M&H 4500, Руководство пользователя

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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 located 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 as shown in the picture below.
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 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.
6. Retest the valve as necessary in accordance with AWWA C504 sec. 5.2.2.2.
Section 5.3.1.3 – 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,
2. TOOLS REQUIRED
a. 7/16” socket for valve sizes 3” thru 12”,
9/16” socket for valve sizes 14” thru 24”
b. An adjustable torque wrench with in-lb settings up to 250in-lbs
NOTE: It is not recommended to use a torque wrench with ft-lbs increments.
c. Screwdriver
d. Rubber mallet or hammer with wood block.
3. ESTIMATED SERVICE TIME
a. Approximately 30 minutes for 4” – 12” valves