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1. Stellite No. 01 alloy-American quality; Enhanced wear-impact-resisting properity of tip end ensures no collapse.
2. base metal-Choosing high-quality 5Cr21Mn9Ni4N for outlet valve production and high-quality 4Cr1oSi2Mo for inlet valve.
3. Forging-Adopting fine electric upsetting to protect metal flow-line and ensure high resistance
4. Stellite No. 06 alloy-Vacuum built-up welding, perfect vacuum work.
5. heat treatment-Adopting automatic quenching line and neutral gas protection to ensure high-quality.
6. Precision processing-Automatic rod centerless grinding, good consistency of digital control lathe and intensified rolling extresion of cotter groove.
7. Testing-Air tightness testing of conical surface ensures strong power. Fault detection by ultrasonic wave to ensure no internal and external fault.