Why So Many Valves End Up With This Exact Model

This particular Automax actuator (3841 series, double-acting, with solenoid and limit switches) is the one you see bolted on thousands of quarter-turn valves in chemical plants, water treatment facilities and oil terminals. It’s double-acting for fast operation both ways, the solenoid gives direct air control, and the limit switch box tells the DCS when it’s open or closed. Guys like it because it’s built heavy, the springs don’t break like cheap ones, and you can get parts next day from any Flowserve stock point.

Stuff That Holds Up in Real Plants

• Double-acting rack and pinion – strong torque both directions
• Namur solenoid mounted – direct 24V DC or 220V AC control
• Limit switch box with mechanical switches – reliable feedback
• Hard anodized aluminum body – no rust even outdoors
• Namur mounting – fits any standard valve top
• Adjustable travel stops – fine tune 90° exactly
• Works from -20 °C to +80 °C without special kits

Quick Specs

Where They Run All Day

• Ball valve on/off in chemical dosing
• Butterfly valves in water treatment
• Process lines in food plants
• Outdoor tank isolation valves

Questions We Get Every Week

Q: Can I change the solenoid voltage?
A: Yes – just swap the coil, common voltages in stock.

Q: Does it come with bracket and coupler?
A: No – standard is actuator only, order mounting kit for your valve.

Q: How long do they last?
A: Most plants get 8–12 years before first seal kit.

Contact

Phone/WhatsApp/WeChat: +8615000725058
Email: edwardzhao@gbsxj.com

Other Automax Stuff

• Single-acting spring return versions
• Bigger and smaller sizes in same series
• Namur accessory valves and switch boxes