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Message: <blockquote data-quote="TriHonu" data-source="post: 14553" data-attributes="member: 897">Tazza, you need to check the shuttle valve's Cracking Pressure and Internal Leakage Rate.  The Cracking Pressure will equate to the pressure contained in the case and still needs to be kept below 10 psi.The Internal Leakage Rate is also a concern since an ILR as low as 1 drop per minute could cause significant pressure in the case in a relatively short period of time.In your application of a concrete mixer the motor should not be under much of a load and should not need to be reversed.  I am assuming you will not be using it frequently or for long durations. I would think a Check Valve with 10 psi cracking pressure should work as long as the pressure in your return line is less than 10 psi.  I would be leery of using a shuttle valve if you are reversing since a small amount of oil will move back in to the case as the valve shifts.  Even a small amount of oil pushing back in to the case could cause significant pressure.  You could route the case drain to a small tank attached to the mixer.  As long as the motor is in good shape I wouldn't think you will have much if any oil to catch in your application.  You would be safe even if you reverse frequently.</blockquote>