[Wet Thumb Forum]-Needle valve problem ?

[TJ]

This above image is the one that i am using.

it is very nicely built but unlike most it has a push in lock fitting accepting 6mm/4mm tubing.

Other than its sensitivity it is solidly built and got nice little screwdriver slot for fine adjust (which it needs IMO)


I thought the MNV4K2 had a 25 turn valve therefore it having a very slow regulated adjustment output.

But what i have been reading on the previos few posts, it may be not much different to the one above.

For everyones interest the model is
MRFC - 6mm/ 1/8" Needle £9.76 + vat UK

Can be acquired from the westgroup.co.uk or clippard suppliers.

Luckily this needle has an 1/8" connection for direct connection to other attachments, unlike the 4K2.

So it looks like i will NOT get a finer adjustment needle then ?

Cheers all.
Mike

They can hide, but they cant escape

[BobAlston]

The Clippard MNV-4k2w has about 7-8 turns. YOu can see a chart of this in their catalog which you can download from their web site.

Do you know the manufacturer of the MRFC? I am guessing that it is also mfg by Clippard and has a built in check valve. Their catalog has several versions of "MFC-xxx" valves. The MFC valves have between 6 and 10+ turns of revolution.

The 1/8 connection is via the brass adaptor that was apparently included. If you remove it, I would guess that the built in is a 10/32 port.

Bob

[Doomer]

Man, that is one clear closeup. You must be a photographer.

[GulfCoastAquarian]

I've got the MNV-4K2 and what I do is set my tank regulator to 20 psi, then adjust the needle valve until it is fairly close to the bubble rate I am after and lock it down. I then adjust the pressure regulator a few psi up and down from 20 and can manipulate the bubble rate to within 10% of my desired setting.

-Sam P, BSME
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