European Circuit Protection Valve Manufacturers

European Circuit Protection Valve Manufacturer – Zhejiang Gongzheng Machinery

Zhejiang Gongzheng Machinery Co., Ltd. is a professional manufacturer and supplier of European Circuit Protection Valves for commercial vehicle air brake systems. Our product range covers two-circuit, four-circuit, and multi-circuit protection valves used on heavy-duty trucks, buses, and trailers. We design and produce these valves to meet European vehicle standards, ensuring reliable pressure distribution and circuit isolation in pneumatic braking systems.

As a Wholesale European Circuit Protection Valve Manufacturers, we support OEM projects, aftermarket distribution, and fleet maintenance programs with a wide selection of port configurations, opening pressures, and mounting styles.

Product Range and Application Fit

Our European Circuit Protection Valves are available in several functional variants. Each type is engineered for a specific role in the air brake system architecture.

Critical Specifications and Performance

Each valve is defined by its opening pressure, flow capacity, and port configuration. We manufacture valves with opening pressures ranging from 6.0 bar to 8.5 bar, depending on the circuit requirement. The number of protected circuits (2, 4, or more) determines how many independent pneumatic subsystems can be supplied from a single inlet.

• Port sizes: M16×1.5, M22×1.5, PTF 1/4, PTF 3/8, and VOSS variants.
• Mounting: Flange-mounted, stud-mounted, or bracket-mounted for chassis integration.
• Operating temperature: -40°C to +80°C, suitable for all-weather operation.
• Media: Compressed air, filtered and dried per ISO 8573-1.

Configuration and Customization

We offer standard models from stock and customized configurations for OEM programs. Customization options include port thread type, opening pressure calibration, sensor integration (5V or 24V), and body material (aluminum or corrosion-protected steel). Our engineering team works with your specifications to produce valves that match existing pneumatic layouts or new vehicle designs.

Quality Assurance and Testing

All European Circuit Protection Valves are tested for function, leakage, and pressure response before shipment. Our factory operates under IATF 16949 quality management, and we maintain in-house testing equipment for flow rate, cracking pressure, and endurance cycles. Each production batch is traceable.

Integration with Air Brake Systems

The circuit protection valve is typically installed downstream of the air dryer and pressure regulator. It distributes compressed air to independent circuits such as service brake, parking brake, auxiliary, and suspension. In the event of a circuit failure, the valve isolates the damaged circuit while maintaining pressure in the remaining circuits. This function is critical for vehicle safety and regulatory compliance.

We also supply complementary components including European Air Dryer, European Pressure Limiting Valve, and European Relay Valve for complete system supply.

Information We Use to Configure Your Solution

To prepare a quotation and select the correct valve, we need the following project information:

• Number of circuits to be protected (2, 4, or custom).
• Required opening pressure per circuit.
• Port thread type and size (M16, M22, PTF, VOSS).
• Mounting space and bracket preference.
• Operating voltage if sensor integration is needed (5V or 24V).
• Expected flow rate (liters per minute) and system pressure.
• Target vehicle type and regional regulatory requirements.

Packaging and Delivery

Valves are individually packed in protective cartons with labeling per customer requirements. Bulk packaging for aftermarket distribution is available. We maintain a standing inventory of over 200,000 units across our product range, enabling fast dispatch for standard models.

Frequently Asked Questions