Description

Overview

The Midland pressure protection valve 65 psi protects the primary air reservoir from accessory failure so trailer braking remains available. It opens once reservoir pressure reaches a set point and then closes if downstream circuits drop too low, which helps stabilise system pressure during faults.

Features

Firstly, this pressure protection valve charges accessory circuits only after the main reservoir reaches roughly 65 psi, so braking air is prioritised. Additionally, it recloses around 55 psi to isolate leaking circuits, while the compact top hat body with 1/4″ NPT ports allows straightforward plumbing into existing air lines.

Specifications and Materials

This valve suits Midland style KN31000 applications that use 1/4″ NPT inlet and outlet ports. Operating pressures are typically 65 psi opening and 55 psi closing, which matches many heavy trailer accessory protection layouts. Part number: AB8460.

For further background on how pressure protection valves work in air brake systems, refer to this manufacturer technical guide for pressure protection valves

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. 356596C91, N15759, N15759A, N15759DC, N15759L, 378414, E4799, 9348990040, 032086, 32086, 118181, WM778A, 9348990010, 9348990150, EBN277227X, EBN288323X, RKN31000X, 277146, 277147, 277226, 277227, 277971, 279505, 281467, 282517, 285537, 285541, 288323, 2024008, 80801, L13530, L33659, XL22700, 346222, 34695, C6TA2A435A, ACE59442A, ACE59442B, AXA0253, 2010747, 2430717, 2490710, 3876271, 657033, 694298, 9019718, X79186, 76022841, 20QE2128, 20QE1326, 20QE2101, 20QE2101P1, 20QE2109, 20QE3321, 745277226, 265743C91, 273027C91, 503511C91, 790331C91, 9054107, K2951171, K295197, 08-02415, SC089, 110257, 140300, 140370, 140380, 1002155, 9034280, 17746, 38183, 3107966, 4000206, 72807-3801, 12990, 12996, WM778, N15759E, KN31011, KN31000

Compliance and Safety

In service, the Midland pressure protection valve 65 psi supports typical heavy vehicle design practice by feeding accessories only after the service brake reservoir is charged. Consequently, it can improve safety when suspension controls or other auxiliary loads develop leaks, provided technicians follow standard lockout and depressurising procedures during maintenance.

Trailer Applications

This pressure protection valve suits a wide range of truck and trailer air brake systems that specify Midland KN31000 style valves. In addition, it is commonly used to protect suspension controls, air-operated accessories and similar circuits that should drop out before primary and secondary braking circuits.

Cross-reference and Suitability

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

Why Choose ICS Trailers

ICS Trailers focuses on practical, road-tested air brake parts so you can source components that work reliably in Australian transport conditions. Furthermore, our team understands how the Midland pressure protection valve 65 psi fits into common trailer layouts, which helps you match replacements correctly and reduce repeat workshop visits.

Browse Air Brake Parts at ICS Trailers