FLOWSEAL
3201 Walnut Avenue, Long Beach, CA 90807
562/426-2531
FAX 562/490-9546
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Remove any actuator and mounting bracket from top of
valve.
Remove all top and bottom packing and/or end seals as
required.
To prepare for removal of existing wedge pins, grind away
any disc material that has been peened over pin heads.
(a) For Through Shaft Design:
(b) For Split Shaft Design:
Support the valve body and disc on a flat surface in the
horizontal position. Slowly remove shaft(s).
Remove the disc from the body.
To remove bearings, cut or grind a slot lengthwise in each
bearing in order to be able to collapse bearing prior to
removal. Be careful not to damage bearing seating bore
within the body.
Clean all components thoroughly.
Inspect all parts for damage prior to reassembly. Dam-
aged parts should be repaired or replaced with new parts.
Carefully clean and polish the disc sealing surface with a
soft cloth. The disc sealing surface should be free of all
grooves and scratches.
Install the new bearings by gently tapping them into the
body with a soft rod and hammer. The bearings should be
installed into the shaft bore firmly against the counterbore
or bottom of shaft hole.
(a) Valves 2" thru 12":
(b) Valves 14" and larger:
The shaft keyway when viewed from the top of the valve
should be to the right, which is also the direction from
which the pins are installed.
Follow Steps 1 and 2 of Soft Seat Replacement instruc-
tions.
Remove old soft seat and graphite gaskets and discard.
Clean and inspect the metal seat.
If metal seat is scored, bent or otherwise damaged it will
require replacement.
Thoroughly clean the seat cavity in the body and the seat
retainer prior to installing the new seat.
Carefully clean and polish the disc edge sealing surface
with a soft cloth. The disc sealing surface should be free of
all grooves and scratches.
A graphite gasket is required on both sides of the metal
seat. Gaskets can be made from self-adhesive graphite
tape as follows:
(a) Suggested graphite tape size:
2" - 12" valves –
1
/2" wide
14" - 48" valves – 1" wide
(b) To install the tape, peel off 6" of backing paper at a
time. Apply the tape to the metal seat covering the
flat outer edge area on both sides. Overlap the two
ends of the tape a minimum of
1
/8 inch.
Note:
It is important that both sides have gaskets.
(c)
(d) If cap screw retainer design, bolt holes in metal seat
should be opened by slitting an “X” in the hole. Do
not attempt to cut round holes.
For Fire-Flow valves, place the preformed seat assembly
in the body seat cavity with the marked (tape) side up. For
metal seated valves, place the 316 SS back-up ring in the
body seat cavity.
Place the metal seat with graphite gaskets on the TFE seat
or 316 SS back-up ring already in the body. The metal seat
should be installed with the rounded edge down against
the TFE seat or the 316 SS back-up ring.
Follow steps 9 thru 12 of Soft Seat Replacement instruc-
tions.
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Smooth tape as much as possible by hand. Slight
roughness is acceptable and will be pressed flat
during final assembly. Avoid tearing tape. If a tear
occurs, tape should be overlapped a minimum of
1
/8 inch. Trim excess tape from outside diameter of
the seat.
Fire-Flow and Metal Seat Replacement
MAINTENANCE INSTRUCTIONS
Disc, Shaft and Bearing Replacement
12
Flowseal uses a wedge pin method of disc/shaft pinning. This
method permits the replacement of either a disc or a shaft
since they are not required to be matched sets.
Using a punch approximately the same size as
the wedge pins, drive each pin out of the disc hub from
the non-peened side of the disc to the peened side of
the disc.
Pull the wedge pins out of the disc hub using
thethreaded holes on top of each pin and a jack screw.
With the valve body on edge on the bench, shaft
horizontal, and the body overtravel stop nearest to the
bench, position the disc in the open position with the flat
face upward. Present the disc to the valve body from
the side opposite the seat retainer cavity.
Support the disc on a bench, flat side down and
elevated above the bench top to a height of approxi-
mately 4 inches. Lower the valve body over the disc,
seatretainer side facing upward, until the bearing bore
and disc hole are aligned. Install the shaft into the body
and disc.
