Number of Turns Required for Optimum Efficiency on a Thompson Valve

Have you ever wondered about how much abrasive is being pushed out of the blast machine?

thompson valve on blast potWithout measuring the supply of the abrasive you will be losing money – and possibly losing your profits. The good news is that when it comes to your productivity, grain for grain, we can help ensure the consumption and efficiency of your blast system.

The answer is the Thompson Valve – it’s not new, and those who fit these metering valves to their blast system fully understand the benefits.

How the Thompson Valve Works

Four turns open means 100% abrasive economy (*using Australian GMA superior quality abrasive).


thompson valve turnsFast start/stop for spot blasting - For those projects where you must only blast small areas or rust spots, you’ll appreciate the very fast on/off control the Thompson II Valve™ allows. Blast a spot there and another over here without ‘dragging’ the blast and damaging the coating in between. The Thompson II Valve™ gives almost instantaneous starting and stopping control.

Abrasive cut off and blowdown option - A remote abrasive cut-off is available for Thompson Valve™ systems, allowing you to stop the flow of abrasive, while continuing to blow air only. This provides a quick and easy way to clear the blast hose and to blow the blasting area clean of abrasive. Just flick the optional switch at the Deadman handle.

Do you blast with steel grit or a metallic abrasive?

The Magna Valve is an ideal addition to your blast system: The Magna uses magnetic fields to accurately control the flow of media. This allows you to electronically set and adjust the amount of steel grit that you use. These are most typically seen and used on Wheel Machines or in Shot Blasting applications.

There are many different models available with a flow range of 0-1350 kgs/hour. Also – if you’re focused upon results – the BlastOne Media Flow Detector is an ideal fitting to your blast system:


  • For all types of media
  • Requires little maintenance due to no moving parts
  • Operates from 24 Vdc
  • Relay contact output
  • Push-button setup
  • LED indicators
  • Completely sealed against debris
  • Unique magnetic technology eliminates leaks and flooded wheels
  • Easy retrofit to Goff, Pangborn, Wheelabrator and other abrasive blast cleaning machines
  • Cost savings from the efficient use of media
  • Provides process improvement from a closed-loop system when paired with a MagnaValve Controller

Flow Detector is used for pressure-type abrasive blasting machines. The sensor uses a charge-coupled amplifier that is connected to a sensing ring placed in the flow path of the abrasive blasting media. Each particle passing the ring shares a minute charge with the ring, converting it to a voltage used to activate the output relay contact.