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Valtek Mark OneValtek Mark OneControl Valves1

Valtek Mark OneBody AssemblyModular Piston Actuator:Three standard sizes covermost valves. Each is easilyreversible. Stiffness,repeatability, low hysteresis.Fail-Safe SpringOHeavy Guiding:Two widely spacedguides on large-diameterstem. Plug does notguide in retainer.Interchangeability:Class 600 body used forClass 150, 300 and 600ratings through 4-inch.SPerformance:Positioning accuracyto .002 inch. Extremelyhigh thrust.Clamped-In Seat Ring:Valve may be disassembledquickly and easily byremoving bonnet bolts.Figure 1: Mark One Body Assembly – Class 150, 300 and 600The Valtek Mark OneTM globe control valve offers superiorperformance in liquid and gaseous services, while alsopermitting easy, fast and inexpensive maintenance.Unlike diaphragm-operated control valves, the springcylinder actuated Mark One provides stiffness andmaintains high positioning accuracy, repeatability, controlled high speed and faithful response. The Mark Onehandles up to 150 psig / 10.3 Barg supply air and has thethrust to shut off against much higher fluid pressures.Most diaphragm actuators rely entirely on springs toclose the valve, but the Valtek Mark One is designed sothe spring, supply air pressure and fluid pressure itselfcombine to produce exceptionally tight shutoff. A selfaligning seat ring further enhances the shutoff capability of the Mark One.2Many globe valve maintenance problems can be tracedto cage-guiding. The close metal-to-metal contact between the cage and plug often result in galling andsticking. The Mark One, however, is double top-stemguided and completely avoids contact between the plugand seat retainer.The clamped-in seat and top-entry trim permits easy,quick maintenance. Plus, with Mark One’s high degreeof parts interchangeability, fewer inventory parts arerequired. In addition, the actuator is lighter, smaller andeasier to handle than comparable diaphragm actuators.The Valtek Mark One is the industry choice for a simple,reliable, tough globe valve.

Valtek Mark OneAdvantages and FeaturesAdvantagesFeaturesReliable, predictable serviceStiff, high-thrust cylinder actuatorAccurate positioningHigh repeatabilityFaithful responseControlled, high-speed stroking actionWon’t stick and shut downCage guiding eliminatedDouble stem guiding located out of flow streamGenerous clearance between plug head and seat retainerEasy, fast and inexpensiveTop-entry servicingClamped-in seat ringEvenly compressed gasket – controlled gasket compressionSeparable flangesHigh degree of parts interchangeabilitySmall, lightweight designLeakproof when closedHigh-thrust, spring-cylinder actuatorSelf-aligning seat ringAssisted shutoff from fluid pressure, cylinder spring, cylinder pressureSpring fails valve to desired position, pneumatics provide additional forceBuilt for toughest serviceCorrosion-resistant constructionHigh thrust overcomes high pressuresAnti-cavitation and noise-trim optionsHeavy-duty plug stemFactory mutual approved as a fuel service valve (3/4 - 3-inch)Compact and easy to installCylinder actuator is smaller than comparable diaphragm actuatorsLower center of gravity than comparable diaphragm actuatorsLight weight means less pipe stress from static and dynamic loadsSeparable end flanges allow the valve to be installed in manyorientations and compensate for flange misalignmentDesign provides lowertotal lifetime costHigh interchangeability between sizes and other Valtek control productsValve design minimizes requirements for stocking spare partsRugged, heavy-duty parts provide extended lifeActuator design allows simple, easy maintenance3

Valtek Mark OneComponentsAdjusting Screw GasketAdjusting ScrewSpring ButtonSpringPiston Retaining NutPiston Stem O-ringActuator Stem SpacerCylinderActuator Stem BushingPistonActuator Stem O-ringPiston O-ringActuator StemYoke O-ringCylinder Retaining RingStem ClampOStroke PlateGland FlangeStem BellowsUpper PackingSYokeYoke ClampUpper Stem GuidePacking SpacerUpper Stem Guide LinerBonnetBonnet FlangeBoltingBonnet FlangeSeat RetainerLower PackingSeat RingBonnet GasketSeat Ring GasketLower Stem GuideBodyLower StemGuide LinerHalf RingPlugEnd FlangeFigure 2: Mark One Control Valve4

Valtek Mark OneBody StylesFigure 3: Globe-style BodyFigure 4: Three-way BodyGlobe-style bodies feature smooth, streamlined,constant-area internal passages with no pockets,permitting high capacity with minimum turbulence. Theyare designed with nearly constant wall thickness,providing lower weight and cost when manufactured inexpensive stainless or alloy steels.Three-way bodies are used for either combining ordiverting services. Due to Flowserve’s excellent partsinterchangeability, a standard globe valve easily converts to three-way service with the addition of a threeway adaptor, upper seat ring, two gaskets, three-wayplug and longer bonnet flange studs.Figure 5: Angle-style BodyFigure 6: Steam-jacketed Body1Except for the body and 1 /2-inch seat ring, the anglestyle Mark One is completely interchangeable with theglobe style – all other valve parts remain the same. Foradditional body protection, a venturi seat ring, extending to the outlet flange, is available.The steam-jacketed Mark One uses a standard globestyle body with oversized, blind flanges for a full jacketor standard flanges for a partial jacket. The jacket israted for 150 psig / 10.3 Barg and is equipped with a3/4-inch NPT supply and drain connection.5

