ITT Engineered Valves
Dia-Flo Pneumatic Actuator
Dia-Flo pneumatic actuators are rugged close-coupled airmotor actuators whose only wear parts are a nylon-reinforced diaphragm and Buna N O-rings, giving a service life of 20+ years. They use aluminum or ductile iron motor cases and a molded oil-resistant elastomer diaphragm rated for air pressures up to 85 psi. Seven interchangeable sizes cover fail-open (3100 series), fail-close (3200 series), and double-acting (3300 series) modes for on/off or throttling control.
Actuator Series and Modes
| 3100 Series | Fail Open (Spring-to-Open, Air-to-Close); sizes #12, #25, #50, #101, #130, #250 |
|---|---|
| 3200 Series | Fail Close (Spring-to-Close, Air-to-Open); sizes #12, #25, #50, #75, #101, #130, #250 |
| 3300 Series | Double Acting (Air-to-Close, Air-to-Open); sizes #12, #25, #50, #75, #101, #130, #250 |
| Modes of operation | On/off control and automatic throttling |
Construction
| Motor case | Aluminum or ductile iron |
|---|---|
| Actuator diaphragm | Molded, nylon-reinforced oil-resistant elastomer |
| Seals | Buna N O-rings |
| Max air pressure | 85 psi |
| Typical service life | 20+ years |
Approx. Weight (lbs, incl. adapter bushing)
| Double Acting #3312 / #3325 / #3350 / #3375 / #33101 / #33130 / #33250 | 5.5 / 13.5 / 33.5 / 42 / 71 / 88 / 140 |
|---|---|
| Fail Open #3112 / #3125 / #3150 / #31101 / #31130 / #31250 | 5 / 24.5 / 42 / 135 / 145 / 220 |
