okay now I'm gonna demonstrate to you the common faults that you might see
while when you're taking the Department of Health backflow assembly test exam is
related to the pressure vacuum breaker so again I'm gonna be testing your
pressure vacuum breaker I'm going to set up a fault simulation here alright and
so I'm gonna notify identify inspect observe I'm gonna make sure that I'm
testing the pressure vacuum breaker so this pressure vacuum breaker on here
I've got a flow direction of flow area arrow shut off valve number one the test
cock number one shutoff valve number two tests cock number two so I'm gonna purge
my test cocks or flush my test cock will flush test cock number one flush test
cock number two replace my compensating valve run test cock number one I also
need to make sure I remove the canopy
hook up my high side hose
maybe okay hook up my hose to test cock number two I'm gonna open up my test
cock which you drive the gauge test cock number two which will drive the gauge
through the upper end make sure all the other valves are closed and I'm gonna
purge my hose and my assembly or my test kit sorry okay so the first thing I'm
gonna do well I'm gonna close shut off valve number two
remember again the first thing you test is the air inlet valve so I'm gonna
elevate the tips kit to the proper height which is up here I'm close
shutoff valve number one and to test the air inlet valve I'm gonna slowly open my
high bleed valve
and I'm gonna open it up just to hair more
okay well I still got a pretty good stream of water flowing through my my
test kit coming out my hose here and my bleed valves open and you notice that my
pressure isn't really going down and and you know something's going on well
what's going on is that I have a leaking shutoff valve number one obviously I've
got water coming into the the body of the assembly from somewhere if this is
installed properly the only place it should be coming from is shutoff valve
number one all right you can also verify that by essentially checking to see if
it's shutoff valve number one by opening test cock number one and see if water
it's he basically doing the same thing you would with a compensating valve but
you know opening this compensating valve isn't gonna do anything for me if the
test cock isn't open so I'm gonna open the test cock slowly and see what
happens
and I'll notice the water continues to flow out a test cock number one again
that's an indication to me that I have to shut off a leaking shutoff valve number
one so I would say Proctor I have a leaking shutoff valve number one in
which case the Proctor would say problems been corrected I would open up
open up shutoff valve number one just to make sure the pressure is right
I would purge my test kit again just to make sure it's right I'm going to
elevate to the proper height here and I am going to now test test cock or excuse
me I'm gonna test the air inlet valve opening point by slowly opening my I
bleed valve alright this time my gauge is dropping so I know it's not a leaking
shutoff valve well okay remember the minimum opening point is one psi D I'm
waiting I'm observing my gauge I'm looking at the gauge movement monitor
I've got my finger on the gauge or on the air inlet opening something doesn't
seem right here well it's still going a little bit
alright I'm gonna open my bleed valve just to hair more
all right just the hair more remember don't open it too much
well my value on my gauge or my gauge is gone below one so this has not met the
minimum value and in fact if I open up my bleed valve a little bit more I
actually get my gauge to go to zero in which case this would indicate that my
air inlet valve is stuck so always remember on air inlets whether it's on the
pressure vacuum breaker or as will show later on the RP 0 equals stuck so my air
inlet is stuck all right so I'd say Proctor my air inlet is stuck which case
the Proctor would say problems been corrected I would set my test kit down I
would again open up shutoff valve number one to repressurize everything I would
purge the assembly ok elevate isolate I'm gonna check something elevate
isolate and test the opening point of the air inlet valve
so I'm going to again open up my high bleed valve I've got water coming out
the little hose like it's supposed to be I'm gonna observe my gauge gauge is
dropping like it's supposed to be all right I'm gonna face it towards me for a
second so I can see the reading
okay my air inlet valve opened up a 2.8 PSID I'm gonna close my high side bleed
valve remove my high side hose set the kit down
observe that my air inlet valve is fully open air and i would state that to the
proctor proctor my air inlet valve is fully open I'm going to close test cock
number two I'm gonna re-energize the assembly I'm gonna hook my high side
hose up to my compensating valve I'm gonna pressurize everything by turning
on test cock number one which pressurizes my gauge I'm gonna purge my
gauge by opening up my eyesight bleed valve and I'm going to test my check
valve so again I'm gonna elevate the test kit to the proper level which in
this one that the proper level is here where the water will drain out okay so
I'm gonna elevate I'm gonna isolate and I'm gonna test by opening up test cock
number two
well what gets me is that's just even though my task age has gone down it's
not going down any farther I've still got a pretty good stream
coming out of my test cock number two I think I've got water coming into this
assembly so I'm gonna double-check by in this case because this test cock is open
and because you do have the high side hose hooked up the compensating
valve I can open up my compensating valve and when I do that the amount of
water flowing out of my test cock has gone down my air inlet valve did
actually pop open okay I can also at this point if I close this because my
air inlet popped open I get enough water to flow out of the
air inlet valve but not enough volume to actually get it closed so at this point
I could say Proctor I have a leak and shutoff out number one and again just
like on the double check valve because your opening and closing this it could
possibly that your shutoff valve holds when you do the air inlet valve but then
doesn't hopefully do the check valve so in this case I would say Proctor I have
a leaking shutoff valve number one Proctor would say problems been
corrected you're gonna want to close test cock number two you don't want to
re-energize the assembly re-pressurize it purge everything elevate isolate and
test
so now my gauge has gone down like it's supposed to air inlet opened up like it
was supposed to but a wait a minute when I look at my test kit the gauge is gone
below zero or excuse me I always keep saying that gone below one minimum value
is one at this point I have a failed check valve I don't have to wait for
this to stop I know already I have a failed check valve so I could say
Proctor I have a failed check valve Proctor would say problem has been
corrected in which case you would close test cock number two you would
re-energize the assembly I would purge everything again just to be on the safe
side okay elevate isolate and again you're gonna
test check valve number the check valve by opening up test cock number two and
again you always got to remember the conditions for testing a check valve are
that water stops flowing and the gauge is stabilized so we're gonna sit here
and wait a minute for the water to stop flowing
[Singing]
oh it's getting close I think
and again this is an exercise in patience so there we go water stopped
flowing I can now read the value my value is 1.9 PSID
so check valve holds tight at 1.9 PSID which case I can set the assembly down
close test cock number two close test cock number one I like to put the canopy
back on before I turn it on just so I don't get water everywhere like it
before so I've got shut off out number 1 on I'm going to open up shutoff valve
number two to get my customer back in service I don't have the test cock
closed completely
so I'm gonna make sure I've got all my equipment removed got the canopy back on
customer back in service so I am done testing the pressure vacuum breaker
assembly in the real world I would fill out my test form completely accurately
and legibly and that would conclude the test like I
said hopefully the Proctor will say which assembly do you want to test next