Top entry trunnion ball valves trunnion mounted design, soft
seated. The ball, seat rings and other trims shall be inserted into
the valve cavity from the top first. Then, the bonnet, with the
stem in place, is bolted to the valve body. Gaskets are employed to
prevent leakage at the body-bonnet joint. A top entry trunnion ball
valve can be conveniently maintained by removing the bonnet,
without removing the valve from the pipeline. Compared to the split
body side entry ball valves, it eliminates the possible leakage
from body joints.
Design features and material selection
Top entry ball valves uses trunnion-mounted balls and spring-loaded
seats, the ball has either integral or separate lower post that is
seated in the bottom of the body. The seats are placed on both
sides of the ball and the entire assembly is placed in the body.
The top-works, consisting of a bonnet cap, packing box, gland
flange, and separate stem, are installed above the ball. When the
bonnet-cap bolting is tightened, the resulting compression
energizes the seats. The joint between the bonnet cap and the body
is sealed using gaskets.
API 6D, ISO 17292 ASME B16.34; Fire safe to API 607, API 6FA, ISO
10497; End connection: ASME B16.5, ASME B16.25, ASME B16.11;
Inspection and test: API 598, API 6D, EN 12266-1. The top entry
trunnion ball valve is generally designed to full port(FB), 1 piece
unibody, lever/gear or actuator operated. Size range: 1-1/2″ ~ 24″;
Pressure ratings: 150LB~2500LB.
(Larger sizes available on application)
Design Data and Features