Masoneilan - mecca.com.pk

1 MasoneilanLo-db high PressureControl ValvesBulletin BP5500E(Formerly Bulletin 373E)Bulletin BP5500E(Formerly Bulletin 373E)MasoneilanThe 77000 Series Lo-db valve* is designed to reduce fluidvelocities and the resultant noise generation to tolerablelevels, while diminishing metal fatigue and erosion due tohigh fluid velocities and vibration, at low initial Costs MinimizedThe size of the outlet flange is purposely enlarged to reduceoutlet velocity and to eliminate the need for pipe reducersbetween the valve and the larger downstream piping. Theoutlet flange connection is available in lower ratings (seespecifications). Additional cost savings are found in theomission of expensive OperationThe multiple step, labyrinth type plug and seat ring incorpo-rate a Stellite-faced seating surface (3) at the top to providetight shut-off.

2 The rest of the steps do not touch. The inter-meshing flow pattern between the steps results in a largenumber of sharp turns for the fluid. This develops a highvelocity head loss ( pressure drop) and therefore areduced velocity. The shape of the plug steps is designedto prevent the deposit and trapping of solids entrained in thefluid stream. Low velocity also ensures longer trim life dueto less Cost Operation and MaintenanceThe relatively short stroke of the Lo-db valve keeps instal-lation and operation costs low by permitting use of standard,pneumatic spring-diaphragm actuators. These atcuators,used with a ratio lever, provide sufficient force to close thevalve at pressure drops up to 6000 psi with the spring to integral bonnets, the deep packing box is the onlyhigh pressure seal in the valve.

3 The oversize stem and plug(1) are welded together to form a sturdy, vibration-proofsubassembly having a high natural frequency. The plugand stem are guided top and bottom for additional removable seat ring (5) is clamped against a shoulderin the valve body by the lower flange. Since the shoulder(6) is near the bottom flange , the long seat ring is free toexpand and contract with changes in fluid between the seat ring and body is prevented witha high pressure O-ring seal (2) for near ambient tempera-ture fluids and the lapped shoulder (6) for high temperatureapplications. Raised lips (7) are machined on the seat ringand body for a possible seal , Stable control ; Fail Safe ActionThe high rangeability (100:1) of the Lo-db valve allows widevariations in controlled flow.

4 Operation is stable becausethe low static unbalanced is achieved by supporting theplug on the lower guide (8), which acts as a piston. Byadmitting a selected intermediate pressure through internalplug porting (4), a balance force exists within the plug whichreduces the unbalance force to a minimum. The valve willfail in the proper direction by the actuator spring on air EquipmentA variety of optional pneumatic and electropneumatic posi-tioners, solenoid valves, limit and position switches andhandwheels are available to suit each process application.* Patent No. 3,485,474 and other foreign 77000 Series Lo-db control valvecuts noise to acceptable limits;provides long-term, maintenance-free serviceValve shown wide openspecificationsgeneral dataflowcharacteristic:linearrangeabilit y:100:1flow direction:side inlet connection - bottom outletmiximum fluidtemperature:to 775F (carbon steel)to 1050F (stainless steel or chrome-moly)seat of max.

5 Cvat 50 psi air drop toatmoshpere (ANSI , Class IV)bodytype:cast with integral bonnet and bolted outlet flangestandard sizes:2 x 3 , 2 x 4 , 3 x 4 , 3 x 6 , 4 x 6 , 4 x 8 , 6 x 8 materials:carbon steel (ASTM, A216 Gr. WCB)stainless steel (ASTM, A351 Gr. CF8M)chrome-moly steel (various gradesavailable)connections:flanged or butt weldedbody rating:ANSI Class 2500 Flange Ratings Not available with C ring and plugtype:expanding labyrinthmaterials:AISI 316 stainless steel with Stellitedseating surfacesplug stem17-4 PH stainles steel (to 800F)AISI 316 stainless steel with Stellitedguiding surfaces (to 1050F) pressure Drop Limitation(spring-diaphragm actuator)Supply pressure : 35 psig for all sizes except 50 psig required with 6 bushingsAISI 440C hardened (to 800F)AISI 316 stainless steel with Stellite(above 800F)packing (lubricated)Teflon asbestos (to 400F)Grafoil (400F to 1050F)seat ring gasketBuna-N O-ring (to 180F)Lapped metal seal andAsbestos-filled stainless steel gasketstudsSteel ASTM A193 (to 850F)ASTM A320 (to 1050F)leverCadmium plated steelFlow Coefficients- rated Cv* Use in conjunction with Cyfactor.

6 See Masoneilan Noise control Manual** Use standard valve SPL prediction method with Cf = NumbersValve InletOutletSizeMaximum(in.)SizeRatingSiz eRating(nominal) (in.)ANSI Class(in.)ANSI Class221500 & 2500325004 900331500 & 2500425006 600441500 & 2500615008 600661500 & 250082500 ValveTrim A Trim BTrim C**Size (for lowest noise values)(single step)(in.)AreaCv*AreaCv* Plugwith Spring-DiaphragmActuatorDescriptionair-t o-openair-to-closeSize AReduced Area37-77773-A38-77773-ASize BFull Area37-77773-B38-77773-BSize CHigh Capacity37-77773-C38-77773-CSingle Step21 1511-3050003453-15500034532 18L12-3040002753-15600041543 249-3030002053-15500034563 2419-4640002753-154000275 Air-to-Open ActionAir-to-Close ActionValveStrokeActuatorSpringAllowable pressure DropSpringAllowable pressure DropSize(in.)

7 SizeRangeRange (psi)psibar(psi)psibardimensionsinchesmi llimeters2318 8 9 14 13 22 1117 34 43422 11 11 16 173319 20 44 64628 15 14 21 18 33 18 2747 86837 201625 2241 17 2757508046021524136535256528044588010080 1005703002924104308384855261120150100150 7303953685404758514786861210200150200954 50840664156010504506861450 ValveValveCInletOutletDEFGLMNABTrim A & BTrim CAbove: horizontally installed Lo-db valve handling up to 7,500,000 scfhgas in a process : 6 x 8 Lo-db valve for 220 lb/hr superheated steam in turbinebypass : four of 17 Size 3 x 6 Lo-db valves employed for 5000 psi nat-ural gas pressure DivisionMcGraw-Edison Company63 Nahatan StreetNorwood, Massachusetts D/PPrinted in