Description
KN30100 – EMERGENCY RELAY VALVE (AIR HYDRAULIC)
PART NUMBER(S):
Fleet Products: KN30100-G | OE: KN30100, N4301A
DESCRIPTION:
Model: Emergency Relay Valve – Air Hydraulic
Vehicles: Pre-121 trailers, converter dollies, exempt trailer configurations
• Function: Emergency relay valve with automatic bleed down for pre-121 or exempt trailer applications
• System: Air hydraulic systems only (not for spring brake control)
• Service Inlet: 1/4" NPT
• Emergency Inlet: 1/4" NPT
• Delivery Ports: 4 × 1/4" NPT
• Reservoir Port: 3/4" NPT (auxiliary reservoir port plugged, drilled and tapped for air hydraulic)
• Crack Pressure: 3.0 PSI (new)
• Mounting: Standard; bracket may or may not be included
• Cover: Rotatable without performance/warranty impact
• Weight: Approx. 3 lbs
• OEM Part Number: N4301A
Applications:
Designed specifically for air hydraulic systems on pre-121 trailers, converter dollies, and exempt trailers. Provides emergency relay control with automatic bleed-down functionality. Not suitable for spring brake actuation. Ideal in legacy fleet or specialty trailer operations using non-FMVSS 121 configurations.
CROSS-REFERENCE(S):
KN30100, KN30100-G, KN30100X, AA1004AA, 530780, 3217-KN30100, MD KN30100, 279952, 279952-G, 279952X, 279952RX, 279952B1, 279952R, ZZ279952, E-BN279952X, 0R279952, A103600, A103600X, A85490, A86477, A97600, 280856N, 51444, 279180, 279180X, 279730, 279730X, 34021, 65104, 102626, 110139, 110415, 110450, 110600, 177141, 401132, 9006449, 936001005, 7926000493, 279952N, 279952RX, D2X2654, K110415, M1567183, S-A147, S-17740, SA147, WA279952, RG4, RS2, BA147GRP, RL3518ED03, VTC-147A, TKL279952, BW279952N, BDX279952, BEN279952, BW 279952, WM147P, WM147P-G, 111542
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:
✔ For use in air hydraulic systems only – do not use to control spring brakes
✔ Includes automatic bleed-down functionality for system pressure control
✔ Auxiliary reservoir port (3/8"-18) drilled and tapped on valve bottom
✔ Cover may be rotated without affecting function or warranty
✔ Confirm port sizing (all 1/4" NPT except 3/4" reservoir) prior to installation
✔ Bracket may or may not be included; verify with supplier
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Warranty Information
