Description
PRESSURE REDUCING VALVE (PR-2)
PART NUMBER(S):
Fleet Products: 277148-G
OE: 277148, 277148N, 14549
Automann: 170.277148
DESCRIPTION:
Model: PR-2 Adjustable Pressure Protection Valve – 85 PSI
Vehicles: Universal fitment for heavy-duty truck and trailer air brake systems
• Valve Type: PR-2 pressure protection valve (normally closed)
• Function: Protects air brake reservoirs by isolating secondary tanks until system pressure reaches 85 PSI
• Nominal Closing Pressure: 85 PSI ± 5 PSI (adjustable)
• Supply Port: 1/4"-18 NPT
• Delivery Port: 1/4"-18 NPT
• Temperature Range: -40°F to 200°F (-40°C to 93°C)
• Mounting: Two 0.271" holes
• Material: High-strength corrosion-resistant housing
• With Delivery Check Valve: No
• Installation Position: Inline between primary and secondary air reservoirs
• Performance: Delays filling secondary tanks to ensure system safety and balance during startup
• Compliance: OE-spec performance for air system integrity
Applications:
Designed for use in commercial vehicle air brake systems to ensure controlled pressurization. Common in dual reservoir setups to protect air system integrity. Typically used on trucks, trailers, buses, and vocational vehicles requiring reservoir fill sequencing and air pressure protection.
CROSS-REFERENCE(S):
277148, 277148BXR, 277148N, 277148P, 277148RX, BEN-277148, BW277148, BX277148, OR277148X, E-BN277148N, 745-277148N, 4K-22-4, M4X-7499, 14549, 1612-393-C, BAN277148, BAR277148, ZAC277148, BD822GRP, R955277148N, R955277148X, TDAR955277148, S-D822, SD822, TV277148, 401287, WA277148, 2951172, A2231383, 728073401, 872256A, 350173, 1034763, 2067142, 25053400002, DOHZ2A435A, D0HZ2A435A, K2951172, K295-117-2, AE763404, 763404, 36Z1144D1, KN31010, MBW277148, 1231, 11383, 3052964, 34628, 34675, 7926000487, 9234287, 10130563, 101232004, E4039616, 1520900, 283933, 283489, 283038, 49900037A1, 060-277148N, 2Z5113, 4L-22-256, 4L22256, 13AV4421, 25AB0137A, 25AB2137A, VTC-822D, P7602-D, BER-277148A 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 using two 0.271" holes on the valve body
✔ Ensure proper orientation to support reservoir sequencing
✔ Confirm closing pressure is set to 85 PSI ± 5 PSI
✔ Avoid overtightening NPT threads—use approved sealant
✔ Designed for dry, filtered air systems only
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