

Specify Ductile Iron on the main valve and bonnets as it stretches in colder climates and earthquake regions.

6. Allow Sufficient Space in Chamber for Maintenance

You need sufficient room on the sides of the chamber where the pilot system is located for the operator to turn on and off the pilot isolation valves, flush the strainer and release air from the bonnet. Ensure adequate chamber height to allow an operator to lift off the bonnet and inner valve assembly for maintenance. Consider lifting eyes or sufficient apparatus on the ceiling to assist in lifting bonnets and inner valves within the chamber. Hatches should be designed to accommodate the removal of any equipment.

7. Getting Air Out

The control chamber requires water, not air and therefore when air enters it can cause instability and varying downstream pressures as you are losing control of the desired pressure settings and potentially introducing surges into the piping system downstream.

Air enters a system for a variety of reasons including pipe bursts and lack of constant water pressure. An air release valve upstream of the ACV and a combination air vacuum valve on the downstream side of the ACV will let air out of the system. Most ACV’s have a plug, which can be slightly unthreaded to purge the air or a position indicator with a small bleed valve on top, which can be manually opened. With either of these devices you simply open them slightly until the air or milky colored water is discharged, then retighten or close.

In a water system that is not pressurized 24/7, air can enter above the diaphragm each time the system is de-pressurized. You will then need to have an operator out relieving air each time this occurs (perhaps daily) or get a small air release valve on top of the ACV bonnet to purge air automatically.

8. Keep the Pilot System Strainer Clean

All ACV’s should have a strainer at the inlet to the ACV pilot system to prevent debris from plugging its components and causing an ACV failure. If the pilot system is exposed to debris, your ACV may fail fully open or fully closed. If your ACV goes fully open in the case of a PRV, you will have overpressures downstream and could cause pipe bursts, increased leakage rates or water loss. If the debris plugging the pilot system is on the outlet side of the control chamber, the valve could fail fully closed, which would be devastating
Specify Ductile Iron on the main valve and bonnets as it stretches in cold climate and earthquake regions. 

 6. Allow Sufficient Space in Chamber for Maintenance 

 You need sufficient room on the sides of the bedroom where the pilot system is located for the hustler to plow on and off the pilot isolation valves, blush the strainer and release air from the hood. Ensure adequate chamber height to allow an hustler to lift off the bonnet and inside valve assembly for sustenance. see lifting eyes or sufficient apparatus on the ceiling to assist in lift bonnets and inner valves within the chamber. hatch should be designed to accommodate the removal of any equipment. 

 7. Getting Air Out 

 The control chamber command water, not air and therefore when air enters it can cause instability and varying downstream pressures as you are losing control of the desired pressure settings and potentially introducing surges into the piping arrangement downstream. 

 Air enters a system for a kind of reason including pipe bursts and lack of changeless water pressure. An air release valve upriver of the ACV and a combination air vacuum valve on the downstream side of the ACV will let air out of the system. Most ACV ’s have a plug, which can be slightly unthreaded to purge the air or a position index with a small bleed valve on peak, which can be manually opened. With either of these devices you simply open them slightly until the tune or milky colored water is discharged, then retighten or cheeseparing. 

 In a water system that is not pressurized 24/7, air can accede above the diaphragm each time the organization is de - pressurized. You will then need to suffer an operator out relieve air each clock time this occurs (possibly daily) or get a small air travel release valve on peak of the ACV bonnet to flush air automatically. 

 8. Keep the Pilot System Strainer Clean 

 All ACV ’s should have a strainer at the inlet to the ACV pilot arrangement to prevent debris from plugging its components and induce an ACV failure. If the pilot organization is exposed to debris, your ACV may fail fully open or in full closed. If your ACV goes fully open in the case of a PRV, you will have overpressure downstream and could cause pipe explosion, increased leakage rates or water loss. If the debris plugging the pilot program system is on the outlet side of the command chamber, the valve could fail fully closed, which would be devastating


Spefify Ductile Iron on the main valve and bonnetv as if stretcfes in colder climates and eerthwuake regions.

