Bendix Brakes 277971N PR-2 Pressure Protection Valve

The Bendix 277971N is a PR-2 Pressure Protection Valve designed for commercial vehicle air brake systems. This normally closed, pressure-sensitive control valve is commonly used to isolate one reservoir from another by closing automatically at a preset pressure, ensuring adequate air pressure is maintained for critical braking functions.

Key Features:

• Pressure-sensitive automatic operation protects primary air supply
• Normally closed design prevents air flow until sufficient pressure builds
• 1/4-18 NPT supply and delivery ports for standard installation
• Two-hole mounting configuration with Ø .271 inch mounting holes
• Maximum operating temperature of 200°F (93°C)
• Manufactured by Bendix Commercial Vehicle Systems, a trusted name in heavy-duty braking components

This valve is ideal for heavy-duty trucks, buses, tractors, and trailers equipped with air brake systems. The PR-2 valve automatically opens to allow air flow to accessories or secondary systems once the supply pressure reaches the specified threshold, then closes to protect the primary system if pressure drops.