Look up: ball-valve

1. 
   ball valve
   [n] - any valve that checks flow by the seating of a ball
   Found on http://www.webdictionary.co.uk/definitio
   
   
2. 
   Ball Valve
   Valve that contains a sphere with a hole through it, the “ball� can be rotated thus turning the valve on or off, similar to a plug valve in function.
   Found on http://www.anson.co.uk/oilfield_glossary
   
   
3. 
   ball valve
   a flow-control device employing a ball with a rotating mechanism to open or close the tubing medium.
   Found on http://www.workover.co.uk/og/B%20-%20Glo
   
   
4. 
   ball valve
   Any of a variety of prosthetic cardiac valve's comprised of a ball within a retaining cage affixed to the orifice; when appropriately sized, used in aortic, mitral, or tricuspid position. ... (05 Mar 2000) ...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
5. 
   ball valve
   noun any valve that checks flow by the seating of a ball
   Found on http://wordnet.princeton.edu/perl/webwn?
   
   
6. 
   Ball valve
   A `ball valve` (like the butterfly valve, one of a family of valves called `quarter turn valves`) is a valve that opens by turning a handle attached to a ball inside the valve. The ball has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur. When the valve is closed, the hole is perpendicular to the ends of the valve, and flow is blocked. The handle position lets you `see` the valve's...
   Found on http://en.wikipedia.org/wiki/Ball_valve
   
   
7. 
   ball-and-seat valve
   a device used to restrict fluid flow to one direction. It consists of a polished sphere, or ball, usually or metal, and an annular piece, the seat, ground and polished to form a seal with the surface of the ball. Gravitational force or the force of a spring holds the ball against the seat. Flow in the direction of the force is presented, while flow in in the opposite direction overcomes the force and unseats the ball.
   Found on http://www.workover.co.uk/og/B%20-%20Glo