Kromschroder Solenoid actuator MB7LW3 74923046

The MB7LW3 solenoid actuator is designed for use with the Kromschroder BVHM butterfly valve. It operates at 230 V AC, 50–60 Hz, has protection class IP65, and supports three-point, 0–10 V, or on/off control. Its actuator size 7 is suitable for valve diameters from DN 40 to DN 100. The opening/closing characteristic is slow opening and fast closing, and pulse mode is supported.

Actuators of this type are selected by matching required torque, running time, control signal type (three-point, 0–10 V, or on/off), shaft or coupling pattern, rotation angle, and auxiliary switches. The valve body and actuator are often separate components; if the motor is seized, only the actuator may need replacement. Before ordering, verify that the replacement matches the existing mounting interface and the electrical signal of the current system.

Common failure modes are stripped gear trains from repeated end-stop overtravel, failed end switches, or a seized valve stem after prolonged standstill. When one of these occurs, the driven valve or damper may stay in one position and not respond to control commands. Check the gear train for broken teeth, test the end switches, and manually confirm that the valve stem rotates freely, especially after a long shutdown period.