ANSI Valves -
Trunnion Ball
Valve
Construction
feature
Design and
Manufacture: API 6D, BS5351, ASME B16.34
API 608, MSS-SP-72
Face to Face
Dimension: ASME B16.10
End flange dimension:
ASME B16.5(for NPS≤24); ASME B16.47 series B,
API 605 or ASME
B16.47 series A, MSS SP-44(-for NPS≥24)
BW Connection
Dimension: ASME B16.25
Test And Inspection:
API 598
Fire-safe Design: API
607/6FA
Anti-static Design &
anti Blow-out Stem
Construction feature
According to
customers' requirement, the trunnion ball valves
are provided with devices for urgent grease injecti-on,
which are on both the stem and seat for the trunnion
ball valves of DN>150mm (NPS6), and in the body
cavity for the valve of DN<125mm. When the O ring of
stem or the body seat ring is damaged due to
accident, the medium leakage between body and stem
can be prevented by injecting the sealing grease
through the device.
Construction feature
Each seat of the ball
valve can separately cut off the medium at both
inlet and outlet of the valve to realize
double-block functions. When the ball valve is
closed, body cavity and two of the body ends can be
blocked with each other even if both the inlet and
outlet are under pressure, when the medium left
in the body cavity might be bled through the relief
valve.
Construction feature
Blow-out proof
structure is provided with for the stem, which is
positioned by the up-end cap and screw, being
guaranteed not to be blown-out by the medium
even if at
abnormal risen pressure in the cavity. |