SERIES 762 BIDIRECTIONAL SLURRY KNIFE GATE VALVES
Installation, Operation, and Maintenance Manual
25 of 30
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contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
Figure 7:
Gate Disassembly
Figure 8:
Gate Removal
14.3
GATE REPLACEMENT
14.3.1 1. Relieve the line pressure and open the valve. Flush the line if
necessary.
2. Remove the cylinder port tubing and vent the air inside the
cylinder if the valve with Pneumatic operated.
3. Remove the seat as per seat replacement procedure.
4. Lock the gate in opened position using a suitable locking pin
in the holes provided.
5. If the valves are supplied with bellows, ensure stem is not
rotated, as rotation will damage the bellows.
6. Disassemble the super structure by removing the fasteners
with body.
7. Lift the damaged/old gate & superstructure from the body
assembly using suitable sling strapped below the base plate
of superstructure. An overhead hoist may be required for
larger size valves.
8. Lay the superstructure & old gate assembly in horizontal
position & disconnect the stem/Piston rod from the gate by
removing the clevis bolts & nuts.
9. Remove the secondary seal, wiper and retainer and inspect
the seal for suitability to reuse.
10. Lubricate the new gate and install it in body carefully.
11. Insert the secondary seal back into the packing chamber.
12. Re-attach the wiper and secondary seal retainer onto the
valve body.
13. Tighten the secondary seal retainer bolts.
14. Inject the recommended lubricant at the grease nipple.
15. Mount the actuator and super structure on the valve.
16. Hand tighten the body bolting to the superstructure.
17. Tighten the actuator bolting.
18. Connect the gate and stem by clevis bolts and nuts.
19. Lower the stem by rotating the hand wheel clockwise (or
by applying air gradually for cylinder operated valves) while
holding the stem and fasten the stem to the gate with bolts
and nuts.
20.Operate the valve for a few cycles and then tighten the body
to superstructure bolting as per the recommended torque as
per Table Install the seat as per above procedure.
21. Adjust and ensure the gate positions from top of the body
according to
Table 2
on page 15.
14.3.2 Changing or repair of other valve parts by users is not
recommended; please contact Bray for any further advice and
assistance.
(continued)
