1 ) Quick exhaust valve SE, SEU Screw-in exhaust air control with balanced noise emission. Valve function: quick exhaust Shut-off valve, piloted Screw-in With or without silencer 2 ) Quick exhaust valve VBQF Flat screw-in exhaust air control with reduced noise emission. Minimal height High flow rate Reduced noise emission Available with silencer Available with ducted or unducted exhaust air For higher cycle times