Description
WM778A-G PRESSURE PROTECTION VALVE
PART NUMBER(S):
Fleet Products: WM778A-G
OE: WM778A, N15759DB, EM36850, 118181, 20QE2128, KN31001, 70PSI
DESCRIPTION:
Model: Pressure Protection Valve
Vehicles: General truck and trailer air brake systems
• Valve Type: Pressure Protection Valve (Air Brake)
• Operation: Normally closed until system pressure reaches 70 PSI; opens at 75 PSI; recloses automatically if pressure drops below 70 PSI
• Ports: (2) 1/4" NPT
• Max Operating Pressure: 150 PSI
• Operating Temperature Range: -40°F to 180°F (-40°C to 82°C)
• Function: Protects primary air brake system by isolating auxiliary systems to prevent pressure loss
• Compliance: FMVSS 121 compliant
• Application: Used when auxiliary air systems are supplied off a primary air system to safeguard primary brake pressure integrity
• Includes: Valve only, no inline filter specified
Applications:
Designed for heavy-duty truck and trailer air brake systems requiring protection of the primary system from auxiliary line failure or pressure loss. Automatically controls air flow to maintain system integrity.
CROSS-REFERENCE(S):
WM778A, WM778A-G, 118181, 118365, WIL118181, ZDA118181, KN31000, KN31001, N15759DB, EM36850, 20QE2128, TCT-WM778A, 827030152925, WIM118181, WM-778-A, 70PSI, 118365
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:
✔ Install inline using (2) 1/4" NPT ports
✔ Position in auxiliary or primary air system as specified
✔ Verify system pressure ratings before installation
✔ No inline filter included unless otherwise specified
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