Emerson Bettis CBB Series Disassembly And Reassembly Download

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Service Instructions

VA001-196-30 Rev. 1

October 2015

CBB Double-Acting Series Pneumatic Actuators

Disassembly and Reassembly

Summary of Contents for Bettis CBB Series

Page 1: ...Service Instructions VA001 196 30 Rev 1 October 2015 CBB Double ActingSeriesPneumaticActuators Disassembly and Reassembly ...

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Page 3: ...tor Start up 4 1 12 Actuator Operation 5 Section 2 Actuator Disassembly 2 1 General Disassembly 6 2 2 Pneumatic Cylinder Disassembly 6 2 3 Housing Disassembly 8 Section 3 Actuator Reassembly 3 1 General Reassembly 10 3 2 Actuator Reassembly per CBB Models Listed in Step 3 1 5 1 10 3 3 Actuator Reassembly per CBB Models Listed in Step 3 1 5 2 14 Section 4 Actuator Testing 4 1 Actuator Testing 20 Se...

Page 4: ...E Storage time is counted as part of the service interval 1 1 3 This procedure is applicable with the understanding that all electrical power and pneumatic pressure has been removed from the actuator 1 1 4 Remove all piping and mounted accessories that will interfere with the module s that are to be worked on 1 1 5 This procedure should only be implemented by a technically competent technician who...

Page 5: ... use as a manual override M3 Manual jackscrew override 1 3 General Safety Information 1 3 1 Products supplied by Emerson in its as shipped condition are intrinsically safe if the instructions contained within this service instruction are strictly adhered to and executed by well trained equipped prepared and competent personnel WARNING FOLLOW WARNING AND CAUTION SIGNS For the protection of personne...

Page 6: ...re services 50 F to 350 F 45 5 C to 176 6 C use Bettis ESL 5 lubricant ESL 5 lubricant is contained in the Bettis Module Service Kit in tubes and the tubes are marked ESL 4 5 and 10 lubricant 1 7 General Tool Information 1 7 1 All threads on CBB Series actuators are Inch Unified and NPT 1 7 2 All tools Hexagons are American Standard inch Two adjustable wrenches Allen wrench set small standard scre...

Page 7: ...top adjustments once the actuator is installed on the valve Refer to the valve manufacturer s recommendations for specific requirements When the valve has internal stops the actuator should be adjusted at the same points NOTE The actual stopping should be done by the actuator If the valve does not have internal stops adjust the actuator to the full open position Using this as a reference point rot...

Page 8: ...sure 4 Control valve and fitting orifice 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 difficult 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 valve...

Page 9: ...Notate and record any abnormal symptoms such as jerky or erratic operation 2 1 1 Remove all operating pressure from actuator 2 1 2 Record the settings of stop screw or M3 jackscrews 1 70 and 4 30 before stop screws are loosened or removed NOTE In place of stop screws the actuator may be equipped with one or two ES ES Extended Stops or M3 M3HW 1 70 located on outboard end of housing 1 10 and M3 M3H...

Page 10: ...with center bar 8 10 from outboard end of cylinder 4 10 2 2 4 While holding housing torque shaft 1 30 pull cylinder 4 10 away from housing 1 10 2 2 5 Slide cylinder 4 10 over piston seal 5 40 and remove 2 2 6 Remove piston 4 50 from housing 1 10 NOTE Piston 4 50 is an assembly made up of one roll pin and one yoke pin do not attempt to disassemble the piston assembly 2 2 7 On actuator models CBB415...

Page 11: ...ve hex nut 1 80 from M3 jackscrew 1 70 NOTE CBB315 420 520 525 725 M3 or M3HW models the M3 cannot be removed now The M3 used in these models can be removed later in this procedure using steps 2 3 7 or 2 3 8 Stop screw 1 70 does not require removal from the housing 1 10 unless replacing with a new ES stop screw or M3 2 3 2 Remove both retaining rings 1 60 from torque shaft 1 30 Remove washers 1 65...

