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Ball valves are quarter turn valves that have a round closure element
with matching rounded seats that create a tight seal
Ball valves are great for shut off applications
They are also very versatile
being able to transfer gases
liquids and slurries
Ball valves are available in a variety of body styles
including one piece, two piece and three piece flanged body construction 10. 00:00:47,002 --> 00:00:50,002 Each of these ball valves offer specific advantages
depending upon the requirements of the given application
One piece ball valves are almost always reduced bore
and a relatively inexpensive
and generally are disposable
Two piece ball valves are generally slightly reduced or standard bore
They may be either disposable or repairable
The three piece design allows for the center part of the valve 00:01:18,090 --> 00:01:22,065 containing the ball, stem, and seats
to be easily removed from the pipeline
This allows efficient cleaning of the ball and other interior components
All this without removing the pipes from the valve body
The design concept of the three piece valve is
for to be repairable
A full port ball valve
has an oversized ball so that the hole in the ball
is the same size as the pipeline
resulting in lower friction loss,
flow is unrestricted but the valve is larger
A standard or reduced port ball valve
has a smaller ball and a correspondingly smaller port
The port through the ball
is one pipe size smaller than the valve's pipe size
resulting in slightly restricted flow
The process flow will vary depending on the port arrangement
A two-way ball valve can either be set up as a straight through or with an L-type port
A straight through valve has one inlet and one outlet port
The process flow does not change directions through the valve
When the handle is parallel with the pipes the valve is opened
When it is perpendicular, it is closed
The L-type two-way valves have one inlet and one outlet port
However
the flow will change direction at the valve
Three-way ball valves have an L
or T-shaped hole through the middle
This allows for options in the direction of flow
The L-type flow would be either closed or through the inlet and out of pipe 1
or pipe 2
The T-type flow can be closed
open and flowing out of pipe 1
open and flowing out of pipe 2
or flowing out of both pipes