Description
280809 DOUBLE CHECK VALVE – 3/8" NPT, HORIZONTAL MOUNT
PART NUMBER(S):
Fleet Products: K280809
OE: 280809, KN25110, BHV280809, BNS280809N
Automann: 287626, 287627
DESCRIPTION:
Model: Double Check Valve, 4-Port, Horizontal Mount
Vehicles: Universal fitment for heavy-duty trucks, trailers, and buses with 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)
• Function: Selects the higher of two air pressure sources and directs flow to a single output; prevents backflow
• Operation: Internal shuttle valve actuates based on pressure differential
• Port Configuration: 2 inlets, 2 outlets, all 3/8"-18 NPT
• Material: Die-cast zinc body for durability and corrosion resistance
• Temperature Range: -40°F to +200°F (-40°C to +93°C)
• Mounting: Must be installed horizontally to ensure correct shuttle operation
• Weight: 2.00 lbs
• Dimensions: Height – 8.00", Length – 12.00", Width – 10.00"
• Unique Features:
– Internal shuttle disc isolates lower pressure source
– OEM-grade direct replacement
– No thread sealant required
– Integrated exhaust protection and inlet filtration
• System Fitment: Designed for pneumatic air brake control systems where two independent sources (e.g., service and emergency circuits) must feed a single function
Applications:
This double check valve is used in commercial vehicle brake and air systems where air delivery must come from whichever pressure source is higher at a given time. Ideal for use in dual-source service brake circuits, trailer emergency lines, or auxiliary control systems. Interchangeable with most OE and aftermarket models including use on trucks from Mack, Volvo, and Navistar.
CROSS-REFERENCE(S):
280809, BHV280809, BNS280809N, KN25110, KN25110N, 287626, 287627, 280809N, 280809BXW, DC4, DC-4, R955280809N, K295-141, K295141, K029547, 422950C91, AV278597, AV280809, S-16922, S16922, 9D0338, 25002200164, 802127, TV280809, TLA280809, 3081430, 724040002, 744040002, 745280809, 745-280809, ZAC280809, BAN280809, 116386, SF05963978, SF5963978, 2530004830834, 03902814, 3902814, RKN25110, 109227, 280809BXW, BW109227, BW280809, BW287626, BX109227, BX280809, BX287626, BX287627, E-BN280809N, BER-280809, K280809, 5963978, B16922GRP, US31-1113, TR280809, 4071, EM40710, LCV-4071, 14566, AM170280809, 170280809, BEN-280809, BEN-280809NA 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 horizontally to allow correct operation of internal shuttle disc
✔ Do not apply thread sealant unless explicitly required by system manufacturer
✔ Confirm pressure sources do not exceed rated 200°F / 130 PSI
✔ Test operation after installation by supplying air from each input side individually
✔ Replace if any sign of internal sticking or backflow occurs
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