Construction And Operation Principle - SMC Networks IR2000 Series Operation Manual

2. Construction and operation principle

When the setting knob is turned, the
that flows in from the upstream side to pass through the
diaphragm(C) as nozzle back pressure, the
the supply pressure flows out to the downstream side.The air pressure that flows in acts on bottom
side of diaphragm(C) and while opposing the force generated by nozzle back pressure, it also acts
on diaphragm(A) opposing the compression force of the
pressure.When the output pressure raises above the setting pressure,
which makes the interval between the
drops, the pressure balance of upper/bottom part of
valve closes, the
downstream side is discharged to the atmosphere. In this way fine pressure variations are detected by
the nozzle/flapper type pilot mechanism, and precise pressure adjustment is performed.
SUP side passage
Setting
Displ
spring
m
N/m
flapper and the
exhaust valve opens at the same time and the excess pressure from the
Fixed orifice
Nozzle
1
flapper
Force Displ
Compd . spring
m
N
MPa/ m
(A)
m/N
nozzle is closed by the
fixed orifice. It then acts on upper side of
main valve is pushed down by the generated force and
setting spring and becomes the set
nozzle widens, the nozzle back pressure
diaphragms(C) is broken.Then as the
Setting knob
Setting spring
Diaphragm (A)
F
BLEED
Flapper
Exhaust valve
SUP
Main valve
SUP
Fixed orifice
Diaph.(C)
Press
Force
MPa
N
m
2
Daiph.(A)
Force
N
m
2
Block diagram
-6-
flapper, allowing the supply air
diaphragm(A) is pushed up
Main valve
1
Displ
MPa/ m
Compd. spring
m
(S)
(B)
m/N
Force
Diaph.(C)
N
m
2
main
Nozzle
Diaphragm(C)
OUT
Valve guide
Press.
MPa