3
4.3 Driving tubular shaft: it is the electric actuator’s power take-off component, including three types which
are 2-PC, 1-PC and jaw type. For its structure, refer to Fig.10 to Fig.12.
2-PC driving tubular shaft has a inside valve stem nut and electric actuator bears valve’s axial force.
Generally, valve stem’s inner thread is processed by user. 1-PC driving tubular shaft is applied to non-rising
stem valve; or it could be connected with input shaft of HBC, BA, JA and other reducers. Its inner hole could
be single key, double key and spline. Jaw type driving tubular shaft could be meshed with valve stem’s jaw.
The type of the driving tubular shaft is chosen by user.
1.Driving shaft 2. Worm steel 3.Valve stem nut 4. Lock master
5.Bearings 6. Bearing 7. Valve stem
SMC/BA combined multi-turn electric actuator’s driving tubular shaft has three types.
For SMC/HBC, SMC/JA quarter-turn electric actuator’s driving shaft structure, refer to Fig.13. It has a
spline joint head inside it, which makes the connection between valve and electric actuator easily.
The hole which is used to connect spline and valve is generally processed by user.
4.4 Manual-electric switching mechanism
It is used to switch the electric actuator from electric operation mode to manual operation mode and vice
versa. It called “half-electrical mode, and electric operation mode is on the priority”. Push the switch handle
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