Servo throttle/butterfly valve

[Medic]

Hi,

Am looking for a servo controlled throttle valve.

I have a hovercraft with a 22mm airflow outlet from which I want to regulate the pressure. Any form of motorised restriction will do but so far have had no success in sourcing a motorised orifice.

Ideally would be a plastic butterfly valve driven by a feather servo?

Any thoughts greatley appreciated.

Thanks,

Mark.

[DaveSawers]

I don't understand what you're trying to do or why.

What is providing the motive power? Can't you just throttle the engine to provide the pressure regulation you need?

[Medic]

Hi Dave,

I'm trying to regulate the pressure from a blower (high power fan).

The blower is made up from a brushless motor driving a tuned multiblade impeller but controlling motor speed does not give a quick enough respose so I need to have a valve that I can obstruct the blower outlet with to get pressure control.

Cheers,

Mark

[DaveSawers]

Then let's find a more appropriate forum for this question...

[Viper Pilot]

There is no hovercraft forum, but maybe the boat forum???

Or maybe a question for the heli-hover guys!!!

[green66]

Am looking for a servo controlled throttle valve I don't think you'll find an off-the-shelf integrated unit for your pneumatic application because the requirements for such devices (flowrate, gain, response, etc) tend to be too specific to warrant production mfg volumes - Probably simplest to obtain the valve first, then fit a servo with approp. torque/response characteristics.

In the hydraulics world, electrohydraulic servovalves are commonplace, so there may be some equivalence in terms of an air valve/servo for your type of application. . . but wouldn't bet on it. I'd start with manufacturers of small pneumatic actuators and valves used for controlling production line machines.
Some of the big names: Bimba, Eaton, Parker Hannifin, Clippard
Also try mfrs of lab and medical controls & instruments.
For a comprehensive search, try GlobalSpec (http://www.globalspec.com)

[flying4fun]

You might be able to try a carborator (spelling??) for a gas model engine. You may be able to get one in a 22mm size, but they can get pretty $$ and heavy at large sizes.

Alex

[docel]

:confused: Hi medic!!!
Butterfly valves cant regulate flow for a hov... Maybe slides with a Rack and Pinion drive. But... U can also try routing the excess flow (diversion) with a split duct. Butterfly valve will put back pressure on the fan!

:DDocVenki

[Terry S]

I thought they were either up or down, what do you need to adjust it for ?
Can you try and explane a bit more fully so we can understand and maybe we can give you a good answer.

Terry