Page 12: ...om the inside of housing 1 10 2 3 8 Actuator models CBB420 520 525 725 with a M3 or M3HW mounted in the outboard end of housing 1 10 complete steps 2 3 8 1 and 2 3 8 2 2 3 8 1 Remove retainer ring 2 40 from M3 adapter 1 90 2 3 8 2 Remove M3 adapter 1 90 from housing 1 10 NOTE TheM3adapterwillberemovedfromtheinsideofhousing 1 10 withtheM3jackscrew 1 70 ...

Page 13: ... torque shaft and two extra O rings beneath the washers on the housing These items MUST be replaced upon reassembly CAUTION REPLACE WITH NEW PARTS Actuator parts that reflect any of the above listed characteristics may need replacement with new parts 3 1 4 Installation Lubrication Instructions Use the correct lubrication as defined in Section 1 step 1 6 3 1 4 1 Before installation lightly coat wit...

Page 14: ...ng 1 10 Apply a generous amount of lubricant to the slots in the arms of yoke 1 20 3 2 5 Insert the yoke key spring 1 50 with the ends pointing down into the slot in the torque shaft 1 30 and place the yoke key 1 40 on top of the spring with the tapered side outward WARNING FOLLOW YOKE KEY INSTALLATION STEPS If the yoke key 1 40 is installed incorrectly the housing may be damaged when next disasse...

Page 15: ... seal 5 20 with lubricant and install in the internal seal groove in the head of piston 4 50 3 2 17 Coat piston seal 5 40 with lubricant and install into outer diameter seal groove of piston 4 50 The piston seal will fit very loosely in the outer diameter seal groove 3 2 18 Install bushing 4 80 between the two arms of yoke 1 20 3 2 19 With the piston head facing away from housing 1 10 and with yok...

Page 16: ...rque as specified in the following chart Table 3 Tightening Torque Center Bar 1 CBB Actuator Model Maximum Torque Lbf in N m 315 55 75 420 AND 520 100 136 525 AND 725 130 176 3 2 27 If removed install ES or stop screw 4 30 into end cap 4 20 3 2 28 Install O ring seal 5 30 onto the ES or stop screw 4 30 Install the O ring seal against the end cap 4 20 3 2 29 Install new washer 4 90 onto the ES or s...

Page 17: ...70 NOTE M3 jackscrew 1 70 will be installed from the inside of housing 1 10 3 3 1 2 Insert and rotate M3 jackscrew 1 70 into housing 1 10 NOTE Rotate the M3 jackscrew into the housing until the inboard end of the M3 jackscrew is up against the inside of housing 1 10 3 3 1 3 Install O ring seal 2 30 onto M3 jackscrew 1 70 NOTE Move the O ring seal 2 30 down the M3 jackscrew until it is next to the ...

Page 18: ...nto M3 jackscrew 1 70 NOTE Rotate the hex nut down the M3 jackscrew until it is next to the M3 adapter 3 3 3 Apply a coating of lubricant to the torque shaft holes located on each side of housing 1 10 3 3 4 Coat O ring seals 2 20 with lubricant and install in the grooves located in the torque shaft through holes located on each side of housing 1 10 NOTE The cup of rod wiper seal will be installed ...

Page 19: ...exposed ends of yoke pin 3 3 12 Coat O ring seal 5 20 with lubricant and install in the internal seal groove in the head of piston 4 50 3 3 13 Coat piston seal 5 40 with lubricant and install into outer diameter seal groove of piston 4 50 The piston seal will fit very loosely in the outer diameter seal groove 3 3 14 Coat entire length of center bar 8 10 with lubricant including the threads 3 3 15 ...

Page 20: ...to internal diameter seal groove of the end cap 4 20 3 3 25 M3 Jackscrew 4 30 End Cap Installation for CBB315 415 M3 Model Actuators includes M3HW models 3 3 25 1 Apply a light coating of lubricant to the threads of M3 jackscrew 4 30 NOTE The M3 jackscrew will be installed from the cylinder side of end cap 4 20 3 3 25 2 Install and rotate M3 jackscrew 4 30 into end cap 4 20 NOTE Rotate the M3 jack...

Page 21: ...the hex nut down the M3 jackscrew until it is next to the M3 adapter 4 55 3 3 27 End cap outer diameter seal installation 3 3 27 1 For CBB415 520 725 models install O ring seal 5 15 onto the outer diameter of end cap 4 20 3 3 27 2 For CBB315 420 525 models install O ring seal 5 10 onto the outer diameter of end cap 4 20 NOTE Position the end cap 4 20 so that the inlet port is at the bottom and the...

