Emerson Bettis RPX Series Installation, Operation And Maintenance Manual Download Page 1

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DOC.IOM.BRX.EN Rev. 2

May 2021

Installation, Operation and Maintenance Manual

Bettis RPX-Series

Rack and Pinion Pneumatic Actuators

Summary of Contents for Bettis RPX Series

Page 1: ...DOC IOM BRX EN Rev 2 May 2021 Installation Operation and Maintenance Manual Bettis RPX Series Rack and Pinion Pneumatic Actuators ...

Page 2: ...Installation Operation and Maintenance Manual May 2021 DOC IOM BRX EN Rev 2 Notes This page intentionally left blank ...

Page 3: ...ring Return Actuators 6 Section 4 Disassembly Procedure 4 1 Double Acting Actuators 7 4 2 Single Acting Actuators 8 Section 5 Assembly Procedure 5 1 Assembly Double Acting Actuators 9 5 2 Assembly Spring Return 11 5 2 1 FAIL CLOSE Clockwise to CLOSE 11 5 2 2 FAIL OPEN Counterclockwise to OPEN 11 5 2 3 End Cap Bolt Torque Values 12 5 3 Spring Allocation 13 5 4 Setting of Internal Travel Stops 14 5 ...

Page 4: ...Installation Operation and Maintenance Manual May 2021 DOC IOM BRX EN Rev 2 Notes This page intentionally left blank ...

Page 5: ...er ISO 8573 1 standard 2 Where pipelines are subjected to extremes of temperature the system should be fitted with suitable air drying equipment 3 When working at low temperatures it is important that the compressed air has been dried to a dew point of less than the ambient temperature If this is not the case water will be condensed from the compressed air and freeze causing damage to the seals in...

Page 6: ...rotation MOP should be the maximum pressure regulator setting WARNING Do not exceed specifications It can be assured that the housing will not rupture or burst when applying 10 bar 145 psi of pressure but the cycle function cannot be guaranteed as it totally depends on the time span to which actuator is subjected at 10 bar 145 psi and the frequency at which these pressure peaks occurs Every time t...

Page 7: ... the VDE VDI 3845 NAMUR standard Adjustable travel stops are provided for each end of travel to ensure that the actuator will open and close the valve precisely 2 2 Storage All actuators leave the factory tested and in excellent working condition and finish In order to maintain these characteristics until the actuator is installed in the plant it is necessary to observe the following rules and tak...

Page 8: ... In line mounting Please ensure that you have an actuator with the correct drive and that the valve and actuator are in the following positions 1 Double Acting units and Spring Return units in FAIL CLOSE position valve closed actuator fully clockwise 2 Double Acting units and Spring Return units in FAIL OPEN position valve open actuator fully counterclockwise 3 1 Butterfly Valve Application Mounti...

Page 9: ...ine prior to mounting the actuator Rubber lined butterfly valves are an example of this 3 For valves which need to be installed in the pipeline prior to fitting the actuator ensure that the valve is operated into its failsafe position before mounting the actuator onto the valve Figure 1 Actuator Mounting Typical Butterfly valve mounting Typical Ball valve mounting Pneumatic actuator Stud Lockwashe...

Page 10: ...ting the actuator must be rotated through 90 This is achieved in the following manner All quarter turn valve types 1 Remove the actuator from the valve or the bracket by removing the 4 fixing bolts nuts and withdraw it vertically from the valve 2 Reposition the shaft insert 90 for Double D connections Bored keyed and star drives do not require this action 3 Rotate the actuator 90 4 Refit the actua...

Page 11: ... flat and loosen end cap fixing screws evenly 22 4 Remove the end caps 4 5 Using a suitable wrench in the top of the pinion shaft 2 turn the shaft counter clockwise to drive the pistons apart Remove the pistons 3 complete with back ing pads O rings etc 6 Remove circlip 24 from the bottom bore of the actuator including thrust washer 13 7 Protect the actuator bore during pinion disassembly and tap p...

Page 12: ... pack re tighten the end cap screws and return the unit to the factory for service 4 Remove end caps 4 and spring packs In order to avoid the springs falling out place the actuator with the end cap on top WARNING High spring force Do not disassemble the precompressed spring packs as the springs are under high force 5 Using a suitable wrench in the top of the pinion shaft 2 turn the shaft counter c...

