Tronair 20-4500-7000 Pneumatic Aircraft Oxygen Booster, Up to 2,250 PSI

The 20-4500-7000 utilizes a shop-air-driven pressure amplifier, which requires an input of 80 SCFM at pressures ranging from 145 to 150 PSIG (approximately 90 to 150 PSI, depending on the specification).  This means you’ll need a stable, high-capacity shop compressor or air supply to reliably boost oxygen pressure. Insufficient air supply can prevent the booster from achieving the required output pressure. Always confirm your ground support air system meets or exceeds these requirements before use.

Only oxygen may be used – under no circumstances should other gases be substituted. The booster should not be used on low-pressure aircraft oxygen systems, and input oxygen bottle pressure must not exceed 2,250 PSIG. All components must be clean, dry, and oxygen-clean per industry standard SAE AIR 1176, and servicing must be conducted by trained personnel per SAE ARP 1532. Improper use or contamination can lead to serious hazards.

The booster can deliver an output pressure of up to 2,200 to 2,250 PSI (151.7 to 155 bar). Once the preset pressure is reached, the unit automatically shuts down to prevent overpressurization of the aircraft oxygen system. This automatic shutoff adds an extra layer of safety, protecting both the aircraft system and the booster equipment.

The booster requires a minimum supply bottle pressure of 250 PSI (17 bar) to initiate oxygen boosting. Bottles below this pressure may not yield sufficient flow or pressure to bring the aircraft system up to the required 2,200+ PSI. This helps ensure that only adequately charged bottles are used, reducing the risk of underfilling or incomplete oxygen system servicing.

According to the operation manual, the booster can supply either internal aircraft oxygen systems or portable aircraft oxygen bottles, offering flexibility in oxygen servicing operations. This versatility makes it useful for a wide range of maintenance scenarios – from pressurizing cabin masks to topping off portable oxygen bottles used in medical or emergency kits.

All plumbing, fittings, and hoses are oxygen-cleaned before shipping to meet stringent purity requirements. This pre-cleaning helps avoid contamination from oils, moisture, or debris that could compromise oxygen quality or create fire/explosion risk. Additionally, the inline filter (15-micron nominal) helps remove particulates from shop air before use.

Yes, the booster includes a high-pressure air pilot set at 2,500 PSI and a high-pressure relief valve set at 2,750 PSI. This overpressure relief protects both the booster and the aircraft oxygen system from dangerous pressure spikes. It acts as a fail-safe if pressure regulation malfunctions or if an operator inadvertently exceeds safe pressure limits, thereby enhancing system safety.

Yes. According to Tronair, the booster must not be used on low-pressure aircraft oxygen systems; only oxygen may be used (no other gases). Components must remain clean and oxygen-free (free from oil, moisture, and contamination) as per SAE AIR 1176. Also, the inlet oxygen bottle pressure must not exceed 2,250 PSIG.  These restrictions ensure safe, compliant, and effective oxygen servicing.