Re: ok i did it!
1Bar = 14psi approx
It should work fine in loose sand, but packed ground will probably break it up in short order.
Something other than antifreeze? What does the manufacture say?
If you program your mixes correctly, a prv shouldn't be necessary... be sure not to hold a valve open for long when the cyls are at their maxium strokes, could eventually cause a blow out somewhere in the system.
A pressure valve is relatively easy to make yourself..
threaded brass barrel
steel ball the correct diameter to seal the opening
compression spring to put press on the ball
grub screw to hold spring
google pressure relief valve to see pics & script
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