Bailey Technical Catalogue - Safety Systems UK Ltd

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746 Safety Relief ValveDESIGNThe 746 Safety Relief Valve incorporates a freelypivoting disc, which ensures correct alignment withthe nozzle. The combination of top guiding,unobstructed seat bore and full lift capability ensuresthe highest possible discharge rate thus maximumplant protection.Due to the large flows available the inlet pipeworkmust be sized to give a maximum inlet pressure dropof 3%The 746 safety relief valve is available in bothconventional and balanced bellows types, and featuresa special disc style for liquid application, whichenhances valve performance.The ‘conventional’ arrangement is suitable forapplications where the built up pressure will notexceed 5%. The conventional valve can also be usedin systems where the superimposed backpressure is ata constant level (up to 80%).The ‘balanced bellows’ arrangement is for applicationswhere several safety relief valves discharge into acommon discharge manifold, or in any circumstanceswhere a variable back pressure can occur, up to amaximum of 40%.TECHNICAL SPECIFICATIONApprovalsBS6759 Pt 1, 2, & 3ASME VIIITUV-AD Merkblatt A2PED certified Category IVMaterialsBody - Carbon St. gr WCB (-29 to 427°C)- Stainless St. gr CF8M (-46 to 427°C)Trim - Stainless Steel (-46 to 427°C)- Viton (-29 to 200°C)- PTFE (-46 to 220°C)- EPDM - Hot Water (-29 to 150°C)Size RangeOrifice Min (Barg) Max (Barg)Size mm 2 Pressure* PressureDN25 (1") 415 0.35 40DN32 (1 1 ⁄4") 660 0.35 40DN40 (1 1 ⁄2") 1075 0.35 40DN50 (2") 1662 0.35 40DN65 (2 1 ⁄2") 2827 0.35 35DN80 (3") 4301 0.35 32DN100 (4") 6648 0.35 25* Minimum pressure for bellows valves is greater than statedPerformance (BS6759)Over BlowKdr pressure downSteam 0.7 5% 15%*Hot water‡ 0.7 5% 15%*Air / Gas 0.7 10% 10%*Liquid 0.46 10% 20%†*or 0.3 Barg min †or 0.6 Barg min ‡above 100°CPerformance (ASME)Over BlowKdr pressure downSteam 0.738 10% FixedAir / Gas 0.738 10% FixedLiquids 0.482 10% FixedMaximum Back PressureBarg 16Constant 80%Built-up 5%Variable 40% (when bellows fitted)(Total % must not exceed Barg shown)ConnectionsFlanged In x Flanged OutConstructionTop Guided / Full LiftCap OptionsPressure tight domePacked leverOpen leverSizingRefer to Capacity Charts (page 60-67)17
PARTSITEM PART MATERIALSCarbon SteelSt.St69181992731547731328121134332211DIMENSIONSFlanged x Flanged4121047238142621Lever versionsare available.1 Body Carbon St St.St2 Bonnet Carbon St. St.St3 Cap Carbon St. St.St4 Seat St.St St.St5* Disc# St.St St.St9 Guide Plate St.St St.St10 (H) Spindle St.St St.St11 Spring Plate St.St St.St12 Adjusting Screw St.St St.St13 Locknut St.St St.St18 (H) Body Stud Carbon St St.St19 Body Nut Carbon St St.St22 (H) Spring** C.V St.St23 (B)* Bellows Unit St.St St.St27* Body/Bonnet Gasket Garlock Garlock28* Cap Gasket Garlock Garlock31* Ball St.St St.St33 Nameplate St.St St.St34 Nameplate Pin Carbon St St.St41 Warranty Seal Lead/wire Lead/wire42 Drain Plug Carbon St St.St47(BH) Spacing Piece St.St St.St62 Seat Pin St.St St.St69 Split Collar St.St St.St77 Adjusting Screw Bush PTFE PTFE81(B) Lift Stop St.St St.StNote:B - Denotes used on Bellows type valves.H - High Pressure type valves; spacer, larger studs, spring andspindle.# Resilient trims are available.* Recommended spares; available from Safety Systems UK Ltd.