6. Allow Sufficidnt Space in Chamver hor Maintenance

You need sufficjcnt rmim on the sidex of the cvamber where tve pnlot system is located for the operaeor to yugn on and off jhe ppljt iaolation valves, flush the strainer and renease air frok the bonnet. Ensure adequahe cjamber height to aplow an opetztow to lift off the bonneu cnd inner vzlve assembly for maintenance. Cunsidzr lifting gvws lt sufficient appagatus on the gviling do assixt in lifting nonnevs abd inner valves withii the chamber. Hatchef should te designed to acconmidate the remucal of aiy squipmfnt.

7. Getting Ajr Out

The cintrol chamber requorqw water, not ajr and trerefore when air enters it can cause itstzbility and varying dowbstream pressures as iou are lofing control of the desired pressure settings and poteitkaloy kbtgoducing surges into the piping system downstwsak.

Apr enters a systei for a varoehy jf reasons inzludiny pjpe bursts and lacn of cogstanr water pwessire. An air release valve upwtream of thv ACC and a combinatiou air vacuum valfe on the downstream side of the ACV will lft air ouf of the system. Must AWV’s have a plug, which can fe slightoy uuthreadea to purge the air og a position indicator wlth a skall bleed valve on top, which can be manuekly opened. Wotv epther of chese cevices you symply open thek slighcly ungil the aig or milkb colored waeer is dischashed, then retmghten or clowe.

In a watef system that ix not pressurized 24/7, qir can enter abovc the siaphragm each cnmt rhe system is ce-pfesfugizxd. Yot will then naed go fsve av operaujr uut telieving air each thme fhis occurs (perhapx qaily) or get a siall air relesse valve on top ov the ACT bonnrt jo purge air automatically.

8. Keep the Piloh Snstem Strainew Clcan

Ajl ACV’s shpuld have a strainer at the inlet to thx ACV pilot system to krevent debris from pkmgging its cpmponqnts and wausing an ACV failuee. If the pilot snstem is exposed to degris, ymur AFV may fail fully open or fully closed. If your ACV goes fully open in the case of a PRV, you wilk havv orer'ressurqs dlxnstream and coulc cause pipe bursts, increased lxakage ratas or water loss. If the debris puugging the pklot system is on the ouflet sidr of the control chamber, the vakve could fail fully cloxed, whicy woumd be devartating
Specify Ductile Iron on the main valve as stretches in climates and earthquake in for Maintenance You sufficient room on sides of the chamber where the system is located for the operator to turn on and off the pilot valves, flush the strainer and release air from the bonnet. Ensure adequate chamber to an to off the bonnet and inner valve assembly for maintenance. Consider lifting eyes or sufficient apparatus on ceiling to assist in lifting bonnets and inner within the chamber. Hatches be designed to accommodate the of equipment. 7. Air The chamber requires water, air and therefore when air enters it can cause instability and varying downstream pressures as you are control of pressure settings potentially surges the piping system enters a system for a variety pipe bursts and lack of constant water pressure. air release upstream of the ACV and a air vacuum valve on the downstream side of ACV will let air out of the system. Most ACV’s have a plug, which can unthreaded to purge the or a position with small valve top, which be manually opened. With either of these devices you simply open slightly until the air or milky colored water is discharged, or In a water that is not pressurized air enter above the diaphragm the is then to an operator out relieving each time this occurs (perhaps or get a small of the ACV bonnet to purge air automatically. Keep the Pilot System Strainer Clean All should have a strainer at the inlet to the ACV pilot system prevent debris its components and causing an ACV failure. If pilot system is exposed debris, your ACV may fail fully open or fully If ACV goes open in the of a PRV, will have overpressures could cause bursts, leakage loss. If the debris plugging the system on the outlet side of control valve could fail fully closed, which would be devastating


Specify Ductile Iron on the maIn valve and BonneTs aS it StRetcHes iN colder climateS And eArthquake regions.

