Description
278597-G – DOUBLE CHECK VALVE (4)
PART NUMBER(S):
Fleet Products: 278597-G | OE: 278597, DC-4, 278597N | Automann: 745-278597
DESCRIPTION:
Model: DC-4 Double Check Valve
Vehicles: Used in heavy-duty truck and trailer air brake systems
• Function: Permits two pressure sources to control a common function; only the higher pressure is routed to the delivery port
• Valve Type: Shuttle-operated pneumatic valve
• Supply Ports: 1 × 3/8" NPT (male) + 1 × 1/4" NPT (female)
• Delivery Ports: Up to 2 × 1/4"-18 NPT (female)
• Operating Temperature: -40°F to 200°F (-40°C to 93°C)
• Mounting: In-line installation recommended in horizontal orientation
• Material: Cast housing; internal shuttle disc for directional control
• Performance: Leak-tested, high-pressure durability; FMVSS-121 compatible system component
Applications:
This double check valve is essential for air brake systems where a single function (e.g., emergency actuation or override) must receive air from the higher of two sources. Commonly used in configurations where multiple air circuits converge—such as trailer supply or emergency override functions in both straight trucks and articulated tractor-trailer assemblies.
CROSS-REFERENCE(S):
278597, 278597N, 278597BXW, DC-4, 278597X, BEN278597, BEN278597N, H278597X, 2463081, KN25080, TV278597, 172412R92, 20QE255P2, 22905, 2R0618, AV278597, BAN278597N, BW 278597N, BX278597N, TWDBEN278597N, 745-278597
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 with shuttle or disc in horizontal orientation for optimal performance
✔ Inspect supply and delivery ports for thread damage before installation
✔ Use appropriate thread sealant on all NPT ports to prevent leakage
✔ Ensure compatibility with system pressure and operating range
✔ Periodically inspect for obstruction or contamination affecting shuttle movement
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Warranty Information
