Butterfly valve,also called flap valve,has a 90 angle of rotation from full open to shun-off and a relatively short

length and overall height,which enable it to open and shun off in a faster manner.Its good characteristics of fluid

control makes it widely used in oil-immersed power transformer and detachable radiators,coolers and tubes of 

oil conservators.Butterfly valves produced by our company chiefly comprise vacuum-type accentric butterfly 

valve and hard seal butterfly valve.These valves are made of such materials as cast iron,ductile cast iron,brass,magaluma,steel plate,stainless steel.ect.

Hard sealed buttefly valve which adopts metallic seal structure is a new type of valve seal structure,by

coordinating metallic butterfly plate and metal between the inner holes of the valves to achieve

sealing.Compared with elastic sealed butterfly valve,metallic sealed butterfly valve can adapt to a higher working

temperature,as well as enjoying a long service life,while it is very difficult to get fully sealing.If pressure tests are 

done on this type vavles,you must seal up one end of the butterfly valve,then carrying out the operation of 

vacuum-pumping or pressization.

This product with unique cover structure and direct viewing showing the status of the current butterfly valves 

without removing the valve cover,thus making it easier and more convenient to maintain and repair the valve.