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Date: Sat, 20 Mar 1999 07:07:29 -0500
To: lancair.list@olsusa.com
From: John Cooper <heyduke@digital.net>
Subject: LC20 Dump valve problem
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>>
The bronze ball valve supplied with the kit is only rated at 150PSI working
pressure. although I have no personal knowledge of any of these failing, I
decided that I would install a hydraulic dump valve which was rated for the
pressure.

I happened to have a stainless steel, metal seat, plug-type valve laying
around here which was rated at 10,000 psi, so I put that in instead.

I have not tested the installation in use, since I am still a month away
from the first flight.

John

[Another builder recently advised me of a dump valve failure which caused
him fits with his hydraulic system for quite awhile.  I understand the 
present kit-supplied valves are rated at 600psi, still not enough to 
adequately do the job (IMHO) considering up-pressure is 1200.  I'll be 
using a 3000psi-rated hydraulic valve in my system, just to be sure.

    <Marv>  ]