Duncan is an industrial valve and flow-control distributor with in-house valve automation and a century-plus record of doing what works. Since 1909 we have supported plants, OEMs, and contractors across the Upper Midwest with clear answers, top products, and world-class service that you can rely on.

We keep projects moving by pairing deep inventory with practical application support. Our teams help you select valves, actuators, instruments, and process safety devices that fit your service conditions. We produce over 15,000 automated valve assemblies each year! When you need complete automated packages, we size the actuator, supply or machine mounts and couplers, mount and wire switchboxes and solenoids, add air prep or positioners as specified, and function test every unit. You can count on us for all your valve and actuator needs.

Every inquiry connects you with a technical advisor who knows the application. Expect clear communication, realistic schedules, and precise handoffs from quote to delivery. Our standard is simple: tell the truth, do the work, stand behind the result. When you need certainty in flow control, count on Duncan to deliver the right solution the first time.