Trunnion mounted ball valves are mainly used in high pressure and large diameter ball valves. According to the installation of the seat ring, the trunnion mounted ball valve has two structures: a ball seat sealed in front of the ball and a valve seat sealed in the ball.

The ball valve is composed of valve: body,ball,stem,sealing ring,packing, etc., and the butterfly valve is composed of valve: body,disc,stem,packing,etc. We will find following differences between ball valve and butterfly valve,and these are main points:body’s type,working conditions,operation,etc