Bendix provides a wide range of pneumatic valves designed specifically for the demanding needs of the trailer industry. These valves, often referred to as Bendix Pmv (Pneumatic Modulating Valves), play crucial roles in various trailer functions, including brake control, suspension systems, and axle lift operations. This article explores the key Bendix PMV offerings and their applications in modern trailers.
Bendix PMV for Trailer Spring Brakes: Safety and Efficiency
Bendix offers advanced spring brake valves with features like pressure protection and anti-compounding to ensure safe and reliable spring brake operation. These features help prevent damage to wheel-ends and contribute to overall vehicle safety.
SR-5™ and SRC-7000™: Leading Spring Brake Control
The SR-5™ valve facilitates rapid release of spring brakes, enabling quick vehicle departure through its integrated reservoir relay function. The SRC-7000™, a lightweight and corrosion-resistant valve, features a swivel-mount design and large internal ports for simplified installation and enhanced protection against contamination. Notably, the SRC-7000™ is a key component of the Bendix® TRSP® (Trailer Roll Stability Program).
SR-2™: Prioritizing Service Brake Performance
The SR-2™ functions as a service brake priority valve, simultaneously filling spring brake chambers and the reservoir. This ensures adequate service brake pressure in the reservoir upon release of the spring brakes. This prioritization enhances braking performance and overall safety.
Bendix PMV for Enhanced Trailer Control
Beyond spring brake control, Bendix PMVs extend to critical functionalities like relay actuation, pressure protection, and lift axle management.
R-12P™ Relay Valve: Optimized Signal Transmission
The R-12P™ relay valve, characterized by zero hysteresis and zero crack pressure, accelerates the control signal from the tractor to the service relay valves on the trailer. It also functions as a slave to the Antilock Braking System (ABS), extending antilock functionality to remote axles not directly managed by the ABS system.
PR-3™: Safeguarding Air Systems
The PR-3™ pressure protection valve typically supplies air to the trailer’s air suspension system. Available in various pressure settings, it can also support other accessory systems as needed. This versatility makes it a valuable component in diverse trailer configurations.
PP-1®: Maneuvering Control for Dollies
The PP-1® push-pull valve, utilized on dollies, serves as a maneuvering control device. When a pneumatically parked dolly (using the TR-3™) needs to be moved, pushing the PP-1® releases the service application. Pulling the button re-engages the parking system, providing convenient and precise control.
Bendix PMV for Lift Axle Management
Bendix offers specialized valves for efficient and safe control of lift axles, optimizing payload distribution and braking performance.
TLV-9000™: Automated Lift Axle Control
The TLV-9000™ lift axle control valve directly interfaces with Bendix® TABS-6™ Advanced single- and multi-channel controllers, ensuring automatic payload distribution. By controlling air flow to both the lift axle and suspension bags, it manages axle raising and lowering. When paired with the Bendix® TR-3™ lift axle service shut-off valve, it prevents service brake applications to a lifted axle.
TR-3™: Versatile Inversion Valve for Dollies and Trailers
The TR-3™ inversion valve finds application in both dollies and trailers. On dollies, it works in conjunction with the DC-4® double check valve to engage the parking brake by applying a service application when the supply line is evacuated. On trailers, the TR-3™ disrupts the control signal to lift axles, preventing wheel lockup when the axle is raised.
SV-4™: Synchronizing Converter Dolly Operations
Used on converter dollies, the SV-4™ synchronizes braking and air supply between the lead and rear trailers. It ensures sufficient air pressure in the lead trailer before supplying air to the rearward trailer, prevents emergency brake application on the lead trailer and dolly if the rearward trailer is lost, vents air from a falsely charged system, and assists in park timing.
Conclusion: Bendix PMV – Essential for Trailer Performance
Bendix PMVs are integral to safe and efficient trailer operation. From spring brake control to lift axle management, these valves ensure reliable performance and contribute to optimized braking, suspension, and overall trailer functionality. Bendix’s commitment to innovation and quality makes their PMV line a trusted choice for the trailer industry.
