AVK SUPPORTExpect... AVK
AVK SUPPORTWARNING: To perform the following steps, be sure the Water
Main Supply Line has been shut off, and that the pressure has
been bled off!
NOTE: As most OS&Y valves are used in fire protection
applications, verify that any alarm systems have been
disabled prior to performing any maintenance or repairs.
1. Using a small, flat bladed screwdriver, remove the hot melt
glue that covers the Bonnet Bolts (F216).
( See Fig. 6A )
2. Once the hot melt glue has been removed, use 5/16″, or 8mm
Allen wrench to remove the 2½” valve Bonnet Bolts (F216),
and a 3/8”, or 10mm Allen wrench for valve sizes 3″- 8″.
3. Turn the remaining part of the Handwheel (F202) in the
closing direction. This will lift the Yoke/Bonnet (F263) head
assembly, allowing removal of the Upper Stem Nut (F201),
from the Stem Assembly (F215).
4. Remove the upper half of the Stem Nut (F201) from the
handwheel and place it in the “new Handwheel” (F202).
NOTE: The Stem Nut pair are keyed with different sized lugs.
Be sure to align the lugs in the correct location!
(See Fig. 6B)
5. Align the Upper Stem Nut (F201), with the Lower Stem Nut
(F205), And insure that there is full engagement of the lugs.
6. Carefully turn the Handwheel (F202) in the opening direction
until the Yoke/Bonnet (F263), is fully down and resting on the
Body (F219).
CAUTION: When lowering the head assembly back on the body,
take care to ensure that the Bonnet Gasket (F218), is not
damaged.
7. Install the Bonnet Bolts (F216), taking care to ensure they are
inserted through the Bonnet Gasket (F218), and tighten in a
diametrically opposed pattern.
8. To replace the protective hot melt glue over the Bonnet Bolts,
use any EPA approved caulk, or hot melt glue.
9. Repressurize the system. At this time, if there is a leak
around the Stem Seal O-ring area, be sure that the upper
Gland Follower Bolts (F261) are screwed down evenly into
the Bonnet/Yoke (F263). Tighten the nuts 1/4 turn each until
the leak stops
WARNING: To perform the following steps, be sure the Water
Main Supply Line has been shut off, and that the pressure
has been bled off!
NOTE: Verify that any alarm systems have been disabled prior
to performing any maintenance or repairs.
1. Remove the two upper Gland Follower Bolts (F261)
and associated Washers (F262). Lift the Gland Follower
(F208) up expose the Stem Seal O-rings (F211). (See Fig. 7A)
2. Use a small screwdriver or probe to access the three Stem
Seal O-rings (F211).
NOTE: These O-rings are split-type o-rings. When replacing
them, insure that the splits DO NOT align. Rotate the
splits at approximately 30 degree intervals. Use a light
coat of FDA approved, food grade grease for lubrication.
(See Fig. 7B)
3. Reverse steps 2 and 3 for re-assembly.
CAUTION: Do not over tighten the upper pair of Gland Follower
Bolts (F261). Tighten the bolts evenly so the Gland Follower
applies even and level pressure on the O-rings. If the Gland
Follower is assembled at an angle, leaks may occur.
4. Repressurize the system. At this time, if there is a leak
around the Gland Follower (F208) be sure that Gland Follower
Bolts (F261) are screwed down evenly on the Gland Follower
(F208). Tighten the bolts 1/4 turn each until the
leak stops.
1. AVK Series 145 OS&Y valves have a pre-tapped, 1/2″ NPT
threaded hole in the Yoke/Bonnet (F263), for mounting a
Supervisory Switch. (See Fig. 8A)
2. With the valve in the fully open position, there is a stem groove
that allows the switch to indicate the open position.
3. Refer to the switch manufacturer’s instructions for correct
switch installation.
