Floating ball valve is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball (called a floating ball) to control flow through it.
The floating design utilizes natural line pressure to press and seal the ball against the downstream seat. The ball is suspended in the flowing medium (floating) held in position by the compression of the two seats against 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. Floating ball valves are durable, performing well after many cycles, and reliable, close securely even after long periods of disuse.
These qualities make them an excellent choice for shut off applications, where they are often preferred to gates and globe valves. The valve’s ease of operation, repair, and versatility lend it to extensive industrial use.
Floating ball valve design is capable of bi-directional shut off.
As the size of the valve bore increases, the area subjected to the line pressure also increases. This has the effect of increasing the force acting on the ball.
There comes a critical point where it is no longer possible for the seats to support the ball and it is necessary consider a different design: floating ball valves are in general not intended for large size and high-pressure applications. Floating ball valves are not suitable for throttling purposes.
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Applicable standard range
SIZE : From NPS 1/2 TO NPS 8 or From DN 15 TO DN 200
CLASS : From ASME 600 to ASME 2500.
Design : ISO 17292 , API 608 , ASME B16.34
Inspection & testing : API 598
Marking : MSS SP-25
Rating : ASME B16.34 With possible derating for high temperature based on seat material.
Fugitive emission : ISO 15848
Applicable end finishes
Face to face : ASME B16.10
End to end : Manufacturer standard or ASME B16.10
Socket weld : ASME B16.11
Screwed ends (NPT) : ASME B1.20.1
Flanged ends : ASME B16.5
Butt welding ends : ASME B16.25
1). Standard Swing-out body design for class ASME 800 class products.
2). Full die forged structure for all pressure containing parts.
3). Flanged valves are provided with flanged integral with closure member.
4). Standard primary gasket design is OR AED type, secondary emergency seal always provided for fire-safe purpose.
5). High quality stem gasket for reliable tightness and low emission performance.
6). Use of low seat-ball friction materials and surface finish for reliable sealing and long service life.
7). Best-in-Class CV values.
8). Standard split & bolted design for body-closure connection.
9). Low operation torque design.
10). Static conduction spring is used as standard between the stem and the ball (Antic-Static Device).
11). Anti blow-out proof stem design.