Quality

Certified quality systems & product approvals

Review CLDG Valve Certifications

View our API 602, API 624, ISO management system, ISO 15848-1 and PED certification documents.

View certifications

CLDG Quality—Inspected, Certified, Delivered

Quality That Earns Trust

99%+

First-Pass Rate

100%

Quality Control

We guarantee consistent quality with 17 control points throughout the production process, backed by high-precision equipment like spectrometers and tensile testers. Every valve is tested thoroughly, and we follow global quality standards with detailed 8D reports for issue tracking. Our first-time pressure test pass rate reaches 99%, helping reduce quality costs by 8% and ensuring stable, reliable performance.

Independent Laboratory for
Quality Assurance

To uphold our commitment to excellence, CLDG has built an independent laboratory with state-of-the-art testing equipment. By implementing quality control at every stage, we ensure our forged valves meet the highest standards for reliability and performance:

Spectrometer for chemical analysis

Uses OES/XRF to detect C, Cr, Ni, Mo with ±0.05% precision, ensuring all forged valves meet ASTM and GB standards.

Metallographic microscope for structure analysis

Analyzes grain size (ASTM 5–8) and detects inclusions or cracks, optimizing heat treatment for long-term valve durability.

Impact tester for shock resistance

Performs Charpy V-notch tests at -46°C, verifying each valve absorbs over 20J energy to ensure anti-brittle fracture performance.

Tensile tester for strength evaluation

Tests yield strength above 240MPa and elongation over 20%, guaranteeing valves maintain structural integrity under high pressure.

Temperature chamber for extreme environment testing

Simulates extreme conditions from -196°C to +200°C, verifying sealing stability, material expansion, and operational performance durability.

Where Every Valve Passes the Test of Excellence

Raw Casting Inspection

By inspecting cast/forged blanks for defects and dimensions, we prevent waste and ensure valve integrity, reducing cracking risks.

Component Inspection