Description

Overview

The PR4 pressure protection valve protects heavy vehicle air brake systems by keeping accessory circuits isolated until the primary reservoir reaches a safe pressure level.

Features

• Non adjustable PR4 style pressure protection valve for heavy truck and trailer air systems
• Closes at about 85 psi so brake reservoirs fill first before accessories draw air
• 1/4 NPT supply and delivery ports suit common air brake plumbing layouts
• Compact two port body for straightforward mounting and service

Specifications and Materials

Part number: AB8353.
This PR4 pressure protection valve is normally closed and opens only after system pressure rises above its closing setting, so it limits air loss from the primary brake reservoir. It uses standard 1/4 NPT supply and delivery ports and follows recognised PR-4 style technical attributes. For detailed operation, dimensions and OEM attributes, refer to the PR-4 pressure protection valve 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. RKN31010, 286500, P1000477, 109095, 220222, 220223, 286500X, 21322283, 122635, 550017, 1037152, 28A4123, D5HS2A435AA, P0166400, 36Q509, 2530000626456, 4820004247089, K286500, 900220A, VS5944, 20QE2159R, 745-286903, 223635, G1005578, XG1005578, WA286500, H286500, 1676732C1, 1005578, 7900GX, RH103178, 802642, LPR-5546, S-A273, S-C351, 401181, 1002199, 61180212, 1020358, 20358, ST7420358, 7736012, 034037, BW 286500, 287827, PR-4, D5HA2A435AA, 290548D.

Compliance and Safety

Pressure protection valves are safety critical, therefore installation and testing should be handled by a competent person familiar with heavy vehicle air brake systems. Always drain the air system before removing the old valve, then refit plumbing to match the original layout, torque fittings and after installation check for leaks with a soapy water solution.

Trailer Applications

A PR4 pressure protection valve commonly feeds trailer accessories such as air suspension, auxiliary reservoirs or other non essential circuits while still protecting the primary brake air supply. Consequently, it suits prime movers, rigid trucks and trailers where operators want accessories to shut off automatically if brake system pressure begins to drop.

Cross-reference and Suitability

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

Use this table as a quick reference when matching fleet and OEM catalogues during servicing or parts consolidation.

Why Choose ICS Trailers

ICS Trailers focuses on practical heavy vehicle solutions, so each air valve listing is checked against recognised technical sources before it reaches the catalogue. Additionally, the team understands workshop pressures, therefore products like this PR4 pressure protection valve are chosen to balance reliability, availability and cost for Australian fleets. For more air system components suited to local trailers and trucks, browse the Air Brake Parts category at ICS Trailers