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据《Engineering Materials and Design》第22卷第8期40页报导,英国制造和供应密封件的厂商共80家,他们将密封件分成六种:(一)压盖填函,(二)轴封密封件,(三)机械密封件,(四)活塞皮碗和滑帽等,(五)O形、H形和矩形密封圈,(六)U形和V形密封圈以及各种压环。据统计,全面制造和供应上述六种产品的厂商有四家,提供一种至五种产品的有七十六家,如果以每种产品计算,则第一种产品的厂商有37家,第二种有27家,第三种有29
According to “Engineering Materials and Design”, Volume 22, Number 8, Number 40, there are a total of 80 manufacturers in the UK who manufacture and supply seals. They divide the seals into six types: (1) gland packing, (2) shaft seals Seals, (3) mechanical seals, (4) piston cups and sliding caps, (5) O-shaped, H-shaped, and rectangular sealing rings, (6) U-shaped and V-shaped sealing rings, and various pressure rings. According to statistics, there are four manufacturers that manufacture and supply the above-mentioned six kinds of products. There are seventy-six products that provide one to five kinds of products. If the products are calculated by each product, there are 37 first-type products. There are 27 of the 2 species and 29 of the 3 species.