Bailey Technical Catalogue - Safety Systems UK Ltd

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Class TH Pressure Reducing ValveThe Class TH High Pressure Reducing Valve has beendeveloped to increase the outlet pressures availablefrom the Class T range of valves.The existing range utilises diaphragm technology toregulate the closing pressure. This technology relieson the flexibility of rolling rubber diaphragms, whichlimit the maximum outlet pressure due to the strengthof the rubber.Within the Class TH High Pressure Reducing Valve,the diaphragm is replaced with a piston (Y). The outletpressure is sensed up through port (X) to theunderside of the piston. This design allows muchhigher pressures to be accommodated and is lesssusceptible to pressure spikes and water hammer.OPERATIONThe Class TH pressure regulator is operated by aspring loaded piston and has a balanced main valvewhich ensures that the outlet dead-end pressure isunaffected by changes of inlet pressure.The valve is opened by the load on the adjustingspring and closed by reduced pressure on theunderside of the piston. Under normal workingconditions, the balance of these two forces gives thedegree of valve opening for the required reducedpressure.FEATURES AND BENEFITS• Fully balanced piston - allows a constant outletpressure to be maintained, irrespective of varyinginlet pressure.• Soft disc - for positive shut-off.• Self actuation/regulation - requires no externalpower source.• Simple design - enables the valve to be easilymaintained and serviced without removal from theline.• Minimum variation between ‘flow’ and ‘no-flow’pressure.TECHNICAL SPECIFICATIONSizeConnectionMaterial25, 40 and 50 mm(1, 1 1 ⁄2 and 2 inch)Flanged BS4504 PN16/40.BronzeTemperature Range -20 to 100°CMaximum Inlet PressureMaximum Outlet Pressure*Minimum Outlet Pressure*40 Barg20 Barg3 Barg* Setting including rise at dead end (see pages 56 and 74).CE MARKINGThe Class TH has been certified to the requirementsof the PED (Category II). Valve sizes below 32mm(1 1 ⁄4 inch), do not require, and hence, cannot be CEmarked.SPRING SELECTIONDead End Spring Number SpringsSetting DN25 DN40 DN50 ColourBarg (1") (1.5") (2") Code3 to 15 C2957-425 C2954-425 C2960-425 White1 to 7 – C3197-425 C3196-425 Purple>7 to 20 C3019-425 C2959-425 C2961-425 YellowDead End Setting = Flowing outlet pressure + Rise to dead end47
Vent holeCXAAIN OUTBDDIMENSIONSScrewedSIZE DN25 DN40 DN50A BSPF 1" 1 1 ⁄2" 2"B 56 68 79C 222 292 324D 111 133 165Kg 4 8 11FlangedSIZE DN25 DN40 DN50A 1" 1 1 ⁄2" 2"B 61 70 83C 222 292 324D 160 200 230Kg 6.5 13 17All dimensions in mm.48
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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 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: PARTSITEM PARTMATERIALA191220111098
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,

Bailey Technical Catalogue - Safety Systems UK Ltd

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