Product Description
GOVERNOR VALVE – D2 STYLE, ADJUSTABLE 95–120 PSI RANGE
PART NUMBER(S):
Fleet Products: 284358, 284358-G | OE: 284358, 275491, N30190CA | Automann: 170.284358
DESCRIPTION:
Model: D2 Air Brake Compressor Governor Valve
Vehicles: Universal fit for heavy-duty truck and trailer air brake systems
• Valve Type: D2-style pneumatic compressor governor
• Function: Automatically controls cut-in and cut-out air pressures in brake system
• Actuation: Pneumatic, pressure-operated, normally closed
• Cut-In Pressure: 95 PSI nominal
• Cut-Out Pressure: 120 PSI nominal (adjustable up to 125 PSI)
• Pressure Differential Range: 15–30 PSI above cut-in (not adjustable)
• Adjustment: External screw (1/4 turn ≈ 4 PSI change)
• Port Configuration:
– (3) Reservoir Ports: 1/8"-27 NPT
– (3) Unloader Ports: 1/8"-27 NPT
– (1) Exhaust Port: 1/8"-27 NPT
• Mounting: Direct to compressor or remote (2 holes, 0.336" diameter)
• Construction: Metal body with non-metallic or metallic piston
• Temperature Range: –40°F (–40°C) to 250°F (121°C)
• Weight: ~0.5 lbs (Includes: Gasket and 4 pipe plugs)
• Features:
– High-temperature o-rings and waterproof cover
– Adjustable cut-in/cut-out pressures
– Reliable direct or remote mounting options
– Meets OEM standards for durability and consistency
Applications:
Used across a wide range of heavy-duty vehicles to regulate air compressor performance within a predefined pressure band. Ensures consistent brake system air pressure by signaling the compressor to load or unload. Ideal for use in high-temperature and endurance-demanding air brake environments. Suitable for direct or remote mounting configurations.
CROSS-REFERENCE(S):
284358, 284358-G, 284358N, 284358NP, 284358R, 284358X, 275491, 275491X, 276049, 282436, 101474, 102178, 102178X, 108818, 109662, 109662N, 120PSI, 18537, 227435, 284358N, 284358X, BH284358, OR284358X, BXW284358, W:BW-284358N, BEN284358, WH284358, KN18500, KN18500X, KN18530, KN18530M1D, KN18534, KN18537, KN-18534, R955284358N, VHD18537, WA284358, E-BN284358, E-BN284358X, E-BN284358N, TWDH284358, TV284358, TV284358TEC, 34083, 034083, 4L-8-1, FLTBV358, G8602-C, VTC-535A, BA535GRP, AV284358, 637209190, 20QE275P4, 664-760-C, N30190CA, 284358G0V, 401237
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:
✔ All ports are 1/8"-27 NPT; use proper sealing compound
✔ Mount directly to compressor or remotely using two 0.336" holes
✔ Adjust pressure setting using external screw (1/4 turn ≈ 4 PSI)
✔ Use included gasket and pipe plugs where applicable
✔ Confirm system operating range matches cut-in/cut-out specs
✔ Avoid excessive adjustment — cut-in/cut-out range differential is fixed
✔ Check system for leakage using soapy water at exhaust and cover
SOLD AS NEW
Brand new and ready to install, with OEM Grade Reliability
SUPPORT & ORDERING
For technical support, installation guidance, or to confirm fitment, Call: 1-877-243-0442 | Email: sales@fleet-products.com
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