Showing posts with label Flo-Tite. Show all posts
Showing posts with label Flo-Tite. Show all posts

What Are Industrial Ball Valves?

Internal view of a ball valve
Internal view of a ball valve
(MOGAS)
Ball valves are defined by their body style, the five major styles being: Uni-body; 3-piece; split-body; top-entry; and welded body. They are further defined by the machined hole in their ball (also known as the port); the categories being "standard port" or "full port".

On a full port valve, the port is the same size as the pipeline, resulting in a better flow profile and no restriction or pressure drop. A full ported ball valve, with better flow coefficients, comes at a higher price. In many application they are necessary because a reduction in diameter, or the resulting change in flow, can be detrimental.

The reduction in a standard port valve is one pipe size smaller than the pipe connected to the valve, resulting in restricted flow and increased velocity through the valve.

2-piece and unibody ball valves
2-piece and unibody ball valves (Flo-Tite)
Standard port and full port valves are not usually recommended for throttling service due the a very
non-linear flow characteristic. Characterizing the port with a special shaped orifice can improve the valve linearity and provide good control. V-port ball valves incorporate a machined "V" in the seat around the outlet side of the valve. The "V" provides a more controllable flow pattern and is desirable when ball valves are used as control valves.

A cavity filled ball valve is used in applications where cleanliness or sanitary conditions exist. Any voids, gaps or spaces between the ball, seat and stem that allow bacteria or contaminates to accumulate are filled.  The proper cavity filler material is selected consistent with the process media, application and level of cleanliness required. Cavity fillers eliminate the spaces and voids where contaminants accumulate and provides easy "flushing" (cleaning) of the valve.

In a trunnion mounted ball valve, the valve stem is mechanically attached to the ball. Trunnion mounted valves are mostly used in applications on large diameter gas and oil pipelines and at high pressures.

Most ball valves however, are designed with a “floating ball” and not held mechanically in place by a trunnion. This allows the ball to be "pushed" slightly downstream and seal itself better against the seat. One advantage to this design is that a valve using a floating ball, and fitted with metal seats, can be used for "fire-safe" applications. This means that if the valve is subject to high temperatures, such as those presented in a fire, the "soft" part of the seat will melt away, and allow the ball to secure itself against the metal seat, and thus not allow material to pass and potentially feed the fire.

For best service life and optimum safety, please review your application with a qualified ball valve applications consultant prior to specifying an industrial ball valve.

7 Reason to Choose Full Flanged, Full Port, Wafer Style Valves

Abstracted from an article by Robert Donnelly of Flo-Tite.
  1. Space Savings - Shorter in width than a standard flanged ball valve, the wafer-style ball valve
    Full Flanged, Full Port, Wafer Style Valve
    Flo-Tite Kompact Series Valve
    is ideal for skid systems or any application where space is an issue. Ideal for under tanks too.
  2. Lower Torques - With less torque than other con­ventional full-port valves, the wafer valve can be automated by smaller actuators with smaller universal mounting kits.
  3. Less Weight - The wafer valve weigh­s about 30% less than full-port flanged ball valves.
  4. One Piece Body - If steam jacketing is required, the jackets cost much less than two-piece bolt-on types. 
  5. Pocket-less Design - Many process control engineers will not use ball valves because of the dead space behind the valve ball. The pocket-less design of the wafer valve eliminates that concern.
  6. Easier to modify flanges to meet standards - When equipment made in Europe is sent to U.S. there is often a need to tran­sition from the DIN flange to an ANSI interface to install the equip­ment here. With the wafer valve, it is relatively easy to modify the flanges to mate.
  7. Tapped flanges - Adds to the ease of installation or maintenance as one side of the piping can be re­ moved while the valve is still under pressure.

For more information on Full Flanged, Full Port, Wafer Style Valves contact Piping Specialties, Inc by calling 800-223-1468 or visit http://www.psi-team.com.