Description
278825-G – SYNCHRO VALVE (1)
PART NUMBER(S):
Fleet Products: 278825-G, 278825
OE: 278825, 278825BXW, 278825N
Automann: 170.278825
DESCRIPTION:
Model: SV-1 Synchro Valve
Vehicles: Suitable for trucks, trailers, tractors, buses, and converter dollies using synchronized pneumatic control systems
• Valve Type: Non-graduating, air signal-operated on-off control valve
• Function: Controls the sequence or delay of other air brake components by remote actuation
• Actuation: Pneumatically operated via control port signal
• Port Sizes:
– Supply: 1/4"-18 NPT
– Delivery: 1/4"-18 NPT
– Control: 1/4"-18 NPT
– Exhaust: 1/8"-27 NPT
• Pressure Activation:
– Inlet Opens: 42 PSI
– Exhaust Opens: 28 PSI
– Inlet Opens (constant supply): 53 PSI
• Mounting:
– Hole Diameter: 0.28" (2 holes)
• Operating Temperature: -40°F to +200°F (-40°C to +93°C)
• Thread Type: NPT
• Body Dimensions: Approx. 3" H × 3" W
• Weight: 0.67 lbs (approx. 305g)
• Unique Features:
– Sequences or delays pneumatic actuation
– Can operate as automatic controller when supply/control ports are shared
– Non-graduating behavior for consistent timing and logic-based control
– Complies with FMVSS 121 standards
Applications:
Used in commercial vehicle air brake systems to synchronize pneumatic components such as spring brakes, relay valves, or trailer service valves. Enables delayed or staged actuation for optimized brake sequencing in dual-circuit or auxiliary systems. Effective in harsh environments with precision control demands.
CROSS-REFERENCE(S):
278825, 278825BXW, 278825N, 278825P, 278825X, 280353, BEN-278825, BEN-278825N, BEN278825, BW278825, BW 278825N, BW280353, BX278825, BX280353, FLT FS278825N, R955278825, R955278825N, R955278825X, TDAR955278825N, 20-QE-2102, 745-278825N, 3076-278825, 3949404, 5549, 55490, EM55490, LSV-5549, 170.278825, 745278825N, AV278825, 14559, TV278825, BER-278825, S-17744, S17744, E-BN278825X, EBN278825X, TR278825, ACA-44771700, SM-6947, VTC-77441, 4900010, 49000100, 937021, 4S6776, 2952284, 915A27149, C4TA2B139A, C5TZ2B139A, 825495, ACE48281, 10130463, 2858514, 3858514, S1826, 76042419, 36Z568, 4820004363029, D91143, TWDH278825, H278825, 769434C91, ZAC278825, 670-S17744, 1473650, 24903FX, 295101, TV278825TEC, VP1804, 18446, TLA278825, 13221E7696, 1021045, 25AC01740, 27108371, 8068115, 3060528A cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data.
IMPORTANT INSTALLATION NOTES:
✔ Ensure proper orientation of control, supply, and delivery ports during installation
✔ Verify thread compatibility and torque to OEM specifications (not provided in documentation)
✔ May be used as sequencer or logic control in complex pneumatic systems
✔ Mounting requires two holes of 0.28" diameter
✔ Complies with FMVSS 121 system integration standards
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Warranty Information
