Vacuum breakers for steam systems - Spirax Sarco

1 Vacuum breakersfor steam systems2 Vacuum breakersprotecting equipment from Vacuum damageThe Spirax Sarco Vacuum breaker range will protect your plant and process equipmentagainst Vacuum , and at the same time allow condensate to draineffectively from pipework and storage choice of eitherstainless steel orbrass body and capAir connectionPrecision groundstainless steel valveSystem connectionHexagonal body forease of installationStainless steel gasketLow differentialpressure required toopen the valveThe precision groundstainless steel valve isheld firmly on its seatduring normal operatingconditions ensuring a cooling, steambegins to condenseresulting in a reductionof pressure.

2 The valveremains on its upper seatuntil the pressure in theupper chamber falls belowthe air inlet pressure(usually atmosphericpressure).At the point of Vacuum ,the valve will instantly liftof its seat. The air is thendrawn in throught theupper chamber preventinga Vacuum being a Vacuum breaker worksSteam connectionAir inletAir inNormal operationCoolingAt point of vacuum3 User benefitslProtects valuable equipment from effective drainage from the , reliable and robust Sarco 's guarantee of worldwide technicalsupport, knowledge and robust reliable products have been used onnumerous system applications preventing vacuums inequipment such as.

3 Heat exchangersStorage vesselsBoilersJacketed pansSterilizing chambersSteam mainsTypical applicationsVacuum breakerAirBoiler panVacuum breakerAirSteam mainsOur range of Vacuum breakers will ensure troublefree operation whatever your and pipeconnectionsSystem connection " screwed BSP or NPTAir connection18" screwed BSP or NPTBodyBrassCu Zn 39 Pb 2 CapBrassCu Zn 39 Pb 2 GasketStainless steelBS 1449 304 ValveStainless steelZ100 CD 17 Valve seatStainless steelZ15 CN 16 02VB14VB21 BrassAustenitic stainless steelMaterialsSystem connection " screwed BSP or NPTAir connection18" screwed BSP or NPTA ustenitic stainless steelAISI 303 Austenitic stainless steelAISI 303 Stainless steelBS 1449 304 Stainless steelAISI 440 CST Issue 3SB-P019-01 VBVB14screwed brassOperating rangeLimiting conditionsBody design conditions PN16 Maximum allowable pressure 16 bar gMaximum allowable temperature 260 CCold hydraulic test pressure 24 bar gBody design conditions PN25 Maximum allowable pressure 25 bar gMaximum allowable temperature 400 CCold hydraulic test pressure 38 bar g*PMO - Maximum operating

4 Pressure recommended when used for saturated product must not be used in the red *16 Pressure bar gTemperature CSteamsaturationcurve0100200300400051015 20 21*25 Pressure bar gTemperature CSteam saturationcurveVB21screwed 30 40 50100200300 400 500 Capacities VB14 and VB21 Dimensions (approximate) in mmDp (mm Hg)Flow m /sDp required to open Vacuum breakers - mm HgVB14 VB21A (A/F) (kg) Limited, Charlton House,Cheltenham, Gloucestershire, GL53 8ER : +44 (0)1242 521361 Fax: +44 (0)1242 573342E-mail: Copyright 2000 Spirax Sarco is a registered trademark of Spirax - Sarco Limit