Canadian Airgun Forum

Thank you Bob...

Has i understand i have a defective regulator then. What a waist of money. Antbody has experience with tuning and fixing a regulator????

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Hatsan At44 Tactical .22
Steyr hunting 5 automatic
Ruger air magnum .22
Weirhauch HW100 .22
Gamo Expomatic .177
Benjamin Marauder DougP custom stock
Theoben SlR98 .22
AlEx Custom gun .22 (JezX built masterpiece)
Hatsan Atp2

Quite correct Bob the reg pressure is altering dependant upon pressure in the cylinder.

Could be many things with the reg
Crushing as air pressure collapsing the reg.
Shut off valve seal though more evident as a slow leak upping the pressure to knock open valve.
Diameter of the piston wrong! Larger diameter works better at low pressure and vice versa.
Have seen it happen on the disc spring arrangement, usually the stacking, try 2 to a pair () () () () etc if no good (()) (()) etc

Nothing new with that reg design from 1983 by Barry McGraw copied by others ever since.

Venting to atmosphere with this design is 95% of the time the front piston o ring, same with AA rebuilds a day after.

Thank you for this input.
So i presume my reg needs to be dismantle and verify the springs setup.

Alex

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Hatsan At44 Tactical .22
Steyr hunting 5 automatic
Ruger air magnum .22
Weirhauch HW100 .22
Gamo Expomatic .177
Benjamin Marauder DougP custom stock
Theoben SlR98 .22
AlEx Custom gun .22 (JezX built masterpiece)
Hatsan Atp2

I have discovered the problem. As Bob stated, the reg...is not working. After testing on the bench, I then reassembled the gun and test fired a complete string, the reg worked fine,but the pressure was too low, so I dissassembled the reg again to put back one of the spring washers I had removed earlier.I wanted to make sure there was enough play in the washer configuration to close the valve. To do this, I put the reg in the vice and measured the travel of the plunger. After confirming there was ample travel to close the valve, I reinstalled the reg and test shot a string and thats when I discovered the problems. It wasn't until trying a number of things did I think to check the nylon seal on the end of the plunger, and discovered that I had depressed the nylon seal into the end of the plunger, so it could not seal properly. So now I have to try and make a new seal. I have some teflon, but I'm unsure if it will hold up.

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If I had only one wish, it would be to be able to "unsay" things.

I am a valve technician..

I can tell you from experience you have a seal on the inside of the regulator that is passing.

EDIT
Read the entire thread, seems you found the problem!!

Cheers!

what is a 'valve technician'?

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Walter

A radio ham with a very contemporary call sign apparently. VE6 is Alberta. Welcome to the forum

I fix valves, actuators, gearboxes and various instrumentation equipment. I work for CNRL Horizon in Ft. Mac

Thank you for the Ham welcome!!
Apparently there are a few of us on here coming out of the wood work

As an Instrument Mechanic the term valve tech is new to me.
Anyhoo welcome to our fine forum )

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Walter

I am glad for you, we are a horrible bunch!

Basically do the exact same thing as instrument techs... much cheaper and no requirement for schooling as there is none, All job training is done through manufacturers training/in house training.

My day to day consists of recertifying PSV's, repairing control VLVs and calibrating, gearboxes, and actuators. Hydrotesting, Nitrogen testing etc

Fisher, Mooney, Masoneilan, Bettis, Score, Consolidated, Farris

You name it I can have it apart for you, repaired with new soft goods and any machine work.

As to what you call it?
On my paystub is says Lead Valve Technician, in my books it doesnt matter what I am called as long as I collect a paycheck and fly home on my 14 on 14 off rotation at CNRL

Thank you for the welcome! You guys are awesome!!!!
Regards

Kyle

14 off sounds good. Man I could get some stuff done with that. Mind you, the 14 on would be tough...

You get used to it. Its rough having a young family at home. But with two weeks off you can go anywhere and do anything

Anyway back to the topic. I fixed the plunger with teflon. Works great now.

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If I had only one wish, it would be to be able to "unsay" things.

Teflon is great. Self lubricating and stands up to some abuse. How did you test it?

I made a test stand from an old airforce pump. Since it's a hatsan at44, it came with a brass dust cover and a brass bleeder. So I just took one of them and threaded a small pipe to join the dust cap to the pump. Then plugged the hole where the hose was. All I do for testing is remove the front o ring from the tube and attach it to the pump via the dust cap. Then fill as usual. For testing, I fill the tube with a piece of teflon almost the same dia as the id of the tube. This saves a lot of pumping or air useage if you have a tank.It works great.

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If I had only one wish, it would be to be able to "unsay" things.