Fisher EW Series (EWD/EWS/EWT) Sliding Stem …

1 EW Series (EWD/EWS/EWT) Sliding - stem control valves through NPS 12x8 Fisher EW Series easy-et valves (figures 1, 2, 3, 4,and 5) feature large internal cavities with expandedend connections and a variety of unbalanced andbalanced plug designs. Sizes available from NPS4x2(1) through 12x8. These combinations providegood fluid control in economical, high-capacity valvebodies that keep valve outlet velocities withinpractical valves meet a variety of service requirements,such as power plants where oversized piping is usedto limit fluid flow velocity. They also perform well innoise abatement applications; for example,high-pressure gas reducing stations where sonicvelocities are often encountered at the outlet ofconventional valve Fisher EW product line is available for a widerange of applications, including sulfide and chloridestress-cracking environments common to the oil andgas production industries.

2 To discuss availableconstructions, contact your Emerson ProcessManagement sales office and include the applicablecodes and standards required for easy-e Valve FamilyEW Series valves are part of the versatile easy-efamily of Fisher industrial control valves . easy-evalves share the following characteristics:DMultiple trim material choicesDTrim temperature capability with metal seatsstandard to 427_C (800_F)DInterchangeable, restricted-capacity trims andfull-size trims to match variable process flowdemandsW2777-3 / ILFigure 1. Fisher NPS 12x6 EWT or EWD Valve with 667 ActuatorDDifferent cage/plug styles that provide particularflow characteristics for highly-specializedapplications. The standard cage comes in threedifferent flow characteristics:Dquick-openingDlinearDeq ual percentageDCavitrolt III cages are available to eliminatecavitation damage and Whisper Trimt III cages areavailable to help attenuate aerodynamic stainless steel packing box parts arestandard (including packing flange, studs, and nuts)1.

3 Valve body size: end connection size by nominal trim size. For example, an NPS 4x2 EWD valve has NPS 4 end connections with effective 2 inch :EWD100023X012 February 2011EW ValveEW ValveProduct :EWFebruary 2011 2 ContentsFeatures Trim Description and HIGH-SEALP acking Systems Configurations Selection Guidelines Class VI ShutoffCapabilities TSO (Tight Shutoff) TrimCapabilities Trim Part Materials for Compatibility with NACE MR0175-2002(Sour Service) Specifications,Environmental Restrictions Apply,Refer to Standard Valve Constructions Classifications Shutoff Classification Trim Part Combinations VI Shutoff Availability VI Trim Materials Leakage Class Shutoff Availability Diameters, Valve Plug Travel, YokeBoss Diameters for TSO Trim Trim Temperature Capabilities Metal Trim Part Combinations Metal Trim Part Combination Temperature Capabilities Trim Part Combinations (Whisper Trim) Trim Temperature Capabilities(Whisper Trim) Trim Part Combinations (Whisper Trim)

4 And Temperature Limitationsfor Other Parts Specifications Weights Selection Guidelines Materials and Temperature Limits with NACE MR0175-2002 temperature limits of EWT valves can beextended above 232_C (450_F) by using PEEK(PolyEtherEtherKetone) anti-extrusion rings incombination with a spring-loaded PTFE seal. ThePEEK anti-extrusion rings expand to close off theclearance gap between the plug and the cage wherethe PTFE seal may extrude at high temperaturesand pressures. The temperature limits are extendedto 316_C (600_F) for non-oxidizing service and to260_C (500_F) for oxidizing to Fisher bulletin :EWN(D100024X012) for information on EWNS eries valves with Whisper Trim to Fisher bulletin :010(D102362X012) for information onWhisperFlot Aerodynamic NoiseAttenuation with the Clean Air Act ENVIRO-SEAL packing systems provide animproved stem seal to help prevent the loss ofvaluable or hazardous process fluid.

5 TheENVIRO-SEAL packing systems feature PTFE orGraphite ULF packing with live-loading for reducedpacking Attenuation In an EW Series valve,noise produced by high flow rates and largepressure drops can be reduced by up to 18 dbA witha Whisper Trim I cage, by up to 30 dbA with aWhisper Trim III cage, and by up to 40 dbA with aWhisperFlo Economy Expanded end connectionsof EW Series valve bodies may reduce the need forline swages while accommodating oversized pipingarrangements used to limit fluid flow ValveProduct :EWFebruary 2011 3 NOTE:THE NPS 10x8 VALVE IS SIMILAR IN APPEARANCE TO SIZES through NPS , THE NPS 10x8 USES THE LOAD RING SHOWN FOR THE NPS DOES NOT USE THE CAGE 12x8 CONSTRUCTIONLOAD RINGCAGERETAINERTYPICAL OF CONSTRUCTIONS through NPS 12x6 SEATRINGGASKETSEATRINGCAGEVALVEPLUGGRAPH ITE PISTONRINGPTFE V RINGPACKINGPINBONNETGASKETSHIMSPIRALWOUN DGASKETW9035W9036 Figure 2.

