SAMSON Type 3277 pneumatic diaphragm actuator 3271 / 3277

Diaphragm pneumatic actuators for series 240, 250, 280 and 290 valves. Type 3277 has a yoke for direct positioner attachment without external travel pick-off tubing. On air failure the stem moves to a defined fail-safe position.

• Predictable fail-safe position
• Direct attachment of accessories on 3277
• Common travel range with 3730 positioners

• Type: Pneumatic diaphragm actuator, linear
• Models: 3271 and 3277
• Valves: Series 240 / 250 / 280 / 290
• Safety: Stem extends or retracts
• Mounting: NAMUR on 3271, direct on 3277
• Air consumption: Typically 1.4–7 bar together with the 3730 positioner

Application: For 3241, 3244, 3251 and related series valves. Loops that require a fixed position on air failure.