Hattersley Constant Flow Regulator02
Installation and Operating Instructions
Installation
These instructions are issued as guidelines only and do not cover all installed conditions. If unsure
pleasecontactourTechnicalHelplineon01473277400,beforeinstallation.
• It is advised that the valve should be installed in a run of pipe of the same nominal size.
• Hattersley products are designed for installation and use within suitably designed systems
reflectingCIBSE,BSRIAandHVACguidelines.Particularcareshouldbetakenwithregardsto;
oAccessibilitytovalveforsetting/adjustment
oTubecutting–aftercuttingandthreading,theendmustbedeburredorreamed
before fitting to the valve.
oJointing–nothreadjointingmaterialsmustbeallowedtoprotrudeinsidethebore.
oBracketing/supports–thepipingsystemshallprovidesuitablesupportandmustbe
carefully aligned and at the correct distance between centres for the size and type
of valve.
• Orientation: The Fig. 1051 can be positioned in any orientation.
• Normallyinstalledonreturnpipework,i.e.aftertheequipmentitiscontrolling,butcanbe
installed in flow if required.
• Ensure direction of flow is correct - indicated by an arrow on the valve body.
• Fig.1051 operates between a minimum and maximum pressure drop across the valve -
seecommissioningsectiononpage4.
• CFR’sarenotdesignedasisolationvalves.Dedicatedisolationvalvesshouldbeinstalled
toisolateagainstsystempressure,i.e.formaintenanceetc.,whendisconnecting/draining
pipework.
• Careshouldbetakentonotexceedmaximumoperatingdifferentialpressure,toprevent
damage to the internal components.
• SystemsshouldbeinstalledwithstrainerstoprotecttheCFRandotherinstalleditems.
• StraightlengthsofpipeworkarenotrequiredforCFR’sbutsomestraightlengthsare
recommended to create a more stable flow pattern.
Flushing
Controlvalves,liketheCFR,aresizedtogivegoodcontroloverthe
systemwater,therefore,havebeendesignedwithasmallconvoluted
flow path. These water ways may not allow adequate water velocities
forflushingofthecoil,evenwhenfullyopen.Therefore,inlinewith
BSRIArecommendations,itisrecommendedthataflushingpoint
belocatedbetweenthecoilandtheCFR.Thisallowsthecoiltobe
flushedwithoutthewaterpassingthroughtheCFR.
PleaserefertoBSRIAGuideBG29–2012forguidance.
