2. Use an appropriate high pressure grease-injection pump, capable of overcoming the pipe pressure and
the high pressure build-up caused by the grease itself, during it’s injection in the grease passages.
3. Inject a generous amount of grease in the seats before flushing. The object is to cover them all and to
fill the groove between seat carrier and ball with grease. The dirt will get stuck to the grease during
flushing, but it will not come inside. And before turning the valve for the first time, inject again a small
amount of grease into the seats. A little is enough (1/4 of the normal quantity per seat, see 8.4.1). The
dirty grease will be pushed into the pipe by the fresh grease, and the turning action of the ball will
drag fresh grease towards the seats, not dirty grease.
4. Do not turn the valve during flushing.
2.5 MAINTENANCE POST FLUSHING
a- At the end of flushing operation it may be possible to leave the line full of test fluid and in this case no
intervention is required. If the line must be drained proceed as follows:
• Make sure that the valve is in full open position.
• Open plugs and drain it completely. Observe safety plant procedures prior to opening any body plugs in
case any remaining fluid or gas is pressurised or trapped in body cavities.
• After draining flush the cavity of valve through the vent plug. Consult an expert on use of special
excavation procedures.
• Lubricate the stem with fluid protective oil or grease through the injector (if applicable). (Seat
lubrication is normally only required for emergency purposes not for ongoing maintenance).
• Completely tighten all drain and vent plugs. Consult your plant safety procedures and only perform
work under supervision of expert valve maintenance personnel.
b- Operate the valve at least 2 times (complete closing and opening operation).
c- Repeat the operation every 6 months if the pipeline is not used.
d- Always get authorisation to partially operate an in-service valve.
Personal injury may result from sudden release of any process pressure. APV
recommends the use of protective clothing, gloves and eyewear when performing
any installation or maintenance. Isolate the valve from the system and relieve
pressure prior to performing maintenance. Never unscrew sealant injection nipples
from body, seats or stem as these outlets are exposed to full line pressure and only
the in-built check valve in the sealant nipple itself isolates the pressure. Similarly,
the body drain and vent valve plugs are exposed to full line pressure if opened.
Disconnect any operating lines providing air pressure, control signals or electrical
power to actuators.
Australian Pipeline Valve - Installation, Operation and Maintenance Manual
9
SIDE ENTRY 3P TRUNNION BALL VALVES API6D STANDARD - BVF100 SERIES
Note
Do not operate the valve during flushing or entrained particulates could damage
soft seat or enter stem or seat pocket area.
