Description

Overview

The pressure protection valve 65psi with one way check is designed to protect trailer air brake reservoirs and accessories from pressure loss if an auxiliary circuit fails. It isolates non-essential circuits until system pressure reaches the set opening point, so core braking performance is maintained.

Features

• One way check function to prevent reverse flow from protected reservoirs
• Nominal 65psi opening pressure suited to common trailer air systems
• 1/2″ NPT outlet and 1/4″ NPT inlet for straightforward plumbing
• Compact body suited to tight manifold and chassis mount locations

Specifications and Materials

This pressure protection valve 65psi uses a one way check arrangement so airflow is allowed in the supply direction only once cracking pressure is reached. It is intended for use in compressed air brake systems where accessory loads must be isolated until main reservoirs are safely charged.

Operating pressure: 65psi nominal opening set point.

Male outlet port: 1/2″ NPT.

Female inlet port: 1/4″ NPT.

Suits Haldex Midland style applications that use this general configuration.

Part number: AB8470.

For more background on how pressure protection valves function in air brake circuits, refer to this manufacturer technical guide manufacturer technical 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. 90555409, N15902B, N15902D, N15902A, N15902C, KN31171, 070-KN31171, ABKN31170

Compliance and Safety

This pressure protection valve 65psi should only be installed in clean, dry air circuits that meet relevant heavy vehicle standards. Always depressurise the system fully before removal or installation, then verify there are no leaks at any port after fitment. In addition, confirm cracking and closing behaviour during brake system checks so the valve operates within the intended pressure range.

Trailer Applications

Typical uses include protecting trailer accessory circuits such as suspension controls, auxiliary valves, and other non-essential loads. In many trailer builds this style of valve is placed between main service reservoirs and downstream equipment, so non-critical functions shut down first if pressure drops. Consequently, the core service and park brake circuits remain prioritised for safety.

Cross-reference and Suitability

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

Always compare port sizes, mounting layout, and operating pressure before final selection so the replacement behaves the same as the original component in the circuit.

Why Choose ICS Trailers

ICS Trailers focuses on practical, field-tested braking components that match heavy trailer requirements. Each valve is selected for dependable performance in Australian conditions, and our team understands typical fleet plumbing layouts, so you can match parts with confidence. For more related components, browse Air Brake Parts at ICS Trailers via Air Brake Parts