Samson EB8048-2 Mounting And Operating Instructions

40 EB 8048-2/-3 ENServicing3. "Actuator stem extends" fail-safe ac-tion: guide the locking pin (Ø 3.5 mm)through the hole located in the bottomactuator section and the actuator stem."Actuator stem retracts" fail-safe action:apply 6 bar signal pressure to the actua-tor. Guide the locking pin (Ø 3.5 mm)through the hole located in the bottomactuator section and the actuator stem.4. Unscrew the plug stem (3) together withplug (2) and diaphragm (24) from theactuator stem and pull it out of the valvebonnet (20).5. Unscrew the actuator (A) from the valvebonnet (20).6. Remove locking pin.7. Compress the packing using a suitabletool and remove the snap ring (42).8. Pull all the packing parts out of the pack-ing chamber using a suitable tool. Renewthe damaged parts and carefully cleanthe packing chamber.9. Check the plug and diaphragm for dam-age. Replace them, if necessary (see sec-tion 7.2.2).10. Push the plug (2) together with plug stem(3) and diaphragm (24) into the valvebonnet (20).11. Carefully slide the packing parts over theplug stem into the packing chamber us-ing a suitable tool.12. Compress the packing using a suitabletool and insert the snap ring (42).13. Screw the actuator (A) onto the valvebonnet (20).14. "Actuator stem extends" fail-safe ac-tion: guide the locking pin (Ø 3.5 mm)through the hole located in the bottomactuator section and the actuator stem."Actuator stem retracts" fail-safe action:apply 6 bar signal pressure to the actua-tor. Guide the locking pin (Ø 3.5 mm)through the hole located in the bottomactuator section and the actuator stem.15. Apply a suitable lubricant to the actuatorstem.16. Screw the plug stem (3) together withplug (2) and diaphragm (24) onto theactuator stem. Observe tighteningtorques.17. Remove locking pin.18. Place the actuator and valve bonnet (20)together with the plug stem (3), plug (2),and diaphragm (24) onto the body (1).19. Apply a suitable lubricant to the hexscrews (34).20. Tighten the hex screws (34) on the valvebonnet (20) gradually in a crisscross pat-tern. Observe tightening torques.21. For version with Type 3724 Positioner:initialize the positioner (u EB 8395).7.2.2 Replacing the dia-phragm and plugBefore replacing the diaphragm and plug,remove the valve from the plant.Note