- ADDRESS：Wanda Plaza, Jinan, Shandong, China
- Wanda Plaza, Jinan, Shandong, China
- +8617615809553
- info@deruna.com
In the critical air brake system of a heavy-duty SANY truck, responsive and balanced braking is essential for safety and control. This vital function relies on specialized components like the genuine SANY parts, specifically the Relay Valve with OEM number 152503990072A. This valve acts as a rapid-response amplifier, receiving a control signal from the foot valve and quickly delivering air pressure to the brake chambers on the rear or trailer axles, significantly reducing brake lag. The OEM 152503990072A is engineered to ensure synchronized braking across all wheels, preventing dangerous jackknifing and uneven wear.
Relay Valve
Релейный клапан
Válvula de Relevo
The SANY Relay Valve, identified by OEM number 152503990072A, is a precision pneumatic device designed for speed, reliability, and durability. It plays a pivotal role in modern air brake systems by optimizing pressure delivery to improve response times and overall braking balance.
The valve’s internal diaphragm and piston are engineered for minimal inertia, allowing it to react instantly to control pressure changes. This drastically reduces the application and release times for brakes on distant axles.
It maintains precise pressure proportionality between the control line and the delivery line. This ensures that brake force is evenly distributed, preventing wheel lock-up and promoting stable, straight-line stops.
The valve body is made from high-grade aluminum alloy with anti-corrosion treatment. Internal seals are made from nitrile rubber compatible with standard air brake system oils and moisture, ensuring long service life.
These features make the SANY Relay Valve OEM 152503990072A a critical component for safety. Its design directly contributes to shorter stopping distances and more predictable braking behavior under various load conditions.
The following table provides detailed technical specifications for the SANY Relay Valve. These parameters are crucial for system compatibility and performance verification.
This specification table highlights the engineering precision of the SANY OEM 152503990072A. Always verify these details against your vehicle’s service manual for correct application.
Proper functioning of the SANY Relay Valve (OEM 152503990072A) is critical for brake system safety. Understanding its operation, recognizing symptoms of failure, and adhering to a maintenance schedule are essential practices for every fleet manager and technician.
Proactive maintenance focused on air quality can triple the service life of the 152503990072A valve.
Never ignore signs of relay valve problems. A faulty valve compromises the entire braking system’s effectiveness and safety. Always replace with a genuine SANY part like the OEM 152503990072A to ensure proper calibration and reliability.
The SANY Relay Valve OEM 152503990072A delivers critical performance and safety benefits, making it an indispensable component in modern commercial vehicle air brake systems.
By positioning the valve close to the rear brake chambers, it drastically shortens the air travel path. This allows brakes to apply and release much faster than if controlled solely from the front, improving reaction time in emergency stops.
Precise pressure balancing ensures that all brake shoes engage with consistent force. This promotes uniform wear across all linings, extending service intervals and reducing maintenance costs over the vehicle’s life.
This valve is critical for SANY dump trucks, mixers, and tractor-trailer combinations. It is especially vital in trailer brake systems, where it ensures prompt and synchronized braking between the tractor and trailer, preventing dangerous sway or jackknife situations.
Therefore, the SANY Relay Valve is not merely a passive component but an active safety device. The genuine part number 152503990072A is calibrated to work in perfect harmony with SANY’s specific brake system architecture, including air chamber sizes and treadle valve characteristics. Using a generic valve can lead to mismatched response curves, resulting in poor braking balance and increased risk.
The economic benefits are equally significant. By ensuring balanced braking, the valve prevents costly uneven tire wear and excessive brake lining consumption. Its reliability minimizes roadside breakdowns and costly tow charges associated with brake system failures. For fleet operators, this translates into predictable maintenance, higher vehicle availability, and, most importantly, a demonstrably safer fleet.
The SANY Relay Valve with OEM number 152503990072A is a fundamental component that directly influences the responsiveness, balance, and safety of your truck’s air brake system. Its role in reducing brake lag and ensuring synchronized wheel braking cannot be overstated.
Always specify genuine SANY parts like the 152503990072A to maintain the designed safety margins, performance, and reliability of your braking system. This valve is engineered to meet the rigorous demands of heavy-duty cycling, providing confidence with every stop. Explore our full catalog for all your genuine SANY brake system components.
In commercial trucking, safety is paramount, and it begins with reliable brakes. The OEM 152503990072A Relay Valve is built to be a dependable partner in that mission, ensuring your SANY truck stops as effectively as it goes.
The SANY Relay Valve, part number 152503990072A, operates on a brilliant principle of air pressure amplification and rapid local control. It has two primary air connections: a control port (from the foot valve) and a supply port (from the main air reservoir). A third port delivers air to the brake chambers. When the driver presses the brake pedal, a small control air signal travels from the foot valve to the relay valve’s control port.
This control pressure acts on a large diaphragm inside the valve, creating force. This force opens an internal inlet valve, allowing high-pressure air from the local supply reservoir (often a dedicated rear brake tank) to flow directly and swiftly into the brake chambers. Because the supply air is locally stored near the brakes, it does not have to travel the long distance from the front of the truck, eliminating the delay inherent in long air lines. This is the “relay” function—using a small signal to trigger a large, local release of energy.
The valve also incorporates a balancing mechanism. The delivery pressure to the brake chambers acts on the opposite side of the diaphragm. When the delivery pressure rises to match the control signal pressure, the forces balance, and the inlet valve closes, maintaining a steady hold pressure. When the control signal is released (foot off the brake), the equilibrium is broken, and an exhaust valve opens, rapidly venting air from the brake chambers to the atmosphere for quick release.
The double-diaphragm design in models like the 152503990072A adds reliability. One diaphragm reacts to the control signal, while a second, larger one handles the high-volume supply air. This separation allows for more precise control and reduces the chance of failure under high cycling conditions. The materials, such as reinforced NBR diaphragms, are selected for their flexibility, durability, and resistance to the oils and moisture present in compressed air systems.
System integration is key. The valve’s crack pressure (the control pressure at which it begins to open) and its flow characteristics are tuned to the specific vehicle’s axle load, chamber size, and desired brake timing. This is why the genuine OEM 152503990072A is critical—it is calibrated as part of a holistic system design. A mismatch can lead to rear brakes applying before the fronts (causing instability) or too late (reducing effectiveness).
This technical deep dive confirms that the SANY OEM 152503990072A Relay Valve is a sophisticated pneumatic computer. Its simple appearance belies a complex function that is vital for converting the driver’s intention into safe, controlled deceleration. It is a prime example of how engineered components create safety in modern heavy-duty vehicles, and why compromising on its quality is never an option.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
We are a first-class heavy duty vehicles and spare parts supplier in China. which covers from engine, gearbox, cab, axle assemblies to main assembly accessories, electrical parts and other chassis parts like brake, clutch and steering parts.
A PROFESSIONAL CHINA TRUCK AND SPARE PARTS SUPPLIER
@Copyright DERUNA
