Good morning guys, welcome. Today I’m going to be going over section A in our catalog. That includes
back pressure valves, PR valves, and we’ll also cover the ounces valves. If you guys
have any questions don’t hesitate to ask. So we’re going to go ahead and dive
right into this presentation. All of our section A regulators are integrated
valves and what that means is that the pilot and the valve body are one piece.
As you can see from this picture here the spring and that upper portion of the
valve is connected to the body which is different from some of our control
valves; which the control valves is standalone from the pilot or whatever is
controlling it. A control valve by itself won’t do anything until it’s told what
to do by a pilot. You don’t have to add pieces on to the valve to get it to work.
So back pressure valves are used to hold back pressure on vessels and equipment
and that just helps in the movement of the liquid. If you think about a
separator like this if it didn’t have any pressure being held on it when that
dump valve opened up that fluid would not be forced out of that piece of
equipment and sometimes there’s several pieces of equipment that liquid has to
move through and if you don’t have that back pressure, it’s not going to force
that liquid out and cross maybe 50-60 feet of pipe and then up into
another vessel. So, holding back pressure is very critical for the flow of liquid
through production equipment. Think of it like a water gun. If you put water in a
water gun and pull the trigger, nothing’s gonna come out of the water gun. It has
to be pressurized – you have to pump air into it, that way when you squeeze the
trigger, that liquid is forced out; that just aids in the separation process.
To go over the function of this valve we’ll watch a quick video that’ll
explain how it’s working. This valve monitors upstream pressure.
To adjust the setpoint turn the bolt on top. The spring pushes down on the
diaphragm assembly which positions the pilot plug. The pilot plug then allows
gas from the upstream to push down on the diaphragm. The flow through this
valve is from underneath the plunger. The flow pushes up on the plunger as the gas
is pushing down on the diaphragm. Because the diaphragm has a larger surface area
than the plunger, the same pressure can hold the valve in a closed position. You
have now reached your back pressure set point and the valve will begin
regulating the pressure. If the setpoint is exceeded, the upstream pressure pushes up on the diaphragm assembly closing off the pilot plug. This allows gas to be
vented from the top of the diaphragm and the upstream pressure to be regulated. So now we can go over the function of the valve and how it operates. The red
pressure is upstream pressure and that is communicated through the tubing to
underneath the spring. So you can see the red pressure is up underneath that
diaphragm and the spring is your adjustment point so the more tension you
put on that spring the further down you adjust the screw the more back pressure
that’s going to hold. Whenever that upstream pressure is able to overcome
the tension of the spring, so you’re above your setpoint, it’s going to lift
that diaphragm assembly which lifts the pilot plug and the pilot plug seats.
So the larger ball is going to seat and the smaller ball is going to eventually
raise up off of its seat which is going to vent the yellow pressure and that
yellow pressure is keeping that valve closed. So as soon as it vents that
pressure off, the upstream pressure the red pressure that’s pushing up on that
seat is able to push open the valve and it’ll start relieving that pressure. Now
once that pressure comes back down below your set point or that spring is able to
overcome and push against the upstream pressure it’s going to seat the small
ball. It’s going to keep pushing down and
eventually unseat the larger ball which is going to allow upstream pressure to
fill that cavity where the yellow pressure is and that’s going to close
the valve. So you have the the upstream pressure pushing up on the seat but then
you also have the same upstream pressure that fills that cavity, but because that
cavity is a larger surface area, it’s able to hold that valve closed even with
that pressure pushing up on the seat. Just because it’s a larger area
that creates more force to hold the valve closed eventually this valve will
get to the point where it’s making very fine adjustments – the pilot plug does not
have to move very far to vent that pressure to open the valve but it will
get to that point where it’s just it’s hanging out it’s throttling right at
your set point it doesn’t make large swings and pressure. Right there is, there’s an o-ring it’s kind of hard to see but there’s a communication hole
that’s drilled right where that stem goes through and it basically allows
that oil just to sit on that stem to keep it lubricated but that oring in
there it has an o-ring and two teflon backups that keeps that oil from getting
into the gas stream. Now that you guys have a basic understanding on the function of this valve we’ll go over some troubleshooting and common problems that we see with this valve in the field. The most common issues that we see with this
valve is wet gas or trash getting into the pilot plug area of the valve. They’re
very small seating surfaces and it doesn’t take a lot to keep those from
seating and sealing off the seating surface. Especially on the smaller ball –
it’s so small any liquid or trash that gets on that it’s going to keep it from
seating off. And so that’s that’s the biggest issue
that we fight with these valves. Absolutely, so if there’s moisture
getting in the pilot plug it’s not going to be able to seat so it’s going to be
continuously venting. It’s not going to control your setpoint like you want it
to. Something you can do without taking the valve apart – I just run the
adjustment screw down quickly and then back out quickly. Basically what that
does is it forces the valve to change position because it’s trying to control
a different set point and sometimes you can get that will cause the the valve to
exhaust gas quickly enough to to blow out that liquid to clear any trash or
liquid that’s sitting on the pilot plug. If there’s quite a bit of liquid or a
big piece of trash sometimes you can’t get that to clear and then you have to
open up the valve and and do maintenance on the valve that way. Another common
issue is not removing the plug out of the oil bowl. When the valve is first
installed all of our valves have an oil bowl and that’s just to keep the stem
lubricated. When we ship these things it’ll have a plug in it like this one
does and that’s just to keep – you know when they’re in the box they’re on their
side – that’s just to keep the oil from spilling out and so when you take this
out of the box and install it you’ve got to make sure to take out that plastic
plug because if you don’t this valve won’t be able to exhaust that gas and it
won’t be able to open up so it’s just gonna stay shut; it’s not going to move. It
may move once but it’s it’s not going to move again. Next we’re going to talk
about the pressure reducing valve or PR valve. It functions a lot like the back
pressure valve but it’s controlling downstream pressure
the most common applications for this valve would be a section controller on a
compressor so you’re taking a higher upstream pressure and reducing
it down to the suction setpoint of that compressor so a PR Valve would be used in any application where you want to reduce pressure. So not only a suction control
valve but if you were going from 250 psi and you’re going down to poly pipe and
you needed it to be below 80 psi this would reduce that pressure down so that
way you don’t over pressure the poly pipe. Just anytime you need to reduce
pressure and regulate downstream is when you would use a PR valve. You can see on
this picture here, red is still upstream the blue is downstream pressure and so
you have a piece of tubing that communicates the downstream pressure to
underneath the spring so the spring is still the adjustment point. If downstream
pressure is overcome by that spring – so that means you’re below setpoint – then
the the pilot plug is going to seat the small ball and unseat the large ball;
which puts the red pressure (upstream pressure) underneath that diaphragm and
that’s going to allow that valve to open. As your downstream pressure then begins
to rise back up to setpoint, now once you get to setpoint the blue pressure or
downstream pressure will overcome that spring the large ball will be seated and
the smaller ball will be unseated allowing the yellow pressure to vent
that atmosphere which will then close that valve. So once you get up to
setpoint the valve is going to close and then once you get below setpoint the valve’s
going to open. This one’s got a little bit more tubing on it – looks a little
bit more complicated – but it functions basically the same way as the back
pressure valve. This valve controls downstream pressure.
