Needle Valve Size for RC

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Re: Needle Valve Size for RC

Postby Hardie355 » Thu Sep 14, 2017 6:03 pm

A gate valve is piss easy to control and cheap, i know on my bubbler after full reflux i just close it all the way till i get product then crack it a quarter turn should start seein drops after it settles then adjust speed from there.(depending on the rc it can take a while to respond) mind you im on recirc so the pressure is constant but i do adjust slightly through the run as the water heats up normally only a fraction of a turn.
3 runs in you'll be all over it :handgestures-thumbupleft:
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Re: Needle Valve Size for RC

Postby hillzabilly » Thu Sep 14, 2017 8:22 pm

Another option is like Peterpan's set up,covers all options well.cheers hillzabilly ;-)
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Re: Needle Valve Size for RC

Postby Lowie » Thu Sep 14, 2017 8:25 pm

Gate and needle valves are totally different pieces of kit. For our hobby, we need needle vales for greater control. Here's what I bought: http://www.ebay.com.au/itm/DN15-1-2-Hig ... 2ede791f6f
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Re: Needle Valve Size for RC

Postby andybear » Thu Sep 14, 2017 8:25 pm

I use a 1/2" needle valve too but because I use tap water it is too big. Especially during winter with the fridgid temps coming out atm a 1/16 turn will go from full reflux to no reflux at all. I'm definitely going to get a smaller one eventually.
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Re: Needle Valve Size for RC

Postby Professor Green » Thu Sep 14, 2017 10:10 pm

Bunnings call their globe valves stop cocks. They have them in the same section as the gate valves.

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

Postby Professor Green » Thu Sep 14, 2017 10:16 pm

Borneogoat wrote: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


Looks right to me.

A brass one from Bunnings will be much cheaper though.

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

Postby warramungas » Fri Sep 15, 2017 9:11 am

Not sure id want a brass globe valve looking at it. Stainless would be ok though.
Ever had a dripping tap that just keeps getting worse no matter how many times you change the washers? That's because the restricted high pressure water is chewing away the brass slowly. I know I had to reseat every tap in the walls of my house with stainless seats because they all got chewed out. Been fine ever since.
Generally we run our valves fairly restricted so Id be looking at something in stainless for longevity.

Personally I run a 1/2" stainless ball valve on my PC and a 1/2" needle valve on my RC. The valve for the PC is only there to restrict flow a bit sometimes when I need a bit more pressure to feed the RC or sometimes the PC robs too much flow.
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Re: Needle Valve Size for RC

Postby warramungas » Fri Sep 15, 2017 9:26 am

My needle valve is a kick a** industrial one I scavenged from a salvage yard at work which I'm guessing was worth a few bucks in its day but if I needed a new one I'd be inclined to get a 90 degree one like the one below.

https://m.ebay.com.au/itm/BSP-1-2-Femal ... nav=SEARCH
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Re: Needle Valve Size for RC

Postby Borneogoat » Fri Sep 15, 2017 10:30 am

I've decided to spring for a needle valve. Seems the most common solution, so I'll gamble on that fixing my issue. I'll update with my results, after my next batch....
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Re: Needle Valve Size for RC

Postby bluc » Tue Oct 10, 2017 2:25 pm

warramungas wrote:My needle valve is a kick a** industrial one I scavenged from a salvage yard at work which I'm guessing was worth a few bucks in its day but if I needed a new one I'd be inclined to get a 90 degree one like the one below.

https://m.ebay.com.au/itm/BSP-1-2-Femal ... nav=SEARCH

I grabbed one of these when you posted this. Turned up today looks like decent quality fairly weighty etc even though not sure what to look for quality wise.. Slowly getting organised and will hopefully get my build done before christmas.. :-B :handgestures-thumbupleft:
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Re: Needle Valve Size for RC

Postby Borneogoat » Tue Oct 10, 2017 3:25 pm

1/2" needle valve worked for me. Much better control than the gate valve! :handgestures-thumbupleft: First run with gate valve was a bit of a cluster-fudge, but second run with needle valve was almost spot on.

I got mine here. Might be cheaper elsewhere, but built like a tank and works...
https://www.valvesonline.com.au/stainless-steel-needle-valve
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Re: Needle Valve Size for RC

Postby PeterC » Tue Oct 10, 2017 8:16 pm

:handgestures-thumbupleft:
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