data sheet - COMEVAL

comeval.es

data sheet - COMEVAL

OPTION–33(cont.):OPTION–56:nec tion. May be used with Opt-30and -32. Third connection is at samepres sure level as inlet and is in-linewith inlet connection, allowing in-line,fl ow-thru in stal la tion.SPECIAL CLEANED. Cleaned perCashco Spec. #S-1542. Utilize whenbetter than normal clean li ness level isOPTION–95:required and unit is not for oxygenservice.EPOXY PAINTED. Two-step epoxycoated for severe ambient conditionsto minimize external corrosion. Appliedto all exposed parts except thoseof SST. Pro ce dures and specs perCashco Spec. #1547.STEP 1:APPLICATION AND SE LEC TIONThe following procedure will help determine a suitable selection for an application.FIVE KNOWNS. The following minimal parameters / information must beavailable before a se lec tion pro ce durecan begin:This deviation in setpoint is de scribedas “% build”. Build is expressed onincreasing fl ow, starting from a minimum fl ow level.STEP 2:STEP 3:a. Service Flu id - What is it? Liquidor gas? SG (std. cond.)b. Inlet Pres sure - P 1(up streampres sure). How much can P 1vary as fl ow var ies?c. Outlet Pres sure - P 2(down streampressure).d. Desired ca pac i ty - Cv, GPM,SCFH; min i mum & max i mum.e. Fluid tem per a ture - T 1, SG (actual).INLET PRESSURE. Assure thatthe actual design inlet pressure andtem per a ture limits do not exceed thelim its established in Table 2. Bothbody and spring chamber must comply.Consider level of pressure buildto be added (Step 4. below).PRESSURE DROP. Check the maximum pressure drop (P 1- P 2) againstlimits established in Table 3 to as surenot exceeding.STEP 5:The “% build” or stated maximum allowablebuild must be known to enterthe capacity tables. The ac cept ablelevel of setpoint de vi a tion should beknown for the min - to - max fl owvariation.A regulator may have a setpoint10% below the lower stated rangespring level. (Tags will show thestandard ranges.) A setpoint abovethe higher range spring level is notrec om mend ed. Setpoint at the upperlimit of a range spring is acceptable.If fi nal setpoint is ques tion able andex pect ed near the upper limit, thenext higher range spring shouldbe uti lized. Best performance willbe ob tained when the lowest rangespring is utilized.GASKET MATERIAL: Consideringthe fl uid, determine the compatibilityof the gasket material.STEP 4:PRESSURE BUILD. Once setpoint isreached and regulator opens, all selfcontainedback pressure / relief regulators“build” from a setpoint pres surelevel as the fl ow rate increases.STEP 6:CAPACITY. The five knowns of Step 1allow computing the re quired ca pac i tyfactor, Cv. (Specific Gravity tables arerequired.) With P 1,P 2, % build, andrequired Cv factor, enter the Capacity- Cv Table 5, and con firm performancecapability of the Model 6987. NOTE:Care must be exhibited to utilize theproper section of Table 5 when Opt-12+15 is se lect ed.STEP 7:TRIM MATERIAL. Minute leakageshould be expected with metalseat ed designs.6987-TB 3


TECHNICAL SPECIFICATIONSTABLE 1APPLICATIONSFluid Recommended Construction Trim Designation NumberAir, Inert or Industrial Gases,Hydrocarbons, Chemicals,Water and CondensateMetal Seat and Diaphragm S1TABLE 2DESIGN PRESSURE –TEMPERATUREMATERIAL SPECIFICATIONSMaterial SpecificationsPressureTemperature(Body / Spring Chamber)Description (Abbr.) ASTM No. psig (Barg) °F (°C)CS/CSSST/CSA216 Gr.WCBA351 Gr.CF8M/A216 Gr.WCB1500 (103.4) -20 to +450 (-29 to +232)TABLE 3MAXIMUM ALLOWABLE PRESSURE DROPSFluidLiquidGas1Non-cavitating.Maximum Recommended Operating Pressure DropClean FluidIndustrial QualityUnclean FluidPipeline QualitySeat Designpsid (Bard) psid (Bard)Standard600 (41.4) 400 (27.6)960 1 (49.7) 600 1 (41.4) 1 Opt-12+15 Stellited960 (66.2) 600 (41.3) Standard960 (66.2) 960 (66.2) Opt-12+15 StellitedTrim DesignationNumberS14 6987-TB


