DRESSER RB 4700 Betriebsanleitung Seite 40

Maintenance of the Pilot
• Disconnect the pre-stage from the pilot with 4x long screws and replace the wear parts
• #9+16
• Disconnect the 2 blocks of the pre-stage with the 4x screws on both sides
• Replace wear parts #3+13+1+8+10+14+11+2
• First open spring cap and unwind the adjusting spring and replace the wear part #18
• Dismount the top part of the actuator with 4/12 (depending on pilot type) screws
• Open the screw nut on top of the valve rod
• Replace the membrane #4 and the ring#17
• Dismount the lower part of the actuator with 4 screws
• Replace the membrane #6
• Dismount the block with 4 screws
• Replace the wear parts #19+5+12+7+15