Richter NKS/F series User manual

INSTALLATION AND OPERATING MANUAL
Keep for future use!
This operating manual must be strictly observed before
transport, installation, operation and maintenance
Subject to change without notice.
Reproduction is generally permitted with indication of the source.
© Richter Chemie-Technik GmbH.
9520-020-en Revision 16 Edition 05/2020
Series NKS/F, NKSP/F,
NKL/F, NKLP/F
Shut-off and Control Butterfly Valve
Sandwich-type body: Series NKS/F
Lug-style body: Series NKL/F

Series NKS/F, NKSP/F, NKL/F, NKLP/F Page 2
9520-020-en Revision 16
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List of Contents
List of Contents ................................................ 2
Relevant documents ........................................ 3
1Technical data............................................. 3
1.1 Overview of sizes ...........................................4
1.2 Type plate, CE and body markings ..............4
1.3 Tightening torques..........................................5
1.4 Dimensions .....................................................6
1.5 Flow rate value kv100 [m³/h] .........................6
1.6 Weights (ca. kg)..............................................7
1.7 Pressure-temperature diagram .....................7
1.8 Actuating torques ...........................................8
1.9 Cavitation coefficient z for 75% duty ............8
2Notes on safety ........................................... 8
2.1 Intended use ...................................................8
2.2 For the customer / operator...........................9
2.3 Improper operation.........................................9
3Safety notes for applications in potentially
explosive areas based on the Directive
2014/34/ EC (ATEX)..................................... 9
3.1 Intended use ...................................................9
4Safety note for valves, certified to Clean
Air Act (TA Luft) ........................................ 10
5Transport, storage and disposal............. 11
5.1 Storage..........................................................11
5.2 Transport preparations ................................11
5.3 Return consignments ...................................11
5.4 Transport securing .......................................11
5.5 Disposal.........................................................12
6Installation ................................................. 13
6.1 Installation possibilities ................................13
6.2 Flange caps and gaskets.............................13
6.3 Direction of flow and installation position..13
6.4 Installation .....................................................13
6.4.1 Additional advice for shut-off and control
butterfly valve with actuator............................... 13
6.5 Grounding .....................................................13
7Operation ................................................... 14
7.1 Initial commissioning ................................... 14
7.2 Improper operation and their consequences
................................................................... 14
7.3 Shutdown...................................................... 14
7.3.1 Additional advice for shut-off and control
butterfly valve with actuator ............................... 14
8Malfunctions .............................................. 14
9Maintenance .............................................. 15
9.1 Notes on assembly ...................................... 15
9.1.1 Safety stuffing box...............................................15
9.2 Valve actuation............................................. 15
9.2.1 Actuated with lever ..............................................15
9.2.2 Actuated by means of worm gear .....................16
9.2.3 Remotely actuated .............................................. 16
9.2.4 Required breakaway torque...............................16
9.3 Options.......................................................... 16
9.3.1 Safety stuffing box...............................................16
9.3.2 Monitoring connection.........................................16
9.3.3 Proximity switch ...................................................16
9.4 Tests ............................................................. 16
10 Drawings .................................................... 17
10.1 Legend.......................................................... 17
10.2 Sectional drawing NKS/F, DN 50 –150, 2"–
6" ................................................................... 18
10.3 Sectional drawing NKS/F, DN 200-400, 8"-
14" ................................................................. 19
10.4 Sectional drawing NKL/F, DN 50 –150, 2"–
6" ................................................................... 20
10.5 Sectional drawing NKL/F, DN 200-400, 8"-
14" ................................................................. 21
10.6 Worm gear.................................................... 22
10.7 Actuator......................................................... 22
10.8 Option safety stuffing box ........................... 23
10.9 Dimensional drawing NKS/F with lever
assembly....................................................... 24
10.10 Dimensional drawing NKS/F with worm
gear ............................................................... 25
10.11 Dimensional drawing NKSP/F ............... 26
10.12 Dimensional drawing NKL/F with lever
assembly....................................................... 28
10.13 Dimensional drawing NKL/F with worm
gear ............................................................... 29
10.14 Dimensional drawing NKLP/F................ 30

