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(B) as nozzle back pressure, the
the supply pressure flows out to the downstream side. The air pressure that flows in acts on
diaphragm(C) and while opposing the force generated by
diaphragm(A) opposing the compression force of the
When the output pressure raises above the setting pressure,
makes the interval between the
the pressure balance of
closes, the exhaust valve opens at the same time and the excess pressure from 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
Force
spring
m
N
N/m
nozzle is closed by the
main valve is pushed down by the generated force and
flapper and the
diaphragm(B) and
Fixed orifice
Fixed orifice
Nozzle
1
flapper
Displ
Com pd . spring
m
MPa/ m
(A)
m/N
Block diagram
fixed orifice. It then acts on
diaphragm(B), it also acts on
setting spring and becomes the set pressure.
diaphragm(A) is pushed up which
nozzle widens, the nozzle back pressure drops,
diaphragm(C) is broken. Then as the
Setting knob
Setting spring
Flapper
Nozzle
BLEED
Exhaust valve
SUP
Main valve
SUP
Diaph.(B)
Press
Force
MPa
Compd.
N
m
2
Daiph.(A)
Force
N
m
2
-6-
flapper, allowing the supply air
main valve
OUT
Main valve
1
Press.
Displ
MPa/ m
MPa
spring
m
(S)
(B)
m/N
Force
Diaph.(C)
N
m
2
Diaphragm (A)
Diaphragm( B)
Diaphragm (C)
Exhaust
Valve guide