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INSTRUCTIONS FOR REGULATING SIEMENS GAS VALVE SKP 25.003 E2
with pressure regulator
EXECUTION
Servo motor
The hydraulic control system consists
of a cylinder full of oil and a pump
with oscillating piston. There is also a
solenoid valve between the aspiration
chamber and the pump thrust chamber,
for closure. The piston moves on a liquid
tight joint in a cylinder that at the same
time hydraulically separates the suction
chamber from the delivery chamber. The
piston transmits the movement of the
stroke directly to the valve. A red scale
that is visible through a transparent slit
in the body of the servo motor indicates
valve travel.
Pressure regulator
The pressure regulator consists of a
membrane (there is a safety supple-
mentary membrane), a spring of the pre-
scribed calibre and an oscillating system
that activates a ball valve on the by-pass
between the suction chamber and the
hydraulic system delivery (see also the
section"). "Working"). Regulation fi eld:
0...22 mbar or (on spring replacement)
up to 250 mbar. The set value adjust-
ment can be placed under seal.
Rp 1/4 gas pressure take-off.
The maximum input pressure depends
on the valve diameter.
For diameters of 3/4" and 1" the maxi-
mum input pressure is 1200 mbar.
For diameters of 1"1/2 and 2" the maxi-
mum input pressure is 600 mbar:
For diameters DN 65 and DN 80 the
maximum input pressure is 700 mbar.
SKP 15.../ 25...
con connettore AGA62.000A000
Where there is seal control a depression
of up to 200 mbar can be withstood.
The body of the servo motor and of the
pressure regulator are made of die-cast
aluminium.
Functioning of valve with pressure
regulator
Using the valve with pressure regulator,
the valve's outlet pressure acts as a
comparative value on a membrane as-
sisted by a spring. The resistance of the
spring can be adjusted an constitutes
the "prescribed value" (set pressure
value). The membrane acts by means
of an oscillating system on a by-pass
ball valve between the upper chamber
and the servocontrol. If the comparative
value is lower than the prescribed value,
the by-pass is then closed so that the
servocontrol can open the gas valve.
Damping AGA 25 (optional)
Damping AGA 25 (optional)
1 Piston
2 Oscillating pump
2 Oscillating pump
3 Oil tank
4 Pressioner chamber
4 Pressioner chamber
5 Shaft
6 Closing spring
7 Work valve
8 Limit switch (optional)
9 Adjustment spring
10 Ball valve
40 / 75
0006081117_2006/09
N° 0002910940
REV.: 28/09/2005
If, on the other hand, the comparative
value is greater than the prescribed
value, the by-pass is to a greater or
lesser extent open so that the oil can
go to the lower chamber; the gas valve
progressively closes until when the
prescribed value and the comparative
value of the pressure are the same. In
this state of balance, the by-pass is open
so that its fl ow capacity is equal to that
of the pump. In this way the regulator
acts as a proportional regulator over a
very narrow band. The adjustment is
nevertheless stable since the speed of
travel variations is limited. Removing
the screwed plug gives access to screw
"A" which adjusts the pressure. Tighten
to increase the pressure or slacken to
reduce the pressure.
SKP 15.../ 25...
SKP 15.../ 25...
with connector AGA62.000A000
with connector AGA62.000A000
type
P gas (in delivery)
(mbar)
--
0... 22
AGA22
15...120
AGA 23
100...250
Spring
colour
bright
yellov
red
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