二片式球阀 2-PC BALL VALVE型号Size 1/4” 3/8” 1/2” 3/4” 1” 1 1/4” 1 1/2” 2” 2 1/2” 3”介质Medium 蒸汽, 气体, 液体, 粘或腐蚀性流体Steams, Gases, Liquids, Viscous or corrosive medium阀体材质/球 Body material/ball 不锈钢 Stainless steel 316/304密封 Seals PTFE螺纹连接 Thread type NPT、BSPT、BSP、DIN259/2999