Hello everyone, I'm Kyle Andrews and today I'm gonna be going over our high
pressure control valves. Any time you guys have questions don't hesitate to
ask, I'll do my best to answer those questions. I've been at Kimray for eight
years. I started out in the construction department I then moved to the machine
shop and I was there for about three years and then I moved to product
applications, which is on the sales side of Kimray and most recently I became an
account manager and I've been doing that for about a year now. So high pressure
control valves can be used for a number of different applications. Some people
just think of them as being used for dump valves or for pressure regulation
but they can be used for both and a lot of different other things. You can use
this high-pressure control valve as a gas regulator. There's a couple different
pieces you have to add on to this valve to make it a gas regulator. There's a
pilot, supply gas regulator, drip pot and some other components, but it's a very
versatile valve. But just the valve itself can be used as a dump valve, using
it with a liquid level controller or some kind or a level switch. So one of
the main differences is that stem guided is unbalanced and cage guided is
balanced and what I mean by that - with the stem guided valve you see here the
red is upstream pressure and the blue is downstream pressure, so all the upstream
pressure is coming up over the seat and can be resting on that ball so you have
all that pressure that's pushing down on that trim, so it's unbalanced. So with
larger pressure drops you can have that valve can have trouble opening up
especially with the bigger trim sizes like our 3/4 inch and one-inch trims.
It can have trouble opening up against all of that pressure. Now with our cage
guided valves, as you see here, the the red pressure is still upstream pressure and
the blue is downstream pressure, but you see there's there's two communication
holes that take that upstream pressure and put
it on top of the piston as well as on bottom. So those two pressures cancel out
each other, so it's balanced, so there's no - that valve, whether it's got a
thousand psi pressure drop or a 10 psi pressure drop going across it it'll
still take the same amount of supply signal to open and close that valve - it's
balanced. Another difference between cage gutted and stem guided is the available
sizes - in stem guided we offer that in one and two inch connection sizes with a
variety of different trim sizes, but only one in two inch body connections. For a
caged guided valves we offer that in two inch through ten inch connection sizes
and then there is a full port in a reduced port for each connection size.
Right, so an advantage to the stem guide it is the tight control you can have so
with the cage guided their full port valves they can move a lot of volume but
on the lower end of flow they lack the control that stem guided valves can do.
So you can, in the one inch stem guided valve, you can get down to 1/8 inch
trim so you can have very tight control with low flow or high pressure
drop applications. You have - you can control flow very well and gas
regulation as well. With our cage guided valves we can flow a lot more just
because of the size of the valve and the trim characteristics you can have a lot
higher pressure drops across a cage guided valve than you can a stem guided so
then you can, you can force more through that valve with higher pressure drops. On
this chart we have the crack pressure of our valves. Right here is all the stem
guided valves and so you can see on here you have the different trim sizes and
then also a pressure drop and so we have you know where it'll
crack to work start to open and then at what pressure it is fully open and
that's supply pressure to the valve. We say in our catalog that the high
pressure control valves require 30 psi to actuate. With some of the smaller trim
sizes and lower working pressures you don't necessarily need 30 psi to to
fully actuate a valve. This chart here is good to have because it shows you at
what point the valve starts to move - starts to crack open - and then how much
supply pressure it takes actually fully open it with different trim sizes and
springs and then there's also the operating pressure at the very top. So
you can kind of see in the application that your valve is going into exactly
how much supply pressure will be required. It's kind of safe to assume 30
psi is gonna actuate, you know, any of these valves at under any conditions
so it's always safe just to have 30 psi but in case you don't have that and
you're wanting to know exactly how much you need, this is a good chart to look at.
No, so it would be, I mean, if your stem guided is the correct valve for your
application, the amount of supply pressure that is required isn't going to
affect that choice so it'd be more like, once you choose cage guided or stem
guided, it would be if you are concerned about supply pressure for that specific
value, you could look at this chart.
