The DeZURIK Level Sensor Knife Gate Valve is a resilient seated valve de-
signed specifically for mounting a level sensor to a stock chest. The valve, when
closed, allows the level sensor to be removed without draining the stock chest.
A ratcheting lever actuator requires minimum clearance to operate the valve.
Two purge connections for flushing the inside of the valve are included.
Install the valve with the seat end away from the stock chest, and toward the
level sensor. Refer to Installation Drawing A-42347 for dimensional information.
Flange gaskets are required. Before installation, remove foreign material such
as weld spatter, oil, grease, and dirt from the valve and pipeline. Tighten the
flange bolts evenly, in a crisscross pattern, to prevent distortion of the body and
gate.
Approximately monthly, lubricate the fitting on the valve actuator with a lithium-
based grease.
The gate packing is contained and compressed by the packing gland. If packing
leakage occurs, tighten the adjustment nuts on top of the packing gland. Tighten
the nuts evenly and gently — just enough to stop the leakage. Over tightening
will cause excessive operating forces, and will decrease the life of the packing.
1. Relieve the pressure in the pipeline and close the valve.
2. Remove the two screws and nuts near the top of the gate and disengage
the actuator stem from the gate by stroking the actuator (not the valve) to
the open position.
3. Remove the gland nuts, washers, and packing gland.
4. Remove the used packing from the packing chamber.
5.
With the gate closed, center the gate in the body opening below the packing
chamber.
6.
Cut 3 new packing rings in 8-3/4" lengths. Assemble and pack the rings one
at a time with the ends together, but not overlapped, first ring type CD, sec-
ond ring type ZJ, last ring type CD. Stagger the joints, on the long sides of
the packing chamber. A square-end wood or plastic tool, driven by a ham-
mer or mallet, is recommended for packing the rings. The inside and outside
edges of each ring are to be packed against the gate and packing chamber,
so that each ring is compressed flat and evenly.
7. Replace the packing gland, washers, and nuts. Tighten the nuts evenly and
finger tight, plus 1/2 turn.
8. Reconnect the actuator stem to the gate with the two screws and nuts.
9. The valve may now be pressurized. 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.
Description
Installation
Lubrication
Packing
Adjustment
D10107
Page
2
August
2009
Packing
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.
