Description

Overview

The Air Brake Pressure Protection Valve protects the main circuit by isolating auxiliary systems during a failure, therefore drivers retain safe service-brake pressure. It opens only after reservoir pressure rises to a set level and then, as a result, closes again if pressure drops.

Features

• Haldex pattern pressure protection valve for trailer air systems
• 1/4 NPT inlet and 1/4 NPT outlet to suit common plumbing
• Opens at 75 psi and closes at 70 psi to protect service brakes
• Serviceable design with replaceable filter on the valve top

Specifications and Materials

Part number: AB8522.
Model reference: Haldex 90554107. Function: isolates auxiliary circuits such as air suspension to preserve braking capability. Ports: inlet 1/4 NPT, outlet 1/4 NPT. Set pressures: opening 75 psi minimum, closing 70 psi. Typical mounting: reservoir or manifold with flow arrow aligned to system direction.
For installation orientation and servicing, see the Haldex pressure protection valve 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.
90554107, 070-90554107, 90054001, E4324, 118181, WM778, WM778-A, E-4325, E4325, F4HS2A435DA, 19QE2109, 790331C91, 90054473, 17-7-261, 767653252131, NW90554107, 72807-0005, 12900146, 32755707, A-CF9852-1, RBQ109083, 35708-4401, KN31000, N15759A

Compliance and Safety

Before removal, depressurise the system and cap open ports to keep contaminants out. After installation, perform a soap-and-water leak test, then verify the valve opens at the specified pressure and recloses at 70 psi. Finally, confirm downstream accessories receive air only after system recovery.

Trailer Applications

Use this pressure protection valve on heavy trailer auxiliaries including air suspension and accessory circuits. Consequently, the service-brake reservoir retains pressure if an auxiliary line fails. The 1/4 NPT porting also simplifies retrofits on prime movers, semi-trailers and dollies.

Cross-reference and Suitability

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

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