Ningbo qingyun Seals Co., Ltd is a professional manufacturer & exporter of mechanical seals, sealing materials, shaft seals and pumps parts,We mainly produce mechanical seals for all kinds of rubber bellow type, metal bellow type, O-ring seals and cartridge mechanical Seal, besides, the sealing materials such as SiC, TC, Al2O3, cermet, graphite etc., which according to the standard of DIN24960,ISO3069,API610 and GB6556-94