I am a student in Shunde polytechnic,my majoy is E-business TAFE. I am not a clever giry ,but I will try my best to be a Success person. Let us share our attainment in this blog. The dangerous iland in Changlong playfround! Thieve the forbidden fruit. Tremendous hurricane happened in Shunde polytechnic! Look at the picture,can you feel terrible? Some people said so.

This blog show about the valve! Monday, May 14, 2007. Also called cock or stop-cock valves, date back to ancient times, where they were developed for use in citywide Roman plumbing systems. Today, they remain one of the most widely used valves. Contact surfaces, and slightly lifts the plug to reduce the operating torque required to operate the valve. Are the three different types of rotary valves used in industrial plants. They are widely used in fluid-handling systems for flow co.

Are used to control the flow of fluids, the basic. Are used to shut off or, in some cases, partially shut off the flow of fluid. Stop valves are controlled by the movement of the valve stem. And needle valves may also be considered. Are probably the most common. Must be made internally because other. May have globular appearing bodies.