278614-G | Double Check Valve (DC-4 Style)

DOUBLE CHECK VALVE – 278614-G

PART NUMBER(S):

Fleet Products: 278614-G | OE: 278614, KN25061, N20954A | Automann: 170.278614

DESCRIPTION:

Model: DC-4 Type Double Check Valve
Vehicles: Compatible with truck and trailer air brake systems
• Valve Type: Double check valve with 3 ports
• Function: Selects higher-pressure air source from two inputs; prevents backflow
• Inlets: A & B – 3/8"-18 NPT (female)
• Outlet: C – 3/8"-18 NPT (female)
• Air Port Quantity: 3 total
• Thread Type: NPT
• Mounting Hole Diameter: 0.34–0.35"
• Actuation: Pneumatic (shuttle-based pressure balancing)
• Operating Temperature: -40°F to +200°F (-40°C to +93°C)
• Mounting Orientation: Must be mounted horizontally as shown
• Material: OEM-grade cast body
• Weight: ~0.67 lbs
• Unique Features:
 – Automatically selects higher-pressure source
 – OEM-grade shuttle for durability and precision
 – Compatible with most competitive models
 – Interchangeable across major OEM systems
 – Compact form factor for universal fit

Applications:
Designed for use in heavy-duty truck and trailer air brake systems requiring selection between two independent pressure sources. The 278614-G (DC-4 type) valve provides seamless backflow protection and automatic pressure balancing, making it ideal for parking/emergency circuits or dual tank configurations.

CROSS-REFERENCE(S):

278614, RB-278614, KN25061, N20954A, 15507-BCV278614, BW278614, 229521

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 3/8"-18 NPT (female)
✔ Mount horizontally only as per OEM specification
✔ Use in dual-source air systems requiring isolation and priority selection
✔ Ensure shuttle moves freely—do not install upside down
✔ Torque fittings using standard NPT practices for leak-free sealing
✔ Interchangeable with most competitive models

WHY CHOOSE FLEET PRODUCTS | KBR - HEAVY DUTY TRUCK & TRAILER PARTS?