JAG
flocomponents FB2 IOM
2012
Page
4
of
8
www.JAGvalve.com
JAG.FB2.IOM.Rev.0
5.2
In-Line Testing
Do not leave valves in the half open position
as this could result in damage to the soft
seat.
Ensure that after welding (if applicable) all
valves are flushed out and left in the fully
open or fully closed position.
The valve is now ready for line testing.
Ensure that after testing all valves are
flushed out and left in the fully open or fully
closed position.
SECTION 6 - OPERATION
6.1
Operation
JAG
flocomponents (manual operation)
floating ball valves are operated by a simple
quarter turn of the stem to the fully open or
fully closed positions against the stops.
The valve position is indicated by the stem
flats and / or handle.
When the stem flats and/or handle is
in line
with the pipeline
the valve is in the
fully
open position
. When stem flats and/or
handle are
at right angles to the pipeline
the valve is in the
fully closed position
.
Floating Ball Valves contain two seats.
Each seat is made of RTFE or similar
material.
The valve seals by pressure in the line
pushing the ball into the opposite seat
ensuring a positive seal on the outlet sides
of the valve.
As more pressure is applied a tighter seal is
formed.
If the valve is provided with a gear, the
position stops that are located in the manual
gearbox are adjusted and factory set to give
true alignment in both the open and closed
positions.
JAG
flocomponents recommends that the
position stops should not be tampered with
as it may affect the operational efficiency of
the valve.
The valve closes in a clockwise direction.
Where manual operation is not required an
actuator may control the valves.
Actuator operation shall be in accordance
with the actuator manufacturers
Installation, Operation and Maintenance
Instruction.
Note: Like any other piece of precision
machinery,
JAG
flocomponents ball valves
should not be immobilised for long periods of
time. Where possible, the valve should be
cycled at periodic intervals to ensure
continued correct operation.
Tight closure valves are intended to be
either FULLY OPEN or FULLY CLOSED.
Leaving the ball in some intermediate
position can rapidly cause severe damage
and / or failure.
SECTION 7 - MAINTENANCE
7.1
Maintenance
All
JAG
flocomponents floating ball valves
are designed with an anti-blow out stem.
JAG
flocomponents floating ball valves do
not require lubrication.
Maintenance is seldom required.
If necessary, the valves may be refurbished
by relatively unskilled labour using a small
number of parts, none of which require
matching on site.
The only parts likely to require attention are
Ball, Seats, Stem, 'O' Rings and Fire Safe
Seals.
JAG
valves are designed for ease of service
and assembly in the field. The only
preventative maintenance recommended is
to periodically inspect the valve for leaks
around the stem. Should a leak be noticed,
the following procedure is for adjusting the
packing.
Stem Packing Adjustment -
Remove the nut and handle from valve.
Bend up the lock washer and snug up the
nut in a clockwise direction. Once complete
bend back lock washer and replace handle
and nut.
Leakage at Body Joint: This is invariably due
to damage to the cap seal and it will be
necessary to dismantle the valve.
In-Line Leakage: Check that the valve is fully
fully closed. If the valve is fully closed, then
leakage will be due to damaged seat or ball
sealing surface. Further maintenance on