okay I'm going to demonstrate the procedures for testing a pressure vacuum
breaker so I'm going to be using the USC 10th edition procedures so I'm going to
notify identify inspect and observe so I'm gonna observe that this is my
pressure vacuum breaker it says PVB on it so I know for sure
it's a pressure vacuum breaker I've got a direction of flow arrow that tells me
that my flow was up and out so I've got shut off valve number one
that's cock number one test cock number two and test cock
excuse me shut off out number two so I'm gonna remove the canopy and I'm gonna
flush my test cock so I'm gonna flush test cock number one and I'm gonna flush
test cock number two okay I'm gonna put my compensating valve on test cock
number one my compensating valve range bit up the test cock number one and I'm
gonna hook my high side hose make sure everything's tight hook my hose up to
test cock number two I'm gonna make sure all my other valves are off I'm gonna
open up the test cock number two which will drive my gauge up to the upper end
I'm gonna purge my gauge make sure there isn't in the air and the gauge or the
hose line okay I'm gonna close shutoff valve number two and on a pressure
vacuum breaker you test the air inlet valve opening point first air in that
opening has to be one PSI or greater so I'm gonna elevate my test kit to the
level the air inlet opening which is this level okay I'm gonna close shutoff
valve number one nicely and I'm gonna test the way I'm
gonna test the air inlet valve is that I'm gonna open up my high bleed valve
slowly okay so I'm gonna open up my high bleed valve slowly and I'm gonna put
my finger on the air inlet valve so that I can feel it when it opens now you
don't want to be in too big a hurry because this can happen rather quickly
so you may want to just tweak your needle valve so that you're just barely
moving it's hard for me to see from this angle okay so I'm and I can't read the
gauge from the monitor so but you can see how the gauge is going down and I've
got my finger on the an air inlet valve so what I'm looking what I want to do is
I want to watch the gauge and feel for when the air inlet valve opens if you're
trying to watch the air inlet gap valve and the gauge at the same time that's
not always so easy so I've got my finger on the air inlet I'm watching the gauge
it's still going down slowly
okay my air inlet open at 2.8 PSID all right now before I do anything else I'm
gonna close my eyesight bleed valve I'm gonna remove the hose I'm gonna set my
test equipment down and I'm gonna observe that the air inlet valve is
fully open so when I look inside here the waters below the air inlet valve and
I can tell that it's fully open I can see space between it so I would
report or record the air inlet valve is fully open okay in which case I'm gonna
close test cock number two I'm gonna re pressurize the assembly on these things
are messy so if you turn it on quickly it doesn't make as much as mess as if
you turned it on slowly so I'm gonna hook my hose up to my compensating valve
I'm gonna open test cock number one pressurize my gauge I'm gonna purge my
gauge by opening up my high bleed valve again making sure I don't have any air
or in the line so I've purged my gauge what I'm gonna test next is the the
value of the check valve so I'm gonna elevate the test kit to the proper
height will the check valves down here or at least the water will drain out of
the assembly to this point so that's the low point that water will drain out so I
need to have my test kit a little bit lower than what I did before so I'm
gonna isolate and I'm gonna test the check valve by opening up test cock
number two and remember when you're doing testing check valves the water has
to stop flowing and the gauge has to stabilize so this can kind of be a
little bit of an exercise in patience you might have noticed that the air
inlet valve popped open it's supposed to do that it's you know it seems a little
bit funky but it happens key thing is as I'm watching the wall
flowing out of test cock number two when it stops flowing in the gauge stabilizes
then I can take a reading for check the check valve and the pressure vacuum
breaker
again patience
all right so now water stopped flowing out of the assembly my gauge is
stabilized at 1.8 psi D it's above the minimum one so my check valve has passed
at one point a PSI d okay I can set my test kit down I can close my test cocks
I'm gonna close test cock number two close test cock number one I am going to
open up shutoff valve number one open up shutoff valve number two slowly to get
my customer back in service I'm gonna remove my test equipment make sure that
I put the canopy back on all right I'm gonna fill out my test report legibly
accurately and completely and that completes the test for the pressure
vacuum breaker assembly