Series NKS/F, NKSP/F, NKL/F, NKLP/F Page 3
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Relevant documents
♦EG-Declaration of conformity
♦Declaration of conformity FDA & 97/48/EG
♦Manufacturer Declaration ATEX Directive
2014/34/EU
♦Manufacturer Declaration TA-Luft
♦Form for Safety Information Concerning the
Contamination QM 0912-16-2001_en
♦For NKSP/F or NKLP/F:
operating manual for actuator
On request :
♦Installation and inspection regulations for centric
shut-off valves of the series NKL/NKLP,
NKS/NKSP, QM No. 0910-08-1005
♦Connection dimension for actuator Dimen.
9520-00-4212
1 Technical data
Manufacturer :
Richter Chemie-Technik GmbH
Otto-Schott-Str. 2
D-47906 Kempen
Telephone: [phone]
Fax: [phone]
E-Mail : [email protected]
Internet: http://www.richter-ct.com
Designation :
Shut-off and control butterfly valve
2 body designs: lug-style and wafer-style.
Disc/stem unit plastic-lined
Certified to Clean Air Act (TA Luft)
Strength and tightness (P10, P11) of the pressure-
bearing body tested to DIN EN 12266-1.
Gas-tight (P12) in the seat to DIN EN 12266-1,
leak rate A
Flange connecting dimensions:
DIN EN 1092-2, type B (ISO 7005-2, type B) PN 10
or ASME B16.5 class 150
Face to face:DIN EN 558-1, basic series 20
(ISO 5752 series 20)
or API 609 table 2 API 609 Tabelle 2
(Exception: DN 350 (14“) L = 92 mm und
DN 750 (30“) L = 154 mm)
MSS SP-67 table 3
Weights: See table in Section 1.6
Dimensions and individual parts:
See dimensional and sectional drawing in Section 10
Materials :
Body material: Ductile cast iron EN-JS 1049 /
ASTM A395
Lining material: PTFE .../F
On request: antistatic …/F–L
modified TFM-PTFE
Disc/stem unit: PFA-lined ...–F
Temperature range: -60 °C to +200 °C
(-80°F bis +400°F)
accord. to operating pressure
See pressure-temperature diagram in Section 1.7.
Operating pressure:
from vacuum to 10 bar (145 psig)
accord. to operating pressure
Actuation :
♦Hand lever, lockable
♦Worm gear with handwheel
♦Pneumatic or electric
♦(connection to ISO 5211)
Options :
♦Safety stuffing box
♦Monitoring connection
♦Proximity initiator
♦Manually operated with limit switch

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1.1 Overview of sizes
Series
actuation
/F
/F-L
Body design
NKS/F
lever
DN 50, 80, 100, 150, 200
2", 3", 4" 6, 8"
DN 50, 80, 100, 150, 200
2", 3", 4" 6, 8"
Gear
DN 50, 80, 100, 150-400
2", 3", 4" 6-16"
DN 50, 80, 100, 150-300,
2", 3", 4" 6-10"
NKSP/F
Actuator
connection to
ISO 5211
NKL/F
lever
DN 50, 80, 100, 150, 200
2", 3", 4" 6, 8"
DN 50, 80, 100, 150, 200
2", 3", 4" 6, 8"
Gear
DN 50, 80, 100, 150-400
2", 3", 4" 6-16"
DN 50, 80, 100, 150-300
2", 3", 4" 6-10"
NKLP/F
Actuator
connection to
ISO 5211
1.2 Type plate, CE and body markings
The stainless steel name plate is undetachably riveted
to the body.
If the operator attaches his identification, it must be
ensured that the valve matches the application in
question.
Example of type plate with CE marking:
Body identification:
The following are visible on the body according to DIN
EN 19 and AD 2000 A4:
♦Nominal size
♦Rated pressure
♦Body material
♦Manufacturer's identification
♦Melt number/Foundry identification
♦Foundry date

