53
Pressure Setting
Oil pump pressure setting
Before commissioning the pump and oil
pipes must be primed and vented.
1. Pump pressure
- 28 to 30 bar for light fuel oil
- 30 to 32 bar for heavy fuel oil
So as to protect the pump against
excess pressures, the oil pressure con-
trol valves of the high pressure pump
have been factory set to 40 bar. The
effective pump pressure is set and adju-
sted at the burner control block or at the
pressure control valve.
2. Pressure setting at the control
valve (loop feeder pipe) at the
burner pipe pressure
Light fuel oil setting
Loop feeder pipe pressure 1,2 - 1,6 bar
Heavy fuel oil setting
In order to avoid evaporation of the
water in the fuel oil, the pressure in the
loop feeder pipe must be at least
-see table:
Pressure control valve
In the piston-type pressure control
valve, a piston (1) movably arranged in
a cylinder is pressed against the valve
needle (3) by a spring (2). As the pres-
sure on the side of the valve needle
rises above the spring pressure, the
piston will be lifted and the oil caused to
flow over to the pressureless side.
For the installation of overflow valves of
this type the following general informa-
tion should be observed:
The spring side (spring can be seen
from outside) must in any case be cho-
sen to be the return side, i.e. the pres-
sureless side. Consequently, the
direction of overflow is from the pressu-
rized side to the pressureless spring
side. Any counterpressure on the return
side must thus be added to the selected
spring pressure setting.
It is of no consequence for the operation
of this type of valves whether they are
mounted in continuous lines or at line
ends.
The desired pressure is selected by
means of the set screw (4). Turning the
set screw (4) clockwise will increase the
pressure, and turning it counterclock-
wise will reduce the pressure.
Oil temperature
at the burner
Loop feeder
pipe pressure
125 °C
3,0 bar
130 °C
3,5 bar
135 °C
4,0 bar
140 °C
4,5 bar
4
2
1
3
Return
Feed
Light oil version
Heavy oil version