Valtek Mark OneEnd Connections, Flanges and BoltingMark One body facings come standard as raised face for eitherseparable and integral flanges. To achieve better sealing withmating piping, the flange face is machined with spiral groovedserration. Other optional facings include smooth face, flat face,ring joint, large and small tongue, and large and small groove.Separable End FlangesInterchangeable separable flanges are standard for valve bodies 1/2- through 4-inch in class 150, 300 and 600 ANSI ratings,and for 6- and 8-inch bodies in Class 300 and 600. Withseparable end flanges, a class 600 body can be adapted forClass 150, 300 or 600 service by simply changing the e flanges are usually furnished in carbon steel formaximum cost savings, although stainless steel can be specified if needed.Bonnet FlangeThe bonnet flange incorporates the same separable design asthe end flanges and is normally manufactured in carbon steel;however, it can be specified in stainless steel when required.Bonnet Flange BoltingClass 150End FlangeClass 600BodyFigure 7:Separable End and Bonnet FlangesAll sizes use studs and nuts that are furnished in 304 and 316stainless steel, suitable for -423 to 1500 F / -253 to 816 C.These temperature limits are for maximum pressure permittedby ANSI B16.34, 1988.Table 1: End ConnectionsEnd ConnectionSeparable tionalFaceto-Face/2 - 4150 - 600ANSI (a)ISA6-8300 - 600ISA (b)Integral Flange –1/2 - 48150ISASteel & Alloys1300 - 600ISA/2 - 481/2 - 24ScrewedSocketweldButtweld900 - 2500ISA (c)1/2 - 2150 - 600ANSI1/2 - 2900 - 2500ISA (c)1/2 - 2150 - 600ANSI1/2 - 2900 - 2500ISA (c)1/2 - 4150 - 600ANSI6 - 36150 - 600ISA900 - 2500ISA (c)1/2 - 246ISAClass 300Class 600Figure 8: End FlangesISA(a) ANSI B16.10 Class 600 globe valves(b) ANSI/ISA S75.03, 1985(c) See Table 20

Valtek Mark OneGaskets and ClampsThe Mark One is designed with the bonnet and seat ringgaskets fully retained. Since the bonnet bottoms metalto-metal in the body, the bonnet gasket compression isdetermined by the depth of the gasket step on thebonnet, which is machined to provide the requiredgasket compression.When the bonnet is fully installed, force is transmittedthrough the seat retainer to secure the seat ring inposition. The body, seat retainer and seat ring are allmachined to close tolerances to provide the propergasket compression. Unlike the bonnet, the seat ringdoes not bottom in the body, allowing this smallclearance to compensate for manufacturing tolerances and thermal expansion.Bonnet GasketSeat RingGasketFigure 9: Body GasketsTable 2: Gasket SpecificationsTypeGasket MaterialMaximumGasketTemp. F / CMinimumGasketTemp. F / CStandardFlatTeflon (TFE)350 / 177-200 / -130GasketsSpiral Wound304 S.S./AFG750 / 400-20 / -30Spiral Wound316 S.S./AFG1000 / 538-20 / -30FlatAFG600 / 318-20 / -30FlatKEL-F350 / 177-320* / -196*AlternateFlatTeflon (FEP)400 / 204-320 / -196GasketsFlatGrafoil**1500** / 816**-320 / -196Spiral Wound316 S.S./Grafoil**1500** / 816**-320 / -196Hollow O-ringInconel X-7501500 / 816-20* / -30**Lower temperature available upon request.**Limited to 800 F / 427 C for oxidizing service.Yoke ClampsThe actuator is typically attached to the Mark One bodyassembly with two precision-cast, stainless steel yokeclamps. In some cases, however, the actuator is bolteddirectly to the bonnet. Each clamp has an inclined planesurface which, when bolted together, securely fastensthe actuator yoke to the bonnet. Unlike conventionalthreaded clamps, the Flowserve clamp design permitseasy removal even under extremely corrosive conditions.Associated bolts and locknuts are supplied in platedcarbon steel, although stainless steel is also availablewhen required.YokeClampFigure 10: Yoke Clamp7

Valtek Mark OneBonnet TypesStandard BonnetExtended BonnetCold BoxExtended BonnetFigure 11: Mark One Bonnet TypesStandard BonnetThe Mark One bonnet is usually constructed of thesame material as the body and handles temperaturesfrom -20 to 750 F / -30 to 400 C (See table 4 on page9 for packing limitations.)Extended BonnetThe extended bonnet protects the packing fromexcessive heat or cold, which may inhibit valve performance. The bonnet is constructed of carbon steelfor temperatures from -20 to 800 F / -30 to 427 Cand of 304 or 316 stainless steel for -150 to 1500 F /-100 to 816 C.Cold Box Extended BonnetThe cold box extended bonnet permits stagnated, moderate temperature gas to form in the bonnet, whichprotecting the packing from the service fluid. Typicallymanufactured from 304 or 316 stainless steel, it handlestemperatures down to -423 F / -253 C. Standardconstruction consists of stainless steel bonnet flangeand bolting.8Guardian II Formed Metal Bellows SealBonnetThe Guardian II formed metal bellows seal can be usedwhenever service fluid leakage to atmosphere needs tobe reduced to an absolute minimum. The standardmetal bellows seal is rated for operation in processesranging in temperature from -320 F to 1100 F / -196 to 593 C and pressures to 1100 psig / 75.9 Barg.The flexible metal bellows is typically constructed ofInconel 625 and is also available in Hastelloy C-22.The Guardian II bellows seal allows for outside pressureto minimize bellows squirm, prolonging bellows life.Guardian Metal Bellows Seal BonnetThe Guardian metal bellows seal provides protectionagainst unwanted packing leakage to atmosphere inprocesses involving caustic liquids or gases.The compact, lightweight design of the Guardian makesit ideal for services less than 650 F / 343 C and 310psig / 21.4 Barg. The precision-formed bellows is available in Inconel or Hastelloy C materials.Bellows seals are designed for special service conditions and not to valve’s design class; therefore, completeand accurate service conditions must be specified.