... 0.5m3 1m3 2m3 2. Sealed pnematic ash transport system for dust collector. 3. Save power, air drive Dense Phase ... time, the discharge valve and the intake valve is closed while Pneumatic sealing valve, close calve and exhaust valve open, so ensure ... convert electrical signals into valve signal,at the same time, exhaust valve closed, sealing valve, closed valve, vent valve open, after the pressure ...