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Series 45/55 OS&Y Maintenance

AVK Series 45/55 OS&Y Gate Valves
Operation and Maintenance

OS&Y Gate Valve Repairs:
Handwheel Replacement

 (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.

OS&Y Gate Valve Repairs:
Stem Seal O-Ring Replacement

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.

OS&Y Gate Valve Repairs:
Stem/Wedge Assembly Replacement

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.

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Series 764 Maintenance

AVK Series 764 Plug Valves
Operation and Maintenance

OPERATION AND MAINTENANCE
OPERATION
WARNING: Flush the system prior to operating valves to prevent damage to seats and plugs.
1. Do not operate the valves in a system that exceed the valves rated working pressure of 250 PSI.
2. AVK Eccentric Plug Valves are “Open Left” or counter-clockwise to open, quarter turn or 90 degrees to open or close.
3. Manually actuated valves have mechanical stops for the open and closed positions that are clearly marked on the Stop
Plate (F718). There are also detents in the Stop Plate (F718), if valve throttling is desired. ( See Fig. 5 )
4. For valves with gearboxes, the number of turns to open and close are as follows:
2½”, 3″, and 4″ – 8.5 turns
6″ – 9.5 turns
8″ – 12 turns
10″ and 12″ – 24 turns
5. Valve operation and cycling should be scheduled more frequently for systems that have higher solid contents in the water.
6. Never force the valve to seat. Re-open the valve and flush the system again to verify that debris has been dislodged from
the seating area.

MAINTENANCE
WARNING: Flush the system prior to operating valves to prevent damage to seats and plugs. When performing
maintenance that requires disassembly on valves, ensure that the system pressure is at 0 PSI.
1. AVK Eccentric Plug Valves are designed to be relatively maintenance free. Do not disassemble valves unless an
interruption to normal service has occurred in the system.
2. Periodic lubrication is not required. Lubrication is only required if disassembly/reassembly of the valve is performed.
3. Regular functional inspections should be performed at a minimum of twice a year. When performing a functional
inspection, operate the valves under normal working pressure, making sure they operate normally without any vibrations.
4. For valves with gearboxes, refer to the gearbox manufacturer’s maintenance procedures.
5. Proper records should be maintained for all maintenance procedures and schedules.

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Series 41/53 Maintenance

AVK Series 41 Swing Check Valve Lever and Weight and Spring and Weight Installation

LEVER AND WEIGHT
Once the valve is properly installed, the lever and weight assembly needs to be attached to the Shaft (408) passing
through the Open Bushing (417) in the Bonnet (407). Slide the Lever (416) onto the Shaft (408) and position as shown in
figure 4. Secure the Lever with the Shaft Washer (415) and Shaft Nut (414) and tighten to 30 ft-lbs. Attach the Weight (419)
and tighten the Set Screw (420) to hold the weight in place. A medium strength thread locking compound such as Locktite 242
should be used to attach the Lever and Weight.
WARNING: The weight can be moved on the lever to adjust closing speeds for optimum performance. DO not adjust
the weight while the system is operation. Serious injury can occur. 

LEVER AND SPRING 3″- 8″ 
For sizes 3-inch through 8-inch, the Spring Bracket (428) must be installed using the flange mounting hardware
(figure 6). Install the Spring Eyebolt (425) on the Spring Bracket, securing it with the Spring Eyebolt Nuts (426), and Spring
Eyebolt Washers (427), one washer and nut on each side of the Spring Bracket (428). Slide the Lever (416) onto the Shaft
(408) and position as shown in figure 4. Secure the Lever with the Shaft Washer (415) and Shaft Nut (414) and tighten to 30
ft-lbs. Attach Spring (424) in it’s relaxed position as shown in figure (6).A medium strength thread locking compound such as
Locktite 242 should be used to attach the Lever.

LEVER AND SPRING 10″-12″ 
For Lever and Spring equipped 10-inch and 12-inch swing check valves, the Lever and Spring Assembly is installed
at the factory.

LEVER AND SPRING 10″-12″ (OPTIONAL)
For Lever and Spring equipped 10-inch and 12-inch swing check valves, the Lever and Spring Assembly is installed at the factory.

AVK Series 53 Ball Check Valve Disassembly for Inspection and Reassembly after Inspection

DISASSEMBLY FOR INSPECTION
For convenience, the valve can be disassembled for inspection without removing it from the pipeline. All work on the
valve should be performed by a skilled mechanic with proper tools and a power hoist for larger valves. Disassembly may be
required to inspect the ball for wear or the valve for deposits.
WARNING: The line must be isolated, depressurized, and drained before removing the valve bonnet or removing the
valve from line. Failure to do so may cause pressure to be released resulting in severe injury or death.
1. Isolate the valve, relieve pressure and drain the pipeline. Remove the bonnet bolts (601) and bonnet
nuts (605) from the bonnet (602).
2. Pry the valve bonnet (602) loose if required and lift off.
3. Inspect the ball (604) to see if it is worn or damaged. For larger valves, the valve may need to be removed
from the line to remove the ball.
4. Replace worn parts as necessary or replace head assembly with a new head assembly.

REASSEMBLY AFTER INSPECTION
All parts and sealing surfaces must be cleaned before reassembly. Worn parts and seals should be replaced during
reassembly.
1. Insert the ball (604) into the valve body (600).
2. Place the bonnet o-ring (603) onto the bonnet (602).
3. Place the bonnet/o-ring assembly onto the valve body (be careful not to displace the bonnet o-ring) and
fasten with the appropriate bonnet bolts (601) and bonnet nuts (605). Ensure that the bonnet
o-ring (603) is not being pinched between the bonnet (602) and valve body (600).
4. Tighten the bonnet bolts (601) to 45 ft-lbs incrementally in a crossover pattern to ensure that the bonnet
(602) does not bend or crack and the bonnet o-ring (603) is evenly compressed.