okay so we are going to demonstrate the testing of a double check valve assembly
according to the USC 10th edition procedures so the first thing I'm going
to do is I'm going to notify the inner owner that I'm gonna be doing the exam
I'm gonna identify the assembly it says right here on the tag that we've got a
double check valve see there's a direction of flow or arrow tells me the
directional flow this way and I'm just gonna observe to see if there's anything
crazy going on and that's the preliminary steps okay I'm going to use
an 8:40 a midwest 8:45 5 valve test kit however this test kit has the hoses
attached on it so I'm gonna manage my hoses so I don't need two of these hoses
I only need the high side hose on this test kit so I'm gonna take off the other
two hoses if I were using an old 830 test kit
like this one I would need to wrap the hoses that I might need that I don't
need around the test kit so I would wrap these two hoses around the test kit
if i were using one of these older style test kits okay so now that I've notified
identified inspect and observe first thing I'm going to do is get them flush
the test cocks so I'm gonna flush test cock number one test cock number two
tests cock number three
and test cock number four had some air into the Assembly
all right so I just there was some air in the assembly that you might have
heard when I was flushing I like using a sight tube so I'm going to put my sight
tube on test cock number three I'm gonna fill my sight to pull the water okay
next I'm going to put my compensating valve on test cock number two
I get in the habit of pointing the compensating valve towards shutoff valve number one
and that'll make more sense when we start doing Diagnostics gonna connect my
high side hose to the compensating valve I'm going to open up test cock number
two which will put pressure in my gauge so if you'll watch the gauge when I open
up the test cock drives the gauge to the upper end of the scale next I'm going to
make sure where my hose is going but I'm gonna vent the air out of the gauge by
opening up my high side bleed so making sure all the air is out of the hose and
out of the test kit all right and so I'm purging the test kit I'm going to close
shutoff valve number two I'm gonna elevate the test kit so that the centerline of
the test gauge is even with the top of my sight tube you may notice I'm
dripping some water out of this side of the test engage that's fine that's
normal no big deal okay so once I've elevated
I'm gonna isolate
and then next I'm going to open up the test cock and I'm going to test by
opening up test cock number three and watch observe what happens water falls
out of the test tube my gauge starts to drop now remember the minimum value on a
check valve is one PSI d and the other thing you have to have the conditions
you have to have is water needs to stop flowing out of the test tube and my
gauge needs to stop moving so at this point I'm observing that the water is
not rising anymore my test tube my gauge is stopped moving and I am at one point
eight psi D so I have a passing value because the check valve holds tight at
one point eight PSI minimum is 1 psi D all right now that I've got the reading
I can set down my test kit I'm gonna close my test cocks I'm gonna open up
shut off valve number one and this is to repressurize the assembly I'm gonna move
my test equipment down the test cock so I'm going to put the sight tube on test
cock number four all right and I'm gonna fill it back up full of water even
though it's got some water in it we're gonna fill it back up I'm gonna move my
compensating valve you can move the compensating valve and the hose together
down to test cock number three
I'm going to open test cock number three and again when I open it it's gonna
cause my gauge to drive my gauge up to the upper end of the scale I'm gonna
purge my gauge again by opening up the high sight bleed valve so I'm gonna perch
make sure that there's no air in the hose or in the gauge once I've purged it
I'm gonna again elevate the test kit to the so the centerline and the test kit
is even with the sight tube I'm gonna close shut off valve number one and now
I'm going to open test cock number four water is gonna come out of the sight
tube I'm gonna wait for the water to stop
flowing and my gauge is stabilized
alright it's rising just a little bit so I'm gonna wait a second
alright water is now stopped flowing my gauge is stopped moving I have a value
of one point two PS excuse me two point two psi D so I have a passing
value for my number two check valve so now that I have a passing value again
minimums one so that's above the minimum I'm gonna close my test cocks I'm gonna
open up shutoff valve number one I'm gonna get my customer back in service by
opening shutoff valve number two I'm gonna remove my test equipment and I was
going to fill out my test report completely accurately allegedly and that
concludes the test for the double check valve assembly you know the other thing
I'm gonna just make sure that I've got my
test cocks closed completely and now I'm done testing the double check valve
assembly