Morrison Bros. co. 174 Series Installation and operating instructions

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Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
174‑‑‑0101 PP
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Maintenance Instructions on Back
The 174 Series valves are designed where maximum pressure control is needed such as bypassing a pump in
order to reduce the pressure at the outlet.
Failure to follow any or all of the warnings and instructions in this document could result in a hazardous
liquid spill, which could result in property damage, environmental contamination, re, explosion, serious
injury, or death.
Installation
Warnings
• Fire Hazard – Death or serious injury could result from spilled liquids.
• Installinaccordancewithallapplicablelocal,state,andfederallaws.
• Foryoursafety,itisimportanttofollowlocal,state,federaland/orOSHArulesthatapplytoworkinginside,
above,oraroundthestoragetankandpipingarea.Useallpersonalprotectiveequipmentrequiredfor
 workinginthespecicenvironment.
• Pipingcouldbeunderpressure.Liquidandvaporsmaybeexpelledfromthepiping,valvesorttingswhile
performinginstallation.Liquidsandvaporscouldcatchreorcauseanexplosion.Avoidsparks,opename,
orhottoolswhenworkingonvalves.
Steps
1.Inspectvalveforshippingdamage.Donotuseifvalveisdamaged.Call
MorrisonBros.Co.forassistance.
2.Inspectvalveopeningsforforeignmattersuchaspackagingmaterial.
Remove any that is found.
3.Priortomountingthevalveinthepiping,verifytheintendeddirectionof
liquidow.Thevalveinletandoutletaremarkedontheappropriatehex
where the piping connects.
4.Applyanon-hardening,fuelresistantthreadsealanttothemalethreads
ofthepipe.Whenthreadingthevalveontothepiping,andthepipinginto
thevalve,makecertaintowrenchonthevalvehexclosesttotheendyou
arethreading.Connectpipingtovalveinletandoutletandcompletethe
rest of the piping.
5.Youmaynowintroduceliquidtothevalve.Inspectthevalveandpiping
forleaks.Repairasisnecessary.
6.Ifyouwishtoadjusttheopeningsettingofthevalve,removethelock
cap on the valve by loosening the single cap screw and slipping off the
lockcap.(SeeFig.1.)Thiswillexposetheadjustmentscrew.(SeeFig.
2.)Tochangetheopeningsetting,loosenthelocknutontheadjustment
screwandturntheadjustmentscrew.Clockwiseturningwillincreasethe
openingsetting.Counter-clockwiseturningwilldecreasetheopening
setting.Thereisstringpackingusedtosealaroundtheadjustment
screw.Thismayneedtobereplacedaftermakingadjustments.Itcan
bepurchasedfromMorrisonBros.Co.Onceyouhaveachievedyour
desiredsetting,tightenthelocknutontheadjustmentscrewandreplace
thelockcap.
Fig. 174 By-Pass Valve
Installation & Maintenance Instructions
FIGURE 1
LOCK
CAP
CAP
SCREW
FIGURE 2
ADJUSTMENT
SCREW
LOCK NUT
BONNET
GASKET

2
Morrison Bros. Co. ‑ Dubuque, IA ‑ 800‑553‑4840
174‑‑‑0101 PP
!
!
Failure to follow any or all of the warnings and instructions in this document could result in a hazardous
liquid spill, which could result in property damage, environmental contamination, re, explosion, serious
injury or death.
Maintenance
Annualinspection,ataminimum,isrequiredtoverifyvalveconditionandoperation.
WARNINGS
• Fire Hazard – Death or serious injury could result from spilled liquids.
• Followyouremployer’sinstructionsforinspectingvalves.
• Youmustbetrainedtoinspectthesevalves.Stopnowifyouhavenotbeentrained.
• Foryoursafety,itisimportanttofollowlocal,state,federaland/orOSHArulesthatapplytoworkinginside,
above,oraroundthestoragetankandpipingarea.Useallpersonalprotectiveequipmentrequiredfor
 workinginthespecicenvironment.
• Valvesandpipingcouldbeunderpressure.Liquidsandvaporscouldbeexpelledfromtankpiping,valves
orttingswhileperformingmaintenance.Liquidsandvaporscouldcatchreorcauseanexplosion.Avoid
sparks,opename,orhottoolswhenworkingonvalves.
Steps
1.Inspectthevalvebodyfordamage,leaks,orexcessivecorrosion.Ifanyarefound,replacethevalve.
2.Inspectthevalvebonnetgasket(SeeFig.2)fordamageorleaks.Ifeitherisfound,replacethebonnetgasket
withanoriginalreplacementfromMorrisonBros.Co.Note: Bonnetwillbeunderstrongspringpressure.Use
extreme caution when removing bonnet.
3.Toreplacethebonnetgasket,drainthepipeofliquidandpressure.Removethevalvebonnetandoldgasket.
Cleantheareawherethegasketsealsonthebodyandbonnet.Installthenewgasketonthebonnet.Applya
non-hardening,fuelresistantthreadsealanttothemalethreadsofthebonnet.Threadthecapintothebody
andtighten.Donotover-tightenthecaptothepointwherethegasketstartspushingout.Introduceliquidback
intothepipeandwatchthegasketforleaks.Ifleaksarefound,trytighteningthecapslightly.Ifleaksstill
persist,replacethevalve.
Failure to follow any or all of the warnings and instructions in this document could result in a hazardous
liquid spill, which could result in property damage, environmental contamination, re, explosion, serious
injury or death.
!