The Masoneilan Type 51/52/53 Piston Actuators meet requirements that exceed the typical capabilities of pneumatic spring diaphragm actuators. This model actuator is available in three different configurations:
Type 51: Double-acting cylinder (no springs), available with integral volume tank.
Type 52: Single acting cylinder, air to extend (extend stem) spring return
Type 53: Single acting cylinder, air to retract (retract stem) spring return

Application:

Larger valve sizes and other applications requiring longer strokes or travel; High pressure drop and tight shutoff applications