted I could draw you a Free Body Diagram (Engineering talk for force diagram) that shows how the forces and parts interact... but I really don't want to.

I seriously think the schrader valve is just a check valve to keep pressure in the lpr incase there is an upstream/supply side loss of pressure.

E

[Jordan]

Just pulled the FGP apart - the only thing in there is a piston to depress the Schrader valve, and the Schrader valve itelf. No spring.

Jordan

[Schmitti]

Hmmmmm ....Any reg (HP or LPR) that I've ever taken apart has had a spring or springs between the adjuster and the piston.

I wonder why the FGP doesn't have a spring.

E

[Schmitti]

Was re-thinking the schrader valve... it really is a mystery to me why it's there. Basically for the LPR to receive air, the reg piston has to be pressing against the schrader pin... so if you have the reg turned all the way down, the lpr doesn't get air (and the pnues don't work).... you turn the reg up, moving the piston against the schrader pin, and the schrader starts letting air in.

In water supply we use valves sometimes to assist in pressure reduction and flow restriction ... I'm thinking that's why the schrader is there.... but the reg piston and reg spring do the major work on regulating the pressure.

Interesting and seemingly over complicated.

E

[Moosepatrol]

I have been following this thread as I am new to cockers and and I also have a leaky L.P.R. Mine leaks out the centre hole of my adjustment knob though. I took mine apart last nightand found a nick out of the o-ring. I also flipped over the seal on the pin side of the L.P.R. The leak now is barely a whisper but I think once I replace the o-ring it will be gone. Schmitti, do you work in water treatment? Did you take engineering?

[Schmitti]

Moose... I'm a (thumps chest) Licensed Professional Civil Engineer in PA and NY. Currently I work for NYSDEC... but I have done work in water supply, land development and environmental remediation work.

I hope to put some air to the FUBO box tonight.

E

[Drum]

Every time you flush your toilet, Schmitti's head gets bigger...




Take a bow, water boi

[Schmitti]

Nah... I don't deal with waste water.... and a half gallon flush when compared to a 2 Million gallon per day taking.... nothing.. I don't notice

E

[Moosepatrol]

I took civil as well, never bothered with my ring though, ended up in structural design. Now your valve leaking out the base I would have to believe the o-ring must have a nick, or the outer casing of the L.P.R. could be deformed ever so slightly. Just an idea.