Plug valve manufacturers, plug valve factory. Plug the opening and closing piece is a hole in the cylinder, around the rotation axis perpendicular to the channel, so as to achieve the purpose of open and close channels. Plug for opening and closing the main pipe and equipment used media, plug body turning of the stem to achieve the opening and closing action. Small non-filling of the plug, also known as "Hancock." Plug the plug body mostly cone (also cylinder), and the body of the tapered bore surface with the composition of seal pair. Plug valve is a valve using the first, simple, switch quickly, the fluid resistance. General plug metal plug by finishing with the valve body to direct contact between the sealing, poor sealing, opening and closing force, easy to wear, usually only for low (no higher than 1 MPa) and small diameter (less than 100 mm) of occasions.