... production,sales of butterfly valve manufactures, We specialized in wafer butterfly valve,worm butterfly valve,lug butterfly valve, flange butterfly valve,electric butterfly valve, pneumatic butterfly valve,dual plate check valve and soft seal gate valve,DN40-1200, ... with all friends!API 609 Standard Worm Gear Operation Butterfly Valve Model D37A1X—16Diameter DN40—DN1200Pressure PN1.0—1.6MpaMedium ...