Common resilient seated butterfly valves are developed primarily for fluid isolation as they have got bad control attributes. The seat can be an elastic one piece that holds set up the valve entire body. This design can have its integrity compromised When the valve is kept partly open up. จำหน่ายอุปกรณ์นิวเมติกส์และวาล์วอุตสาหกรรม https://elliotts6162.blogocial.com/pressure-gauge-4-An-Overview-49771993