Emerson Bettis CBB Series - Actuator Operation Procedures

October 2015
Service Instructions
VA001-196-30 Rev. 1
5
Section 1: Introduction
Introduction
1�11�2 Check Connections:
1. Pneumatic/hydraulic components connected as per schematic enclosed
or in service manual supplied.
2. Pneumaticsupplyconnectedtoidentiedports.
3. Electrical connections terminals are secure.
4. Wiring as per enclosed diagram or service manual supplied.
1�11�3 Whenactuatorisrstputintoserviceitshouldbecycledwithregulated
pneumatic pressure. This is necessary because the seals have been stationary,
causing them to take a "set". Therefore, the actuator should be operated through
severalcycles,exercisingtheseals,resultinginaservicereadycondition.
1�11�4 The actuator speed of operation is determined by a number of factors including:
1. Power supply line length
2. Power supply line size
3. Power supply line pressure
4. Controlvalveandttingoricesize
5. Torque requirements of the valve
6. Size of the actuator
7. Setting of speed controls
1�11�5 Duetotheinteractionofthesevariablesitisdifculttospecifya"normal"
operating time. Faster operating times may be obtained by using one or more of
the following:
1. Larger supply lines
2. Larger control valve
3. Higher supply pressure*
4. Quickexhaustvalves
 *Nottoexceedmaximumoperatingpressureofactuatororcontrolcomponents
1�11�6 Sloweroperatingtimesmaybeobtainedbyusingowcontrolvalvestometerthe
exhaust.Excessiveexhaustowmeteringmaycauseerraticoperation.Normally,
incoming supply should not be metered.
1�12 Actuator Operation
1�12�1 Controlled Operation: Controlled operation is accomplished by pressurizing and/or
depressurizing the appropriate cylinder inlet(s) of a double-acting.
Do not exceed pressures indicated on actuator nameplate�
1�12�2 Manual Operation: All pressure must be vented or equalized on both sides of the
pneumatic piston prior to manual operation.