[zack b]

using the fesco and bosh valve how do we keep are from crashing down when theres no air(the air in the tanks is empty) behind it. its possible with two fesco valves but they stop working when theres less than twenty pounds behind them I'm not sure if this is true with the Bosch valve
I'm looking for suggestions for making a relief type valve so are arm can slowly fall like a feather win theres know air left in the tanks.
i am aslo wondering if anybody knows how to get the piston to stop in one place.