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Ball Valves Terms

Actuator – Used to operate the ball valve. The actuator is often used to control the flow of materials.

Ball – The closure portion of the valve that restricts or controls the fluid or gas flow.

Butterfly Valve (http://www.butterfly-valves.org) – A valve that utilizes a circular disc or vane in order to control flow by turning the valve’s pivot axis at 90¼ angles to the pipe’s flow direction.

Flange – A projecting rim or edge used to strengthen or attach one object to another.

Full Bore Value – The diameter of ball inside the valve equals the diameter of the pipe. This is also called full port.
 
Globe Valve – A globular shaped valve whose internal moving parts consist of the disk, the valve stem and the handwheel.
 
Poppet Valve – A valve that moves up to or from its seat perpendicularly. This valve generally provides more flow than a ball valve.
 
Port – Flow path.
 
Pressure Control Valve – A valve that controls the amount of pressure. Typically the valve will shut when a pre-determined pressure is reached.
 
Pressure Relief Valve – A valve that releases pressure if needed. This valve is self-operating.
 
PSI (Pounds Per Square Inch) – A unit of pressure; equivalent to the metric unit of Kilonewtons per square centimeter.
 
Reduced Bore Value – The ball inside the valve has a hole smaller than the opening in the pipe, allowing for better control. This is also called standard bore or port.
 
Relief Valve – A valve that when open allows for the release of excess pressure or temperature.
 
Slurry – A mixture of liquid, typically water, and solid materials to create a material similar in consistency to mud or plaster of Paris.
 
Trunnion – Upper and lower supports used to keep the ball under pressure.
 
Valve Seat – A stationary part of the valve which restricts fluid or gas flow when it comes in contact with the movable portion of the valve.