STKNRUD

I have a Robart gear valve where, if the needle valve is even slightly threaded in, prevents the exhaust air from escaping so that the gear will not function. When I say "even slightly threaded in", I am talking about the difference between where the needle is held in place or gets blown out of the casing...1/4 turn maybe. I can remove the needles completely and the gear function is normal but a little to "severe" so I am pretty sure it is just a needle valve issue. Anyone ever have this problem? Anyone ever try filing a little off the needle itself and did it solve the problem?

Thanks,
George

zemkes_wolfpack

My Feedback: (5)

George,

Is this a new valve or has it been in service for a while?

STKNRUD

New valve....maybe 20 flights but the problem was noted as an issue on install. I can send it back but am just trying to safe the time and hassle if I can cure it myself.

zemkes_wolfpack

My Feedback: (5)

I have come across two possible causes of your issue in the past. There is possibly a burr in the hole that did not get completely removed before final assembly or I have also seen where the needle hole is not drilled completely through and the needle closes the hole off not allowing air to escape. The needle could be out of tolerance but I would tend to lean more towards an issue with valve body.

Hope this helps and keep me posted.

noahb

My Feedback: (67)

I had the same exact issue on my red robart valve. What I did was cut down the needle (do at your own risk) so that the point was blunt. This allowed it to screw in further and now it works perfect. It would only engage about 1.5 threads max. Now it works great and it still regulates fine.

I would take a pic, but I have it set where I want it and don't want to mess with it.

STKNRUD

Thanks for the input. I ended up shortening and narrowing the needle and got the result I wanted.

George

noahb

My Feedback: (67)

similar to what i did.