There are a few different stem heaters to choose from.
Depending on application, there are a few different stem (yoke) heaters to choose between for the Forta actuators.
When Forta series actuator is used with a Venta valve, stem heater part no 8800108000 should be used when media temp is 0°C to -20°C.
Note: This stem heater is not compatible with the M700 actuator.
If used with V321 DN65-100, stem heater 8800110000 should be used.
If used with V222 DN65-100, stem heater 8800112000 should be used.
In other applications, yoke heater part no 8800109000 for Forta should be used. Capacity for the yoke heater is: Ambient temp down to -10°C or media temp down to -8°C
For more on stem heaters, see Lessons Learned Article #12578.