Removal of Existing Seat Ring - Sizes 3”-24”:
1. With vane in the closed position, remove seat
retention screws.
2. Open valve approximately 20 degrees to remove
the seat. NOTE:
For 3” thru 24” valves, the Vane Ring
Rubber is molded to the stainless-steel insert. They
are one unit and can only be removed from the valve
as one piece.
3. Lift the near side seat edge up from the seat recess
area and, using a rubber mallet or hammer & block of
wood, tap lightly on the seat edge to bump the Vane
Seat Ring away from the recess area of the vane.
4. Gently work the Vane Seat Ring free, keeping in mind
that resistance may be encountered at areas of
contact near the shaft locations. (Forcible removal
may damage the seat and prohibit reuse, if desired.)
5. Clean any debris, grease, or coating material from
seat recess on vane and from stainless steel
seating surface in the valve body.
Installation of New Seat - Sizes 3”-24”:
1. With the existing vane seat ring removed and the
seating area cleaned of any debris and raised
(or rough) surfaces smoothed, move the vane to
the close position. Make sure the vane is level in the
valve body. (If vane is not level, refer to–
VANE LEVEL ADJUSTMENT)
2. Fully lubricate the stainless-steel body seat with an
NSF61 approved grease or pipe lubricant. Use extra
lubricant at contact area near the shaft locations.
Fully lubricate the rubber portion of the new Vane
Seat Ring. Lay the Vane Seat Ring on vane, aligning
the vane ring bolt holes in the vane and seat ring as
best as possible. Gently tap the seat ring with a
rubber mallet or with a block of wood to push the
ring into place.
3. Once the Vane Seat Ring is in the seat recess, the
bolts holes can be further aligned. Using self-locking
seat adjusting screws, place screws in all the seat
vane ring bolt holes. By hand, make sure that the
screws are threaded into the holes to secure the seat
to the vane. Do not begin compression of the rubber
seat at this point.
4. For 3” thru 12” BFVs:
A. Set the torque wrench to 90in-lbs, torque all of
the bolts down to 90in-lbs in an alternating star
pattern as shown in the picture below.
B. Increase the setting on the torque wrench to
110in-lbs and repeat the process.
C. Pressure test the valve. If the valve holds the
rated pressure, then the process is done.
D. If the valve does not hold the rated pressure,
then increase the setting on the torque
wrench to 130in-lbs and repeat the pressure
test. Again, if the valve holds the rated
pressure, then the process is done.
E. If the valve does not hold, increase the setting
on the torque wrench to 150in-lbs, and a repeat
the process.
F. If the valve holds the rated pressure, then the
process is done. If the valve still does not hold
pressure, then consult the factory.
5. For 14” thru 24” BFVs:
A. Set the torque wrench to 160in-lbs, torque all of
the bolts down to 160in-lbs in an alternating
star pattern.
B. Increase the setting on the torque wrench to
180in-lbs and repeat the process.
C. Pressure test the valve. If the valve holds the
rated pressure, then the process is done.
D. If the valve does not hold the rated pressure,
then increase the setting on the torque wrench
to 200in-lbs and repeat the pressure test. Again,
if the valve holds the rated pressure, then the
process is done.
E. If the valve does not hold, increase the setting
on the torque wrench to 220in-lbs, and repeat
the process.
F. If the valve holds the rated pressure, then the
process is done. If the valve still does not hold
pressure, then consult the factory.
6. Retest the valve as necessary in accordance with
AWWA C504 sec. 5.2.2.2.
3” thru 24” Service Details
1. Parts Required:
A. Vane Seat Ring
B. Seat Ring retention screws- with
pre-applied ‘nylock’
C. NSF61 approved Lubricant
PAGE 5