Series NKS/F, NKSP/F, NKL/F, NKLP/F Page 5
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Sign for transport securing device for actuator
1.3 Tightening torques
All screws greased, tighten in diametrically
opposite sequence!
After the plant has been started up (especially with the
first temperature load) the tightening torques must be
checked and the correct value set again.
The tightening torques for pipe screws and body
screws mentioned must not be exceeded. For an
exception, see Section 8, Flange connection
valve/pipe is leaking.
The following tightening torques are recommended.
Packing screws 901/3
screws
Tightening torque
[ISO/DIN]
[Nm]
[in-lbs]
2 x M8
3
27
Pipe screws, flanges to ISO/DIN
Flange
Nominal
size
screws
Tightening
torque
[mm]
[ISO/DIN]
[Nm]
50
4 x M16
30
80
8 x M16
25
100
8 x M16
30
150
8 x M20
55
200
8 x M20
75
250
12 x M20
65
300
12 x M20
75
350
16 x M20
75
400
16 x M24
85
Pipe screws, DIN/ISO flanges drilled to ASME Class
150
Flange
Nominal size
screws
Tightening
torque
[mm]
[inch]
[ASME]
[Nm]
[in-lbs]
50
2“
4 x ⅝“
30
266
80
3“
4 x ⅝“
50
442
100
4“
8 x ⅝“
30
266
150
6“
8 x ¾“
55
487
200
8“
8 x ¾“
75
664
250
10“
12 x ⅞“
65
575
300
12“
12 x ⅞
75
664
350
14“
12 x 1“
75
664
400
16“
16 x 1“
85
752
Body screws
Screws 901/3 for lug-style body
Nominal size
Screws
Tightening
torque
[mm]
[inch]
[ISO/DIN]
[Nm]
[in-lbs]
50
2“
2 x M10
40
355
80
3“
2 x M12
70
622
100
4“
2 x M12
70
622
150
6“
2 x M16
150
1330
200
8“
2 x M16
150
1330
250
10“
2 x M20
290
2570
300
12“
2 x M20
290
2570
350
14“
4 x M16
150
1330
400
16“
4 x M20
290
2570

Series NKS/F, NKSP/F, NKL/F, NKLP/F Page 6
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Hex. socket screw 914/1 for sandwich body
Nominal size
Hex. socket
screw
Tightening
torque
[mm]
[inch]
[ISO/DIN]
[Nm]
[in-lbs]
50
2“
2 x M10
30
266
80
3“
2 x M12
50
442
100
4“
2 x M12
50
442
150
6“
2 x M16
100
885
200
8“
2 x M16
100
885
250
10“
2 x M16
100
885
300
12“
2 x M20
200
1770
350
14“
4 x M16
100
885
400
16“
4 x M16
100
885
1.4 Dimensions
Nominal size
E1
T1
L2
Connec-
tion3
[mm]
[inch]
[mm]
[mm]
[mm]
50
2“
28
4
43
F07
80
3“
67
17.5
46
F07
100
4“
87
24.5
52
F07
150
6“
142
48
56
F10
200
8“
193
71
60
F10
250
10“
243
92
68
F12
300
12“
292
112
78
F12
350
14“
343
137
78
F14
400
16“
389
150
102
F14
1 See also Section 6.4, paragraph 1
2 Face to face to DIN EN 558-1, series 20 (ISO 5752, series 20)
3 Connections for worm gears and brackets as per DIN ISO 5211
The inside diameter of the mounted pipe flanges must always be greater than the
dimension E in the table!
For more dimensions, see drawings in Section 10.
1.5 Flow rate value kv100 [m³/h]
Nominal size
[mm] [inch]
Angle of opening
20°
30°
40°
50°
60°
70°
80°
90°
50
2“
1
6
13
24
41
67
104
120
80
3“
5
22
47
82
126
197
264
282
100
4“
11
27
52
93
155
247
412
456
150
6“
37
84
164
276
431
702
1126
1254
200
8“
62
170
354
532
912
1371
2212
2503
250
10“
85
285
512
882
1451
2256
3692
4083
300
12“
159
421
835
1378
2282
3633
5735
6512
350
14“
230
610
1210
2000
3300
5270
8320
9450
400
16“
295
780
1550
2560
4240
6750
10650
12100

