Needle Valve Size for RC

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Needle Valve Size for RC

Postby PeterC » Wed Apr 26, 2017 1:35 pm

Hi, For those with 4 inch bubblers, what size needle valve do you use to control cooling to the RC assuming about 2400W of power? Found a 1/2 inch BSP needle valve with a 5mm internal orifice. This seems OK and should give reasonable flow so long as the pressure is OK. Don't need reducers if I get this size. Could go bigger but 3/4 inch is 7mm and 1 inch is 9mm. Thoughts?
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Re: Needle Valve Size for RC

Postby Cheersbigears » Wed Apr 26, 2017 1:51 pm

I just use a 2 x 1/2in bass gate valves from bunnings on the bottom of the RC and the PC. Not sure if the needle valve will have enough flow for full or almost full reflux. Very easy to use the gate valves and you can get the braided lines as well just for some more shine but that's just me.
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Re: Needle Valve Size for RC

Postby coffe addict » Wed Apr 26, 2017 1:57 pm

I run a half in needle valve and it's easy to control and maintains full reflux at only one full turn open.
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Re: Needle Valve Size for RC

Postby warramungas » Wed Apr 26, 2017 2:35 pm

coffe addict wrote:I run a half in needle valve and it's easy to control and maintains full reflux at only one full turn open.


Same.
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Re: Needle Valve Size for RC

Postby Zak Griffin » Wed Apr 26, 2017 3:39 pm

:text-+1:

1/2" needle valve on my RC..
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Re: Needle Valve Size for RC

Postby Bobsyauncle » Wed Apr 26, 2017 7:35 pm

Where'd you guys get the 1/2 needle valves from and $?
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Re: Needle Valve Size for RC

Postby hillzabilly » Thu Apr 27, 2017 12:34 pm

I got a couple from 5Star when they were in Perth,sorry donot recall the price but it was much cheaper than the $100 plus one I got from another supplier,give Alan or Sue a call and they may be able ta help ya out as they were not listed on there site but they did have a couple in stock.cheers hillzabilly :handgestures-thumbupleft:
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Re: Needle Valve Size for RC

Postby Bobsyauncle » Thu Apr 27, 2017 4:57 pm

Cheers bud, tossing up whether the price is worth it considering i can get gate valves from work. :handgestures-thumbupleft:
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Re: Needle Valve Size for RC

Postby scythe » Fri Apr 28, 2017 6:28 am

Use what you want and can get for the price you want to pay.
BUT,
Alot of members here use needle valves, and for good reason.
Controling the distillate output via RC requires fine movement.
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Re: Needle Valve Size for RC

Postby rumdidlydum » Fri Apr 28, 2017 9:09 pm

scythe wrote:Use what you want and can get for the price you want to pay.
BUT,
Alot of members here use needle valves, and for good reason.
Controling the distillate output via RC requires fine movement.

:text-+1:
You will use what you can easily aquire, but needle valves are the shiz niz :music-deathmetal:
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Re: Needle Valve Size for RC

Postby Redux » Fri Apr 28, 2017 10:04 pm

im a bunnin's gate guy... just rig your rc coolant out so you can see it... youll be fine...

(no gaurantees bout the word "youll" tho)

yay applepie!!
:obscene-drinkingdrunk:
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Re: Needle Valve Size for RC

Postby Borneogoat » Thu Sep 14, 2017 1:08 pm

This thread is a little old, but maybe you needle valve guys are still watching. I've got a FSD Neutralizer with 4" plates and the associated RC. First run last weekend and the Bunnings gate valve must go, not enough control. My question is regarding size for a needle valve. My gate valve says 1/2" on it, which I assume refers to the gate diameter, because the thread appears to be 3/4". Thus, I use a 3/4" Malte to Male When you guys suggest 1/2" needle valves are you referring to the thread size or another dimension (Note: I know little about valves). It would seem that if 1/2" refers to thread size, you must be using some reducers? I'm guess that a 3/4" valve would allow greater flow than a 1/2", but is that problematic?
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Re: Needle Valve Size for RC

Postby Professor Green » Thu Sep 14, 2017 2:54 pm

Mrs Mac recommended a globe valve over a needle valve to me when I enquired about them a few months ago. You can get them from bunnings.

Cheers,
Prof. Green.
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Re: Needle Valve Size for RC

Postby bluc » Thu Sep 14, 2017 3:12 pm

What do the bunnings ones look like? How do you view them on the bunnings site? Tried globe valve but nothing shows up..
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Re: Needle Valve Size for RC

Postby Borneogoat » Thu Sep 14, 2017 3:15 pm

Professor Green wrote:Mrs Mac recommended a globe valve over a needle valve to me when I enquired about them a few months ago. You can get them from bunnings.

Cheers,
Prof. Green.


Cheers Prof, something from Bunnings would be convenient. I've tried the Bunning site too with no luck.
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Re: Needle Valve Size for RC

Postby P3T3rPan » Thu Sep 14, 2017 3:24 pm

Borneogoat wrote:This thread is a little old, but maybe you needle valve guys are still watching. I've got a FSD Neutralizer with 4" plates and the associated RC. First run last weekend and the Bunnings gate valve must go, not enough control. My question is regarding size for a needle valve. My gate valve says 1/2" on it, which I assume refers to the gate diameter, because the thread appears to be 3/4". Thus, I use a 3/4" Malte to Male When you guys suggest 1/2" needle valves are you referring to the thread size or another dimension (Note: I know little about valves). It would seem that if 1/2" refers to thread size, you must be using some reducers? I'm guess that a 3/4" valve would allow greater flow than a 1/2", but is that problematic?

Plumbing fittings size describes the bore dimensions never the thread dimensions.
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Re: Needle Valve Size for RC

Postby Borneogoat » Thu Sep 14, 2017 4:09 pm

Is this the type of globe valve we're talking about:

RS Pro Stainless Steel Globe Valve, 3/4 in BSP 32 bar
http://au.rs-online.com/web/p/globe-valves/4992565/

Image
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Re: Needle Valve Size for RC

Postby PeterC » Thu Sep 14, 2017 5:32 pm

Bunnings call them gate valves. They only have brass ones which are OK for water cooling. They work by a brass disc (globe?) sliding up and down between some guides in the valve body as you turn the spindle. There is usually some slop in the threads so that you cannot trim up and down as reliably as a needle valve as when you change turning direction it may take half a turn before it starts to move again. Best monitor the flow to get a consistent result.

here you go https://www.bunnings.com.au/kinetic-15m ... e_p4790284
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Re: Needle Valve Size for RC

Postby bluc » Thu Sep 14, 2017 5:38 pm

Thought gate valves were different again :think:
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Re: Needle Valve Size for RC

Postby PeterC » Thu Sep 14, 2017 5:45 pm

My bad. A true globe valve is like this https://en.wikipedia.org/wiki/Globe_valve similar to how a tap works but they are not so common except in the process industry.
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