The valve seat surface can be coated with Supersonic Spray STL20 Alloy

The metal sliding contact surfaces of ball valves need to have a certain hardness difference, or else they may experience galling. In practice, the hardness difference between the valve ball and seat typically ranges from 5 to 10 HRC, providing optimal service life for the valve. Due to the complex machining process of the ball, which also incurs high costs, the ball is generally chosen to have a higher hardness than the valve seat to protect it from damage and wear.     GEKO Brand Ball Valves stand out with their high-quality materials and precise manufacturing processes, offering exceptional performance in hardness matching between the ball and seat. Various hardness combinations are utilized to ensure long-term stability and efficiency. Below are two commonly used hardness pairings:      - Ball Hardness 55 HRC, Seat Hardness 45 HRC: The valve ball surface can be coated with supersonic sprayed STL20 alloy, and the valve seat surface can be welded with STL12 alloy. This hardness combination is the most commonly used for metal-sealed ball valves, meeting the general wear requirements of metal-to-metal sealing. This pairing is widely used in GEKO Brand metal-sealed ball valves, ensuring excellent performance under high loads.         - Ball Hardness 68 HRC, Seat Hardness 58 HRC: The valve ball surface can be coated with supersonic sprayed tungsten carbide, and the valve seat surface can be supersonic sprayed with STL20 alloy. This hardness combination is widely used in coal chemical industries, providing higher wear resistance and extended service life. GEKO’s high-hardness ball valves have been extensively applied in coal chemical industries, helping users extend equipment life cycles and reduce maintenance costs.       Selecting the correct hardness combination can effectively prevent galling and ensure that GEKO Brand Ball Valves operate reliably under various harsh conditions, offering extended service life and lower maintenance requirements.   Contact us now for more information： info@geko-union.com