Haldex Air Brake Pressure Protection Valve
Haldex Air Brake Pressure Protection Valves: Safeguarding Commercial Vehicle Braking Systems
When a leak or failure strikes an auxiliary air circuit on a heavy-duty truck, trailer, or bus, the last line of defense between a safe stop and a catastrophic loss of braking is the pressure protection valve. Haldex has spent well over a century engineering exactly these kinds of critical air brake components, and their air brake pressure protection valves represent that deep institutional knowledge in a compact, hard-working package.
What a Pressure Protection Valve Does — and Why Haldex Gets It Right
A pressure protection valve (PPV) works by isolating the primary brake air reservoir from secondary circuits — such as air suspension, air seats, or auxiliary systems — whenever supply pressure drops below a preset threshold. This ensures that even during a major leak in a non-braking circuit, the foundation brake system retains enough air pressure to bring the vehicle to a controlled stop.
Haldex engineers its PPVs so that every closing pressure is predetermined and tested at the production stage, delivering consistent, repeatable performance right out of the box. Their lineup covers a range of port sizes and closing pressures to match the diversity of modern commercial vehicle platforms — including 1/4" NPT and 1/2" NPT port configurations, with calibrated closing pressures available at 65 psi (4.5 Bar), 80 psi (5.5 Bar), and 90 psi (6.2 Bar), making it straightforward to spec the correct valve for virtually any heavy truck or trailer application.
Built for Heavy-Duty Reliability
Haldex pressure protection valves are constructed using durable materials such as brass and stainless steel that resist rust and corrosion — critical traits for components exposed to moisture-laden air lines and harsh road environments. Designed for demanding commercial vehicle duty cycles, these valves are rated to handle maximum operating pressures well beyond normal system ranges, providing a robust safety margin for fleet operators.
As part of Haldex's broader Air Controls product family — which spans compressed air dryers, ABS/EBS modulators, and a full range of air valves — the pressure protection valve integrates naturally into a Haldex-equipped air brake system, simplifying parts management and ensuring cross-component compatibility for fleet maintenance programs.
A Legacy of Commercial Vehicle Safety
Founded in 1887 and backed by over 130 years of brake and air suspension innovation, Haldex is a globally recognized OE and aftermarket supplier to major truck, bus, and trailer manufacturers across the Americas, Europe, and Asia. Their pressure protection valves carry that same OE-level engineering rigor into the aftermarket, helping fleets reduce downtime and keep maintenance costs predictable.
Whether you are replacing a worn component on a line-haul tractor or servicing a trailer's air circuit, Haldex PPVs are a trusted, specification-grade choice. Browse the full selection of air brake pressure protection valves or explore the complete Haldex brand catalog to find the right solution for your application.