Series NK/F, NKP/F, NKS/F, NKSP/F, NKL/F, NKLP/F
Page 15
9520-070-en
Revision 10
TM 8361
Edition 10/2010
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
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
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:
Valve closed
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:
Valve open
Marks at right angles to the axis of the pipeline:
Valve closed
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.
9.2.2 Actuated by means of worm gear
In the standard version, the manufacturer normally
provides worm gears with a special pick-up for the
stem pivot.
The bracket and the coupling are thereby not
required.
Commercially available worm gears equipped with a
connection as per ISO 5211 can also be connected.
These require a bracket and a coupling however.
This version is also necessary for butterfly valves
with a safety stuffing box.
Couplings and brackets are available as accessories
in the Richter range of products.
9.2.3 Remotely actuated
Richter butterfly valves can be remotely actuated by
means of pneumatic, hydraulic or electric quarter-turn
actuators equipped with a connection as per ISO
5211.
Couplings and brackets are available as accessories
in the Richter range of products.
9.2.4 Required breakaway torque
The breakaway torque of the actuator must
be at least as high as the breakaway torque
of the butterfly valve, about 20% higher being
better however.
Media of higher viscosity and/or those with solids may
require an increased factor of safety when calculating
the size of the actuator. This is particularly true for
non-Newtonian fluids such as high polymer sub-
stances, suspensions, pastes, lubricants, resins,
lacquers etc.
Admissible factors of safety lie in the range of 20 -
50% of the breakaway torque.
To prevent damage to the valve, particular attention
must be paid to the torque Mdmax in
Section 1.8
.
9.3 Options
9.3.1 Safety stauffing box
The safety stuffing box acts independently from the
standard shaft gasket and can be re-adjusted by
hand.
Only with the option safety stuffing box: A sealing foil
413
is inserted between the upper section and the
lower section of shell.
If the shaft gasket is damaged, the valve can thus
continue to be operated for a short time.
See drawing
Section 10.10
.
In order to ensure leak monitoring, Richter recom-
mends the combination of the safety stuffing box with
a warning connection.
If only the safety stuffing box is present, do not
tighten it so that any leak becomes visible.
Otherwise the valve may be destroyed by an
unnoticed internal leak.
9.3.2 Monitoring connection
The monitoring connection, between the standard
shaft gasket and the safety stuffing box, can be fitted
with attachments for monitoring pressure.
It can indicate leaks or build up a protective nitrogen
layer. See drawing
Section 10.10
.
Summary of Contents for NK/F series
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