... below designed before are served as reference. knife gate valve type features:1, seal by structural ceramics, ... sealing and reliable.6.working principle: a. low pressure difference condition, gate main through stem external force andguide ... SP81,MSS SP135,ASME B16.35,ASME B16.10,DIN3202Flange Connection DimensionASME B16.5 DIN2532,ASME ... ,ANSI,DIN BS,AND JIS . non rising stem flange knife gate valve