TrimDesignation No.TABLE 4TRIM MATERIALDiaphragm 1 Cylinder Piston O-ringSpringButtonPistonSpringTemperature°F (°C)S1 302 SST 316 SST 316 SST TFE 316 SST 302 SST -20 to +450 (-29 to +232)1A stellite #6 insert is press fi t into the cylinder when an Opt-12+15 is specifi ed.SetPressureTABLE 5Capacity - C vF L= 0.95Stellited Seats &Full Orifice Reduced OrificeOpt-12+15% Build % Buildpsig (Barg) 10% 20% 10% 20%50 (3.4) .42 .78 .25 .4675 (5.2) .50 .95 .31 .57100 (6.9) .65 1.20 .35 .69150 (10.3) .68 1.30 .40 .73250 (17.2) .82 1.52 .17 .37350 (24.1) .35 .66 .21 .35450 (31.0) .40 .75 .23 .43550 (38.0) .47 .85 .25 .45650 (44.8) .48 .88 .26 .46800 (55.2) .50 1.00 .30 .576987-TB 5


1/4" - 18 NPT(w/Opt-1)Shown withOpt-33 Third ConnectionDIMENSIONS AND WEIGHTSENGLISH UNITS (Inches & lbs)Body Size A 2 B B C 2 D E F GShippingWeight1/2" & 3/4" 1.82 9.44 10.00 2.00 5.50 5.25 5.25 5.59 34 lbsMETRIC UNITS (mm & kg)Body Size A 2 B B C 2 D E F GShippingWeightDN 15 & DN 20 46 240 254 51 140 133 133 142 15.4 kgs.1Applies to Model 6987 -30+33 or Model 6987-32+33.2Applies to NPT (screwed) bodies.NOTE: Dimensions "E" and "F" apply to Opt-30 Flanged end connections or Opt-32 Plain End Pipe Nipples.6 6987-TB


NOTES6987-TB 7


PRODUCT CODE 06-24-04TABLE 1 - GASKETSGaskets/Service Options CODEStandard: Non-Asbestos/ — BNon-OxygenTABLE 4 - END CONNECTIONS2-End Conn.DescriptionCODE3-End Conn.(Opt-33)CODENPT Screwed 1 4Opt-30 - 300 LB RF Flanges * 7 DOpt-30 - 600 LB RF Flanges * 8 HOpt-32 - SCH 80 PE EXT Nipples * E FTABLE 2 - SIZESize CODE1/2" (DN15) 43/4" (DN20) 5TABLE 3 - BODY & SP.CHAMBER MATERIAL*Nipples & Flanges same material as body.TABLE 5 - RANGE SPRINGRangeCODEpsig (Barg)50 - 100 (3.4 - 6.9) 175 - 200 (5.2 - 13.8) 2Body/Spring ChamberCODE150 - 300 (10.3 - 20.7) 3CS/CS 5SST/CS 9200 - 450 (13.8 - 31.0) A400 - 600 (27.6 - 41.4) B500 - 800 (34.5 - 55.2) CTrimDesignationNo.J B S 1 7AModel 6987 Back PressureRelief RegulatorTABLE 6 - OPTIONSDescription Option CODESpecial Construction — XClosing Cap -1 1Reduced & Stellited Seat Surfaces(S1 Trim Only)-12+15 ASpecial Cleaning: Per Cashco Spec#S-1542. Not suitable for OxygenService-56 NEpoxy Painted -95 WASSIGNMENT OF “OPTION” CODES1. When ordering a valve per one of Cashco's special drawings, the code“X” and the 5-digit number following override all other options.Otherwise, proceed with the following.2. NUMERIC digits assigned fi rst in “ascending” order.3. ALPHA designations are assigned second (excluding the “X”) in“alphabetical” order.4. Left justify.5. Add “0” to all unused squares.6. If insuffi cient quantity of squares, consult factory for proper code.Cashco, Inc.P.O. Box 6Ellsworth, KS 67439-0006PH (785) 472-4461Fax (785) 472-3539E-mail: sales@cashco.comexportsales@cashco.comPrinted in U.S.A. 6987-TB

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