... quality best price material: 304, 316 ,316L , Hastelloy c,HastelloyB ,17-7PH 20#alloy nonstandard spring mechanical seal ... force,it can be operated under the high rotate speed. 2, Any impurities are ... It applies to the condition of high temperature and high pressure.4,It's easy to ... Imported material is widely used in manufacturing mechanical seals2,Direct factory price3,Professional technical services4 ...