Description

Overview

Pressure protection valve 70psi provides controlled reservoir isolation in trailer air brake systems, helping prevent accessory failures from draining critical air supply. Additionally, this compact valve suits heavy vehicle trailers that need reliable closing pressure before feeding air to downstream accessories.

Features

• Closes at approximately 70psi to secure reservoir pressure before supplying air to auxiliary circuits.
• 3/8 NPT inlet and outlet ports simplify plumbing into common trailer air brake line sizes.
• Integrated pressure protection function helps isolate failed accessories so primary service braking remains available.
• Compact, robust body layout suits tight mounting spaces on trailer chassis and brake control assemblies.

Specifications and Materials

This pressure protection valve suits Sealco style pressure protection applications in trailer air brake systems. Part number: AB8471. The valve uses 3/8 NPT inlet and outlet ports with a closing pressure set around 70psi to protect primary reservoirs from accessory draw down.

Seat and internal geometry are designed for consistent, repeatable opening and closing under normal road service. You can review this air brake technical overview for more background on typical heavy vehicle air brake layouts.

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. 140280, 680-140280, ESL140280, RSL140280, SEA140280, E-SL140280, KN31002, 55140280, SA140280, SLC 140280, SLC140280, GTA-140280, GTA140280, TWD140280, 551 40 280, TV140280, SE140280, TDA RSL140280, TDARSL140280

Compliance and Safety

Firstly, correct pressure protection helps maintain reservoir priority for service brakes, which supports safer trailer operation under accessory failure conditions. Furthermore, installers should follow relevant workshop procedures, check for leaks after installation, and verify valve closing pressure during routine brake inspections. As a result, the system keeps primary braking capacity available when auxiliary equipment develops a fault.

Trailer Applications

Specifically, this pressure protection valve 70psi configuration typically suits trailers using dedicated reservoirs for service brakes and separate air feeds for auxiliary circuits. In addition, it fits many heavy haulage, curtain-sider, tanker, and tipper trailer layouts that route accessories from protected take-off points. Always confirm port sizes, closing pressure, and plumbing orientation against the original valve before finalising fitment.

Cross-reference and Suitability

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

Why Choose ICS Trailers

Similarly, ICS Trailers focuses on heavy vehicle trailer parts, so you receive components selected with real-world fleet requirements in mind. Additionally, our team checks cross-reference data carefully, which helps you match pressure protection valve 70psi replacements with confidence. Finally, our local stock and support make it easier to keep your trailers working with minimal downtime; for related components, browse the Air Brake Parts range at ICS Trailers