baltur GI1000 Lx ME Mode D'emploi page 32

EXECUTION
Servomotor
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 suction chamber and the pump thrust chamber, for its 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 fixed disk on the valve rod, that can be seen through a slot, indicates the valve's 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 prescribed value adjustment can be placed under seal. Connection to gas
pressure take-off of 1/4". Thanks to the safety membrane, for inlet pressures up to 100 mbar, no gas vent tubing
is required. The maximum input pressure depends on the valve diameter.
Fro 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 300 mbar.
Where there is seal control, the system can withstand a depression of up to 200 mbar.
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 spring-
controlled membrane. The resistance of the spring can be adjusted and 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 opened 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.
INSTRUCTIONS FOR VALVES EQUIPPED
WITH PRESSURE REGULATOR
mod. SKP 20....
By removing screwed plug "C", access is
gained to the
screw "A" which adjusts the pressure.
Tighten to increase the pressure or
slacken to reduce the pressure.
Screw "D" at terminal "IV" adjusts the
position of "clean" contact intervention that
can be used for an external signal.
B type
(mm)
1,0
1,6 AGA22
1,8 AGA 23
31
N° 8882-1
REV.: 26-08-1992
Po colour
(mbar)
-- < 22 bright
< 120 yellov
< 250 red