279000-G | Tractor Protection Valve (TPV3 Style)

TRACTOR PROTECTION VALVE – 279000-G

PART NUMBER(S):

Fleet Products: 279000-G | OE: 279000, 288906C91 | Automann: 5396-279000

DESCRIPTION:

Model: Tractor Protection Valve (TPV3, 3-Port)
Vehicles: Universal fitment for heavy-duty tractor air brake systems
• Valve Type: Two-line non-automatic tractor protection valve
• Mounting Location: Rear of tractor cab
• Function: Isolates and protects tractor air system from trailer failure or breakaway
• System Compliance: FMVSS-121 compliant
• Actuation: Pneumatic – spring and diaphragm based
• Port Configuration:
 – Tractor Service: 3/8" NPT
 – Tractor Emergency: 1/4" NPT
 – Trailer Service: 1/2" NPT
 – Trailer Emergency: 1/2" NPT
• Mounting Style: Bolt-on, 2-hole flange
• Crack Pressure: 45–60 PSI
• Operating Range: 20–45 PSI functional behavior, closes trailer air line when pressure drops
• Weight: ~2.5 lbs
• Material: Heavy-duty composite/aluminum hybrid
• Performance/Technology:
 – Designed to shut off trailer air automatically in case of line rupture
 – Preserves tractor air system integrity in the event of trailer detachment
 – Designed for use with dash-mounted control valves
• System Integrity: OEM-grade construction; replaces older KN34060/KN34060X valves; leak-proof performance when installed correctly

Applications:
This tractor protection valve is a critical safety component in the air brake system of Class 7 and 8 trucks. Mounted at the rear of the cab, it prevents trailer air failure from compromising the tractor's air supply. Ideal for use in multi-trailer fleets, long-haul trucking, and operations requiring FMVSS-compliant air management. Compatible with standard trailer control dash valves.

CROSS-REFERENCE(S):

279000, BNS279000N, BB279000N, E-BN27900, AV279000, 280830, OR279000, KN27900, KN27900X, KN27900-G, KN27900B, KN27900C, KN27900D, KN27900E, KN27900F, KN27900G, KN27900H, KN27900J, KN27900K, KN27900L, KN27900M, KN27900N, KN27900P, KN27900Q, KN27900R, KN27900S, KN27900T, KN27900U, KN27900V, KN27900W, KN27900Y, KN27900Z, MIDKN27900, EMDKN27900X, MID279000, MID279000G, MID279000X, MID279000B, MID279000C, MID279000D, MID279000E, MID279000F, RB-279000, 110747, 110748, 401223, 39300586, 300479EE, 12354, PL-279000, N4304AE, N4304AD, N4304, N4304AG, N4304AK, N4304BA, S8666, JNY0861, EM40752, TPV3, 5396-KN27900, 170.KN27900, WA279000, WAKN27900, 320052, 80-1001, 30905, U55 279000, 08600, S-8932, A279000, AC67930, AF279000, AVA279000, 20-QE-2101, 213-910-R, 288-906-C, 46806

A cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data.

IMPORTANT INSTALLATION NOTES:

✔ Mount valve in upright orientation using 2-bolt flange
✔ Ensure correct threading and tight sealing at all five NPT ports
✔ Follow tractor manufacturer’s routing for service/emergency lines
✔ Verify full cut-off function between 20–45 PSI system loss
✔ Valve must be used with dash-mounted trailer air control valves
✔ Do not install inverted or with ports unsealed
✔ After installation, verify full function by isolating trailer and observing shut-off

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