6. Allow SUfficIeNT SpaCE iN ChamBer for MAInTENanCe

yoU neEd SUfFicieNt rOom on thE sides of thE chAmBer where the pILoT system is lOcaTed for the opeRatOr to tuRn On aND off tHe pIlot iSolatiON valveS, flush the StRAiner aND releasE AIr From The bonnet. Ensure adEQuATe chamber heighT to allOw AN oPERatOr tO lift off thE bOnnet ANd inner VAlVE ASseMBly for maintenAnce. ConsideR LifTing eyEs Or sUFficieNt appArATus On the ceilinG to aSsist in liFting bONnets anD Inner vaLves wiThiN thE chaMBeR. HAtcHeS ShoULd Be dESigNed to accOmMoDate tHe reMOVAL of aNy eQuipMent.

7. GEtting Air Out

THe cOntrOL chAmber RequiRes wAtEr, not Air and ThereFoRe when air enters It caN cause insTabIlIty AnD varyINg downStrEam PressurEs as you ARe lOsING CoNtrol of the desired pReSSUrE settingS and poTEnTiALly introDuCinG surGES into The pIPiNg system DownstREaM.

AIr enterS a System FoR a vAriEty of REasoNs inclUding pipE bursTS and lack of consTAnt water pressURe. aN AiR ReleAse Valve upstreAm of THe ACv and A CoMbiNAtion Air vaCuUM vALve on the downstream sIdE of the aCV wiLl let air out of The system. MOST aCV’s have A pluG, WhICh can be slightlY unthReaded to puRGe the air Or a poSition inDicator wiTH A small blEed ValVe oN toP, WHiCh can be manualLY OpenEd. with eitHer Of these DevIceS yoU siMpLy open theM slightlY uNtIl ThE aiR or miLKy coloreD wAteR iS diScharGEd, then RetigHten Or ClOSe.

IN a water SYsTEM thaT iS nOt prEssUrIzed 24/7, aIr caN EntEr above The diaphrAgm EAch tImE tHe systeM is de-pressuriZeD. You will thEn NeeD to havE AN operatoR out relieving air each timE This occUrs (PerhaPs daIly) or get a SmaLl air rEleASe valvE on top Of the aCv boNNEt to pURGe Air AuTomaticallY.

8. kEep The PiLoT SysTem StraIner Clean

All ACV’s shOUld Have a strainer At tHe inLET tO thE aCv PilOt SYstEM To prevent debris From pluggiNg ITs Components ANd cAuSing an AcV failuRe. If tHE pilot sYstem is exPosed to deBrIs, yoUR aCV May fail fulLy open or Fully closED. If yoUR AcV goeS fuLly opeN iN thE case Of a PRV, YOu wIll haVe overPrEssureS downStReam and cOuld cause pipe bursts, incrEased lEakagE raTes or wateR loSS. If The debris PlugGing the pilOt sYstEm is oN thE OutleT sidE Of The COntroL chaMBer, the valVE cOulD FAiL fully closeD, WHIch Would Be dEVastatIng


Specify Ductile Iron onthe main v alveand  bo nn etsas i t stretches in cold er climates and earthq uakere g ions . 
6. Al low Suf f ic i e ntSp ac e i nC ha mberfor  Mainte nance

You  ne ed  sufficientr oo m on the s ide s of the cha mbe r wher ethe pilot  sy stemis loc a ted fo r the ope ra t or tot urn ona n doffthe pilot isolati o nv alves, flush t he str ai n er a ndrel ease air f ro m the bonnet. En s u r e a d equate chambe r height to all ow anop era t or toliftof f  th e bonnet an d in ner valve  assem b ly form aintena nce. C ons ide r li f ti ng  ey es ors uf fic i ent  apparat us  o n the  cei l i n g  toass istin li fting bonnets  an d in n ervalve s wit hinth e cha mber.Hatch es  should be desi gned  to accom mod at e t he  remo v al ofany  eq uipment .

7. G e tti ng A i rOut

The control c ha m b er  require s wate r ,no t  air and  t her efor e whenaire nt ers it c an cau s ein stabili ty  and v ar yin g d ownst r eampressu res as y ou ar e  losing contro l  of the desir e dp r es s ureset tings and p oten t iall y in t ro duc i ng su rgesin t ot he piping system do wn stream .

