Engineered Control Valves - SchuF

1 SchuF Engineered Control Valves Fetterolf +49 6198 571110; +1 843 881 3345; +353 21 4837000 SchuFEngineeredControlValvesfor critical service SchuF Engineered Control Valves Fetterolf +49 6198 571110; +1 843 881 3345; +353 21 4837000 SchuFFor over 60 years, SchuF s Control valveshave performed in the most arduous tasksin the Chemical, Petrochemical, Refining,Mining and Power industries. The Valves areavailable with angle and in-line also offers a wide selection ofspeciality Control Valves ranging frommultistage angle to multiport divertervalves. They include high pressure, hightemperature let down Valves , boiler feedand start up Valves , disc and piston (ram)drain Valves with contoured discs and rams,distributor Control Valves and bellowssealed experience - 3 phase designs reduce or eliminate flashing inthe valve before the seat, thus improvingthe life of body and trim.

2 The disc openingdesign opens into the downstream vessel,ensuring that flashing takes place in an infinite pipe preventing choking andreducing fluid speed. Over the past 20 yearsSchuF has perfected it s proprietary Cvcalculation programme, which is unique init s abilitiy to handle 3 phase flow as well ashigh viscosity, non Newtonian InnovationSchuF s patented x3 bell curve as analternative to linear, equal % or on /offcharacteristics, offers better controllabilityaround operating servedOur Valves are used as let down, level andflow Control , three way mixing anddistributive Control for PTA, Polymers (PET& PBT, PU PVC etc), Coal and Heavy oilupgrading, gasification and liquefaction, salt& brine, Urea, metal slurries, steam handlingand many trim is single or multi-stage, with flow toopen or close. On/off, hollow piston and cagetrim are also s strengths include flexibility of designand construction.

3 We have produced controlvalves in all stainless steels, high Nickelalloys, Titanium and Zirkonium as well asPTFE and glass linings. SchuF uses specialsurface coatings and multiple spindle guidingto improve the resistance against vibrationsand erosion. SchuF also offers solid TungstenCarbide and Ceramic Control Valves come equipped withpneumatic diaphragm actuators (available ina fire-safe version) and piston actuators,while hydraulic and electric actuators areutilised for high pressures and specificcontrol simulationExtensive experienceexists allowingdetailed modelling tooptimise body InformationOur main models are shown in specialproduct 102030405060 SchuF Engineered Control Valves Fetterolf +49 6198 571110; +1 843 881 3345; +353 21 4837000 SchuFPressure and Level Control , 74 BSOriginally designed for PTA 3 phase slurry service thesevalves open into the downstream vessel to eliminatechoking and cavitation.

4 The accelerating body designprevents in body flashing, the single piece disc andspindle with spindle protector stops metal fatigue andspindle bending. The Valves are used in multi-stagereactor or crystalliser arrangements to Control the levelor pressure in the upstream unit. Optinalelectrohydraulic actuators (below) eliminate stickingand Let Down, 74 MSMulti-stage let-down distributes the pressure across twoor more stages, enhancing the life of the trim. Thesevalves are not suitable for high solid content or largeparticles as these can clog the flow path in the seat. Inthe cracking process unconverted oil or residue isdepressurised through a multi-stage Control valve inwhich the vapour fraction flashes out according to itsproperties. This valve may have inlet conditions of 100 C/100~200 bar. A special material venturi is available afterthe last seat if cavitation is Pressure Angle Valve for UreaHigh pressure (200bar working pressure at 200 C) areextensively used in Urea plants.

5 SchuF delivers anglevalves for this service with manual or pneumatic actuation,with on/off or Control trim, as reactor or angle Service Let Down Applications:Let Down, 74 CSIf piping considerations prohibit a disc opening valve,the 74CS offers a disc which opens into the valve. Theeffects of cavitation can be minimised by the use ofsuitable trims ( stellites, ceramics and special grainTungsten Carbides), optimised trim design with easyto replace trim and SchuF s impulse Control include PTA recycling (above) and direct coalliquefaction where the residue is let down progressivelyfrom pressures over 200 bar in the HHP separator tovacuum in the distillation unit at temperatures up to500 C. SchuF Engineered Control Valves Fetterolf +49 6198 571110; +1 843 881 3345; +353 21 4837000 SchuFIn-line Globe Control Valve, 72 BSSchuF supplies many in-line Control Valves featuring stuffing box orbellows seal, mostly with special materials or trim such as one with anoise reducing Control Valve Applications:Y-Globe Control Valve, 50 SRThe drawback of a globe Control valveis the low capacity and high pressureresistance.

