October 2015
Service Instructions
VA001-196-30 Rev. 1
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Section 1: Introduction
Introduction
Section 1: Introduction
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General Service Information
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This service procedure is offered as a guide to enable general maintenance to be
performed on Bettis CBB double-acting series actuators. The following is a list of
general CBB model numbers.
Table 1�
CBB Model Numbers
MODEL (1)
MODEL (2)
MODEL (3)
315
315-M3
315-M3HW
420
420-M3
420-M3HW
520
520-M3
520-M3HW
525
525-M3
525-M3HW
725
725-M3
725-M3HW
(1) Also includes actuator models with –10 and –11 as a suffix
NOTE:
When the actuator model number has “-S” as a suffix then the actuator is special and may
have some differences that may not be included in this procedure.
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Normal recommended service interval for this actuator series is five years.
NOTE:
Storage time is counted as part of the service interval.
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This procedure is applicable with the understanding that all electrical power and
pneumatic pressure has been removed from the actuator.
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Remove all piping and mounted accessories that will interfere with the module(s)
that are to be worked on.
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This procedure should only be implemented by a technically competent technician
who should take care to observe good workmanship practices.
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Numbers in parentheses, ( ) indicate the bubble number (reference number) used
on the Bettis assembly drawing and actuator parts list.
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When removing seals from seal grooves, use a commercial seal removing tool or a
small screwdriver with sharp corners rounded off.
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Use a non-hardening thread sealant on all pipe threads.
CAUTION: FOLLOW MANUFACTURER'S INSTRUCTIONS
Apply the thread sealant per the manufacturer’s instructions.
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Emerson recommends that disassembly of the actuator should be done in a clean
area on a workbench.
