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Zhejiang Zhengfeng Valve Co., Ltd. is committed to delivering industrial valves of exceptional quality. Our quality management system is integrated into every stage of production-from raw material procurement to final shipment-ensuring every valve meets or exceeds customer expectations and international standards.
Strict Raw Material Inspection
We source raw materials from long-term, trusted suppliers. Before production, every batch undergoes chemical composition analysis, mechanical performance evaluation, and PMI (Positive Material Identification) tests in our dedicated laboratories. This ensures all materials comply with ISO, API, BS, and GB standards.
Incoming Component Testing
Castings, forgings, and accessories are tested upon arrival. Our QC team performs dimensional checks, hardness tests, and visual inspections before components enter production. Only qualified parts move forward, guaranteeing consistency and reliability.
In-Process Dimensional Inspection
During machining, strict dimensional inspections are carried out to ensure tolerances are maintained. Every step is monitored by quality engineers using precision equipment, ensuring zero deviation from the design parameters.
Performance Testing of Finished Products
Before leaving the factory, each valve undergoes 100% hydrostatic testing, sealing performance testing, and torque performance verification. Depending on requirements, we also conduct painting tests, thickness measurements, and switch cycle tests.
NDT (Non-Destructive Testing)
Our QC team conducts Non-Destructive Testing including PT (Penetrant Testing), UT (Ultrasonic Testing), and other methods to detect internal and surface defects without damaging the product.
Final Inspection and Packaging
Before shipment, all valves are subjected to a final visual and dimensional inspection. After passing, each unit is cleaned (e.g., ultrasonic cleaning), painted as required, and carefully packaged to prevent transit damage.
Third-Party Inspection Support
We welcome third-party inspections upon customer request. Customers may nominate inspectors to witness and verify each production stage.
Our valves are manufactured under a robust quality management system and have obtained key certifications such as ISO 9001. All test records, inspection reports, and certificates can be provided upon request to ensure full traceability.
