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Butterfly Valves operate up to 200 psig.

原文:
November 6, 2001 - Resilient seated butterfly valves offer phenolic backed cartridge seat to provide full rated Resilient Seated Gate Valves dead-end service on all lug pattern valves. Torque values are minimized by use of 4 Teflon bushings properly aligned down blowout proof shaft. Valves are manufactured with cast Automatic Control Valves iron bodies; ductile iron nickel plated, aluminum bronze, or 316 SS discs; and Buna-N, EPDM, or Viton Butterfly Valves resilient seats. They are available in sizes from 2 to 48 in. in wafer and lug patterns.
原文来自:http://news.thomasnet.com/fullstory/3956

以下是参考译文:

译文:
2001年11月6日-坐在蝶阀酚醛提供支持的磁带座位,提供弹性全额定穷途末路的服务模式,对所有卢格阀门。扭矩值最小的4铁氟龙套管正确使用证明了井喷轴对齐。阀门的制造与铸铁机构;球墨铸铁镀镍,铝青铜,或316不锈钢盘和丁腈橡胶,三元乙丙橡胶或氟橡胶弹性席位。这些产品大小从2至四十八英寸以晶圆与卢格模式。