Part Turn Actuators
Part-turn actuators for on-off duty
Part-turn actuators are a special type of multi-turn actuator for operating butterfly or ball valves, for instance, with an output drive movement of less than 360°. Normally, the internal gear of the part-turn actuator is designed for travel of 90°; special ranges, such as 120° or 180° are also available.
Sketch: Part turn Actuators
The internal mechanical design of the part-turn actuators DP 30 ...119 differs from that of the multi-turn actuator, in that there is an additional second eccentric planetary gearing stage to adapt the actuator to the demands of the 90° movement. From actuator size DP 319 onward, a multi-turn actuator is combined with an additional gear box.
The flange dimensions and the different output drives, such as plug bush with bore and groove, square bore and dihedron, all correspond to the usual standards, e.g. DIN EN ISO 5211. This means that direct mounting on the valve is possible. Accessories such as foot and lever with ball joints make indirect operation of butterfly valves possible depending on the structural and design conditions of the valves. Torque values exceeding 1600 Nm are realized by multi-turn actuators with additional worm gear boxes.
Part-turn actuators For modulating duty
Modulating part-turn actuators of types D...R + MSG-R for operating modulating valves consist of a combination of a modulating multi-turn actuator designed for modulating duty and a high-grade modulating worm gear.
Meticulously selected matings of materials for the power transmitting components of the worm gear take into consideration the high demands of modulating duty. The modulating worm gears are flange-fitted to the output drive of the modulating multi-turn actuator.
DREHMO-Matic C Actuator in water works
The consistent observance of this modular design principle offers a highly economical solution for realizing practically all relevant output drive torques and valve operating times. The mechanical coupling of the gear output and the modulating part-turn actuator is achieved using the standard flanges and output drive designs in accordance with DIN EN ISO 5211.
As with the part-turn actuators for on-off duty, accessories such as foot and lever are also available for indirect mounting on the output side of the modulating worm gear. A separate detailed selection list can be requested for modulating part-turn combinations over 3000 Nm.
