Question 1

What is a floating ball valve?

Accepted Answer

It is a valve where the ball is not mechanically fixed by shafts but "floats" freely between the two seats. Fluid pressure pushes the ball against the downstream seat, creating the seal. Its simple, compact design makes it economical and suitable for diameters from 1/2" to 12" and pressures ANSI 150 to 600.

Question 2

What is the difference between a floating and a trunnion ball valve?

Accepted Answer

In a floating design, the ball moves freely and fluid pressure creates the seal; in a trunnion, the ball is fixed by upper and lower shafts and the seats move against the ball. Floating is ideal for smaller diameters and low to medium pressures; trunnion is necessary for large diameters (>6") and high pressures where force on the ball would be excessive.

Question 3

When should I use a floating ball valve?

Accepted Answer

Recommended for auxiliary lines, drains, vents, general services, instrumentation, and applications requiring quick, economical shutoff in diameters from 1/2" to 12" with pressures up to ANSI 600. It is also the ideal choice for mass modernization projects replacing dozens or hundreds of valves.

Question 4

What standards apply to floating ball valves?

Accepted Answer

The main standards are API 6D for pipeline valves, ISO 17292 for metal ball valves, API 607 for fire testing, and ASME B16.34 for pressure-temperature design. For cryogenic service, BS 6364 additionally applies.

Question 5

What materials are available for floating ball valves?

Accepted Answer

The most common materials are carbon steel (ASTM A216 WCB), stainless steel (CF8M/316), duplex (CD3MN), and special alloys like Inconel and Monel for corrosive service. Seats can be PTFE, RPTFE, PEEK, or metallic depending on the temperature and service fluid.

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