X-Virus-Scanned: clean according to Sophos on Logan.com From: "Stephen Izett" Received: from mail-pd0-f174.google.com ([209.85.192.174] verified) by logan.com (CommuniGate Pro SMTP 6.0.10) with ESMTPS id 7239125 for flyrotary@lancaironline.net; Mon, 27 Oct 2014 19:19:47 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.192.174; envelope-from=steveize@gmail.com Received: by mail-pd0-f174.google.com with SMTP id p10so6531838pdj.19 for ; Mon, 27 Oct 2014 16:19:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:content-type:message-id:mime-version:subject:date:references :to:in-reply-to; bh=NSu6Kn84iKYqY/aU4Y6YofjBt0rmPKeNRhhyJPD0Tzo=; b=h5yGIKTRxwTpVtYtLOiztT+KJK0ZbU2lPwPiSJeL+Lgmm5X1mU7TVPJVfg5L73+n1P n8k2e3i8p7OdXuTTFo5GMCh5us/RzA2RGeaGGUuwgBbvNKUhqVPgv9tJlASl9JcJJ5rN tZbQgUkuso82zzlQ7BuMgnOQwzrYOobeC+4UVAetoDmtaSTj4lmyonXCDalbIMzgIPaP g0zJ18iHe2IvMTP5YAPQ2B6E4OUqWLeRaDlzpNlfdIZ8lEVu1rY5/6YkxfVLYXwzb0rn KG8hIGy4QNB6U3gI8m7xtourlwI/SYQjYtDKn5r+o2CrVqgeGGEhUFnGbBXWnGXODj+n wRDA== X-Received: by 10.67.16.106 with SMTP id fv10mr27782191pad.47.1414451953028; Mon, 27 Oct 2014 16:19:13 -0700 (PDT) Return-Path: Received: from [10.1.1.12] (106-69-41-211.dyn.iinet.net.au. [106.69.41.211]) by mx.google.com with ESMTPSA id c1sm11819136pdk.72.2014.10.27.16.19.10 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Mon, 27 Oct 2014 16:19:12 -0700 (PDT) X-Google-Original-From: Stephen Izett Content-Type: multipart/alternative; boundary="Apple-Mail=_4BFA5DAD-1A3D-4615-9F71-3EF56957455C" Message-Id: <0DC8F341-1598-4B12-9D13-D351C6B53B48@icloud.com> Mime-Version: 1.0 (Mac OS X Mail 8.0 \(1990.1\)) Subject: Re: [FlyRotary] Re: electric fuel selector valves Date: Tue, 28 Oct 2014 07:19:07 +0800 References: To: Rotary motors in aircraft In-Reply-To: X-Mailer: Apple Mail (2.1990.1) --Apple-Mail=_4BFA5DAD-1A3D-4615-9F71-3EF56957455C Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 I stand corrected. I believe Charlie is correct. Steve Izett > On 28 Oct 2014, at 6:47 am, Charlie England = wrote: >=20 > On 10/27/2014 4:55 PM, Ernest Christley wrote: >> This is the type that I'm referring to: >>=20 >> = http://products.pollakaftermarket.com/item/fuel-selector-valves/light-truc= k-6-port-motor-driven-valve/42-302 = >>=20 >>=20 >> On Monday, October 27, 2014 5:50 PM, Ernest Christley = = wrote: >>=20 >>=20 >> 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.=20 >>=20 >>=20 >>=20 > 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.=20 >=20 > '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. >=20 > Charlie --Apple-Mail=_4BFA5DAD-1A3D-4615-9F71-3EF56957455C Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=iso-8859-1 I stand corrected. I believe Charlie is correct.
Steve Izett

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

On 10/27/2014 4:55 PM, Ernest Christley wrote:
This is the type that I'm referring 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.  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

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