Samson 3525 Mounting And Operating Instructions

EB 8823 EN 43Maintenance4. Unscrew the seat (4) using a suitabletool.5. Remove seat ring gasket (127) from thebody (1) and carefully clean the sealingface. Insert a new seat ring gasket intothe body.6. Apply a suitable lubricant to the threadand the sealing cone of the new seat.7. Screw in the new seat (4) using a suit-able tool. Observe tightening torques.8. Carefully warm up the plug (29) so thatit can be removed from the plug stem(36) in the next step.9. Apply a signal pressure to the actuatorso that the flats at the plug stem (36)emerge from the bonnet. Place wrenchon flats.10. Place another wrench on the flats of theplug (29).11. Loosen plug with wrench while counter-ing with the top wrench.12. Apply suitable threadlocker to the threadof the new plug (29).13. Screw plug head (29) onto the plug stem(36) using a suitable tool. Observe tight-ening torques.14. Replace packing (15) as described insection 7.2.2.15. Apply a suitable lubricant to the bonnet(2).16. Screw bonnet (2) with yoke (3) and plugwith plug stem (5) into the body (1). Ob-serve tightening torques.Tungsten carbide or ceramic plug1. Remove stem connector clamp (A28).See associated actuator documentation.It is not necessary to completely remove theactuator from the valve to replace the seatand plug.2. Apply a signal pressure to the actuator toslightly lift the plug off the seat. Unscrewthe bonnet (2).3. Lift bonnet (2), yoke (3) and plug withplug stem (5) off the body (1).4. Replace O-rings (17) as described insection 7.2.1.5. Unscrew the seat (4) using a suitabletool.6. Remove seat ring gasket (127) from thebody (1) and carefully clean the sealingface. Insert a new seat ring gasket intothe body.7. Apply a suitable lubricant to the threadand the sealing cone of the new seat.8. Screw in the new seat (4). Observe tight-ening torques.9. Replace plug with plug stem (5) and in-sert it into the bonnet (2).10. Apply a suitable lubricant to the bonnet(2).11. Screw bonnet (2) with yoke (3) and plugwith plug stem (5) into the body (1). Ob-serve tightening torques.Note