ContentsEB 8052 EN5.4.3 Fail-safe position .........................................................................................5-75.4.4 Pressure test ................................................................................................5-76 Start-up .....................................................................................................6-17 Operation ..................................................................................................7-17.1 Working in closed-loop operation ................................................................7-27.2 Working in manual mode ............................................................................7-28 Malfunctions ..............................................................................................8-18.1 Troubleshooting ..........................................................................................8-18.2 Emergency action .......................................................................................8-29 Servicing....................................................................................................9-19.1 Periodic testing ...........................................................................................9-39.2 Preparing the valve for service work .............................................................9-69.3 Mounting the valve after service work ...........................................................9-69.4 Service work...............................................................................................9-69.4.1 Replacing the gasket ...................................................................................9-79.4.2 Replacing the packing .................................................................................9-79.4.3 Replacing the seat and plug .......................................................................9-119.5 Ordering spare parts and operating supplies ..............................................9-1310 Decommissioning .....................................................................................10-111 Removal ..................................................................................................11-111.1 Removing the valve from the pipeline ..........................................................11-211.2 Removing the actuator from the valve .........................................................11-212 Repairs ....................................................................................................12-112.1 Returning devices to SAMSON ..................................................................12-113 Disposal...................................................................................................13-114 Certificates ...............................................................................................14-115 Appendix.................................................................................................15-115.1 Tightening torques, lubricants and tools ......................................................15-115.2 Spare parts ..............................................................................................15-115.3 After-sales service .....................................................................................15-3