3 Product description
16 10014218/00 EN
The flow of oil from the conservator to the tank must be stopped to prevent a
critical loss of oil. This abnormal state is signaled via reed-type switches.
3.2.1 Main valve function
During the normal transformer heating and cooling phases, the main valve is
held open by the float pushing upward without the oil flow in the pipe be-
tween the tank and conservator slowing down.
The main valve only closes in the event of a hydraulic pressure loss that is
greater than the upward force of the float.
The oil flowing through the device is associated with a hy-
draulic pressure loss that depends on the following:
- Oil viscosity
- Oil flow rate depending on the cooling conditions
- Oil flow rate that depends on briefly occurring events such as
the startup of pumps, the elasticity of the tank or of the cooler,
etc.
In the event of an error that causes a flow rate of >>30dm
3
/min, the main
valve closes and an electrical signal is sent via the reed switch.
3.3 Design
The device is suitable for installation in the nominal DN50, DN80 or DN100
pipe diameters.
The connecting flanges on the device can have 4 or 8 drill holes (see "Draw-
ings" chapter for available versions).
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