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  • Diankou Industrial Area, Zhuji, Zhejiang, China

  • +86-575-87657752

  • +86-13456546016

  • [email protected]

Zhuji Weicheng Auto Parts Co.,Ltd.

Zhuji Weicheng Auto Parts Co., Ltd. is located in Diankou Town, Zhuji City, Zhejiang province of China. As China OEM Truck Relay Valves Manufacturers, Factory, we specialize in the research, development, design, and manufacture of heavy duty trucks and trailers control system accessories.

Our products including foot brake valve, hand brake valve, relay valve, unloader valve, four circuit protection valve, trailer control valve, air dryer, spring brake chamber, clutch booster, and slack adjuster, are widely used on many types of the heavy vehicle around the world, such as MERCEDES BENZ, SCANIA, VOLVO, MAN, DAF, and HINO.

Our company introduces hi-tech quality testing instruments and precise production equipment. Truck Relay Valves OEM. Meanwhile，we have also invited senior engineers and professional technicians to engage in product research, development, and production. At present, our products of the highest quality, competitive price, and excellent services have won a good reputation among customers at home and abroad.

For the Customer Provides the Omni-directional Service

  • For Manufacturers & Fabricators

    • Automotive Parts, Precision Tools & Dies
    • High quality CNC machining parts and Special Automation equipment.

  • For Wholesalers& Distributors

    • Competitive pricing on bulk orders
    • The customers are different but Weicheng has one unique philosophy to guide the latter to success.

  • For Project Contractors

    • Produce custom auto parts with client-specific measurements
    • Hundreds of CNC precision tooling and molds diversify your marketing campaign.

Company Certificate

As Wholesale Truck Relay Valves Factory, our products have a variety of certification,
SGS/ROHS/ISO14001/IATF16949

  • Address:

    Diankou Industrial Area, Zhuji, Zhejiang, China

  • Mob:

    +86-13456546016

  • Tel:

    +86-575-87657752

  • Fax:

    +86-575-87616386

  • Email:

    [email protected]

If you need it, please contact us!

We have a strong R&D team,and we can develop and produce products according to the drawings or samples the customers offered.

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Industry Knowledge

Relay valves are essential components of the air brake system in heavy-duty trucks. They serve as intermediaries between the brake pedal and the brake chambers, helping control the application and release of the brakes. Here are some common characteristics of relay valves for heavy-duty trucks:
Brake Activation and Release: Relay valves are responsible for activating and releasing the brakes in response to the driver's input. When the driver applies the brake pedal, the relay valve receives the signal and allows compressed air to flow into the brake chambers, applying the brakes. When the brake pedal is released, the relay valve exhausts the air pressure from the brake chambers, releasing the brakes.
Dual Circuit Operation: Relay valves in heavy-duty trucks often have a dual circuit design. This means that they control the application and release of the brakes for both the front and rear axles separately. Dual circuit operation ensures redundancy and enhances safety.
Pressure Regulation: Relay valves regulate the air pressure supplied to the brake chambers. They ensure that the proper amount of air pressure is delivered to achieve effective brake application and maintain optimal brake performance.
Quick Release Function: Relay valves feature a quick release function that allows for the rapid release of brake pressure when the brake pedal is released. This quick release helps in disengaging the brakes swiftly, ensuring smooth operation and reducing the risk of wheel lock-up.
Load Sensing Capability: Some relay valves incorporate load sensing mechanisms to adjust the brake force according to the load carried by the vehicle. These load sensing relay valves help optimize brake performance by ensuring appropriate brake force distribution based on the vehicle's load conditions.
Pressure Protection: Relay valves may include pressure protection features to prevent excessive pressure buildup in the brake system. These features help maintain the integrity of the brake system by preventing over pressurization, which could lead to brake lock-up or damage to brake components.
Compatibility and Mounting: Relay valves are designed to be compatible with the specific air brake system and the truck make and model. They are typically mounted in close proximity to the brake chambers, ensuring efficient air delivery and response.
Durability and Reliability: Relay valves for heavy-duty trucks are built to withstand the demanding operating conditions encountered in commercial applications. They are made from durable materials and designed to resist vibration, temperature extremes, moisture, and other environmental factors.
Compliance with Standards: Relay valves adhere to industry standards and regulations to ensure safety and compliance. They meet requirements set by organizations such as the National Highway Traffic Safety Administration (NHTSA) and relevant regional safety regulations.
Maintenance and Serviceability: Relay valves are designed for ease of maintenance and serviceability. They may have accessible mounting brackets, connections, and fittings, allowing for straightforward installation, inspection, and replacement during maintenance or repairs.
Zhuji Weicheng Auto Parts Co., Ltd.

Zhuji Weicheng Auto Parts Company masters advanced technologies, and manufacture efficient and durable products for customers as the company's responsibility. Truck Relay Valves Manufacturers in China