Samson 3251 Mounting And Operating Instructions

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Samson 3251 Mounting And Operating Instructions Manual pdf 33 page image

EB 8052 EN 33Mounting and start-up5.2.2 Additional fittingsStrainersWe recommend installing a SAMSONstrainer upstream of the valve. It prevents sol-id particles in the process medium fromdamaging the valve.Bypass and shut-off valvesWe recommend installing a shut-off valveboth upstream of the strainer and down-stream of the valve and installing a bypassline. The bypass ensures that the plant doesnot need to be shut down for service and re-pair work on the valve.InsulationOnly insulate control valves with insulatingsection or bellows seal up to the bonnetflange of the valve body for medium tem-peratures below 0 °C (32 °F) and above220 °C (428 °F).Do not insulate valves mounted to complywith NACE MR 0175 requirements.Test connectionVersions with bellows seal fitted with a testconnection (G 1/8) at the top flange allow thesealing ability of the bellows to be moni-tored.Particularly for liquids and vapors, we rec-ommend installing a suitable leakage indica-tor (e.g. a contact pressure gauge, an outletto an open vessel or an inspection glass).Risk of personal injury due to pressurizedcomponents and process medium escapingunder pressure.Do not loosen the screw of the test connec-tion while the valve is in operation.Safety guardTo reduce the crush hazard arising frommoving parts (actuator and plug stem), asafety guard can be installed.Noise emissionTrims with flow dividers can be used to re-duce noise emission (see u T 8081).5.2.3 Installing the controlvalveVersion with flanges1. Close the shut-off valve in the pipelinewhile the valve is being installed.2. Remove the protective caps from thevalve ports before installing the valve.3. Lift the valve using suitable lifting equip-ment to the site of installation (see sec-tion 4.2.2). Observe the flow directionthrough the valve. The arrow on thevalve indicates the direction of flow.4. Make sure that the correct flange gasketsare used.5. Bolt the pipe to the valve free of stress.6. Depending on the field of application,allow the valve to cool down or heat upWARNING!