Schmidt MicroValve Series I Abrasive Metering Valve. This grit valve revolutionized the abrasive blasting industry by allowing blasters for the first time to accurately meter their abrasive. This comes from each turn of the knob adjusting the flow of abrasive blasting media. This consequently saves you money with a leaner flow of media. Simple design is easy to knock down for maintenance. Short abrasive path through valve minimizes wear. This results less downtime and spare parts cost. Ask your Area Manager for a parts break down. Repair kits and spares are available from your nearest BlastOne store.