Bailey Technical Catalogue - Safety Systems UK Ltd

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766 Safety Relief ValveDESIGNThe 766 Safety Valve is a double spring high lift valvewith high discharge capacity. The top guided pistondesign incorporates an adjustable blowdown ring andmeets all the requirements of BS6759 Part 1.A freely pivoting disc and precision lapped stainlesssteel trim gives positive re-seating for steam duty.Fitted as standard with test lever for inline testing.Ideally suited to applications on steam boilers andpipelines where blowdown tolerances are critical.TECHNICAL SPECIFICATIONApprovalsBS6759 Pt 1PED certified Category IVMaterialsBody - Carbon St. gr WCB (-29 to 230°C)Trim - Stainless Steel (-29 to 230°C)Size RangeOrifice Min (Barg) Max (Barg)Size mm 2 Pressure PressureDN40 (1 1 ⁄2") 2280 0.35 24DN50 (2") 4054 0.35 24DN65 (2 1 ⁄2") 6334 0.35 24DN80 (3") 9121 0.35 24PerformanceOver BlowKdr pressure downSteam 0.4 10% 10%**or 0.3 Barg minMaximum Back PressureBarg CS 12 / CI 6Constant 0%Built-up 50%Variable 0%(Total % must not exceed Barg shown)ConnectionsFlanged In x Flanged OutConstructionTop Guided / High LiftCap OptionsOpen lever fitted as standardSizingRefer to Capacity Charts (page 60-67)FIGURE NUMBERING766TYPE1. ConventionalVALVE SIZE*†3. 40mm (2 1 ⁄2" x 3")4. 50mm (3" x 4")5. 65mm (4" x 5")6. 80mm (4" x 6")CONNECTIONS1. 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 RFFEATURESG. GagM. Open LeverBODY MATERIAL2. Carbon Steel21*Flange sizes are larger than the valve size, refer to the dimension tableNotes:A. Any special requirements will be indicated by the letter X which will be agreedwith the sales office. For example, paint specification or spring material.B. Any combination of features can be called up eg. MG etc.C. Flange options are dependant on Valve Body materials, as detailed opposite.† Please see table on page 22 for inlet and outlet connection sizes.
PARTSITEM PART MATERIALThere are twovent holes toensure springchamber is atatmosphericpressure.22253016181514171312271121610 320498511 Body Carbon Steel2 Cover Carbon Steel3 Valve Disc Holder Bronze4* Valve Disc St.St.5 Seat Ring St.St.6 Guide Bronze7 Spindle St.St8 Blow Down Ring St.St9 Setting Screw St.St10* Valve Disc Ball St.St11* Spindle Ball St.St12* Spring Chrome Vanadium13 Easing Lever SG Iron14 Dome Bronze15 Dome Cap Carbon Steel16 Adjusting Screw Brass17 Locknut Brass18 Spring plate Plated Steel20* Disc Retaining Clip St.St21* Body Gasket Garlock22 Locking Pin Brass23 Seat Securing Pin St.St25 Padlock Brass26 Body Stud Steel27 Body Stud Nut Steel28 Nameplate St.St29 Nameplate screw Steel30 Locknut SteelNote:* Recommended spares; available from Safety Systems UK Ltd.Recommended inspection every 12 months.282926DIMENSIONS27Flanged x Flanged23Valve Valve Inlet† Outlet† A B C D E F (BSP) K WeightType Size CS CS CS DRAIN CS (kg)FlangedDN40 2 1 ⁄2" 3" 197 22 452 156 185 3⁄8" 200 25DN50 3" 4" 229 24 498 181 200 1⁄2" 220 38DN65 4" 5" 279 24 660 219 235 1⁄2" 250 58DN80 4" 6" 295 24 702 238 235 1⁄2" 285 83Flange sizes listed are for:Carbon Steel Flanges PN 40x16Others available on request.All dimensions in mm.22
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 and 18: SIZINGTemperature Rating in kWSize
Page 19 and 20: PARTSITEM PART MATERIALSCarbon Stee
Page 21: PARTSITEM PART MATERIALCarbon Steel
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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