PNA-DA-052

Double-acting pneumatic rotary actuator.

The rotary pneumatic actuator is designed to control BAV ball valves (valves) or butterfly valves, as well as shut-off valves from other manufacturers, where the connecting flange for installing the pneumatic actuator is made in accordance with ISO 5211 and DIN 3337 standards.

VALMA rotary pneumatic actuators of the PNA-DA series are double-acting actuators. This means that the opening and closing of the valve or flap connected to the actuator is carried out using compressed air energy. A more detailed description of the mechanism of action of the pneumatic actuator is given in the section Principle of operation of the two-way pneumatic actuator of the PNA-DA series.

For emergency valve closure in the absence of air pressure, one-way pneumatic actuators (with spring return) are used. For more information about the features and comparison of single- and double-sided actuators, see the article: "Quarter-turn pneumatic actuators of single and double action: selection, design features, comparison."