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API Specification 6D Twenty-second Edition - Introduction |
6.4 Minimum-bore full-opening
valves
Minimum bores for full-opening valves shall not
be less than those specified in Table 1.
6.5 Valve operation
The purchaser should specify the
maximum pressure differential (MPD) at which the
valve is required to be opened by the lever,
gearbox or actuator. If not specified, the
pressure rating
as determined in accordance with 6.1 for
material at 38°C (100°F) shall be the MPD.
The manufacturer shall provide the following
data to the purchaser:
the flow coefficient Kv;
the breakaway thrust or torque for new valve;
the maximum allowable stem thrust or torque on
the valve and, if applicable, the drive train.
6.6 Pigging
The purchaser shall specify the requirements for
piggability of the
valves. Clause A.4 may be used to assist.
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