DRESSER RB 4700 Betriebsanleitung Seite 37

Maintenance of the actuator body
• Disconnect piping of Pilot and SSV and Sensing lines
• Remove Pilot with 2 screws from the actuator top part
• Remove all other remaining screws to open the actuator top part
• Remove the position indicator and replace the wear parts #1+2
• Remove the grub screws on the valve rod guide and replace the wear parts #3+4+5
• Dismount the membrane assembly and replace the membrane #6
• Dismount the lower part of the actuator with 6 screws and replace the wear part #7
• Replace the wear parts #8+9+10
• Carefully dismount the adapter with the 4 screws off the valve body; the spring will
• push the adaptor open
• Replace the wear parts #11-13
• Dismount the valve plate with 3 screws
• Replace the wear parts #14-16