1. Relieve the pressure in the pipeline and close the valve.
2. Remove the valve from the system.
3. Remove the two screws and nuts near the top of the gate and disengage
the stem from the gate.
4. Remove the actuator yoke and actuator from the valve.
5. Remove the gland nuts, washers, and packing gland.
6. Remove the gate from the body.
7. Remove the packing from the packing chamber.
8. Push the top of the resilient seat toward the center of the valve, and remove
the seat through the packing chamber.
9. Reversing step 8, insert the new seat through the packing chamber and be-
hind the lug at the 6 o‘clock position in the body. Then push the top of the
seat into position.
10. Replace the gate in the body, with the beveled edge facing away from the
resilient seat. Place the gate in the fully closed position.
11. Replace the packing, as described in step 6 in the PACKING REPLACE-
MENT section.
12. Replace the packing gland, washers, and nuts. Tighten the nuts evenly and
finger tight, plus 1/2 turn.
13. Replace the yoke and actuator on the valve.
14. Reconnect the stem to the gate with the two screws and locknuts.
15. Replace the valve in the system. Refer to the requirements in the INSTAL-
LATION section. If packing leakage occurs, tighten the adjustment nuts on
top of the packing gland. Tighten the nuts evenly and slowly, just enough to
stop the leakage. Over tightening will cause excessive operating forces, and
will decrease the life of the packing.
D10107
Page
3
August
2009
Seat
Replacement
DeZURIK
3” Level Sensor Knife Gate Valve
WARNING!
Pipeline pressure can propel the loose flange bolts and
flanges, and can cause personal injury or equipment dam-
age. Relieve pipeline pressure before removing flange bolts
and flanges.