277147-G | Pressure Reducing Valve (PR-2 Style)

277147-G – PRESSURE REDUCING VALVE (2)

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PART NUMBER(S):
Fleet Products: 277147-G
OE: 277147, 3915330, 20-QE-2101, 11669104, 279505N
Automann: 170.277147

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DESCRIPTION:

Model: PR-2 Pressure Protection Valve
Vehicles: Compatible with air brake-equipped commercial vehicles, including Mack, Volvo, and International applications
• Valve Type: Pressure reducing/protection valve
• Function: Protects brake system by isolating or delaying air supply to accessories or secondary reservoirs until the system reaches safe pressure
• Actuation Type: Pneumatic, normally closed, pressure-sensitive (on/off)
• Mounting: (2) holes, 0.271" diameter, spaced 1.25" center-to-center
• Port Sizes:
 – Supply Port: 1/4"-18 NPT
 – Delivery Port: 1/4"-18 NPT
• Pressure Setting: 65 PSI ± 5 (factory preset, field adjustable)
• Operating Temperature: -40°F to +200°F (-40°C to +93°C)
• Weight: 0.60 lbs
• Material: Die-cast zinc
• Performance: FMVSS 121 compliant
• Unique Features:
 – Adjustable pressure threshold
 – No delivery check valve
 – Designed to delay filling of non-essential components
 – Lock wire ready configuration

Applications:
Used in air brake systems to protect primary air supply from being compromised by accessory failure. Ideal for isolating reservoirs or delaying supply to air-suspended components until 65 PSI system pressure is reached. Commonly mounted between air tanks and auxiliary valves or systems in heavy-duty trucks, trailers, and buses.

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CROSS-REFERENCE(S):

277147, BEN277147, BDX277147, BWN277147N, 745X277147, 277147N, 277147X, 277147BXR, 277147BXW, 277147CX, 2771478, 277177, 279505, 285537, BW277147, BW277147N, BW277177, BW279505, BW285537, BX277147, BX277177, BX279505, BX285537, OR277147X, R955277147N, R955277147X, TDAR95527714, 20-QE-2101, 745-277147N, 1676-715-C, BAN277147, BX277147N, BX277226, BX277226N, NS277147, 5548, 55480, EM55480, LPR-5548, 14548, TV277147, TR277147, 401286, BER-277147, S-D817, SD817, 0587-277147P, 3511351, BD817GRP, E-BN277147N, 170277147, AM170277147, FC277147, 12C-7-16, MPN277147, 060-277147N, 1411318, 846218, 109157, 80801, 289970, 113618, L13530, XL22700, 2M9348, E9228724, 1027907, 6D0918, 9228724, C6TA2A435A, AXA0253X, 76022841, KN31000, 763403, 31A1207, AS30272, 19606FX, 36651, F224672, 4820-114-7543, 48201147543

A cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data.

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IMPORTANT INSTALLATION NOTES:

✔ Mount valve with ports oriented per OEM routing; confirm 1.25" hole spacing
✔ Verify preset pressure before installation if application requires alternate PSI setting
✔ No delivery check valve – install only where reverse pressure is not present
✔ Do not overtighten; use thread sealant rated for pneumatic fittings
✔ No re-torque required post-installation – factory torques are final

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