Description

Overview

The Tractor Protection Valve Two Line safeguards the tractor’s air system and manages service and emergency connections to the trailer. It uses a built-in quick release feature to purge air rapidly, therefore brake circuits reset faster and operators gain consistent response in daily work.

Features

• Two line non-automatic tractor protection valve with integral quick release
• Prevents trailer brake compounding to protect components
• Standard NPT ports for straightforward plumbing on heavy trailers
• Direct replacement pattern that suits common mounting layouts

Specifications and Materials

Part number: AB8317.
Ports: tractor service 3/8 NPT, tractor emergency 1/4 NPT, trailer service 1/2 NPT, trailer emergency 1/2 NPT. Function: isolates trailer during a failure and vents locally for faster release. Typical mount: crossmember or panel near service and emergency lines.
For installation and changeover instructions specific to this valve family, refer to the Haldex KN34060/KN34061 manufacturer installation guide.

Compatibility and Fitment

This cross-reference listing means this valve is a suitable replacement for the part numbers and applications shown. Some changes in air line plumbing may be required.
KN34060, N20949CA

Compliance and Safety

Depressurise both tractor and trailer circuits before removal. Next, label each hose and cap open ports to keep the system clean. After installation, perform a soap-and-water leak test, then cycle the brakes to verify shut-off and quick release functions operate as intended.

Trailer Applications

Use this tractor protection valve on prime movers that tow semi-trailers, B-doubles and converter dollies. It maintains correct separation between tractor and trailer circuits during faults. Moreover, the standard port sizes simplify retrofits where an older TP valve requires replacement.

Cross-reference and Suitability

This part cross-references to or suits the following equivalent part numbers and compatible alternatives:

Why Choose ICS Trailers

We verify specifications against manufacturer data and focus on reliable, fleet-ready parts. Consequently, installers complete the job efficiently and equipment returns to service sooner.
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