First, large diameter metal seal butterfly valve Description: 
D343H, D343Y, D341H PN6 ~ PN40 multi-level hard-seal butterfly valve installed in the petroleum, chemical, food, medicine, textile, paper, water and electricity, ships, water supply and drainage, smelting and other systems , In all water, gas, oil, semi-fluid and solid powder pipelines and containers used as regulation and closure, can be installed in any horizontal or vertical pipelines. D343H Turbine metal hard sealing butterfly valve than the soft rubber sealing butterfly valve to help long life, the valve is usually carbon steel or stainless steel.