... : 1,flange type,size: 2" -72", 2,rating:150lb-600l. Two-way Sealing Butterfly Valve Dual-clamp butterfly valve is an advanced ... gases, liquids, semifuid and solid powder in them, Which be long to the pipe system of peteoleum, chemical, textile, shipbuilding and ... compressive sealing arount the entire seat.Friction free sealing for long cycle life (1)Seat is Cr13 matal alloy or hardfaced ...