Samson 3271 Mounting And Operating Instructions

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Samson 3271 Mounting And Operating Instructions Manual pdf 50 page image

9-6 EB 8052 ENServicing9.2 Preparing the valve forservice work1. Lay out the necessary material and toolsto have them ready for the service work.2. Put the control valve out of operation (seethe 'Decommissioning' section).3. Remove the actuator from the valve. Seeassociated actuator documentation.To remove an actuator with "stem extends"fail-safe action and/or with preloadedsprings, a certain signal pressure must beapplied to the actuator (see associated actu-ator documentation). Afterwards, the signalpressure must be removed and the air supplydisconnected again and locked.We recommend removing the valve from thepipeline before performing any service work(see the 'Removing the valve from the pipe-line' section).The following service work can be per-formed after preparation is completed:− Replacing the gasket (see section 9.4.1)− Replacing the packing (see section 9.4.2)− Replacing the seat and plug (see sec-tion 9.4.3)9.3 Mounting the valve afterservice work1. Mount actuator. See associated actuatordocumentation.2. Adjust lower or upper signal benchrange. See associated actuator docu-mentation.3. Put the control valve back into operation(see the 'Start-up' section). Make sure therequirements and conditions for start-upor putting the valve back into operationare met.9.4 Service workÎ Before performing any service work,preparations must be made to the controlvalve (see section 9.2).Î After all service work is completed, checkthe control valve before putting it backinto operation (see the 'Testing the in-stalled valve' section).NoteTip