16347-3 - Smith 3-Stage Nitrogen Blanketing Regulator with Low Pressure Switch

Precision Nitrogen Control for Power Infrastructure

The Smith 16347-3 Three-Stage Nitrogen Blanketing Regulator is a specialized instrument engineered to protect oil-filled power transformers from oxidation and moisture ingress. Maintaining a positive nitrogen pressure in the headspace of a transformer is critical for extending the life of the insulation system and preventing catastrophic failures. This regulator is specifically calibrated to deliver a consistent, low-pressure supply of nitrogen at exactly 0.5 PSIG. Unlike standard single or dual-stage regulators, the 16347-3 utilizes a unique three-stage reduction mechanism. This design consists of a two-stage preset regulator feeding into a highly sensitive single-stage final regulator, ensuring that the outlet pressure remains stable regardless of fluctuations in the supply cylinder pressure.

Operational safety and reliability are paramount in substation environments. The Smith 16347-3 is equipped with an integrated electronic pressure switch, adjustable between 70 and 300 PSIG. This switch serves as a vital monitoring tool, capable of triggering a remote alarm if the nitrogen supply cylinder pressure drops below the set threshold, alerting maintenance personnel before the gas supply is exhausted. Furthermore, the unit features a built-in self-relieving valve set at 8 PSIG. This safety mechanism automatically vents excess pressure caused by thermal expansion within the transformer, protecting the tank from structural damage due to over-pressurization.

Designed for efficiency during maintenance operations, the regulator includes a separate purge valve connected to the second stage. This rapid-fill bypass allows operators to pressurize the transformer headspace quickly at 6 PSIG, significantly reducing downtime during initial filling or purging procedures. Constructed from durable brass, aluminum, and plated zinc, the housing is built to withstand harsh outdoor elements common in electrical substations. The adjusting screws are concealed to prevent unauthorized tampering, ensuring the factory-set precision is maintained throughout the device's service life.