Fisher EH and EHA Control Valves - …

1 EH and EHA Control ValvesW4182 1W4589W9768 1 Figure 1. Fisher EH and EHA Control ValvesProduct :EHD100042X012 January 2011EH and EHA ValvesEH and EHA ValvesProduct :EHJanuary 2011 2 ContentsEH Series Valves 1-1/2 x 1 through 6 Globe ValvesNPS 3 through 8 Angle Valves ( nps 1 -1/2 x 1 through 6 GlobeValves, NPS 3 through 8 Angle Valves 8 through 14 Globe Valves of Operation(NPS 8 through 14 Globe Valves ) 20 Globe Valves Design Capability(NPS 20 Globe Valves ) Trim Description Seal Trim Description TSO (Tight Shutoff)Trim Capabilities Selection Guidelines Selection Guidelines Limits Chart Flow Coefficients (NPS 8 to 14) Valve Configurations and Sizes Sizes and End Connection Styles Pressure/Temperature Ratings Diameters, Valve Plug Travel, YokeBoss Diameters for TSO Trim Classifications Material Combinations Materials and TemperatureCapabilities Plug Travel (NPS 8 to 14))

2 Specifications Boss and Valve Stem Diameters Pressure Drop Limits 1. Availability ChartValve Size,NPS(1)CL1500CL1500 IntermediateCL2500CL2500 Intermediate1-1/2 x 1- - -- - -EHSEHS2 x 1- - -- - -EHS- - -2- - -- - -- - -EHD, EHS, EHT3 x 2- - -- - -EHD, EHS, EHTEHD, EHS, EHT3 EHAT, EHADEHAD, EHAS, EHATEHD, EHS, EHTEHAD, EHAS, EHATEHD, EHS, EHTEHAD, EHAS, EHAT4 x 3- - -- - -EHD, EHS, EHT- - -4 EHAT, EHADEHAD, EHAS, EHATEHD, EHS, EHTEHAD, EHAS, EHATEHD, EHS, EHTEHAD, EHAS, EHAT6 x 4- - -- - -EHD, EHS, EHT- - -6 EHAT, EHADEHAD, EHAS, EHATEHD, EHS, EHTEHAD, EHAS, EHATEHD, EHS, EHTEHAD, EHAS, EHAT8 x 6- - -- - -EHD, EHS, EHT- - -8 EHD, EHT,EHAD, EHAS, EHATEHD, EHTEHAD, EHAS, EHATEHD, EHTEHAD, EHATEHD, EHT10 x 8 EHD, EHTEHD, EHTEHD, EHTEHD, EHT12 EHD, EHTEHD, EHTEHD, EHTEHD, EHT14- - -- - -EHD, EHT- - -14 x 12 EHD, EHTEHD, EHTEHD, EHTEHD, EHT16 x 14- - -- - -EHD.

3 EHT- - -20 EHD- - -EHD(2)- - -1. Two numbers indicate end connection by nominal valve size. For example, 3 x 2 indicates 3 inch end connection with NPS 2 valve CL2185EH and EHA ValvesProduct :EHJanuary 2011 3EH (globe)JEHS ( nps 1 -1/2x1 through 8x6), JEHD (NPS 2through 20), and JEHT (NPS 2 through 16x14)EHA (angle)JEHAS (NPS 3 through 8), JEHAD (NPS 3through 8), and JEHAT (NPS 3 through 8)EH Series ValvesThese Valves (figure 1) are specially designed forhigh-pressure applications. Fisher EH valveconfigurations incorporate proven techniques inflow-stream contouring for higher capacities and invalve trim design for reliability in severe temperature limits of EHT Valves can beextended above 232_C (450_F) by using PEEK(PolyEtherEtherKetone) anti-extrusion rings incombination with a spring-loaded PTFE seal.

4 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 otherwise noted, all NACE references are toNACE MR0175-2002. Contact Emerson ProcessManagement for information on NACE MR0175/ISO15156 or NACE Cage Design Drilled-hole cages,offering excellent strength and additional resistanceto destructive vibration, are standard. Specialmaterials of construction are readily Seat Ring Gasket Construction Useof O-ring construction provides excellent shut-off withminimal seat ring installation torques fortemperatures up to 232_C (450_F). O-ringconstruction is standard on EHT Valves .

5 The O ringseat ring gasket construction is available forelevated design temperatures and/or NACE constructions where a suitable O ring material is Pressure/TemperatureRatings Steel EH and EHA Valves with buttweldingend connections have Intermediate StandardRatings. With nondestructive testing, these valvescan conform to ASME Intermediate Special Ratings,which allow even higher pressure/temperatureapplications. See tables 7 and 8 for specific Trim Life Hardened materials ofconstruction for the cage, valve plug, cage guiding,and other trim parts are standard for all applications,providing excellent wear resistance. In allapplications, rugged cage guiding providesincreased valve plug stability. Increased stabilityresults in reduced vibration and other mechanicalstresses, which contributes to long trim Economy The availability ofexpanded end connections on EH Valves mayeliminate the need for line swages whileaccommodating oversized piping of Low Flow Rates/Tight Shut-off Micro-Form or Micro-Flute valve plugs (figure 6 or 7)provide superb rangeability in high-pressure,low-flow applications.

