Vacuum Breaker VB14,VB21 - Spirax Sarco

1 PipelineAuxiliariesVacuum BreakerVB14, vb21 The VB14 andVB21 are designedto admit air to con-densing vapor(steam) or liquidsystems wherevacuum formationmay inhibit systemdrainage or the interests of development and improvement of the product, we reserve the right to change the VB14VB21 Sizes1/2" x 1/8" ConnectionsNPT ConstructionBrass BodyStainless Steel BodyStainless Steel Valve OptionsBSP Material1 CapVB14 BrassCU ZN 39 PB2VB21 Stainless SteelType 3032 Valve Check BallVB14 Stainless SteelZ 100 CD 17VB21 Stainless SteelType 440C3 Valve SeatVB14 Stainless SteelZ10 CN 18 08VB21 Stainless SteelType 3034 BodyVB14 BrassCU ZN 39 PB2VB21 Stainless SteelType 3035 GasketVB14 Nickel Reinforced Exfoliated GraphiteVB21 Stainless SteelType 304 Construction MaterialsLocal regulation may restrict the use of this product below the conditions quoted.

2 Limiting conditions refer to standard connections ApplicationsUsed on steam inlet to air coils, heat exchangers,sparge systems, jacketed kettles, boiler feedwater tanks, chilled water lines and liquid processlines, all of which at one time or another generatevacuum conditions which must be releived toallow proper system Operating ConditionsMax. Operating Pressure (PMO)VB14: 210 psig (14 barg) vb21 : 304 psig (21 barg)Max. Operating TemperatureVB14: 500 F (260 C) vb21 : 752 F (400 C) Pressure Shell Design ConditionsPMAVB14:232 psig/0-500 F16 barg/0-260 CMax. allowable pressureVB21:304 psig/0-752 F21 barg/0-400 CTMAVB14:500 F/0-232 psig260 C/0-14 bargMax. allowable temperatureVB21:752 F/0-304 psig400 C/0-21 bargTI-4-103-US CharacteristicsMaximum Cv required to open 2 in H2O ( in Hg)7654321024681012 AIR HANDLING CAPACITIESin Hg VACUUMSCFM AIRP ipelineAuxiliariesVacuum BreakerVB14, vb21 MaintenanceAfter the Vacuum Breaker is isolated from systempressure, the cap can be unthreaded to examine thevalve and valve seat areas for debris which canbecome trapped and cause breakage of system pres-sure during normal operation.

3 The Vacuum Breaker isnot install in a vertical position with cap at thetop. Generally the device should be mounted on thehighest point of the circuit. Large coils or equipmentmay require more than one Vacuum Breaker to befitted. An isolating valve should be fitted to Sarco , Inc., 1150 Northpoint Blvd, Blythewood, SC 29016 Telephone: (803) 714-2000 FAX (803) 714-2222TI-4-103-US SpecificationVacuum Breakers shall be used on all modulating oron/off heat exchangers and coils, except in vacuumreturn systems. They shall be installed in the supplyside between the control valve and equipment and beof hardened ball check valve design with all workingparts manufactured from stainless steel. Bodies shallbe made from either brass or stainless steel depend-ing on the application, and shall be suitable for oper-ating conditions of 210 psig (or 304 psig) (nominal) in inches and millimetersSizeABCW eight1/2" kg1/2" kg Spirax Sarco , Inc.

4 2005