Page 13: ...0 on the top of the pinion shaft 2 with the top O ring 16 uppermost b Fit the bottom bearing assembly 11 on to the bottom of the pinion shaft with the bottom O ring 17 at the bottom c Fit the top thrust washer 12 5 Carefully insert pinion shaft assembly from underside of the actuator 6 While inserting fit the travel stop cam 5 on top of the pinion shaft from within the actuator bore and monitor th...

Page 14: ...together with the O ring 19 washer 14 and lock nut 23 until the bolt hits the travel stop cam Tighten the lock nut 13 Turn the shaft counterclockwise through 90 to bring it in line with the center line of the actuator bore The actuator is now in the open position 14 Insert the left open travel stop bolt 21 together with the O ring 19 washer 14 and lock nut 23 until the bolt hits the travel stop ca...

Page 15: ...e end cap 5 Fit position indicator 25 to top of the actuator 6 Operate the actuator to open and close positions using compressed air and note the actual positions Adjust the travel stops if required following the routine described in this document If the required travel is not achieved refer to the troubleshooting guide 5 2 2 FAIL OPEN Counterclockwise to OPEN 1 Follow the steps 1 to 8 of the Doub...

Page 16: ...nd cap on top of the spring packs and fit end cap to body evenly using end cap screws 22 and washer 15 Tighten the end cap screws with the recommended Torque Table Make sure that the springs remain in position during assembly of the end cap 11 Fit position indicator 25 to top of the actuator 12 Operate the actuator to open and close positions using compressed air and note the actual positions Adju...

Page 17: ...Actuator Torque Table normally closed applications Ball valves use spring torque level which matches the spring torque at 90 with the supplied air starting torque at 0 Butterfly valves use spring torque level which matches the spring torque at 0 with the supplied air torque at 0 The number of springs used can vary between 4 and 12 pieces For durability make sure to divide the number of springs eve...

Page 18: ...op bolts should not be used for manual override actions After setting the travel stops accessories mounted to the top of the actuator must be re adjusted accordingly 5 4 1 Double Acting Actuator 1 Operate the valve actuator assembly to the closed position 2 Remove air supply 3 Slacken lock nut on the close travel stop right 4 Turn the travel stop clockwise to reduce travel or counterclockwise to i...

Page 19: ...el stop clockwise to reduce travel or counterclockwise to increase travel 5 Re tighten lock nut 6 Remove air supply to close the actuator If correct close position is not achieved repeat from instruction 2 7 Apply air to drive the actuator to the open position and check actual open position 8 Remove air supply so that actuator closes and the open travel stop bolt left can be adjusted 9 Adjust open...

Page 20: ...e adjusted 4 Turn the travel stop clockwise to reduce travel or counterclockwise to increase travel 5 Re tighten lock nut 6 Remove air supply to open the valve If correct open position is not achieved repeat from instruction 2 7 Apply air to operate the actuator to the close position and check actual close position 8 Remove air supply so that actuator opens and the close travel stop bolt right can...

Page 21: ...ck for air leakage across the piston seals by applying pressure to port 4 B and looking for leakage from port 2 A and or reverse 6 Check that the valve torque has not increased due to problems with the valve itself NOTE 1 Refer to disassembly and assembly procedures for gaining access to O rings and actuator internals if required 2 Reduced stroke i e valve not traveling the required stroke or back...

Page 22: ... 12 8 Spring steel A401 BS 5216 HS3 DIN 17223 Pti 7 Spring retainer max 12 9 Carbon steel 8 Spring cap max 12 5 Polyamide grade 66 up to size 052 Die cast aluminium size 084 and larger B85 A380 BS 1490 grade LM24 DIN1725 2300 or 226 9 Backing pad 2 1 Zytel 101F NCO10 10 Top bearing 1 1 POM Acetal Resin 25 glass filled 11 Bottom bearing 1 1 POM Acetal Resin 25 glass filled 12 Top thrust washer 1 1 ...

Page 23: ...Installation Operation and Maintenance Manual DOC IOM BRX EN Rev 2 May 2021 This page intentionally left blank Notes ...

Page 24: ... 1 281 477 4100 Av Hollingsworth 325 Iporanga Sorocaba SP 18087 105 Brazil T 55 15 3413 8888 ASIA PACIFIC No 9 Gul Road 01 02 Singapore 629361 T 65 6777 8211 No 1 Lai Yuan Road Wuqing Development Area Tianjin 301700 P R China T 86 22 8212 3300 www emerson com bettis VCIOM 13980 EN 2021 Emerson All rights reserved The Emerson logo is a trademark and service mark of Emerson Electric Co BettisTM is a...

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