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Bulletin 71.1:CSB400

TYPE CSB403 TRUE-MONITOR BACKUP ORIFICE DEVICE

Damage/nick on seat X X

Damage to disk X X

Damage or disconnected lever X - - - -

Damage to diaphragm X - - - -

Blocked or broken registration to primary regulator X - - - -

1. AstheIntegralMonitorisexternallyregistered,itisrequiredthatthePrimaryandIntegralWide-OpenMonitordonotsharedownstreamsenselines.

Table 6. True-Monitor Protection vs. Backup Orice Device

Integral True-Monitor™ Protection

TypesCSB403andCSB423combinetheoperationof

aconventionaltwo-regulatorwide-openmonitorsetinto

onebody.TheIntegralTrue-Monitorinstalledontheinlet

sideofthebodyandservestothrottleowandmaintain

anacceptabledownstreampressureinthecasewhere

thePrimaryregulatorceasestocontrolthedownstream

pressure.Unlikemultipleseatdesignsthatrelyonthe

primaryregulatorforallfailuremodes,theTypeCSB403

providesprotectionfromawidevarietyofoccurrences

thatcouldcausethePrimaryregulatornottoregulate

downstreampressure.Table 6 showsacomparison

betweentheIntegralTrue-Monitorprotectionandthe

protectionofferedbyanoricebackupdevice.

RefertoFigure5.IfthePrimaryregulatorceasesto

controldownstreampressure,outletpressurewillrise

underneaththediaphragmoftheIntegralmonitor,which

willassumecontrolofthedownstreampressure.

Table6showsacomparisonbetweentheIntegral

True-Monitorprotectionandtheprotectionofferedby

Figure 5. Type CSB403IT Internally Registered Primary Regulator with Externally Registered Integral Monitor Operational Schematic

Type CSB403IT Regulator with Token Relief and Monitor

MXXXX

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

May 2008

Type CSB403

TANK PRESSURE

VACUUM PRESSURE

PRE-EXPANSION PRESSURE

INTERMEDIATE BLEED PRESSURE

PILOT SUPPLY PRESSURE

INTERMEDIATE PRESSURE

LOADING PRESSURE

PUMP PRESSURE

BYPASS PRESSURE

BACK PRESSURE

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

VACUUM PRESSURE

PRE-EXPANSION PRESSURE

INTERMEDIATE BLEED PRESSURE

PILOT SUPPLY PRESSURE

INTERMEDIATE PRESSURE

PILOT SUPPLY PRESSURE

VACUUM PRESSURE

TANK PRESSURE

VAPOR PRESSURE

LOADING PRESSURE

BYPASS PRESSURE

BACK PRESSURE

PUMP PRESSURE

BOOST PRESSURE

EXHAUST

PILOT LOADING PRESSURE

VENT HEADER PRESSURE

INLET BLEED PRESSURE

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

M1098

EXTERNAL CONTROL

LINE (SENSE LINE)

PRESSURE RETAINING

PLUG (DO NOT

REMOVE WHILE UNIT

IS PRESSURIZED)

MONITOR ADJUSTING SCREW

REGULATOR ORIFICE

REGULATOR

ADJUSTING SCREW

REGULATOR

CONTROL SPRING

MONITOR CONTROL SPRING

MONITOR DISK

MONITOR

LEVER

MONITOR

VALVE STEM

MONITOR

OPENING SPRING

BALANCED PORT

ASSEMBLY

REGULATOR

VALVE STEM

REGULATOR

LEVER

REGULATOR

PUSHER POST

WIDE-OPEN INTEGRAL MONITOR REGULATOR PRIMARY REGULATOR

TOKEN RELIEF

SPRING

MONITOR ORIFICE

downstreamsystemviaaslam-shutthatactivatesif

thedownstreamsystempressurerisesaboveorfalls

belowthesetpointoftheslam-shut.

Upstream Monitoring Regulator

TypesCSB410,CSB414,CSB430andCSB434

actasseparateupstreammonitoringregulators.

Theseupstreammonitorregulatorsactinthesame

mannerasaTypeCSB400withexternalpressure

registrationonly,theyareinstalledupstreamofa

primaryregulator.IfthedownstreamPrimaryregulator

ceasestocontrolthedownstreamsystempressure

anddownstreampressurebeginstoincrease,this

pressure increase is registered underneath the

diaphragmoftheUpstreamMonitorregulatorthrough

thedownstreamcontrolline.Theincreasedpressure

willovercometheforceforthecontrolspringand

causethediaphragmassemblytomoveupward,

therebymovingtheleverupwardandmovingthedisk

closertotheoricetoregulateowanddownstream

systempressure.

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