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Message: <blockquote data-quote="TriHonu" data-source="post: 81821" data-attributes="member: 897">As I think about this, the mechanics are two-fold:If you catch the end of the plow the cylinder on that side will create a pressure spike.  The cylinder on the opposite side is trying to extend and if it did, would create a vacuum in the other hose.Having a pressure release in the first line would allow the over-pressure to return to tank.  However the question I have is how much counter-force is created by the vacuum in other cylinder?Based on my experience, the vacuum force may be minimal.So as Jerry stated, having two pressure reliefs tee'd into one drain line should work fine.  The only question that remains is how high to set both pressure relief valves to allow them to operate below the force necessary to blow a hose or damage the plow.  I would probably set them both low and increase if the plow is changing angle without an impact load.</blockquote>