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Turbopump Screen

Posted: Mon Mar 26, 2018 5:54 pm
by Tom McCarthy
I'm using a Leybold Turbovac 150, and was about to bolt it on today when I realised the inlet screen was loose and not parallel to the inlet flange. It was a bit forward from its usual position, which I thought was fixed.

I pushed on it and the screen went back to its normal position and won't move now. If the pump was shook quite a bit while upside down, it might slip forward, but be able to be pushed back into position as described.

I'm not sure if anything has changed, perhaps it has always been this way. I'd like to make sure it's okay before spinning it up though.

Tom

Re: Turbopump Screen

Posted: Mon Mar 26, 2018 9:41 pm
by Jerry Biehler
A lot of screens are just a light press fit. Bouncing it around in shipping or handling can knock them loose.

Re: Turbopump Screen

Posted: Tue Mar 27, 2018 10:47 am
by Tom McCarthy
Sounds good, thanks Jerry.

Re: Turbopump Screen

Posted: Tue Mar 27, 2018 11:58 pm
by ian_krase
Yeah, can confirm.


Varian turbos ship with a small plastic pick (I suspect it might be a rebadged dress shirt collar stay) to flip the screen out of the recess it fits into.

Re: Turbopump Screen

Posted: Fri May 18, 2018 11:28 pm
by prestonbarrows
Turbo inlet screens are typically just loosly retained by the conflat or ISO gasket on the inlet port. That is, they won't be positivly fixed until you install the pump on the mating flange. Then, they should be a bit loose, but not able to grossly fall out.