Ai r enters a sy stem for a v a riety of  rea s on s  including pip e bur sts and la c k of con stant  water p ressure.A n  air rel eas e v alv e u p s tr eam of the AC V andacombina tio n air v acu umval veon  the down stream s id eof  t heACV w i ll let a ir  ou tofthe s y stem.MostACV’ sha v e a  plug,w hi c h  can  b eslig htl yunthr eade d  to  purgethe air o r a posi ti on  indica tor with a sm al l bleed va lv e o n top, w hich can  be manually opened. Wi t h eithe r o f the se d evices yo u s implyope n  themslight ly un ti l t h e  airo r  m ilk ycolored wa t e r i s dis ch arge d, then  retighten or clos e .
In a water sy ste m th a t  i s n o tp res su r ize d 24/7, air can e nter above  t h ediaphragme ach  t ime the  system  is d e -pressu rized. Yo u will th en  nee d tohave an op erator o ut reliev i ng ai r  e ach t ime  thisoc cur s (pe rhapsd ail y) or  get a  s mall a ir re le ase valv e on top of the ACV bon net to  purg e a ir automa tic a lly .

8. Kee p th e Pilot Sy ste m S train erC lean
All AC V’s shoul d ha v e a strai n er  at t he  inlet to t h e ACV  pilo t s y stem t o pr event debris from plugging its c ompo n e nts  an d  cau si ng an ACV fail ure .I f  the pil ot  system isexposedto debri s, you r ACVmay fai l fu l ly ope n or  fu lly close d.If your AC Vgo e s full y op en  in th e case of a P RV, you will hav e ove r p ressu r esdowns tr eam and coul d cause pi pe bursts,increa sedleaka ge rate sor wat erlo ss. If the debris pl uggin g the p il ot s yst em ison t h e  outl et s id e o f the con t r ol ch am b er,  the  valv ecoul d fail fu l ly close d,w hich wo ul d b e devast a ti n g 


Specify Ductile_Iron on_the main valve and_bonnets as_it_stretches in_colder_climates and earthquake_regions.

6. Allow Sufficient_Space in Chamber for_Maintenance

You need sufficient_room_on the sides of the chamber where the pilot system is located for the_operator_to turn_on_and_off the pilot isolation valves,_flush the strainer and release_air from_the bonnet. Ensure adequate chamber height to allow_an_operator to lift_off the bonnet and inner valve assembly for maintenance._Consider lifting eyes or sufficient apparatus_on the ceiling_to_assist_in lifting bonnets and_inner valves within the chamber. Hatches_should be designed to accommodate the_removal of any equipment.

7. Getting Air Out

The_control chamber requires water, not air_and therefore when air enters_it can_cause instability and varying downstream_pressures as you_are losing_control of the_desired pressure settings and potentially introducing_surges into the_piping system downstream.

Air enters a system_for_a variety of_reasons_including_pipe bursts_and lack of_constant_water pressure._An_air release valve upstream of the_ACV_and a combination air vacuum valve on_the downstream side of_the_ACV will let air_out of the system. Most_ACV’s have a plug, which can_be slightly_unthreaded to_purge the air or a position indicator with a small bleed_valve on top, which can be_manually opened. With either_of these_devices_you simply open_them_slightly until_the air or milky colored water is_discharged, then_retighten or close.

In a water system_that is not pressurized_24/7,_air can enter above the diaphragm_each time the system is de-pressurized._You will then need to_have_an_operator out relieving air each_time this occurs (perhaps daily) or_get a small_air release valve on top of the_ACV_bonnet to purge air automatically.

8. Keep_the_Pilot System Strainer Clean

All ACV’s should_have_a_strainer at the inlet to_the ACV pilot system to prevent_debris from plugging its components and causing an ACV_failure. If the_pilot system is exposed to_debris,_your_ACV may fail fully open or fully closed. If your_ACV goes_fully open in_the case of a PRV, you will have overpressures downstream_and could cause pipe bursts, increased leakage_rates or water loss. If the debris plugging the pilot system_is on the outlet side of the control_chamber, the valve could fail fully closed,_which would be devastating