3202122-1 — 9” Check Valve Repair & Overhaul

Component Overview

A 9-inch check valve is a large-diameter, passive one-way valve in the pneumatic and air management system that allows airflow in a single direction through major bleed or distribution ducting while blocking reverse flow, preventing cross-bleed and protecting upstream sources during reverse-pressure conditions. Forward pressure unseats a flapper or split-disc element, and reverse pressure plus spring force reseats it to seal the line. Its large size and continuous exposure to hot, pulsating, high-volume airflow make it prone to seat and flapper wear or erosion causing reverse leakage, hinge-pin and bushing wear, spring fatigue altering reseat behavior, corrosion and contamination causing sticking, and fretting of sealing faces. These conditions drive leak and functional testing, seat and hinge repair, spring replacement, and overhaul.

Aircraft Application

Part number 3202122-1 (9” Check Valve) is installed on the Boeing 767. QTC supports operators and MROs servicing this platform with certified repair and overhaul.

Our Repair Capability

QTC repairs and overhauls 3202122-1 to the original manufacturer's specifications under our FAA and EASA Part 145 approvals. Our team — including former OEM pneumatic & air management engineers — performs teardown, inspection, cleaning, component replacement, functional testing, and certification, returning a serviceable unit with the appropriate airworthiness release. We also develop repairs for rejected and beyond-economic-repair (BER) hardware.

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Frequently Asked Questions