Home Manufacturers Valve Automation Markets Served Products About Us Contact Us Serving the Midwest’s Industrial Markets Since 1909 Your trusted partner for Valves, Instrumentation, Automation and Piping Specialties Click Logo for Product Card Dwyer Preferred Distributor Sep 30, 2021 Duncan Company is now a Preferred Distributor for Dwyer Instruments, consolidate your purchases and let our team help you save money! read more WILLISTON BASIN PETROLEUM CONFERENCE – BAKKEN NOW Apr 13, 2021 The Williston Basin Petroleum Conference is back - live and in person at the Bismarck Event Center on May 11-13, 2021 Register today at www.wbpcnd.com and make note to stop by our Booth 313! Be sure to sign up for some great giveaways! read more APOLLO RP4A AND RPLF4A REDUCED PRESSURE BACKFLOW PREVENTER Mar 4, 2021 read more « Older Entries Duncan Company is one of the Upper Midwest largest stocking Industrial Distributors We have two stocking locations, our Corporate headquarters in Minnesota and our division in Appleton, Wisconsin. Together we carry IN STOCK ball valves and butterfly valves, actuators, instruments and controls, safety products and piping specialties. We can supply you with the following key product manufacturers: Jamesbury, Apollo, Cashco, Fairchild Regulators, Anderson Greenwood Instrumentation, Flo-Tite, Asco Solenoid Valves, ABZ, Accuseal Critical Service Valve, Champion Valve, Kelair Damper Valves, Trimteck Control Valves, Rotork Actuators, Zwick Valves, Edward Valves, Powell, P.B.V., DSI, SVF Flow Control, Saunders, StreamFlo Industries, Sharpe, Leser, Taylor, FluoroSeal, Xomox, EVR Products, AQ Matic, Hayward, Habonim, Kinetrol, Remote Control, US Valve, Pratt Valves, Wika Instrumentation, Watson McDaniel, Spirax Sarco, YTC, Soldo, TopWorx, Go Switch, Midland-ACS, Titan Strainers, Rosedale, Fil-trek, BS&B Safety Systems, VCI, Parker, BLX, Hy-Lok USA, JMS, Westlock, DFT, Donaldson, Precision Digital, Rotronic, Thermal Instrument, Trerice, Tru-Flo, Keckley, Dynamix Agitators, Sentry Equipment, Grinnell, Shurjoint, Federal Screen, TopLine Products and more. Our Arjay Automation division with sales offices in Minnesota & Wisconsin can help you with Yokogawa, Honeywell, BLH Nobel, SICK Sensors, Swan Analytical Instruments, Moore Industries, Elpro Technologies, Hoffer Flow Controls, Cemteck, Chino, BTG, Air Monitor. We have an Electrical Division that can help you with Ametek Power Instruments, Beckwith Electric, Franklin Electric, Omicron, Radian Research/Weco, Solid State Instruments, and Tavrida Electric. Please browse our full product listing, or by manufacturer or by markets served. CONTACT US Corporate Headquarters: 425 Hoover St NE Minneapolis, MN 55413 PH: 612-331-1776 Duncan Co – Appleton, WI PH: 920-739-6066 LOCATIONS Duncan Co – Duluth, MN PH: 800-677-1776 Duncan Co – Bismarck, ND PH: 701-527-2759 Duncan Co – Nebraska/Kansas PH: 785-451-0183 Arjay Automation 425 Hoover St N.E. Minneapolis, MN 55413 PH: 612-861-1749 Arjay Automation – Kaukauna, WI PH: 920-462-4700 Arjay Automation – Duluth, MN PH: 800-677-1776 Contact Us