The tough rack and pinion actuator that plants use on ball and butterfly valves when they need something that lasts
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.
| Type | Double-acting rack & pinion |
| Torque at 5.5 bar | Around 130–150 Nm (exact depends on size) |
| Air supply | 3–8 bar |
| Solenoid | Namur 4-way, 24V DC standard |
| Limit switches | 2× SPDT mechanical |
| Protection | IP66 / NEMA 4X |
| Temp range | -20 °C to +80 °C |
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.
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Email: edwardzhao@gbsxj.com
