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PTFE sight glass / PFA / PFA-lined
The ANSI 150 series of sight glasses from Zhejiang YFM Valve Co.,Ltd employs a high vacuum. Its flanges are compliant to ASME/ANSI 16.5 ,DIN,JIS standards. These products are engineered from hardened and quartz glass, with a 1-10 NPS nominal diameter, and their pipes are made from A216/WCB. They have also been designed according to HG/T21622-1990 standards.