Description

Overview

This air brake quick release valve with two way check suits QR-1C style spring brake circuits on heavy trailers. It sits close to the spring brake actuators so it can dump chamber pressure quickly when you apply or release the park control. As a result, the valve helps your trailer spring brakes apply cleanly and avoids unwanted compounding between service and park circuits.

Features

• This air brake quick release valve with two way check combines a QR-1C style quick release body with an internal double check function for compact plumbing.
• 0 psi crack pressure lets the valve follow control pressure closely so spring brakes respond quickly and consistently.
• 1/4″ NPT supply and balance ports with twin 3/8″ NPT delivery ports match common heavy trailer air brake layouts.
• A protected 3/8″ NPT exhaust port helps direct discharge away from road spray and debris, which supports reliable long term operation.

Specifications and Materials

This QR-1C type valve uses a 1/4″ NPT supply port, two 3/8″ NPT delivery ports, a 1/4″ NPT balance port and a 3/8″ NPT exhaust port. The design suits typical heavy trailer spring brake circuits that need fast exhaust and two way check control between dual service circuits.

Crack pressure is nominally 0 psi so control and delivery pressures remain closely matched within normal service tolerances.

Part number: AB8473P.

For more technical detail on QR-1C style quick release and two way check valves, refer to the manufacturer technical guide which explains operation, internal components and service recommendations for this valve family.

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. 289714, 109094, 289182, KN32040, KN32041.

Compliance and Safety

Always park on level ground, chock the wheels and drain all air reservoirs before you remove or install any air brake valve. After installation, recharge the system and perform soap tests at the supply, balance, delivery and exhaust ports to confirm there are no leaks. If you see heavy corrosion, cracked housings or blocked exhaust ports during inspection, replace the valve instead of trying to repair it.

Trailer Applications

Workshops typically mount this air brake quick release valve with two way check on the axle or chassis between paired spring brake chambers. This position keeps the exhaust path short so the valve can dump air quickly from both chambers. It suits semi-trailers, dog trailers and rigid vehicles that use QR-1C pattern emergency spring brake circuits, however you should confirm the circuit layout with a brake specialist before you change any valve style.

Cross-reference and Suitability

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

Use these numbers as a guide only and verify full system requirements, including local regulations, with a qualified brake technician before final selection.

Why Choose ICS Trailers

ICS Trailers focuses on heavy trailer parts so you get components chosen for real fleet conditions, not light duty automotive use. Our team checks specifications carefully, consequently you can match ports, functions and cross references with confidence. We back this with clear product data so workshops can identify the correct air brake quick release valve with two way check quickly and keep downtime low.

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