Australian Pipeline Valve - Installation, Operation and Maintenance Manual
10
FLOATING BALL VALVES - BV100 SERIES
and centre pieces. You can still use disassembly method 2.4.1 above provided you have 3mm of line
movement. APV will supply spare body gaskets where required. If you do not disassemble the valve, do
not attempt to weld valves under 50 NB (2”) that do not have pup ends unless you are using water cooling
and monitoring the temperature.
For pup end valves and valves 50 NB (2”) and over with short ends there is no need for disassembly,
valves can be welded straight in line. There is no need to keep cool but if valve does not have extended
long ends it still pays to ensure that the valve body near seat and body seal area remain below 150°C
especially for valves 80 NB (3”) and smaller.
The responsibility for welding of the valves into piping systems is that of those performing the welding.
Refer to ASME B31.1, B31.3 etc. Written welding procedures covering all attributes of the process and
materials to be welded shall be in accordance with Section IX of the ASME Boiler and Pressure Vessel Code
and any additional requirements from the applicable piping code including any possible necessary
localised post weld heat treatment depending on material specifications.
3 . 0 O P E R A T I O N
3.1 MANUAL OPERATION
Valve adjustment is by clockwise turning of stem. Lever operated and gear operated valves have a
position indicator to indicate open or closed (see figure 1). Ball Valves must not be used for throttling. Do
not leave part open, or seats will be damaged. Valve must be full open or full closed or damage to seats
or body will occur.
FIG 1.
3.2 LOCK DEVICE
Where provided (optional) the valve has a locking lug that allows valve to be locked in full open or full
closed position.
4 . 0 M A I N T E N A N C E
Valves should be periodically checked at least once every 3 months, but depending on service, criticality
and frequency of use, more regular checking may be required.
