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Quick Disconnects/Push to Connect

Old 01-27-2010, 01:58 PM
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Tired Old Man
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Default Quick Disconnects/Push to Connect

I'm not a jet or turbine person, but I've come into a serious need for a fuel system quick connect or push to connect that is assured against leakage when used correctly. They would need to handle a given line size somewhere from 1/8" to 4mm, low in bulk and weight, and be able to withstand looong exposure to Jet A and JP turbine fuels. They would also need to withstand some line pressure.

That brings up another question; How much pump pressure is being used in turbine model aircraft and are you using pressure regulators?

Sure appreciate any feedback you folks will provide.

Pat
Old 01-27-2010, 02:19 PM
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Default RE: Quick Disconnects/Push to Connect

I use Festo connectors for connecting/disconnect my fuel system. You can buy them from dreamworksrc.com.
Old 01-27-2010, 02:32 PM
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Default RE: Quick Disconnects/Push to Connect

i've been using these from Dreamworks with excellent results.


http://dreamworksrc.com/catalog/prod...roducts_id=966


http://dreamworksrc.com/catalog/prod...roducts_id=965
Old 01-27-2010, 04:59 PM
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Default RE: Quick Disconnects/Push to Connect

ORIGINAL: Tired Old Man

That brings up another question; How much pump pressure is being used in turbine model aircraft and are you using pressure regulators?

Sure appreciate any feedback you folks will provide.

Pat
Pat,

We mostly think of fuel flow and not fuel pressure. Our pumps only operate with as much voltage/speed as necessary to run the turbine as commanded by the ECU in response to throttle position. It is purely suction on the supply side and positive pressure from the pump to the turbine. I have never seen a pressure value and we don't use pressure regluators.

FYI, our supply lines are generally in the 6mm range and pressure side lines are 4mm. The max flow in our largest turbines is about 24ozs /minute.

Craig
Old 01-27-2010, 06:13 PM
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Default RE: Quick Disconnects/Push to Connect

If I recall correctly, B. Wilcox told me that a Jetcat pump (Hausl pump) is considered "good" if it puts out 80 psi at 3.7 volts (power supply volts, not ECU volts).

George Manning checked a bunch of older pumps, a dozen or so, we had between us and the results ran anywhere from the low 70's to 90 psi.
Old 01-27-2010, 07:06 PM
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Default RE: Quick Disconnects/Push to Connect

I have used festo type fittings on air system up to 120 psi without any issue. Festos work very good providing that you use them on pressure side of things on not on a sucktion side. Some use them on the sucktion side and have had no problems, however I believe they were not designed for sucktion.

They are fairly cheap, make several sizes and misc. valves, angle fittings, bulk head fittings, etc...

Prob. what you are looking for. They disconnect by pushing in on a small flange and pulling the tubing out. Simple.

Old 01-28-2010, 10:53 PM
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Tired Old Man
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Default RE: Quick Disconnects/Push to Connect

Thanks guys.

One last question about the Festo's. Do they positively auto seal on the female side when they disconnect? Knowing the question sounded like a total lack of understandig on my part but it's one of the critical functions rquired for the project.

And thanks again.
Old 01-28-2010, 10:56 PM
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Randy M.
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Default RE: Quick Disconnects/Push to Connect

yes, they have one that will do that. It has a check ball in one end. You have to be specific when you order it. They make many different types for many applications.
Old 01-29-2010, 10:32 AM
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rolsen12
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Default RE: Quick Disconnects/Push to Connect

Get the Colder Products Company Catalog.
Fax# 612 645 5404 Or Tele.# 800 444 2474.
They will not sell too you direct, but they will tell you where a local dealer is in your area.
They make all sorts of disconnects.
Old 01-29-2010, 01:59 PM
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Default RE: Quick Disconnects/Push to Connect

Thanks again.

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