6 The ball type Control valveshave a limited life due to the ball srotation wearing out the seal and needlarge actuators to overcome the hightorques. The y-globe valve s flowcharacteristics come close to those ofa ball valve, and allow the use ofsmaller Valves compared to a s proven metal to metal seatquarantees a longer leak tight sealingperformance than the ball valve withsmaller actuators. A typical applicationis temperature Control for a heatexchanger in a Drain ControlNormal flush mounted disc or ram bottomvalves can be customised and fitted withcontrol Control ValveAn angle valve with a class VI shutoff and acage with stepped Cv that offers goodcontrollability at both very low and highflowrates is used here as an emergency ventcontrol for Hydrogen. The class VI shut offis especially important for valuablecommodities like Feed Control ValveSchuF supplies Control Valves to Control the flow of dry powder feed carriedby gas even with high delta P.

7 This is an example of gas carried coal feedflow Control valve, designed for Shell, where Control of the flow is a criticaland complex task. The coal must not settle in the valve and so certainminimum speeds of flow must be maintained. At these speeds the coal isabrasive and so special materials such as an tungsten carbide must beused to produce the Recirculation ValveThese Valves protect the pump fromoverheating. When required they create aclosed loop for the pumps by feeding themin required flow back to the pump include sea-water on anFPSO, C4 in a refinery, oil in a cracker, PTAslurry and coal slurry in a liquefaction Type Control ValveThese Valves feature short as built lengths, yet theymaintain a high flexibility with an extremely widerange of Cv s. Their short lengths mean they canbe flanged between two pipeline flanges, evenwhen fully jacketed. The examples shown here areused in the production of nylon andpolycarbonates.

8 SchuF Engineered Control Valves Fetterolf +49 6198 571110; +1 843 881 3345; +353 21 4837000 SchuFSteam Conditioning Valve, 74 DUSteam Control Valves Control the pressure andtemperature of steam. Steam is generated at highpressures and temperatures to ensure high turbineefficiencies. The movement of the main stem regulatesthe pressure, the addition of water through the stemdesuperheats the steam. The further the valve opensthe greater the product throughput and the morecooling water is and related Applications:Waste Heat Recovery ValveThis valve is a full bore 3-way steam mixingvalve. Hot flue gas from the melting furnacesare used to turn water into steam by from these waste heat recovery boilersare transported and combined through a pipingnetwork to supply steam at high pressure,which is then passed through an existingturbine to generate electricity.

9 The 3-way valveserves as a mixing isolation valve in the mainsteam Up Valve for Steam GenerationAmong the uses for the energy inherent in the hightemperature flue gases from the furnaces of a Naphthacracker is the generation of steam. A normal Control valveregulates the usage of steam, once the system is atpressure. In order to get the system up to pressure a valvemust handle a small flow across the full pressure drop(over 120 bar). The standard Control valve cannot handlethe efficiently, so a parallel start-up valve is used until thesystem is up to operating Mixing Control ValveThis is an example of a gasoline mixing valve used in the oilrefining industry in hydrocracker Control . It controls the mixingof gasoline from a fluid catalytic cracking unit (which is thenpassed through a heat exchanger) with crude gasoline. Itusually has a linear Control Coking Lift Plug Switching Control ValveDelayed coking is a semi-continuous thermal cracking process.

10 After beingheated in a coke furnace the coke feed (a liquid-vapour combination) ispassed through a coke drum. Delayed cokers are designed as pairs sothat one can be cleaned with the other remaining in operation. A four wayswitching valve is required here to allow coke feed into whichever cokedrum is active. During start up, shut down or an emergency, the valve canalso bypass both drums, through the third outlet. The lift plug switchingvalve uses much less steam than a ball switching valve, shows no gapsbetween plug and body, minimises spare parts and maintenance timeand cost. It can be supplied as a complete unit with isolation Valves andcontrol panel. SchuF Engineered Control Valves Fetterolf +49 6198 571110; +1 843 881 3345; +353 21 4837000 SchuFMonomer & Polymer Control Valve Applications:Monomer Feed ValveDisc Control Valves are used to regulatethe level in PVC reactors.