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The reliability of an air brake system in a SANY heavy-duty truck depends on the precise coordination of its components. Central to this performance is the genuine SANY parts, such as the Relay Valve with OEM number 152503990071A. This critical valve serves as a local amplifier and quick-release mechanism, drastically reducing brake application and release times for axles located far from the foot valve. The OEM 152503990071A ensures that air pressure is delivered rapidly and proportionally to the brake chambers, promoting balanced braking force across all wheels and preventing dangerous situations like trailer swing or jackknifing.
Relay Valve
Релейный клапан
Válvula de Relevo
The SANY Relay Valve, identified by OEM number 152503990071A, is engineered for exceptional responsiveness and durability. It incorporates a sophisticated pneumatic design that ensures immediate reaction to driver input and consistent pressure control, which is vital for the safety of heavy-duty braking systems.
The valve’s large-diameter inlet and exhaust ports, combined with a low-friction diaphragm, allow for ultra-fast air flow. This minimizes the lag between pedal input and brake chamber pressurization, crucial for emergency stopping.
It precisely mirrors the control pressure from the foot valve in its delivery output. This proportional relationship ensures smooth, predictable braking without abrupt lock-up, enhancing control during gradual deceleration.
The valve body is constructed from corrosion-resistant, anodized aluminum and features high-grade nitrile seals. This robust sealing protects internal components from road contaminants, moisture, and salt, ensuring longevity.
These integrated features make the SANY Relay Valve OEM 152503990071A a cornerstone of brake system efficiency. Its design directly contributes to shorter stopping distances, stable handling, and reduced maintenance intervals.
The detailed technical specifications for the SANY Relay Valve are provided below. These parameters are essential for technicians and system designers to ensure correct application and performance.
This specification table underlines the engineering precision of the SANY OEM 152503990071A. Always verify these details with your vehicle’s service documentation for correct installation and operation.
To ensure the SANY Relay Valve (OEM 152503990071A) performs reliably throughout its service life, proper understanding of its operation, ability to diagnose issues, and adherence to a maintenance schedule are imperative for fleet technicians and operators.
Adhering to this schedule maximizes the performance and lifespan of the 152503990071A valve.
A malfunctioning relay valve is a direct safety hazard. Never delay repairs. Always replace with a genuine SANY part like the OEM 152503990071A to restore designed system performance and ensure reliable, balanced braking.
The SANY Relay Valve OEM 152503990071A delivers indispensable advantages in safety, performance, and operational economy for commercial vehicles equipped with air brake systems.
By positioning the valve near the rear axles, it effectively eliminates the delay caused by long air lines. This ensures simultaneous brake application across the entire vehicle, which is critical for stability during emergency stops, especially when fully loaded.
Balanced braking pressure prevents individual brake linings from wearing out prematurely. This leads to more uniform wear, extended service intervals for brake components, and lower long-term maintenance expenses.
This valve is essential for SANY concrete mixer trucks, dump trucks, logging carriers, and tractor-trailer combinations. It is particularly vital in multi-axle configurations and trailer systems to prevent jackknifing and ensure controlled, synchronized stopping power.
Therefore, the SANY Relay Valve is a proactive safety device integral to modern braking systems. The genuine part number 152503990071A is specifically tuned to the pneumatic characteristics of SANY vehicles, including reservoir capacities and brake chamber sizes. Installing a non-specification valve can disrupt the delicate pressure balance, leading to uneven braking, increased stopping distances, and potential loss of control.
The economic argument is compelling. By ensuring reliable and balanced braking, the valve safeguards against costly accident-related repairs, downtime, and liability. Its durability under harsh conditions reduces unexpected failures, contributing to higher vehicle availability and a lower total cost of ownership for fleet operators. Investing in the genuine OEM part is an investment in predictable performance and safety.
The SANY Relay Valve with OEM number 152503990071A is a fundamental component that defines the responsiveness and reliability of your truck’s air brake system. Its role in ensuring rapid, balanced braking force distribution is indispensable for safe heavy-duty vehicle operation.
Always choose genuine SANY parts like the 152503990071A to maintain the engineered safety, performance, and integration of your braking system. This valve is built to withstand the test of time and terrain, providing confidence with every application. Discover our complete range of genuine SANY brake and pneumatic system components in our catalog.
In the realm of commercial transportation, safety is engineered into every component. The OEM 152503990071A Relay Valve stands as a testament to this principle, ensuring your SANY truck delivers controlled, dependable stopping power day after day.
The SANY Relay Valve, part number 152503990071A, operates on well-established but brilliantly applied pneumatic principles. It functions as a pressure repeater and quick-exhaust device. The valve has three primary ports: the supply port (connected to a secondary air reservoir), the delivery port (connected to the brake chambers), and the control port (connected to the foot valve or treadle valve).
When the driver applies the brakes, air pressure from the foot valve travels through the control line to the relay valve. This control pressure acts upon a diaphragm or piston inside the valve. This force opens a large inlet valve, allowing the high-volume air stored in the local reservoir (near the axles) to flow directly and swiftly into the brake chambers. This design bypasses the long air line from the front of the vehicle, which would introduce significant lag due to airflow restrictions and the time needed to pressurize a long pipe.
The “relay” function is one of amplification: a small control signal triggers a large, localized release of energy. Furthermore, the valve maintains proportionality. The delivery pressure fed back to the diaphragm chamber balances the control pressure. When equilibrium is reached, the inlet valve closes, holding a steady pressure. Upon release of the control signal, the equilibrium is disrupted, and an exhaust valve within the relay valve opens, venting air from the brake chambers directly to the atmosphere. This “quick-release” feature is why relay valves significantly improve brake release times compared to systems without them.
The materials chosen for the OEM 152503990071A, such as anodized aluminum and high-grade nitrile rubber (NBR), are critical. Aluminum provides a lightweight yet strong housing resistant to corrosion. NBR diaphragms and seals offer excellent resistance to the ozone, moisture, and slight oil contamination present in compressed air systems, ensuring consistent flexibility and sealing over a wide temperature range.
System calibration is paramount. The valve’s crack pressure (the minimum control pressure needed to open it) and its flow characteristics are precisely matched to the vehicle’s brake chamber sizes and desired brake timing sequence. This is why the genuine SANY part is non-negotiable—it is an integral part of a meticulously designed system. An incorrect valve can cause rear brakes to apply too aggressively or too sluggishly, upsetting the vehicle’s balance during deceleration.
This technical exploration reveals the SANY OEM 152503990071A Relay Valve as a sophisticated pneumatic amplifier. Its seemingly simple operation masks a critical role in vehicle dynamics and safety. It exemplifies how targeted engineering in auxiliary components is essential for the reliable performance of primary systems like braking, where failure is not an option.
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