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Nominal end size (mm)

Feed Water Heater - Isolation System

Quick Guide to Product Numbering Systems

Minor design change NNon return T/PStandard flow S/RVenturi Ancillary valve arrangement Pressure class Valve type BOne by-pass COne equalizing by-pass DOne by-pass & one equalizingby-passFNo by-pass GEqualizing pipe HVee port seat JOne by-pass & one by-passdrain valveKOne drain valve LOne equalizing pipe & one drainvalveMVee port seat & equalizing pipe End Connection Even number–Flanged Odd number–Butt weld Body material DASTM A105 EASTM A216 Gr WCB JASTM A217 Gr WC6 KASTM A182 Gr F22 LASTM A217 Gr WC9 RASTM A217 Gr C12A 21/22–150 Class 31/32 –300 Class 51/52 –600 Class 67 –1000 Class 73 –1690 Class 8A–1715 Class 83 –2260 Class 91 –2500 Class 95 –2850 Class X7 –4500 Class AAutomatic bypass valves BBled steam check valve C ELeak off valve FTilting disc check valve/Swingcheck valveG K LAutomatic non-return valves MStop valves NScrew down non-return valves PParallel slide valves RReheater Isolators T USpecial products WFeed heater isolators YFeed water heater divertor ZMiscellaneous Valve operation on speciality ABevel gear op. from below BBevel gear op. from above CChain Wheel DHydraulic actuator EDirect mtd. Limitorque FSleeve coupling GBevel gear local operation HLocal handwheel operation LLocking device MAdaptor plate NPneumatic actuator PSpur gear op. from below QSpur gear op. from above RDirect mounted Rotork TUniversal joint UUndrilled or block ends withhandwheelVSpecial WPower assisted YDirect mtd. Auma actuator ZNo external operator

Dewrance Control Valves Model A73-W/Y8A - 6278 W8AED300 P F DA

Minor product variation By-pass operation ABevels op. from below BBevels op. from above CChain wheel DNo by-pass EDirect mtd. Limitorque actuator FSleeve coupling GLocal op. through bevel gear HLocal handwheel LLocking device N PSpur gear op. from below QSpur gear op. from above RDirect mtd. Rotork actuator YDirect mtd. Auma actuator
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