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Ball Valves: How Do They Work & Their Types

May 26, 2022 by Sonam

Ball Valves

Ball Valves: For clean gas, compressed air, and liquid services, a ball valve can be used. It is used for controlling the flow of liquid or gas. They may also be utilized for slurry service, although special precautions must avoid crud build-up. Nylon, Delrin and synthetic rubbers, and fluoropolymers provide good sealing properties. When using fluorinated seats of polymer, ball valves may be used up to 270 C in service, while graphite seats can be used up to 538 C or more heightened. You may also use them in fire-safe assistance because of the metal backing seats. Ball valve functions similarly to plug valves. They don’t bind and have a watertight seal. They have a low flow resistance due to their smooth bodies and ports.

Table of Contents

  • A Ball Valve’s Construction
  • Variety of Ball Valves
    • Ball Valve with a Split-Body
    • Ball valve in a double trunnion
  • Conclusion

A Ball Valve’s Construction

The body, seats, and plug are the most critical parts of the ball valve. Venturi port, full port, and reduced port are all ball valve types. Internally, the full-port valve has a diameter identical to the pipes. The port size is typically one pipe size less than the line size in the venturi and reduced-port forms of filtration. A lubricant-sealing system comparable to plug valves is also available for valves.

Depending on the number of valve seats and ports, a ball valve can be bidirectional, unidirectional, or multidirectional. Due to the amount of ports available, ball valves are referred to as multi-port valves ranging from 2 to 5 ports. A two‐way ball valve with singular seats will be unidirectional when the direction of flow is specified. If the flow must reach a particular port, even a three-way, four-way, or five-way ball valve may be unidirectional. An upstream and downstream seat on a bidirectional ball valve is called an upstream seat and a downstream seat. To reduce the number of valves required, multiple-port ball valves allow for flow in more than one direction.

Variety of Ball Valves

Types of the ball valve are described in the following paragraphs:

Ball Valve with a Split-Body

Parts of the split-body design include a stem and other internals and the two-part body. A flange joins the two parts of the body. The size of one portion of the body is different from the other. The smaller body portion is assembled by bolting it to the more extensive body section. The filling box is built-in as part of the more significant body component. The threaded connection joins the two halves of the body on a smaller split-body ball valve. Additional leakage points include the two-part body’s flanged or threaded junction.

Ball valve in a double trunnion

The bottom and top trunnions of this ball-valve configuration are built into the ball and function as short-shaft expansions. When the shaft in the top trunnion is twisted to open or shut the valve, these trunnions revolve freely. Other designs allow the ball to float in the direction of the slot on the top of the ball, but this design keeps the ball securely in place. A shaft fitted in the top space must be rotated to open or shut the valve.

Conclusion

Most valve stems are sealed with O-ring closures and bolted stuffing glands. Lubricant-seal systems comparable to plug valves are available for certain valves. There are lubricated ball valves and non-lubricated ball valves, both of which include seal systems that are lubricated.

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Filed Under: General Tagged With: #BallValves

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