SIDE ENTRY 2P TRUNNION BALL VALVES API6D STANDARD - FS9000 SERIES
Australian Pipeline Valve - Installation, Operation and Maintenance Manual
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A P P E N D I X 3
Design Features
MANUFACTURING SPECIFICATIONS
Specification
Standards
General design standard
API 6D
Pressure-temperature rating
ASME B16.34
Face to face dimensions
ASME B16.10
Flange type and dimensions
ASTM B16.5
Butt-weld ends
ASME B16.25
Inspection and test
API 6D/API 598/ISO 14313
DIAGRAM 3
APV Trunnion Mounted Ball Valve Construction Features Function
Up-stream Sealing Two-way Valve
Down stream
Up stream
The up-stream seal of the valve is effected by the advanced spring
pre-tightening seats which automatically adjust. The two-way valve
has two seats that can be sealed in both directions, so there’s no
limitations of flow direction during installation. As line pressure
increases the seat reacts to the force of the pressure to form an
effective seal. In the absence of line pressure, coil springs around the
seat unit provide a tight seal by keeping the seat in contact with the
ball.
DIAGRAM 4
Double Block & Bleed Valve
Down stream
Up stream
Being “up-stream side sealing”, the valve can bleed out the trapped
fluid in the body cavity when the valve’s in fully open or fully closed
position. The fluid is intercepted by seats on up-stream and down-
stream side. Bleeding the dirty fluid periodically can reduce
damage of the sealing surface and prolong the service life of the
valve. Once the integrity of the cavity is ensured, the upper stem seal
may be replaced under working pressure. However, this depends on
the size and class as designs vary. Also prime the stem sealant nipple
with emergency sealant before attempting to replace the upper seal.
DIAGRAM 5
