Welded Ends Full Welded Ball Valve

Applicable Standards

Valve Design: API6D

Size Range: 0.5” (12 mm) to 56” (1400 mm)

Pressure Ratings: ANSI 150 to 2500

Temperature Range: -50°F to 500°F | -46°C to 260°C

End Connections: Flanged or welded ends

Depending on design: Removable stem  seals under full line pressure in open  or closed position

Features: trunnion mounted design, Anti blow-out stem, Full or reduced bore, Fire Safety

Trunnion Mounted Ball Valves

The ball is fixed and the seat rings are floating, free to move along the valve axis. Side load generated by pressure acting on the ball is absorbed by bearings. At low pressure the seat sealing acting is achieved by the thrust of the springs acting on the seat. As the pressure increases the fluid pressure pushes the seat rings against the ball, making the sealing more reliable.

Independent Ball and Stem

\The ball and stem are independent components to minimize the effect of the side thrust generated by the pressure acting on the ball to minimize the valve operation torque.

Emergency Stem and Seat Sealant Injection

In case of emergency, when sealing materials (seat sealing and stem o-ring) are damaged or decomposed by fire or other accidental causes, a sealant injection into fittings on both stem and seat prevents leakage until the primary seal is restored.

Seat Seal System

The full welded ball valves provide spring supported seats as a standard. The seats are pressed against the ball surface by spring elements and ensure a tight shut-off at  low line pressure. In addition the sealing effect is assisted by the pressure in line. So the total sealing force is the sum of the spring force and the force resulting from  the pressure which increases proportionally with the line pressure.