M&H 4500, Руководство пользователя

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b. Approximately 45 minutes for 14” – 24” valves.
Alternating Star Pattern for Vane Ring Bolt Tightening
Section 5.3.2.1 – 30” thru 72” REMOVAL OF EXISTING SEAT
1.
With vane in the closed position, remove seat ring retention screws.
2. Remove the stainless-steel clamp ring segments from the valve. For 30” and larger valves, these are
not bonded to the rubber Vane Seat Ring.
3. Open valve approximately 20 degrees to remove the rubber Vane Seat Ring.
4. Lift the near side seat edge up from the vane 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.
5. 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.)
6. Clean any debris, grease, or coating material from seat recess on vane and from stainless steel seating
surface in the valve body.
Section 5.3.2.2 – 30” thru 72” INSTALLATION OF NEW SEAT
1.
With the existing Vane Seat Ring removed and the seating area cleaned of any debris and any raised
(or rough) surfaces smoothed, move the vane to the close position. Make sure the vane is level in the
valve body. (If the vane is not level, refer to Section 5.5 – VANE LEVEL ADJUSTMENT)
2. Fully lubricate the stainless-steel body ring and the new rubber seat ring with an NSF61 approved
lubricant. Use extra lubricant at contact area near the shaft locations. Lay the new rubber Vane Seat