Description
278598-G – DOUBLE CHECK VALVE (4)
PART NUMBER(S):
Fleet Products: 278598-G | OE: 278598, N20966F | Automann: 170.278598
DESCRIPTION:
Model: Double Check Valve – DC-4 Style
Vehicles: Suitable for general truck and trailer air brake systems
• Inlet A: 3/8" NPT (female)
• Inlet B: 3/8" NPT (female)
• Outlet C: 3/8" NPT (female)
• Outlet D: 3/8" NPT (female)
• Valve Function: Permits two independent air sources to control a single delivery; only the higher pressure source transmits air
• Mounting Style: Horizontal mounting only (as pictured)
• Thread Type: NPT
• Valve Type: DC-4 standard
• Construction: Compact metal body with shuttle mechanism
• OEM Part Number: N20966F
• System Compatibility: Interchangeable with most competitive models
• Design Feature: Movable internal shuttle to seal off the lower-pressure input
Applications:
Used where dual pressure sources must control one outlet, such as service lines on truck/trailer air brake systems. Common in redundancy setups and automatic emergency brake overrides.
CROSS-REFERENCE(S):
278598, 278598-G, KN25110+AR357, 278598N, BEN278598, BNW278598N, BW278598, FS278598X, DC-4, 170.278598, KN25110, RKN25100, 278598BXW, 278598X, B16920GRP, S-16920, S16920, BER-278598, E-BN278598, BX278598, BW 278598N, TV278598, 181-153-R, 181153R, 181153R2, 2257FX1, 3918388, 745-278598, 745278598N, A7X4056, 72404-5002, 78208-0001, 72404-0008, 514019
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:
✔ Must be installed horizontally as pictured for proper shuttle operation
✔ Do not mount vertically – risk of internal shuttle misalignment
✔ Ensure correct routing from two pressure sources to avoid backfeed
✔ Confirm compatibility if replacing valves controlling spring brake functions
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Warranty Information
