Please visit www.SVF.net for the latest updates on this document. All data posted on our website supersede all prior publications • [Document #SVF Series FB9 IOM - 01/6/2020]
IOM - Series FB9 Ball Valves
INSTALLATION
The valve may be installed for flow or vacuum in
either direction. Carefully exclude pipe sealants
from the valve cavity. When installing, use standard
gaskets suitable for the specific service. Tighten
flange bolts or studs evenly.
OPERATION
normal conditions and in accordance with SVF’s
published pressure/temperature chart. If these
valves are used in a partially open (throttled)
position seat life may be reduced.
SVF valves have ¼ turn operation, closing in a
clockwise direction. It is possible to see when
the valve is open or closed by the position of the
wrench handle. When the wrench is inline with the
pipeline, the valve is open.
Any media which might solidify, crystallize or
polymerize should not be allowed to stand in the
ball valve cavities unless regular maintenance is
provided. If minimal maintenance is required, SVF
TORQUE REQUIREMENTS
Torque ratings are subject to variations depending
on the length of time between cycles and the
media in the system.
Breakaway torque is that force which must be
exerted to cause the ball to begin to open.
Operating torque requirements willvary depending
on the length of time between cycles, media in
the system, line pressure and type of valve seat.
MAINTENANCE
With self-wiping ball/seats, SVF valves have a
long, trouble free life, and maintenance is seldom
required.
SVF valves are designed for easy service and
assembly in the field. The following checks will help
to extend valve life, or reduce plant problems.
SVF ball valves utilize live-loaded stem seals
featuring Belleville Washers (disk springs) that
maintain constant pressure on the Stem Seal
area even under a wide range of pressure and
temperature fluctuations. If stem leakage is evident
proceed as follows:
STEM LEAKAGE
Examine the disk springs (Belleville washers) for
damage. If in good condition tighten the stem
nut until disk springs are rmly compressed,
th of a turn. If damaged,
dismantle the stem down to the stem nut, fit
new disk springs with their outer edges touching,
replace and retighten using the stem nut. Further
maintenance necessitates dismantling of the
valve.
LEAKAGE AT BODY JOINT
Check for tightness at the body connector bolts.
If loose, tighten body bolts. Excessive force will
damage the bolts. (See Table A below)
If there is still leakage it will be necessary to
dismantle the valve and replace the body seals.
IN-LINE LEAKAGE
Check that the valve is fully closed. If leakage
occurs while the valve is in the closed position,
a seat or ball sealant surface may be damaged
and it will be necessary to disassemble the valve.
NOTE: If stem leakage and leakage at the body
joint are not cured by simple means described
above, it will be necessary to dismantle the
valve. If there is no stem leakage the stem
assembly should not be touched.
WELDING OF SERIES FB9 VALVES:
1. Place valve in the OPEN position.
2. Align the valve between the pipe ends and
make the appropriate welds according to
standard welding procedures. NOTE: The body
temperature in the seal area must not exceed
392 OF.
3. Allow the valve to cool.
4. Tighten the body bolts according to the torque
values (Page 4, Table A).
2
INSTALLATION, OPERATION & MAINTENANCE FOR SVF SERIES FB9 BALLVALVES
