The ET VALVE double-acting pneumatic actuator is a compact, high-efficiency rotary drive unit designed for the rapid, precise, and bidirectional control of quarter-turn valves. Unlike single-acting actuators that must overcome internal spring resistance, this actuator drives the opening and closing strokes by alternately supplying compressed air to opposing inlet ports. This design ensures linear and symmetrical torque output throughout the 90-degree rotation, resulting in higher operating speeds, a more compact overall footprint, and superior cost-effectiveness—making it ideal for standard industrial process automation applications.