With my Jetcentral turbines I've been used to receive a mechanical fuel shutoff valve besides the fuel solenoid.

Now that I received two (2) SPT 5 turboprops from Jetcat, I was looking for this valves but they are not included. Looking at the install diagram, they are not even shown.

Are you guys including additional shutoff valves for your Jetcats ? What happens if your fuel solenoid fails and remains open while you fuel your turbine ? You can have a hot start.....

Hi they are not imcluded.
Use the festo ball valve as a shut off which can be purchased from Dreamworks models.
As you said you should run one just in case.
Ivan

I would definitely put a valve after the pump and before the valves. Never on the UAT side. You are right about a chance of a hot start. Been their. Dan Avilla BVM rep

Thanks guys. Why never on the UAT side.... ? I know instructions always say after the pump, but don't know why.

it causes a restriction to the supply if placed between the UAT and pump

What a load of crap.
If the pump is running flat out and needs to be shut off you want the valve on the suction side so there is no chance of the pump blowing a fuel line off and starting a fire.

It wouldn't hurt you to use some manners!

It's not even enjoyable any more reading or being on this forum.
Account deleted.

so you were rude.
see ya.....bye......don't let the door hit you in the a##.......

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The problem with the valve on the uat side is most of us would use a festo to get a valve large enough. Festos can cause a air leak with negitive pressure. I have to admit I used to do it that way but changed when I noticed air bubbles. As for your pump running away I have it one time in 14 years and it was in the air. On the ground you would be montering it and have a fire extingusher.
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Gonz,

Mine came with one and I use it in between the pump and the turbine.

Saludos!

Beave

Give them a call and ask for two, Bob is always willing to help any one not only customers.

I just purchased a turbine that did not come with a manual shut of valve and manufactor suggests putting a switch in line with the pump wiring and even making
the switch servo operated, Seems to me that is about the best way for a emergency shut down. I think it is still a good idea to have a manual valve that you can
close during refueling.

Hi,

Manual valve has 2 functions:

[ul][*] emergency fuel stop (which I personally put before the pump)[*] fuel stop to stop fuel running in turbine during re-fueling (in case of leaking solonoid)
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I have never seen air leakage with a festo coupling on the suction side, but maybe i am just plain lucky up till now.

Cheers,

Viperone

what is the default attitue of solenoids? I have always seen them close by default (ie no power) so is it still possible to have a wet start if your solenoids are already closed?

+1

Not all of us in Aussie are like that.

Gonzalo,

I always use a manual Festo ball valve after the pump and an electronic switch that is available from Intairco here in Australia to switch off the solenoid. But if there is no solenoid I also use an electronic switch to switch the pump independently from the ECU.

It is part of my start and spool down routine to manually open and close the ball valve. Whenever there is no need for Kero I switch it off.

As for the electronic switches - they are controlled by a separate channel, so if I lost the ECU for any reason, I can still either close the solenoid or switch off power to the pump.

For what it's worth, I have never received any manual valves with any of my AMT or JetCat turbines.

Cheers,

Jan

The default is closed, I personally use a festo tap after the pump.
I was advised to do it that way especially on a new pump as apparently the gears can spit out crud that can possibly enter the valves and stop them closing properly,
Gary.

Madmodelman,

Are you not confused with the fuel filter? A valve wont stop crud.

As for solenoids open or closed, i have seen cases where the solonoid leaked causing a spectacular (wet) start.

Cheers,

Mick

Omg, too early in the morning, you are of course correct!
Apologies for that.
I like to have the tap after the pump as I've had a wet start after ignition failure. If it ever happens again I can quickly kill the fuel supply.

It's a shame this guys lack of manners took away from the conversation I think putting the valve on the suction side would not only be a restriction but if the vacuum was overcome it would allow the rest of the fuel in the line to drain into the turbine. Responding to this guys "load of crap" comment, I always felt that if you secure your pressure lines properly, they should be able to withstand the pumps full pressure. :-)

Scott

Although there seems to be some merit in the comment regarding manners I do hapen to agree with him. I have written before on the dangers of fitting a tap on the pressure side! I have checked my JC pumps and the stall pressure exceeds 280psi, so be careful!!

m

Thanks guys for all the comments. I have already ordered some Festo valves from Dreamworks....