... 1,flange type,size: 2" -72", 2,rating:150lb-600l. Two-way Sealing Butterfly Valve Dual-clamp butterfly valve is an advanced ... solid powder in them, Which be long to the pipe system of peteoleum, chemical, textile, shipbuilding and metallurgic industries; of ... without rubbing or galling,providing a torque generated resilient seal with sufficient"wedging" to ensure auniform seal contact.The triple ...