Page 22: ... Torque Center Bar 2 CBB Actuator Model Maximum Torque Lbf in N m 315 55 75 420 AND 520 100 136 525 AND 725 130 176 3 3 31 Adjust both M3 jackscrews 4 30 and 1 70 back to setting recorded in Section 2 step 2 1 2 under General Disassembly Tighten both M3 jackscrew hex nuts 4 40 and 1 80 securely while holding M3 jackscrews 1 70 3 3 32 M3 hex drive hub or hand wheel installation as follows 3 3 32 1 ...

Page 23: ...he pressure listed in step 4 1 3 to the housing side of the piston and allow the actuator to stabilize 4 1 6 Apply a leak testing solution to the following areas 4 1 6 1 Cylinder to housing joint on CBB315 420 and 525 or cylinder to cylinder adapter to housing joints on CBB520 and 725 actuators 4 1 6 2 On the outboard end of housing 1 10 at the center bar hex nut Check the center bar to housing O ...

Page 24: ...inutes If any leakage occurs across a static seal the unit must be disassembled and the cause of leakage determined and corrected WARNING FIELD TEST ACTUATORS WITH CARE The actuator s main pressure bearing parts will be tested in controlled conditions by pressuring both sides of the piston to avoid damage and over torquing of the actuator components If further future testing in the field is necess...

Page 25: ...ebris left in the cylinder or housing during maintenance Disassemble cylinder assembly to remove debris and reassemble cylinder assembly as necessary Defective valve Consult the valve OEM documentation Apparent lack of torque Inadequate supply pressure Ensure supply pressure is above the minimum operating pressure of the actuator and that output torque produced at supply pressure exceeds valve tor...

Page 26: ...tor valve 5 2 1 1 3 Upon successful completion of the above described full stroke test procedure the test coverage can be considered 99 5 2 2 Partial Stroke Test when requested The Partial Stroke Test On line can be performed to improve the PFDAVG value and to satisfy PFDAVG average probability of failure on demand value A typical partial stroke value is 15 of the stroke and the recommended test i...

Page 27: ...F the power medium and bleed off all pressure first including storage tank if present Next bleed off pilot pres sure disconnect pneumatic pressure supply pilot tubing and electrical wiring if equipped Before starting the disassembly a large area should be created around the actuator so to allow any kind of movement Separate the parts composing the actuator according to their nature ex metallic and...

Page 28: ...t Revision Document Revision Section 7 Document Revision Table 6 Revision Overview ECN DATE REVISION STATUS BY DATE Released May 2012 0 Charles Khalid S Rico May 2012 VAWCO2794 October 2015 1 UPDATED Charles Khalid S Rico October 2015 Signatures on file Bettis Houston Texas ...

Page 29: ... 26 Appendix Appendix Appendix A List of Tables Table 1 CBB Model Numbers 1 Table 2 Actuator Weight 3 Table 3 Tightening Torque Center Bar 1 13 Table 4 Tightening Torque Center Bar 2 19 Table 5 Symptoms and Solutions Table 22 Table 6 Revision Overview 25 ...

Page 30: ...October 2015 Service Instructions VA001 196 30 Rev 1 27 Appendix Appendix Appendix B List of Drawings B 1 Part No VA001 005 72 4 CBBXXX Assembly Drawing ...

Page 31: ...October 2015 Service Instructions VA001 196 30 Rev 1 28 Appendix Appendix B 2 Part No VA001 005 73 3 CBBXXX M3HW Assembly Drawing ...

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Page 33: ...ongmeadow Business Estate East P O Box 6908 Greenstone 1616 Modderfontein Extension 5 South Africa T 27 11 451 3700 EUROPE Holland Fasor 6 Székesfehérvár 8000 Hungary T 36 22 53 09 50 Strada Biffi 165 29017 Fiorenzuola d Arda PC Italy T 39 0523 944 411 www emerson com bettis 2018 Emerson All rights reserved The Emerson logo is a trademark and service mark of Emerson Electric Co BettisTM is a mark ...

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