Samson 3271 Mounting And Operating Instructions

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Samson 3271 Mounting And Operating Instructions Manual pdf 36 page image

5-6 EB 8052 ENInstallationcessories not fitted with noise-reducing fit-tings. Both can damage hearing.Î Wear hearing protection when workingnear the valve.Crush hazard arising from actuator andplug stem moving.Î Do not insert hands or finger into theyoke while the air supply is connected tothe actuator.Î Before working on the control valve, dis-connect and lock the pneumatic air sup-ply as well as the control signal.Î Do not impede the movement of the actu-ator and plug stem by inserting objectsinto the yoke.Î Before unblocking the actuator and plugstem after they have become blocked(e.g. due to seizing up after remaining inthe same position for a long time), re-lease any stored energy in the actuator(e.g. spring compression). See associat-ed actuator documentation.Risk of personal injury due to exhaust airbeing vented.While the valve is operating, the actuator orvalve accessories may vent during closed-loop control or when the valve opens orcloses.Î Wear eye protection when working inclose proximity to the control valve.Risk of personal injury due to preloadedsprings.Actuators with preloaded springs are undertension. They can be identified by the longbolts protruding from the bottom of the actu-ator.Î Before starting any work on the actuator,relieve the compression from the pre-loaded springs (see associated actuatordocumentation).To test the valve functioning before start-upor putting back the valve into operation, per-form the following tests:5.4.1 Leak testThe plant operator is responsible for per-forming the leak test and selecting the testmethod. The leak test must comply with therequirements of the national and internation-al standards that apply at the site of installa-tion.Our after-sales service can support you toplan and perform a leak test for your plant.1. Close the valve.2. Slowly apply the test medium to the inletspace upstream of the valve. A suddensurge in pressure and resulting high ve-locities can damage the valve.3. Open the valve.4. Apply the required test pressure.WARNING! WARNING!WARNING! WARNING!WARNING!Tip