34
type
P gas
(in delivery)
Spring
(mbar)
colour
--
0... 22
bright
AGA22
15...120
yellov
AGA 23
100...250
red
Legend:
1 Piston
2 Oscillating pump
3 Oil tank
4 Pressioner chamber
5 Shaft
6 Closing spring
7 Work valve
8 Limit switch (optional)
9 Adjustment spring
10 Ball valve
INSTRUCTIONS FOR REGULATING SIEMENS
GAS VALVE SKP 25.003 E2
with pressure regulator
N° 0002910940
REV.: 28/09/2005
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 supplementary membrane), a spring of the prescribed
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 field: 0...22 mbar or (on spring replacement) up to 250
mbar. The set value adjustment 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 maximum input pressure is 1200 mbar.
For diameters of 1”1/2 and 2” the maximum input pressure is 600 mbar:
For diameters DN 65 and DN 80 the maximum input pressure is 700 mbar.
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 assisted
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. 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 flow 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... with connector AGA62.000A000
Damping AGA 25 (optional)
Summary of Contents for BGN 40 DSPGN-ME
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