A Ball Valve is a form of
quarter-turn valve which uses a hollow, perforated, and pivoting Ball to
control flow through it. It is open when the ball's hole is in line with the
flow and closed when it is pivoted 90-degrees by the valve handle. The
handle lies flat in alignment with the flow when open, and is perpendicular to
it when closed, making for easy visual confirmation of the valve's status.
A Ball
Valve is a form of quarter-turn valve which uses a hollow, perforated, and
pivoting Ball to control flow through it. It is open when the ball's hole is in
line with the flow and closed when it is pivoted 90-degrees by the valve
handle. The handle lies flat in alignment with the flow when open, and is
perpendicular to it when closed, making for easy visual confirmation of the
valve's status.
Three-Piece Design Ball Valves:
A Ball Valve is a
form of quarter-turn valve which uses a hollow, perforated, and pivoting Ball
to control flow through it. It is open when the ball's hole is in line with the
flow and closed when it is pivoted 90-degrees by the valve handle. The handle
lies flat in alignment with the flow when open, and is perpendicular to it when
closed, making for easy visual confirmation of the valve's status.
Characteristics of Ball Valves:
Ball Valves are hard-wearing, performing
well after many cycles, and reliable, closing securely even after long periods
of disuse. These qualities make them an excellent choice for shutoff and
control applications, where they are often preferred to gates and Globe Valves,
but they lack their fine control in throttling applications.
Two-Piece Design Ball Valves are hard-wearing, performing
well after many cycles, and reliable, closing securely even after long periods
of disuse. These qualities make them an excellent choice for shutoff and
control applications, where they are often preferred to gates and Globe Valves,
but they lack their fine control in throttling applications.
Three Piece Design Ball Valves are hard-wearing, performing
well after many cycles, and reliable, closing securely even after long periods
of disuse. These qualities make them an excellent choice for shutoff and
control applications, where they are often preferred to gates and Globe Valves,
but they lack their fine control in throttling applications.
Uses of Ball Valves:
Ball valve's ease of operation,
repair, and adaptability lend it to extensive industrial use, withstanding
pressures up to 1000 bar and temperatures up to 752 °F (400 °C), depending on
the design and raw materials used. Sizes typically range from 0.2 to 48 inches
(0.5 cm to 121 cm). Valve bodies are made of metal, plastic, or metal with a
ceramic; floating balls are often chrome plated for durability. One
disadvantage of a Ball valve is that they trap water in the centre cavity while
in the closed position.
In cold climates, the sides can
crack due to the expansion of ice forming. Some means of insulation or
heat tape in this situation will usually prevent damage. Another option for
this situation is the "freeze tolerant Ball valve". This style of Ball
valve incorporates a freeze plug in the side so in the event of a freeze-up,
the freeze plug ruptures (acts as a sacrificial disk), thus making for an easy
repair. Now instead of replacing the whole valve, just screw in a new freeze
plug.
Materials use in Ball Valves Manufacturing
- Bronze (CAC401, CAC406)
- Brass (C3771)
- Gray cast iron (FC200, FC300)
- Ductile iron castings (FCD-S)
- Carbon steel castings for high
temperature/pressure service (SCPH 2)
- Stainless steel castings (SCS13A, SCS14A)
Reference by
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