** Other spring material options are available dependent on duty.Recommended inspection every 12 months.FIGURE NUMBERINGC746 /FlangedADValve Valve Inlet Outlet ‘C’ ‘C’ ‘C’ WeightType Size A Dome Lever Bellows D (kg)DN25 1" 1 1 ⁄2" 105 410 410 445 100 8.5DN32 1 1 ⁄4" 2" 115 455 455 490 110 14.0DN40 1 1 ⁄2" 2 1 ⁄2" 140 570 570 605 115 20.0DN50 2" 3" 150 615 615 665 120 30.0DN65 2 1 ⁄2" 4" 170 725 725 785 140 42.5DN80 3" 5" 195 825/ 825/ 865/ 160 64.5925H 925H 965H925/ 925/ 955/DN100 4" 6" 220 1030 1030 1060 180 86.0H HFlange sizes listed are for:Carbon Steel Flanges PN 40x16Others available on request.All dimensions in mmTYPE1. Conventional2. Bellows3. Liquid Conventional4. Liquid BellowsSIZE1. 25 x 40mm2. 32 x 50mm3. 40 x 65mm4. 50 x 80mm5. 65 x 100mm6. 80 x 125mm7. 100 x 150mmCONNECTIONS1. PN 16 RF x PN 16 RF2. PN 40 RF x PN 16 RF5. ANSI 150 RF x 150 RF6. ANSI 300 RF x 150 RFNotes:A. Any special requirements will beindicated by the letter X which will beagreed with the sales office. For example,paint specification or spring material.B. Any combination of features can be calledup eg. DG, PR, DFRN etc.C. (H) for ‘746’ 80 and 100mm valves only.BODY MATERIAL2. Carbon Steel3. Stainless SteelFEATURESD. Domed CapF. FerruleG. GagM. Open LeverN. NACE MaterialsP. Packed LeverR. Resilient SeatH. High Pressure (H)X. Special Details18
Page 1: Pressure & Flame ProtectionSafety &
Page 4 and 5: The logical choiceWherever demandin
Page 6 and 7: Safety Relief ValvesINTRODUCTIONThe
Page 9 and 10: INSTALLATIONSafety Relief Valves sh
Page 17: SIZINGTemperature Rating in kWSize
Page 21 and 22: PARTSITEM PART MATERIALCarbon Steel
Page 23 and 24: PARTSITEM PART MATERIALThere are tw
Page 25 and 26: PARTS1418121611101978613317152ITEM
Page 27 and 28: PARTSITEM PARTMATERIAL480 490119105
Page 29 and 30: PARTSITEM PART MATERIAL211692028173
Page 31 and 32: G4 SeriesPILOT OPERATED PRESSURE RE
Page 33 and 34: LOW PRESSURE TOPGAS AND OXYGEN DUTI
Page 35 and 36: MATERIALSITEM 2042 & 2043 2044 2045
Page 37 and 38: DIMENSIONSCONNECTION OPTIONSBCScrew
Page 39 and 40: INSTALLATIONTYPICAL STEAM REDUCING
Page 41 and 42: SIZINGThe G4 Pressure Regulator can
Page 43 and 44: SURPLUS/MAINTAINING VALVESThe ‘G4
Page 45 and 46: TECHNICAL SPECIFICATION - G4 SURPLU
Page 47 and 48: PARTSITEM PARTMATERIALA191220111098
Page 49 and 50: Vent holeCXAAIN OUTBDDIMENSIONSScre
Page 51 and 52: PARTSITEM PARTMATERIAL1 Adjusting S
Page 53 and 54: PARTSITEM PARTMATERIAL121* Piston S
Page 55 and 56: 170mm(194mm with SPO)460mm(483mm wi
Page 57 and 58: RISE AT DEAD ENDDEAD END SETTINGThi
Page 59 and 60: SIGHT GLASSThe Bailey 1001S Sight G
Page 61 and 62: AIR CAPACITY CHART (l/s) @ 0.3 Barg
Page 63 and 64: SATURATED STEAM CAPACITY CHART (kg/
Page 65 and 66: WATER CAPACITY CHART (l/min) @ 10%
Page 67 and 68: HOT WATER CAPACITY CHART (kW) FOR A
Page 69 and 70:
G4 DRY SATURATED STEAM CAPACITY - K
Page 71 and 72:
G4 PIPE SIZINGCAPACITIES FOR STEAM
Page 73 and 74:
AIR CAPACITIESInletPressure(Barg)Ou
Page 75 and 76:
WATER CAPACITIESPressureDifferentia
Page 77 and 78:
SATURATED STEAM CAPACITIESInletPres
Page 79 and 80:
SpringSelectionCharts78
Page 81 and 82:
716 SPRING SELECTIONDN15 Spring Ran
Page 83:
Safety Systems UK Ltd.Sharp Street,
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Bailey Technical Catalogue - Safety Systems UK Ltd

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