HVS positive pressure Inert Air Systems are
designed to protect transformer oil in the main tank
from oxidation and moisture absorption by keeping tank
pressure at proper preset levels.
Systems utilize a replaceable nitrogen tank and three-stage pressure gauge for low gas supply. Pressure alarms are provided for both low and high tank pressures. By using these preset gauges and valves, our Inert Air Systems maintain transformer tank pressure between 0.2 psi and 5.5 psi. If tank pressure reaches a minimum 0.2 psi, nitrogen gas is sent from the nitrogen supply cylinder through the reducing valve assembly and into the transformer tank. If tank pressure rises above 5.5 psi, a pressure relief valve automatically opens to bleed off excess tank pressure.
Contacts are provided for installation of an alarm system to
signal if gas pressure at the supply cylinder should drop below
200 psi.
A pressure gauge serves as a visual indicator of supply cylinder
pressure. Alarm provisions are also available to signal when
transformer tank pressure exceeds 5.5 psi and when tank pressure
drops below 0.2 psi.
For cabinet specifications and detailed drawings as well as part number configurations on our inert air systems, please contact us at the phone/e-mail address above or download the following brochure (in Adobe Acrobat format):
HVS positive pressure Inert Air Systems are
designed to protect transformer oil in the main tank
from oxidation and moisture absorption by keeping tank
pressure at proper preset levels. 
A pressure gauge serves as a visual indicator of supply cylinder
pressure. Alarm provisions are also available to signal when
transformer tank pressure exceeds 5.5 psi and when tank pressure
drops below 0.2 psi. 
