16391 - Miller Smith 3-Stage Low Pressure Nitrogen Regulator for Transformers

Protect Your Transformers with Miller Smith Reliability

When it comes to maintaining oil-filled power transformers, there is no room for error. The Miller Smith 16391 Nitrogen Blanketing Regulator is the industry standard for ensuring your substation equipment remains protected against moisture and oxidation. Designed to deliver a constant, ultra-low pressure of nitrogen, this regulator creates a protective shield over the transformer oil, extending the life of your expensive electrical infrastructure.

Why Choose a 3-Stage Regulator?

Standard welding regulators struggle to maintain accuracy at pressures below 1 or 2 PSI. The Miller Smith 16391 solves this by using a unique three-stage reduction system. By stepping down the pressure in three distinct phases, it achieves a stable output of 0.5 PSIG regardless of the cylinder pressure. This ensures that your transformer always has positive pressure to keep contaminants out, without the risk of over-pressurizing the tank seals.

Built for the Field

Field technicians appreciate the thoughtful design features that make the 16391 easy to use and reliable in all weather conditions:

• Rapid Fill Mode: A dedicated bypass valve allows you to fill the transformer headspace quickly at 6 PSIG, saving valuable time during commissioning.
• Automatic Relief: The integrated 8 PSIG relief valve acts as a fail-safe, venting excess pressure caused by temperature spikes (like a hot summer day) so you don't have to worry about tank damage.
• Tamper-Resistant: Once set, the pressure adjustment screws are hidden, preventing accidental changes or unauthorized tampering.

Durable Materials

Invest in equipment that lasts. The 16391 features a corrosion-resistant body made of brass, aluminum, and plated zinc, topped with a nickel-plated bonnet. The internal neoprene composite diaphragm is engineered for high sensitivity and long service life, ensuring that this regulator will perform year after year in outdoor substation environments. Compatible with standard Nitrogen cylinders via a CGA 580 connection.