- Midstream Instrumentation
- Milltronics and Siemens
- Tyco Environmental Systems – Greenspan Analytical
- Process Control Services Pty Ltd
- Armstrong Flow Control Pty Ltd
- ifm efector and Emerson Process Management (Rosemount)
Greenspan and Tyco Environmental Systems
Instruments for the water and waste water treatment industries are Midwest Valves & Controls' specialty.