Okay, next, I would like to demonstrate how to test an RP
using a two-valve test kit. Personally, I prefer two-valve
test kits, just because they're simpler and there's a lot less
that you can do wrong to screw it up.
The other thing about a two-valve test kit is that, if
you think about it, when you test the pressure vacuum
breakers, both the spill-resistant vacuum breaker
and the pressure vacuum breaker and the double check valve
assembly, the only thing you ever manipulate on the gauge as
far as the valves is the high-side bleed valve.
So the majority of the time, if you're not testing RPs, you're
only using the high-side bleed valve, and you got four extra
valves there. So the other thing is is that
the control valves, or the three extra valves that are on the
bottom of a five-side -- on the five-valve kit, are essentially
just to do what you can also do with the two-valve kit without
having to mess around with the hose is really the only
difference. So I'm going to going to
demonstrate how to test an RP assembly using a two-valve kit.
So you start off the same way, where you should flush the test
cocks. Well, obviously, you're going to
notify, identify, inspect, and observe.
And, then, we're going to flush the test cocks in the right
order. So test cock number four, leave
it running. Test cock number three, leave it
running. Test cock number four -- or,
excuse me, test cock number two, leave it running.
Trying to get it so I don't spray the ceiling.
And test cock number one. And I'm going to shut test cock
number one off. I'm going to shut off test cock
number two. Shut off test cock number three.
And shut off test cock number four.
And, then, I'm going to use a digital gauge.
I'm going to make sure that my needle valves are closed, make
sure my hoses are hooked up tight.
So I've got my red hose took it up to the high side, the blue
hose hooked up to the low side. And on my yellow hose, yes, I
want my yellow hose hooked up to the downstream side of my
low-bleed valve. So, now, I'm going to connect my
hoses to my assembly. The high-side hose goes on test
cock number two. My low-side hose goes on test
cock number three. All right.
I'm going to turn on test on test cock number three.
Right, and I'm going to purge the hose in the assembly.
And, so, when I open this low-side bleed valve, not only
am I going to purge all the air out of this hose and through my
test kit, I'm also going to purge any air out of my yellow
hose here. So, I'll just hold this up, so
that when I open this up, you know, this may take a second,
depending on when the last time you used this hose and whether
it's full of water or not. So I've got flow going through
the assembly. I've got water going through my
hoses. So I've opened up my low-side
bleed. I'm going to open up my
high-side bleed. And it's just going to go route
right here. It, of course, helps if you also
open up test cock number two before you open up your
high-side bleed. So I'm going to open up my
high-side bleed. Got water coming out there,
purging the air out of it. You can see that happening.
I got water coming out of my other hose, too.
With both of them running, I'm going to reach down, close
shutoff valve number two. Going to close my high bleed,
and, then, I'm going to close my low bleed, and wait for my gauge
to settle. And that is the apparent
differential across check valve number one.
So I can proceed with the test. Now, to find the relief valve
opening point, instead of manipulating the control valves
on a five-gauge kit, all I'm really going to do is I'm going
to use this yellow hose to jump between the low side and the
high side outside of my gauge, all right?
So now I have these two hooked together.
And by using the needle valves that are, you know, these bleed
valves or needle valves, I can manipulate them just like I do
with the control valves. So what I'm going to do is I'm
going to open up the high-side bleed approximately a turn.
So I'm going to open this sucker up a turn.
And, then, I'm going to slowly open this no more than a quarter
of a turn.
So what, essentially, I'm doing is I'm taking water that's going
through here through this valve. Now, it's going around the hose,
and when I open this bleed, now I'm going to force it back
through the blue hose. So I can open this up just
slightly and put my hand under there, and it opened at 3.7
psid, all right? So my relief valve opening point
was 3.7 psid. Now, what I'm going to do is I'm
going to close both bleed valves.
And, essentially, what I need to do now, the tech -- check to
make sure check valve number two holds tight is I need to route
water from this test cock over to this test cock.
Well, again, I can do that by, basically, if I take this hose
off the low side and, then, connect it to test cock number
four, and this time remember to open up the test cock, all
right, I'll open up the test cock.
Now, some people say, hey, wait minute, you didn't bleed that
vent hose. Well, when you're using a
two-gauge -- or two-valve kit, you don't need to bleed the vent
hose, because the vent hose is full of water already.
You already purged that in an earlier step, okay?
So, now, when I open this needle valve, I am basically connecting
these two hoses together. So the pressure coming through
this hose will be the same pressure going into this way.
And, so, that's how we put pressure on the back side of
check valve number two. So when I open my high-side
bleed -- oops, sorry, also need to reestablish the zone.
So I need to reestablish the zone, back to my apparent
reading of 8.6, 8.7, what it was before.
And now I'm going to open the bleed, the high-side bleed.
You know, it's going to vary a little bit because it's got to
move a tiny amount of water. But you notice that the relief
valve didn't open. So in that case, check valve two
holds tight. So I need to reestablish the
zone one more time by reopening my relief valve here and closing
it, all right? And, then, my true value across
check valve number one is 9.0 psid.
So that is how you would test an RP assembly with a two-valve
kit. At this point, you would do the
same, just like you would do with any other type of test kit,
is you would close the test cocks, return the customer to
service, remove your equipment, you know, notify the customer
that you're done. And, then, you know, fill out
your test report form completely, accurately, and
legibly. And away you go.