I have also found the Lake valves to be very susceptible to contamination which
of course will also cause leaking. Also interested in similar pressure
alternate valves.
Don
Dr. Don Platt
Associate Professor, Space Systems
Director, Spaceport Education Center
Florida Institute of Technology
Spaceport Education Center
6855 Tico Road, Suite 102
Titusville, FL 32780
321-674-8519
www.fit.edu/spaceport<https://ex.fit.edu/owa/redir.aspx?C=X38ZOTWIHoopC1nhkthh5o9TIJ8ILcJ0M8vlvQ7WAKrrR7ElogbWCA..&URL=http%3a%2f%2fwww.fit.edu%2fspaceport><https://ex.fit.edu/owa/redir.aspx?C=X38ZOTWIHoopC1nhkthh5o9TIJ8ILcJ0M8vlvQ7WAKrrR7ElogbWCA..&URL=http%3a%2f%2fwww.fit.edu%2fspaceport>
[cid:0eff0b55-cefc-45dc-a70f-8206ce5f935a]
________________________________
From: arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> on behalf of
Wyatt Rehder <wyatt.rehder@xxxxxxxxx>
Sent: Thursday, October 8, 2020 4:05 PM
To: arocket@xxxxxxxxxxxxx <arocket@xxxxxxxxxxxxx>
Subject: [AR] Re: Vibration Tolerant Pneumatic Valve
A simple solution might be to use a NO solenoid, as you might be able to spice
up the actuator a bit and get the electric closure force stronger than the
spring return force. That might be enough to keep the leaks away. In a similar
vein, are you able to change the orientation of the solenoid to the vibration?
Or is the vibration axis pretty random.
Next option (which I haven't tried) they do make rotary solenoid actuators.
Which you could pair with a ball valve. That should be pretty immune to
vibration. But I can't attest to how reliable they are.
-Wyatt
On Thu, Oct 8, 2020 at 9:59 AM William Claybaugh
<wclaybaugh2@xxxxxxxxx<mailto:wclaybaugh2@xxxxxxxxx>> wrote:
Testing shows that the Lake Axial Solenoid valve in my pneumatic payload
separation system is leaking at 125 psia despite a 1000 psia rating (two
valves tested, both leaked); the leak is through the valve and caused the
latchup of the payload to the vehicle to fail within an average of four
minutes. Additional testing on my vibe table showed latch failure in less than
one minute in ten tests.
Can anyone suggest a solenoid valve good for at least 250 psia and unlikely to
leak under vibration?
Alternative suggestions to using a solenoid valve are welcome.
Thanks,
Bill