6 Fisher EWD Valve with Standard CageDTemperature Compensation On designswith the seat ring threaded into the valve body(figure 5), the hung cage feature helps reducegasketing problems caused by thermal expansionand contraction of long parts, such as the Trim Parts across the easy-eproduct line Included are FGM gaskets, packingflange, studs, and , Class IV or Class VShutoff Optional multiple piston rings (figure 15)for EWD and EWD-1 valve bodies permit Class IVshutoff up to 593_C (1100_F).Use of C-seal trim for EWD (see figure 6) permitsClass V shutoff up to 593_C (1100_F).DIncreased Pressure/TemperatureRatings NPS 12x8 CL900 EW Series valve bodieswith buttwelding end connections are capable ofincreased ASME ratings called IntermediateStandard Ratings. The extra strength of the valvebody allows these valves to be used wherepressures and temperatures exceed Standard Classratings in ASME Bulletin :027, Increased Pressure/Temperature Ratings for EH and EW Series SteelValves (D100076X012), for further Service Capability Unless otherwisenoted, references are to NACE materials are available to meet NACEMR0103 and NACE MR0175 / ISO 15156.

7 Materialrequirements under these standards vary by editionand year of issue; the specific standard must Trim DescriptionC-seal trim (figure 6) is available for valves with portdiameters from inches through 8 C-seal trim, a balanced valve can achievehigh-temperature, Class V shutoff. Because theC-seal plug seal is formed from metal (N07718 nickelalloy) rather than an elastomer, a valve equippedwith the C-seal trim can be applied in processes witha fluid temperature of up to 593_C (1100_F).EW ValveProduct :EWFebruary 2011 4 STANDARD CONSTRUCTION (SEAT PARTS ALSO TYPICAL OF OPTIONAL EWS PTFE SEATING)SOFT BACKUPRINGSEALRINGMETAL DISCRETAINERPTFEDISCMETALDISC SEATRETAININGRINGMETALBACKUPRINGSEAL RING(SHOWN POSITIONEDFOR USE WITHSTANDARD ANDCAVITROL CAGES)SEAL RING(SHOWN POSITIONEDFOR USE WITHSTANDARD ANDCAVITROL CAGES)137 mm ( INCH)AND SMALLER PORTS178 mm (7 INCH)AND LARGER PORTSVALVE PLUG WITH OPTIONAL PRESSURE-ASSISTED SEAL RINGW0992 3 / ILW0995 2 / ILW2914 1 / ILFigure 3.

8 Fisher EWT Trim DetailsENVIRO-SEAL and HIGH-SEALP acking SystemsFisher ENVIRO-SEAL and HIGH-SEAL packingsystems (figure 19) offer excellent sealingcapabilities. These systems easily install in yourexisting valves or can be purchased with newvalves. These systems help you seal your process toconserve valuable process fluid and to protect theenvironment against the emission of hazardous orpolluting fluids. The long-life and reliability of thesesystems also reduce your maintenance cost applications requiring compliance withenvironmental protection regulations, the uniqueENVIRO-SEAL packing system and, for hazardousservice, the ENVIRO-SEAL bellows seal bonnet(figure 20) are offered. The emission control packingsystem or seal bonnet keeps emissionconcentrations below the EPA 100 ppm an excellent stem seal in applications that arenot environmentally-sensitive, the HIGH-SEALG raphite ULF packing system is offered.

9 TheHIGH-SEAL packing system provides excellentsealing at pressure/temperature ratings beyondENVIRO-SEAL METALSEAT RINGW0989 2/ILFigure 4. Fisher EWS Trim Details Showing Standard Cageand Seating ConstructionENVIRO-SEAL packing systems, available withPTFE, Graphite ULF, or Duplex packing, and theHIGH-SEAL Graphite ULF packing system featurelive-loading and unique packing-ring arrangementsfor long-term, consistent sealing ValveProduct :EWFebruary 2011 5 SEAL RING(SHOWNPOSITIONEDFOR USEWITHSTANDARDCAGES)THREADEDSEAT RINGW9037 Figure 5. Fisher NPS 12x8 CL900 EWT-1 ValveEW ValveProduct :EWFebruary 2011 6 PISTONRINGRETAINERVALVE PLUGFLOW DOWNFLOW UPC-SEALMETALPLUGSEAL(1)STAKE THREADC-SEALMETALPLUGSEAL(1)1. REVERSE THE ORIENTATION OF THE C-SEAL PLUG SEALFOR PROPER SHUTOFF WHEN VALVE IS USED IN A PROCESSWITH DIFFERENT FLUID FLOW :A6869 / ILFigure 6. C-seal TrimVALVE PLUGSEALPROTECTEDSOFT SEATA7096 / ILFigure 7.

10 Typical Balanced TSO TrimEW ValveProduct :EWFebruary 2011 7 Table 1. Metal Trim Part Materials for Compatibility with NACE MR0175-2002 (Sour Service) Specifications, Environmental Restrictions Apply, Refer to StandardTrim DesignationValve PlugCageSeat Ringfor Standard MetalSeat ConstructionDisk Seat andRetainer forOptionalPTFE-SeatConstructionValve stem , PackingFollower, Lantern Ring,Packing Box Ring, andPinLoad Ring(1)85(3)S31600S31600 withelectroless nickelcoating (ENC)S31600 S20910 (Valve stem )S31600 (All Other Parts)N0550085C(2,3)S31600S31600 withelectroless nickelcoating (ENC) S3160086(3)S31600 with seathard faced withCoCr-A hardfacingalloyS31600 withelectroless nickelcoating (ENC)R30006 (alloy 6) 87S31600 with seatand guide hardfaced with CoCr-Ahardfacing alloyS31600 withelectroless nickelcoating (ENC)R30006 (alloy 6) 87C(2)S31600 with seatand guide hardfaced with CoCr-Ahardfacing alloyS31600 withelectroless nickelcoating (ENC) S316001.