Valtek Mark One - Flowserve

1 Valtek Mark Onefor Power Services2 Valtek Mark One-PowerFlowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611 The Valtek Mark One-PowerTM globe control valveoffers superior performance in liquid and gaseous ser-vices, while permitting easy, fast and inexpensive main-tenance in power Valtek Mark One-P is the ideal choice for hightemperature and pressure applications, which demandprecise throttling. Factory Mutual approval for use as afuel service valve and ASME N stamp also adds to itsversatility in power diaphragm-operated control valves, the springcylinder-actuated Valtek Mark One-P provides stiffnessand maintains high-positioning accuracy, repeatability,controlled high speed and faithful response.

2 Intensefluid pressures are easily controlled by the compact, yetpowerful design. Each actuator is capable of utilizingsupply pressures up to 150 psi ( Bar).Most diaphragm actuators rely entirely on springs toclose the valve. The Valtek Mark One-P's spring, supplyair pressure and fluid pressure combine to produceexceptionally tight shutoff. A heavy-duty, one-pieceplug and self-aligning seat ring further enhance theshutoff capability of the Valtek Mark clamped-in seat, top-entry trim also permit easy,quick maintenance.

3 A high degree of parts interchange-ability results in fewer inventory parts. The actuator islighter, smaller and easier to handle than comparablediaphragm Valtek Mark One-Power control valve is the idealcontrol valve solution for power 1: Valtek Mark One-PowerTM Control ValveSOE0037 Four-way Positionerfor PositioningAccuracyInterchangeabilityCla ss 600 bodyFail-safe SpringHeavy-DutyStem GuidingLarge Diameter,One-PiecePlug StemReversible PistonActuatorClamped-in Seat Ring3 Valtek Mark One-PowerFlowserve Corporation, Valtek Control Products, Tel.

4 USA 801 489 8611 The Valtek Mark One-Power control valve offers solutions to many power services challenges. Five basicconfigurations (globe, angle, three-way, expanded outlet and Y-body) can be used in various steam, water, fueland chemical applications. Several anti-cavitation and noise reduction trims, full ASME N capability and FM fuelvalve approval also expand the service usability of the Valtek Mark Control Valve ProblemMark One-Power SolutionYoke breaksDuctile iron yokes are highly resistant to breakagePlug head comes off;One-piece plug head and stem.

5 Stems are heavy-duty at least twostems breaktimes the diameter of most manufacturers' stemsValve leaksDouble-acting, high-thrust cylinder actuator allows most applications toavoid pressure-balanced trims and to use the fluid to assist valve closure;self-centering seat assures tight shutoff with no lapping required;Alloy 6 hard facing or 416 stainless steel heat treated trim reduces wiredraw and seat surface damageActuators destroyed byActuators are available with Viton O-rings for operation to 350 F / 177 C;high temperatures high-temperature positioners are also availablePacking leaksHeavy-duty.

6 Double top stem guiding eliminates lateral stem movement increasing packing lifeDifficult to attach plug andThreaded actuator stem and one-piece stem clamp makes assemblyactuator stem quick and easyHard to remove seat or retainerClamped-in seat allows for easy removal no corroded threads to hinderservice workDifficult to remove yoke/Two stainless steel half-clamps make actuator removal easy even afterbonnet nut years of serviceSpace constraints in existingCompact actuator design assures the valve will fit in the existing spacepipingLarge spare parts stock requiredGreater interchangeability such as three standard actuators and a mini-mum Class 600 body reduces the amount of spare parts requiredSevere service applicationsThe Valtek Mark One-P valve can easily be engineered with severewithin the plant service trims: CavControlTM, ChannelStream ,MegaStreamTM and Tiger-ToothTM.

7 Body and trims are available in mostmaterials to meet application requirementsDifficult to serviceThe Valtek Mark One-P valve has top-entry trim, a clamped-in seat ring,and one-third the parts of other manufacturers valves; actuator islightweight and easier to handle than diaphragm flow controlSpring cylinder actuator with 4-way positioner accepts 150 psi / Barair supply ensuring high thrust, low hysteresis and low repeatabilityValtek Solution4 Valtek Mark One-PowerFlowserve Corporation, Valtek Control Products, Tel.

8 USA 801 489 8611 SOE0038 ComponentsFigure 2: Valtek Mark One-Power Control ValveAdjusting ScrewSpringPiston Stem O-ringCylinderPistonPiston O-ringYoke O-ringStem ClampGland FlangeUpper PackingYoke ClampPacking SpacerBonnetBonnet FlangeAdjusting Screw GasketSpring ButtonPiston Retaining NutActuator Stem SpacerActuator Stem BushingActuator Stem O-ringActuator StemCylinder Retaining RingStroke PlateStem BellowsYokeUpper Stem GuideBonnet FlangeBoltingLower PackingBonnet GasketLower StemGuidePlugSeat RetainerSeat RingSeat RingGasketBody5 Valtek Mark

9 One-PowerFlowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611 Figure 5: Angle-style BodyThe Valtek Mark One-Power can be easily adapted toan angle style body all other valve parts remain thesame. For additional protection of the body, a specialventuri seat ring, which extends to the outlet flange, isavailable if StylesFigure 6: Expanded Outlet BodyWhen a small control valve is needed in a large pipe,the expanded outlet body can be used all other partsare interchangeable with the globe body.

10 Manypower plants use this valve design in heater 3: Globe-style BodyGlobe-style bodies feature smooth, streamlined, con-stant area internal passages with no pockets, permittinghigh capacity with minimum turbulence. They aredesigned with nearly constant wall thickness, providinglower weight and cost when the body is manufactured inexpensive stainless or alloy 4: Three-way BodyThree-way bodies are used for either combining ordiverting services. Due to excellent parts interchange-ability, a standard globe valve easily converts tothree-way service with the addition of a three-wayadaptor, upper seat ring, two gaskets and a Mark One-PowerFlowserve Corporation, Valtek Control Products, Tel.