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Note: Information subject to change without notice.
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valve is open. If the handle is at right angles
to the pipeline, the valve is closed.
b. When the valve is operated with
removable handle, the user should ensure the
position of the valve, whether open or closed.
There is a mark at the top of stem for double
“D” type stem. Refer Fig 1 below showing how
to determine the valve’s position.
Fig-1
3. Maintenance
3.1 Maintenance frequency
The maintenance frequency is determined
by the valve’s application. User shall consider
the time interval depending on fluid, flow
velocity, operational frequency, high-pressure
effect and high-temperature effect etc. Valves
should be operated at a minimum twice a
year.
3.2 Disassembly
a. To disassemble the valve, please follow
the procedure and drawings below.
1) Turn the valve fully open. Loosen No.
16-1 and 18, remove No. 14 handle and
No. 15 flat washer.
2) Use pincer to take off snap ring. Turn
ball until half open. Remove No. 12 stop
plate.
3) Remove No. 11-1 gland bolts., remove
No. 10 gland flange.
4) Remove No. 17 Bolts using a ring
spanner. Remove No. 2 cap.
5) Take No. 6 body seal and No. 3-2 seat
out. Fully close ball and remove No. 4
ball and 3-1 seat.
6) Take No. 5 stem out by pushing No.
5 stem downward. Remove No. 8 stem
packing and No. 7 thrust washer.
7) Do not remove No. 19 & No. 20. Static
devices.
b. It is necessary to open the ball slightly
to drain the body cavity slowly. Be aware of
media trapped in the body cavity and take
necessary precautions for safe handling and
protect against exposure.
c. The ball cannot be taken out from valve
body if the ball is in the open or semi-open
position. The correct position to work on the
valve is with the flange end down.
d. To separate the valve body and cap,
undo the bolts symmetrically.
e. During and after assembly/disassembly,
take precaution not to damage the surface of
the ball.
3.3 Parts inspection, maintenance, and
replacement:
a. Check the surface of ball for marks.
If there is any damage on the surface, find
out the root cause such as dirt, fluid…etc. It
is important to avoid these damage factors
wherever possible.
b. If the ball surface is damaged at the
contact area of ball and ball seat the ball must
be re-surfaced. If it is damaged heavily, and
cannot be repaired, a new ball must be fitted.
c. Inspect the surface of soft seats, and
replace if any damage or deformation is
evident.
d. The stem seal must be replaced after
disassembling the valve.
e. Repair kits are available by contacting
Jomar.