Our stem cut valve is a Class IV seal and that's
just a metal to metal seat. Our cage guided is Class VI and that is just a - it's
a soft seat seal. But then there's also a metal to metal backup on our cage guided
valves. So if that soft seat were to fail there's
metal to metal back up. In our stem guided series there's three different
trim types: snap, nominal, and equal percentage. Each one of them opens up at
a different rate. This chart here has the percentage of flow and then the
percentage of stem travel. So you can see the red line the snap trim opens up very
quickly let's say for example at 50% open it's almost 100% of
flow. The nominal opens up a little slower -
it doesn't really hit 100% open until you get to about 90% of the stem
travel. Equal percentage opens up very slowly it doesn't get it to 100% of flow
until you're 100% stem travel. So in our snap trim there's a carbide
insert and you see that that black piece there on the inside of the seat -
that's carbide - the ball is carbide so it's really resistive to any erosive in
the fluid that might be flowing. The nominal trim opens up a little bit
slower this is can be used for liquid dump valves, but the equal percentage
trim is used mostly for gas control. The reason being is because it opens up
slowly and so you can get really fine gas control and regulation. With the
equal percentage trim - you can also use equal percentage for liquid dumps or -
maybe you need a smaller CV, so, depending on your application you can get
different materials for the trims. You know, you have D2 as your standard but we
have stainless we have 174, 303 - there's different materials for the
seats and stems and so depending on your application just make sure you get the
right material.
If the application you're using this valve in requires you to use stainless
steel, we offer that material for stuffing box, the trim, and even the body
if necessary. We also offer different spring options
for the actuator portion of the valve. If you're working with really high
pressures or maybe you don't have enough supply gas to actuate the standard
spring, we do offer lighter and heavier springs for all of our control valves.
Kimray offers a lot of different types of elastomers depending on your
applications, temperatures, wear resistance - this is a good chart to look
at to find out what's going to work for your application. So Buna or Nitrile is
our standard. Kind of the next step up from that is gonna be HSN or highly
saturated nitrile and that's going to be good for most applications. If there's
H2S present, HSN is a really good option - or Co2 - and then it also has a little bit
higher temperature. If you want to go kind of a step further than that, AFLAS
or Viton is even a more robust elastomer that you can use. So inside the valve
body there's a stuffing box assembly. Here you can see all the internals - the
stuffing box will hold the stem, the packing,and the cage together. The
packing can come in two different options - we have the standard packing and
then we have Chevron packing. What the packing does is it keeps the the
pressure and fluid or gas from escaping from around the stem, so it seals around
the stem. It's live-load packing which just means that there's a spring that's
energizing the packing, keeping pressure on it so it's it's holding tight against
the stem. The Chevron packing - it works a little bit better, longer. It also has a
higher working temperature. So in this chart we show volume loss of our
different trim materials. Our standard steel trim will be good for most
applications. If you're battling sandy conditions or erosive conditions, you can
use our carbide trim - it's 2.5x times harder than our standard steel
trim. Even taking it a step further than that,
our Zirconia trim is 16x times harder than our steel trim. That would
be used for extremely corrosive conditions. For both our stem guided and
cage guided valves we offer a lot of different options for connection types -
threaded and then flanged - and this chart here lists out the working pressures of
of each flange. So you can see we offer a lot of different flange options
depending on the pressures and connection types you guys are working
with. So we talked about how you can use high pressure control valves for dump
valves or pressure regulation - right here we have a one-inch stem guided valve
being used in a back pressure application. You can see there's the
valve itself, then there's the pilot drip pot and a supply gas regulator and what
the pilot is doing it's just monitoring the pressure the upstream pressure and
then it's it's making adjustments to the valve to regulate that pressure. If
pressure overcomes the spring and the pilot the pilot will tell the valve to
come open to relieve that pressure to get back down to your setpoint. The drip
pot - it just takes supply gas off the upstream of valve and knocks out liquids,
and then the supply gas regulator regulates that down to 30 psi for the
pilot. All of our back pressure packages will come fail open or pressure closed.
All of our pressure reducing packages will be fail closed. The reason for that
is because in back pressure you're concerned
about what's upstream of the valve. So in case of a failure scenario, for back
pressure, the valve would open to relieve that pressure saving whatever equipment
or whatever is upstream of the valve. For pressure reducing valves, you are
concerned about what's downstream of the valve so if something were to
fail with the valve or fail with something, you want that to go closed - to
fail close - so that way you're saving whatever is downstream of that valve. If
you're needing to switch the fail position of your valve, it's really easy.
All of our top works are field-reversible so you can take the top works
apart, flip the spring and diaphragm assembly 180 degrees and then put the
top back on and that will change the fail position of the valve. So let's say
if you're taking a PR package and you're wanting to use it in a back pressure
application and you need to change the fail position of the valve, it's very
easy to do that and you don't have to buy a completely new valve, you can
just flip the top works of the valve.
I hope you found this helpful! If you would
like this training in-person - over this section of the catalog, or any other
product, please get in to contact with your local Kimray store, we'd love to
come out to your location or you to come to our store and give you this training.