Table of Contents
Advertisement
Series NKS/F, NKSP/F, NKL/F, NKLP/F
9
Maintenance
♦ All repair work is to be performed by qualified
personnel using the appropriate tools.
♦ For the arrangement, designation and item
numbers of all parts of the valve, see Section 10.
♦ Spare parts are to be ordered with all the details
in acc. with the valve identification.
♦ Only original spare parts may be installed.
♦ To prevent leaks, a regular check of the connec-
tion screws should be made in line with the oper-
ating requirements.
For tightening torques, see Section 1.3.
♦ When disassembling and assembling the valve,
attention is to be paid to the tables and drawings
in Section 1 and 10.
♦ As the body lining 409 is drawn over the
disc/stem unit 221 while warm, this work should
only be carried out by the manufacturer.
♦ Has the valve been shut down, drained and
flushed in accordance with the regulations?
See also Section 7.3.
If
assembled
components
damaged and this can result in malfunc-
tions during operation.
9.1
Notes on assembly
♦ The flexible inlay 521 expands during assembly.
Do not cut off the overhang, but push back into
the lower and upper part of the shell 120.
♦ Before tightening the body screws 914/1 (on
NKL/NKLP threaded rod 918/1 and hex. nut
920/2), align the disc/stem unit 221 centrally in
the closed position.
♦ Mark the position of the disc/stem unit 221
against body lining 409 at the hub, so permitting
switching only to this point during later test switch-
ing.
♦ With disc/stem unit in closed position, tighten the
body screws (914/1, as well 918/1 and 929/2)
until the gap between the upper and lower part of
the shell 120 is ca. 5 mm.
♦ Open the valve several times counterclockwise
(when viewing the stem unit) and close again in
the opposite direction. A sealing edge can form in
this way.
Never switch in the other direction of
rotation over the sealing edge!
9520-020-en
Revision 16
TM 10207
Edition 05/2020
incorrectly,
individual
of
the valve
may
be
♦ Tighten the body bolts 1-2 mm when disc in closed
position.
♦ Repeat the previously described process once or
twice.
♦ When finally tightening the body bolts, pay
attention to the torques provided in Section 1.3.
9.1.1 Safety stuffing box
♦ Insert sealing foil 413 between the upper and
lower halve of the shell 120.
♦ Displace packing rings 402/1 by 90° against each
other
♦ Screw in stuffing box screws 901/3. Only tighten
further in the event of a leak.
♦ Safety stuffing box with monitor using warning
connection
Tighten stuffing box bolts 901/3 with torque in
accordance with Section 1.3.
See also Section 10.10.
For detailed installation and inspection regulations for
shut-off and control butterfly valves, see QM No.
0910-08-1005, available from Richter on request.
9.2
Valve actuation
The valve stem has a pivot to attach a hand lever
respectively a coupling.
Hand lever respectively pivot parallel to the axis of
the pipeline: →
Valve open
Hand lever respectively pivot at right angles to the
axis of the pipeline:
→
In the case of a coupling, 2 red marks indicate the
position of the disc on them.
Marks parallel to the axis of the pipeline:
→
Marks at right angles to the axis of the pipeline:
→
9.2.1 Actuated with lever
The throttling plate 519 permits a fixing of the lever at
15° intervals. It is lockable with a commercially
available padlock.
Page 15
Valve closed
Valve open
Valve closed
Advertisement
Table of Contents
