airbag pressure drop when tank pressure drops

[hvychvy_72]

Im not thinking this is right. I have smc elec valves. I can air the susp to 140psi on all four corners and go and drain my air tank and the bags drain air with it. Shouldnt the bags stay up even if the tank is at 0psi.the valves dont need check valves do they. I did have to disasemble the valves to redo my orignal valve routing could I have assembled the valves wrong. It airs up just fine just losses air to the bags when I drain the tank.
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