Quote Originally Posted by T 20 View Post
I always took it that the rod was sealed by a lip seal, Chris.

So if you put the ram in a pressure chamber and increase the chamber pressure above the ram's internal pressure, then pressure will go past the lip seal and increase the internal pressure.

Obviously, if this is how they work then you can only increase ram pressure as there's no way of letting pressure out of the ram.



All the best Mick
Ahhhh that makes sense now, I had totally misunderstood what was going on lol (I'm a bit thick innit )) I reckon it would be a mare to get the pressure just right without being able to let any back out again