AVK SUPPORTExpect... AVK
AVK SUPPORT (Figs.6A,6B)
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! Also provide sufficient clearing around the valve
so that no soil or debris may fall into it.
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. Remove the two upper Gland Follower / Yoke Nuts (F206),
using a 15/16″ or 24mm wrench for valve sizes 2.5″-4″, or a
1 1/4″ or 30mm wrench for valve sizes 6″-12″, and
associated Washers (F207). Lift the Gland Follower (F208)
up off of the Stud Bolts (F210).
2. Remove the two lower Gland Follower / Yoke Nuts (F206)
and associated Washers (F207) from the Stud Bolts (F210).
3. Turn the remaining part of the Handwheel (F202) in the
closing direction. This will lift the Yoke (F205) up the Stud
Bolts until the upper half of the Stem Nut (F201) comes off of
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!
CAUTION: Do not over tighten the upper pair of Gland Follower
/ Yoke Nuts (F206). Over tightening can cause the Gland (F209)
to fracture. Tighten the nuts evenly so the Gland Follower applies
even and level pressure on the Gland. If the Gland Follower is
assembled at an angle, leaks may occur.
5. Perform steps 1 through 4 in reverse order to re-assemble.
Turn the Handwheel a few additional turns after the Yoke
has seated on the Bonnet (F217). This will help prevent
undue strain placed on the Gland (F209) when replacing the
upper nuts and washers.
6. Repressurize the system. At this time, if there is a leak
around the Gland (F209) be sure that the upper Gland
Follower / Yoke Nuts (F206) are screwed down evenly on the
Stud Bolts (F210). Tighten the nuts 1/4 turn each until the
leak stops.
NOTE: Since UL , ULC and FM Approvals are for the
Manufacturer, this procedure will have no effect on
listings or approvals.
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! Also provide sufficient clearing around the
valve so that no soil or debris may fall into it.
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. Remove the two upper Gland Follower / Yoke Nuts (F206)
and associated Washers (F207). Lift the Gland Follower
(F208) up off of the Stud Bolts (F210). (See Fig. 7A)
2. Lift the Gland (F209) 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.
3. Reverse steps 2 and 3 for re-assembly.
CAUTION: Do not over tighten the upper pair of Gland Follower
/ Yoke Nuts (F206). Over tightening can cause the Gland (F209)
to fracture. Tighten the nuts evenly so the Gland Follower applies
even and level pressure on the Gland. 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 (F209) be sure that the upper Gland
Follower / Yoke Nuts (F206) are screwed down evenly on the
Stud Bolts (F210). 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! Also provide sufficient clearing around the valve
so that no soil or debris may fall into it.
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. Remove the two upper Gland Follower / Yoke Nuts (F206),
using a 15/16″ or 24mm wrench for valve sizes 2.5″-4″,
or a 1 1/4″ or 30mm wrench for valve sizes 6″-12″, and
associated Washers (F207). Lift the Gland Follower (F208)
up off of the Stud Bolts (F210).
2. Remove the two lower Gland Follower / Yoke Nuts (F206)
and associated Washers (F207) from the Stud Bolts (F210).
3. Turn the remaining part of the Handwheel (F202) in the
closing direction. This will lift the Yoke (F205) up the Stud
Bolts until the upper half of the Stem Nut (F201) comes off of
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!
5. Line up the new Handwheel and upper half of the Stem Nut
(F201), with the correct slots on the lower half of the Stem
Nut (F205). Carefully turn the Handwheel and Stem Nut to
begin threading them onto the Stem (F215).
6. Turn the Handwheel a few additional turns after the Yoke
has seated on the Bonnet (F217). This will help prevent
undue strain placed on the Gland (F209) when replacing the
upper nuts and washers.
CAUTION: Do not over tighten the upper pair of Gland Follower
/ Yoke Nuts (F206). Over tightening can cause the Gland (F209)
to fracture. Tighten the nuts evenly so the Gland Follower applies
even and level pressure on the Gland. If the Gland Follower is
assembled at an angle, leaks may occur.
6. Replace the two lower Gland Follower / Yoke Nuts (F206)
and associated Washers (F207), Gland Follower (F208), and
upper washers and nuts.
7. Repressurize the system. At this time, if there is a leak
around the Gland (F209) be sure that the upper Gland
Follower / Yoke Nuts (F206) are screwed down evenly on the
Stud Bolts (F210). Tighten the nuts 1/4 turn each until the
leak stops.
NOTE: Since UL , ULC and FM Approvals are for the
Manufacturer, this procedure will have no effect on
listings or approvals.