difference between plug valve and ball valve
Plug Valves are valves with cylindrical or conically-tapered "plugs" which can be rotated inside the valve body to control flow through the valve. A control device using a cylindrical- or conically- shaped plug with a hole through it that can be turned 90 degrees to the water or natural gas flow path to stop flow, or aligned with the flow path to allow the fluid to pass.A valve with a revolving plug with an opening to permit passage of liquid when the opening is alined with the bore of the pipe.
Ball Valves:A solid or hollow sphere or ovoid, esp. one that is kicked, thrown, or hit in a game A solid nonexplosive missile for a firearm form into a ball by winding or rolling; "ball wool" ;A ball-shaped object; musket ball: a solid projectile that is shot by a musket; "they had to carry a ramrod as well as powder and ball"; round object that is hit or thrown or kicked in games; "the ball travelled 90 mph on his serve"; "the mayor threw out the first ball"; "the ball rolled into the corner pocket".
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