Samson 3271 Mounting And Operating Instructions

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Samson 3271 Mounting And Operating Instructions Manual pdf 17 page image

EB 8052 EN 3-3Design and principle of operation3.1 VersionsWith insulating section/bellows sealThe modular design allows an insulating sec-tion or bellows seal to be fitted to the stan-dard valve version.ActuatorsIn these instructions, the preferable combina-tion with a SAMSON Type 3271 orType 3277 Pneumatic Actuator is described.The pneumatic actuator (with or withouthandwheel) can be replaced by anotherpneumatic actuator in a different size, butwith the same travel.Î Observe the maximum permissible actu-ator force.If the travel range of the actuator is largerthan the travel range of the valve, the springassembly in the actuator must be preloadedso that the travel ranges match. See associ-ated actuator documentation.The basic pneumatic actuator can be re-placed by an actuator with additional hand-wheel, a pneumatic piston actuator or anelectric actuator (see Information Sheetu T 8300).3.2 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 line ensures that the plantdoes not need to be shut down for serviceand repair work on the valve.InsulationControl valves can be insulated to reduceheat energy transfer.Refer to the instructions in the 'Installation'section.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).Safety guardFor operating conditions, which require in-creased safety (e.g. in cases where the valveis freely accessible to untrained staff), a safe-ty guard must be installed to rule out a crushhazard arising from moving parts (actuatorand plug stem). Plant operators are responsi-ble for deciding whether a guard is to beused. The decision is based on the risk posedby the plant and its operating conditions.Note