صفحه 1:
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4 مه
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nim |
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ir/
دوره ۱آموزشی - رگلاتورهای فشار
صفحه 2:
گلاتور هاء, فشار جگو نه کار قزر کودل:: .9
به استحضار می رساند؛ به منظور حفظ دقیق مباحث معنلئی» با توجه به
اينکه مطالب کاملا فنی می باشند از ترجمه متون استفاده شده»
خودداری شده است. لذا در صورت هر گونه ابهام در مطالب ارائه
شده با این شرکت مکانبه فرمائید.
صفحه 3:
Why is it important to regulate Pressure ina
Piping System?
Pressure is one
of the most
important
aspects of ANY
piping system.
If pressure is too
low, for example,
the system is
powerless. And
if it is too high...
صفحه 4:
Just as high blood
pressure damages
the vital organs in
your “piping system,”
overpressure affects
~-= filters, tools,
sprayheads,
mments...any
صفحه 5:
1 ۱1 (0560 01 ۸ 1لا5د05
a Recmlator. ۳
1 magine having
an employee who
continuously
monitors a single
pressure gauge,
and constantly
tweaks a valve as
downstream
pressure rises or
falls past a pre-
determined
point.
3
صفحه 6:
A Pressure Regulator
..and it won’t get carpal-tunnel. It
simply reacts to changes in
Sa
صفحه 7:
Uses of a Pressure
Regulator:
1. As a control element, to ensure
that downstream pressure does
not exceed a set point.
2. As a Safety device, to protect
equipment from harmful
overpressure.
3. Regulate to the correct
pressure range so that a flow
system or piece of equipment can
operate safely and effectively.
صفحه 8:
this simple definition: سنا
¢ A pressure regulator is a normally-
open valve that takes a high inlet
pressure and converts it to a lower,
ga stream ۳
صفحه 9:
ل .]
How 1. Wieser |
A Set Scre i 1
is used to set the desired
pressure. It does this by
controlling the force o:
wetted steel springs
The springs are attached to,
and the force-of+h
presses down, the main
shaft
The valve seat
is part of the main shaft,
and thus is held “ open’ ’ by
ور الى قدت
صفحه 10:
While the spring is holding the valve open and liquid
is flowing through, a small tube near the valve
outlet - called the “sensing orifice” - transmits
a pressure inta- chal 5
RESSURE
HAMBER
SENSING
ORIFICE
Because pressure is equal in all directions, the
[or pressure in the chamber is identical to
downstream pressure.
صفحه 11:
The key to this pressure chamber is a large Rolling
Diaphragm. It rolls upward as pressure increases,
and back down as pressure decreases...
ROLLING
DIAPHRAGM
PRESSURE
CHAMBER
SENSING
ORIFICE
VALVE OUTLET
ص 0
In other words, it moves up and down in direct
pressure.
response to changes in downstream
صفحه 12:
The Rolling Diaphragm is attached to the Main
Shaft that we mentioned earlier - which as you
recall, is held down by spring force, which in turn
1 00
جم
PRIN ROLLING
DIAPHRAGM
PRESBURE
BER
N
SEN$ING
os ORIFICE
VALVE
OUTLET
But when pressure at the outlet لپا
increases...
صفحه 13:
...as downstream pressure increases, the force on
the rolling diaphragm increases, in direct opposition
to the spring force...
صفحه 14:
When downstream pressure exceeds the spring force,
the rolling diaphragm overpowers the springs.
This compresses the springs and forces up the main
shaft...
صفحه 15:
The valve seat,
as part of the
main shaft,
closes against
the main
internal orifice,
preventing
additional
pressure
downstream.
It will remain
closed as long as
downstream
pressure exceeds
the set point, as
determined by the
set screw
صفحه 16:
When
downstream
pressure falls
below the set
point, the valve
begins to re-
open as the
springs again
force the main
shaft down.
Flow resumes.
صفحه 17:
Although accurate, the
preceding explanation is
overly simplified. In most
applications, a properly set
pressure regulator quickly
finds a “balance” - as long as
inlet pressure is higher and
relatively constant, and
downstream conditions are
stable. The valve stays
partially open, with the force
of the downstream pressure
against the rolling diaphragm
and the force of the internal
springs in a state of
equilibrium.
صفحه 18:
As events occur
nstrea
When a faucelO"
is closed
downstream,
pressure will
build in the
downstream
pipeline - and
at the outlet of
the regulator.
If the closed
faucet causes
downstream
pressure to
build to the set
point, the Wp لبلا
صفحه 19:
Similarly...
When the
faucet is re-
opened,
pressure will
drop in the
downstream
pipeline - and
at the outlet of
the regulator.
The spring will
force the
regulator open,
and pressure
will seek the
desired level
downctream _
صفحه 20:
What a Pressure Regulator WON’T Do:
(common misconceptions)
1. It can’t convert a low inlet pressure
to a higher downstream pressure - it
won’t function like a pump.
صفحه 21:
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