Application

The 4286, 4289, and 4291 series inertrol outfits are three stage nitrogen regulators especially designed to maintain oilfilled transformer atmospheres at 0.5 PSIG. Each inertrol outfit consists of a two-stage regulator connected in series to a highly sensitive single-stage regulator which maintains the 0.5 PSIG pressure. A built-in pressure relief valve in the third stage regulator helps protect against over-pressurization of the system. These inertrol units are designed for oil-filled transformers manufactured by ABB, Inc., General Electric, and Cooper Power. Some outfits are equipped with an alarm switch that activates a customer equipped warning device should the cylinder pressure drop below 300 PSIG.

Features

• Heavy duty brass and aluminum construction resists corrosion and provides for longer life.
• The 4289 series incorporates a special by-pass valve to allow for quick filling of the transformer.
• Hidden pressure adjusting screw helps protect against tampering by unauthorized personnel.
• Large diameter diaphragm in the third-stage regulator provides for sensitive and precise control of the gas flow.
• Maximum inlet pressure - 3000 PSIG.

Materials

Two-Stage Regulator:

Body ................................Brass
Bonnet .............................Brass
Diaphragms ......Synthetic Rubber
1st Stage Seat Disc ..........Nylon
2nd Stage Seat Disc ....Neoprene

Third-Stage Regulator:

Body ..................................Zinc
Bonnet ...............................Zinc
Diaphragm .....................Buna N
Seat Disc ......................Buna N

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