220/6 Baywater Drive, Wentworth Point, NSW 2127.

Ball Valves

Ball valves are simple valves that are used as a shutoff valve or flow metering valve. Ball valves are quarter-turn, straight-through valves that have a round closure element with matching rounded seats that permit uniform sealing stress. The valve gets its name from the ball that rotates to open and close the valve. Ball valves are used in situations where tight shut-off is required. They are wide duty valves, able to transfer gases, liquids and liquids with suspended solids.

Essentially a ball valve is composed of an outer shell, a ball with a hole in it, and an actuator such as a handle.
Ball valves are available in a variety of body styles, including reduced bore, full bore and V-notch. Each of these ball valve forms offers specific advantages depending upon the requirements of the given application. Ball valves can come in a variety of styles to ensure proper function in the system.
  • Reduced port valves have an opening that is smaller than the diameter of the piping. The media flow through the valve is limited to 75%. Reduced port valves have higher pressure drops.
  • Full port valves have a ball with a bore equal to the inside diameter of the pipe. The advantage to this design is they minimize the pressure drop across the valve and keep the flow from being restricted as it flows. They can be used for throttling applications.
  • V-notch control valve bodies have a similar construction to standard ball valves. The difference lies in the contoured V-notch in the ball, which produces an equal-percentage flow characteristic. They have good range ability, control, and shut off capability for use in the paper industry, chemical plants and power industry. The ball remains in contact with the seal during rotation and produces a shearing effect as the ball closes to minimize clogging.
Ball valve bodies can also come in three configurations depending on the installation and maintenance requirements of the system.

One Piece:

One-piece ball valves are installed as a unit. The retainer holds the ball and seal. Compression of the seal is controlled by increasing or decreasing the tightness of the threading holding the retainer. A one-piece ball valve must balance the integrity of the seal against the friction between the ball and seal. If the retainer fails to secure the entire seal, the pipe forces will be uneven and the seal will wear unevenly.

Two Piece:

Two-piece ball valves allow for easier assembly. The body is split into two pieces and the configuration uses a floating ball. The two body pieces are combined with a flange and bolts. This design makes servicing the valve easy and the procedure can be done in-line.

Three Piece:

Three-piece ball valves offer easy and fast access for valve maintenance. The three-body connector can be removed and the fourth can be loosened to allow the body to swing away to carry out installation or maintenance.

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