X-Virus-Scanned: clean according to Sophos on Logan.com From: "Mitchell Williams" Received: from mail-ie0-f176.google.com ([209.85.223.176] verified) by logan.com (CommuniGate Pro SMTP 6.0.10) with ESMTPS id 7240099 for flyrotary@lancaironline.net; Tue, 28 Oct 2014 10:34:34 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.223.176; envelope-from=mitchw1962@gmail.com Received: by mail-ie0-f176.google.com with SMTP id rd18so773179iec.21 for ; Tue, 28 Oct 2014 07:33:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=QfcuKnK7SPgMnntUNBCWHevPxotZaIl/BomXXX33iFE=; b=iliG9tOTHLWiuLpXbqvaiD3EPUhhgCye1NFG+qB7U4KLTIKPbHohb+0a3KlRkqTHCK mT5rJSLj7lc6oY3QVQqabdTP69dKM2yBYsXBvoUJA2LnldEmvckMtBM2h/Te+8Am4lNa 6Y1WJATdgefBAx8KLYKk57r0F1Xgs5Xx5f2A1SCyk6W9qbvNLquht/JlB5zE30BCns5M p3MobUhokxfGAZH0k/5YzLSJEax5P/hkrb3Un+fwG+KdK5g3kVlRcNez5ESERa/R9biz S628Xwg+EBZLhd008iL0J8kh+9JZqlayuqZZWTA1JRRcbndy+SRgv6cCBGn/9flUaTF9 tcVw== MIME-Version: 1.0 X-Received: by 10.50.50.2 with SMTP id y2mr12318548ign.1.1414506838229; Tue, 28 Oct 2014 07:33:58 -0700 (PDT) Received: by 10.107.29.77 with HTTP; Tue, 28 Oct 2014 07:33:58 -0700 (PDT) In-Reply-To: References: Date: Tue, 28 Oct 2014 09:33:58 -0500 Message-ID: Subject: Re: [FlyRotary] Re: electric fuel selector valves To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=089e0115eab0a0084505067c89be --089e0115eab0a0084505067c89be Content-Type: text/plain; charset=UTF-8 http://products.pollakaftermarket.com/Asset/42-159%20IS_41-revdd.pdf On Mon, Oct 27, 2014 at 6:19 PM, Stephen Izett wrote: > I stand corrected. I believe Charlie is correct. > Steve Izett > > > On 28 Oct 2014, at 6:47 am, Charlie England > wrote: > > On 10/27/2014 4:55 PM, Ernest Christley wrote: > > This is the type that I'm referring to: > > > http://products.pollakaftermarket.com/item/fuel-selector-valves/light-truck-6-port-motor-driven-valve/42-302 > > > On Monday, October 27, 2014 5:50 PM, Ernest Christley > wrote: > > > Is anyone familiar with electric fuel selector valves as used in > automotive applications. I'm trying to figure out how they operate. Do > they select one line when power is applied to a solenoid type plunger, and > then the other line is selected when power isn't applied? Or does a pulse > of power switch them back and forth? If they maintain the currently > selected tank when power is absent, it seems to me that this could remove > fuel lines and a leak prone selector valve from a lot of cockpits. > Furthermore, the 6 port models look like they could be plumbed easily to > handle return lines. > > > > The ones I've seen actually use a motor to move the valve (think screw > jack), so they will remain in last position. Reading your linked item > indicates that it works the same way. > > 'Traditional' engine guys have avoided them in the past because they're > plastic and they require power (and they are an automotive product, so they > can't be reliable ;-) ). They are probably worth considering, but I'm > seriously looking at switching to in-tank turbine pumps with automotive > style PWM control; no return line needed. Then tank selection would be with > a switch on the panel instead of a valve. Downside is that for total > redundancy, I'd need 2 pumps in each tank. They are dirt cheap (<$20 each), > but controllers are around $75 ea and switching gets pretty elaborate if > there are more than 2 tanks. > > Charlie > > > -- Mitchell Williams OKPE, ATP/CFI/A&P/IA www.chickashawings.com *of shadow and ash* http://www.amazon.com/dp/B009KZGVQS --089e0115eab0a0084505067c89be Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

On Mon, Oct 27, 2014 at 6:19 PM,= Stephen Izett <flyrotary@lancaironline.net> wrote= :
I s= tand corrected. I believe Charlie is correct.
Steve Izett


On 28 Oct 2014, a= t 6:47 am, Charlie England <flyrotary@lancaironline.net> wrote:

=20 =20 =20
On 10/27/2014 4:55 PM, Ernest Christley wrote:
This is the type that I'm referrin= g to:



On Monday, October 27= , 2014 5:50 PM, Ernest Christley <flyrotary@lancaironline.net> wrote:


Is anyone familiar with electric fuel selector valves as used in automotive applications.=C2=A0 I'm trying to fi= gure out how they operate.=C2=A0 Do they select one line when power is applied to a solenoid type plunger, and then the other line is selected when power isn't applied?=C2=A0 Or does a pulse= of power switch them back and forth?=C2=A0 If they maintain the currently selected tank when power is absent, it seems to me that this could remove fuel lines and a leak prone selector valve from a lot of cockpits.=C2=A0 Furthermore, the 6 port models look like they could be plumbed easily to handle return lines.



The ones I've seen actually use a motor to move the valve (think screw jack), so they will remain in last position. Reading your linked item indicates that it works the same way.

'Traditional' engine guys have avoided them in the past because they're plastic and they require power (and they are an automotive product, so they can't be reliable ;-)=C2=A0 ). They are probably w= orth considering, but I'm seriously looking at switching to in-tank turbine pumps with automotive style PWM control; no return line needed. Then tank selection would be with a switch on the panel instead of a valve. Downside is that for total redundancy, I'd need 2 pumps in each tank. They are dirt cheap (<$20 each), but controllers are around $75 ea and switching gets pretty elaborate if there are more than 2 tanks.

Charlie




--
Mitchell Williams OKPE, ATP/= CFI/A&P/IA =C2=A0 www.chickashawings.com
of shadow and ash http://www.amaz= on.com/dp/B009KZGVQS

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