To adjust the setpoint, turn the bolt on top which will compress
the spring. The spring pushes down on the sensing diaphragm assembly which
positions the pilot plug. The pilot plug then allows gas from upstream to flow
under the motor valve diaphragm. The pressure is controlled under this
diaphragm to position the plunger to any changes in flowing conditions. If the
setpoint is exceeded the downstream pressure pushes up on the sensing
diaphragm assembly closing off the pilot plug. This allows gas to be vented from
underneath the motor valve diaphragm and the downstream pressure to be regulated.
A constant downstream pressure is then set. Because the diaphragm has a larger
surface area than the plunger, the same pressure can hold the valve in a closed
position when needed. You’ll notice that the pilot plug assembly in this valve is
flipped from what it is in the back pressure valve, and back pressure valve
the larger ball is on top and the smaller ball is underneath. This one
is flipped the other way and there’s one more piece of tubing on the pressure
reducing valves and the spot where it vents the the gas either opening or
closing the valve is up top so it’s in a different place as well. Next we’re going
to go over the pressure reducing and back pressure ounces valves. They operate all in the same way as the regular PR and BP valves do the biggest differences
are the size of the sensing diaphragm and the size of the adjustment spring. So
the adjustment spring is much lighter, it’s smaller and the sensing diaphragm
is much larger. You can see this one here’s a pressure reducing ounces
valve so the sensing area – that downstream pressure – is communicated to that diaphragm is very large and that’s just to get it to be able to sense
very light pressure – ounces. It’s got to have a large surface area to create
enough force to move that spring. The back pressure will be the same way
except we’d be pulling upstream pressure to that diaphragm to send upstream
pressure. The troubleshooting for these are all the same as the other valves: wet
gas is the biggest problem. For the ounces PR Valve or the OPR. You would be using this for a suction control on a low suction compressor or anytime you
want to reduce down to ounces or just a few pounds. For the back pressure valve
ounces or the OBP you would use that to hold back pressure on tanks
or you could use it to hold back pressure on very low pressure equipment.
There’s three spring options available for this valve there’s a two and a half
pound a five pound and a 20 lbs. spring. The 20 lb. spring goes from one pound
to 20 lbs.; the 5 lbs. spring goes from one ounce to 5 lbs.; and the
2.5 lb. spring goes from a half an ounce to 2.5 lbs. So depending on your control pressure that will determine what spring that you
put in this valve. So you can have, for the PR valve if for example, you can
still have up to 300 pounds on the upstream side of the valve body and
still reduced down to ounces. It’s not going to control very well with that
high of a pressure drop but the valve body is the same as all the other
regulators it’s just the pilot portion that’s different. Next we’re going to go over liquid back pressure valves. This can be used in
applications where you have extremely wet gas in the valve body and you need
to bring in an outside supply of dry air gas to operate the valve or anytime
you’re holding liquid back pressure on a vessel or a pump. What’s good about this
valve being used in liquid applications is it has an outside source of gas. So
where you see the purple gas coming in you would bring that in from an air
compressor or a higher drier spot where you can get good dry gas from or air.
It’s the back pressure valve with an outside source of instrument air.
Converting a regular back pressure valve to one with outside supply like this one
is fairly simple there’s just a couple of pieces you need – so you can go from an AAR which is a back pressure valve to the AEM which is the liquid back
pressure valve fairly easy. So if you’re fighting wet gas
and having issues because of that you can convert to a liquid back pressure
valve and solve a lot of those problems. You should make sure that the
elastomers you have in your valve are compatible with whatever’s in your fluid
we offer a lot of different elastomers. If you already have an existing valve
that’s having issues with failed diaphragms or our rings you can just buy
the repair kit with the appropriate elastomer type in it and kit the valve
and solve those issues. These regulators are available one inch through six inch
and the pressure rating is 300 pounds for threaded connection or 250 for
flange connection. Thank you guys for coming out for this training if you guys
think of questions later on you can email us or you can give us a call at
our store number and we can answer those questions our setup more training for
you guys. Thanks for watching this training. If you found this information
helpful and you’d like this training in person for you or your team, contact your
local Kimray store.