6 A choice of several restrictedport diameters helps match valve capacity torequired flow, helps provide necessary Control withfull travel, and helps prevent throttling near the EHA Valves only, and in low-flow applicationswhere cavitation damage may occur, the Micro-Flatstyle valve plug can be used. For low-flowapplications where cavitation damage may occurand the minimum required Cv is equal to or greaterthan , Cavitrolt III with Micro-Flat trim can beused in both EH and EHA Valves . Please contactyour Emerson Process Management sales office formore soot blower applications, a special trim design isavailable to address noise, vibration, tight shutoff,and thermal cycling which is seen in this contact your Emerson Process Managementsales office for more , Class V Shutoff Use ofthe metal C-seal (see figure 21) permits Class Vshutoff up to 593_C (1100_F) for up to 4-3/8 inchport.

7 The metal Bore Seal trim will permit Class Vshutoff up 593_C (1100_F) for 5-3/8 inch ports Stem Sealing HIGH-SEAL packingsystems provide excellent sealing to conserveEH and EHA ValvesProduct :EHJanuary 2011 4valuable or hazardous process fluid and to protectagainst the emission of hazardous or polluting fluidsto atmosphere. This system (figure 2) featuresgraphite packing material and heavy-duty 2. Typical HIGH-SEAL Packing SystemW4434-2*SEAT RINGRETAINERSEAT RINGVALVEBODYO-RINGLAMINATEDGRAPHITEGASK ETSEAT RINGRETAINERSEAT RINGVALVEBODYO-RING GASKET CONSTRUCTION,STANDARD CONSTRUCTIONFOR EHT, CAVITROL TRIMS,AND SOUR SERVICELAMINATED GRAPHITE GASKETCONSTRUCTIONNOTES:PREFERRED FOR ALL OTHER BODY CONSTRUCTIONSWHERE TEMPERATURE 3. Seat Ring Gasket ConstructionsDHigh Capacity Careful consideration ofaerodynamic and hydrodynamic principles in thedesign of the flow stream passages results in 30 to40 percent higher capacity than conventional valveswith comparable port sizes and 2.

8 Liquid Flow Coefficients, Cv, at Maximum Travelwith Equal Percentage Cage (Modified EqualPercentage Characteristic) (NPS 8 through 14 Valves )(1)VALVEDESIGNPRESSURERATINGVALVE SIZE, NPS8 and 10x812 and 14x12 EHD, EHTCL15009121830CL250058410101. See the section titled Coefficients in this bulletin for additional sizing Thermal-Cycle Life The seat ringdesign minimizes operational stresses, therebyreducing chances of distortion and resultant leakagecaused by temperature cycling. The hung cagedesign allows thermal expansion of the cage withoutaffecting the seat ring gasket Economy Balanced trimconstructions reduce forces acting on the valve plug,thus reducing actuator thrust requirements andpermitting the use of smaller actuators. This,combined with capacities higher than comparablypriced globe Valves , makes the NPS 8 through 14(including 14x12 and 16x14) EH Series Valves veryeconomical for high-pressure, high-flow selection for NPS 20 Valves can be madefrom electromechanical or electrohydraulic stylesthat use readily available power All aspects of the Control valve(material selection, trim components, packing, andcontrol accuracy) are designed, built, and tested toassure performance and reliability.

9 Extensivemetallurgical evaluation results in state-of-the-artcage, valve plug, and stem materials that helpensure trim life and dependable Accuracy The NPS 20 cage andvalve plug deliver accurate Control of high pressureand high capacity flow. Each cage has milledopenings and is flow tested for the required flowcharacteristic. With precise, accurate cage openings,accurate installed characteristics result; Valves inparallel have the same flow at the same plugposition. The cone-shaped plug reduces fluidturbulence, helps ensure plug stability, and aidspositioning Maintenance The bonnet lifts off toallow trim access. The separate seat ring and cageallow parts removal and maintenance. The globeconfiguration reduces the uneven trim wear andresultant maintenance downtime normally associatedwith slant configurations.

10 Installation with the stemvertical above the bonnet also makes trim removal andinstallation and EHA ValvesProduct :EHJanuary 2011 5W3387 Figure 4. NPS 3 Fisher EH Valve with 657 ActuatorW3379-1 Figure 5. Fisher EHD Valve Body AssemblyDControl Flexibility Special cagecharacterization (standard, Whisper Trimt, orCavitrol trim) can be supplied to satisfy almost anycombination of flow and noise or cavitationabatement. Cage characterization and efficient flowpassages provide close Control for low flow, highpressure drop conditions as well as high flow, lowpressure drop conditions. A choice of actuator stylesallows wide selection of power and 1-1/2 x 1 through 6 Globe Valves NPS 3 through 8 Angle ValvesEH Series Valves (figure 4) offer higher capacities,rugged cage guiding, hardened trim materials, andare available with special trims for noise attenuationand cavitation abatement.