Table 4: Examples
Model number Description
B308
Advantage 2.1 actuator, double acting, series 8
B216
Advantage 2.1 actuator, fail close, series 16 with a spring set
Identification tag
Line Description
1
Valve serial number
2
Valve size and model number
3
Valve diaphragm type
4
Maximum recommended actuation pressure
2.2 Bonnet description
Non-Sealed bonnet
The non-sealed bonnet has a weep hole that indicates a diaphragm failure by allowing process fluid that
accumulates in the bonnet to pass through the hole.
Sealed bonnet
The sealed bonnet uses a special “V-notch” vent plug, which permits leak detection.
Bonnet
weep hole
V-notch vent plug
(Sealed bonnet only)
Figure 4: Weep hole and V-notch vent plug
2.2 Bonnet description
Advantage® 2.1 Actuator Maintenance Manual
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