Hoke needle valve

dont think that tubing size is correct. think you're lookin for 1/4"

None at all. They are a decent valve. But be advised that they use non-standard fittings. You can't put a barb on there.

bgoodwins said:

dont think that tubing size is correct. think you're lookin for 1/4"

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You could use 1/8" or 1/4" or 3/8" whatever you have fittings /adapters for. Sorry, I've no experience with Hoke.

Nope. With that type of fitting it uses that size OD tubing ONLY.

I'm looking to replace the needle valve that came with the Red Sea Pro system. Not at home at the moment but I think the tube size is 1/8".

I'm just looking around for alternatives but will probably go with one of the ones that Rex and others recommend.

I did a quick google search for that part number and found a PDF indicating that valve has a Cv (coefficient of flow) of 0.35 ... way too high for the low flow rates we need. You need a much lower Cv of at most 0.00x full open to 0.000x when near closed, if not even smaller ...

Rex Grigg said:

Nope. With that type of fitting it uses that size OD tubing ONLY.

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Maybe you missed the word 'adapter' that I mentioned. Just wanted to point out you can always get an adapter to whatever size you need.

Not at home at the moment but I think the tube size is 1/8".

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Well I'm home now and the OD is 1/4". Thanks for catching that.

crazy loaches said:

Maybe you missed the word 'adapter' that I mentioned. Just wanted to point out you can always get an adapter to whatever size you need.

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No you can't. I have valves sitting right here with Swagelok fittings one them. They don't "adapt".

Rex Grigg said:

No you can't. I have valves sitting right here with Swagelok fittings one them. They don't "adapt".

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Rex, I guess maybe your just playing dumb. It doesnt matter what valve it is or if your staring at a Swagelok right now. You can always adapt the line, not necessarily the fitting. Let me spell it out for you. You get a small amount of the line the fitting is designed to connect to. You hook the fitting to the line. Then you get whatever adapter/coupler you need to change to the size line the rest of your system uses. Or... you adapt the device on the other end of the line (if they can be) so that all you need is the right size hose for the original fitting.

I'm not playing dumb. You are not stating what you mean clearly.

You can't adapt the valve. You can use in-line adapters. There is a difference.

We got a reported post so I'll try to restate what you guys are discussing.

You can change the fittings on the valve but you can't attach an 'adapter' to the fittings on the valve.

You can increase or decrease tubing diameters by using inline 'adapters' to step up or down as needed.

Do I have it right?

Exactly. My point was you dont have to discount a certain needle valve (or other inline component) simple due to it using a slightly different tubbing, you can always use adapters inline if not on the fitting.

On a lot of those valves you can't even change the fittings on the valve. Nor can you attach an adapter.

You can always, of course, use in-line adapters.