Series NKS/F, NKSP/F, NKL/F, NKLP/F Page 7
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1.6 Weights (ca. kg)
Nominal size
Lug style body
Sandwich-
body
[mm]
[inch]
free
shaft end
free
shaft end
Actuated with
lever
Gear
50
2“
4.5
3.5
0.7
4.0
80
3“
7.5
4.5
0.7
4.0
100
4“
9.5
6.0
0.7
4.0
150
6“
16.0
11.0
3.7
4.5
200
8“
23.0
15.0
3.7
4.5
250
10“
35.0
25.0
--
9.5
300
12“
54.0
33.0
--
9.5
350
14“
68.0
47.0
--
15.0
400
16“
97.0
69.0
--
15.0
Actuator see data of the manufacturer
1.7 Pressure-temperature diagram
When used in the area of application of ASME,
the low temperature of ASTM A395 is limited to -20°F
(-29°C).
According to AD 2000
When used in the minus temperature range,
the regulations applicable in the country in
question must be observed.
According to ASME B 16.42

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1.8 Actuating torques
Nominal size
Mderf
Mdmax
[mm]
[inch]
[Nm]
[Nm]
50
2“
20
100
80
3“
46
180
100
4“
63
360
150
6“
128
725
200
8“
185
775
250
10“
287
1435
300
12“
410
1775
350
14“
550
3000
400
16“
650
3500
1.9 Cavitation coefficient z for
75% duty
Nominal size
at kv/kvs = 75 %
[mm]
[inch]
z
50
2“
0.32
80
3“
0.30
100
4“
0.29
150
6“
0.26
200
8“
0.23
250
10“
0.19
300
12“
0.16
350
14“
0.14
400
16“
0.12
2 Notes on safety
This operating manual contains fundamental
information which is to be observed during installation,
operation and maintenance.
It must be read before installation and commissioning!
This operating manual must always be available at the
place of use of the valve.
For valves which are used in potentially explosive
areas, see Section 3.
Installation, operation and maintenance are to be
performed by qualified staff.
The area of responsibility, authority and supervision of
the staff must be regulated by the customer.
General hazard symbol!
People may be put at risk.
Safety symbol! The ball valve and its
function may be put at risk if this safety
symbol is not observed.
It is imperative to observe warnings and signs
attached directly to the valve and they are to be kept
fully legible.
Non-observance of the notes on safety may result
in the loss of any and all claims for damages.
For example, non-observance may involve the
following hazards:
♦Failure of important functions of the valve/plant.
♦Risk to people from electric, mechanical and
chemical effects.
♦Risk to the environment through leaks of hazard-
ous substances.
2.1 Intended use
Richter shut-off and control butterfly valves are
pressure-maintaining components in accordance with
the German Pressure Equipment Directive (DGRL) for
the passage and shut-off of fluids. The valves are
suitable for vapours, gases and liquids of group 1 in
accordance with the PED and have a corrosion-
resistant plastic lining.
The field of application for the shut-off and control
butterfly valves include:
♦Light and medium corrosive, pure and slightly
solids-laden liquids, vaopours and gases
♦Materials in contact with the medium which are
FDA-compliant can be used for food and pharma-
ceutical feedstock as well as in biochemistry.
♦Powdered and granulated non or low abrasive
solids
Shut-off and control butterfly valves with a plastic-
lined disc/stem unit are used for highly aggressive,
corrosive media.
Shut-off and control butterfly valves with a stainless
steel disc/stem unit are suitable for less agressive
media, are cheaper and benficial for thorough valve
cleaning.
For all 3 body versions, the valves can be installed as
a sandwich-type valve (pinch valve, intermediate
flange valve).

Series NKS/F, NKSP/F, NKL/F, NKLP/F Page 9
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Product features:
♦Wide sealing surfaces of the body lining
♦Long valve neck for optimum heat insulation
♦Maintenance-free, self-adjusting stem seal
♦Leak-proof to the atmosphere in accordance with
the German Clean Air Code
Solids can lead to increased wear, damage to sealing
surfaces or to a reduction in the service life of the
valve.
In case of the valve is intended for operating data
other than those intended, the customer must
carefully examine whether the design of the valve,
accessories and materials are suitable for the new
application. (Please consult the manufacturer).
2.2 For the customer / operator
If a valve is used, the operator must ensure that
♦actuators which are retrofitted are adapted to suit
the valve
♦hot or cold valve parts are protected by the
customer against being touched
♦the valve has been properly installed in the pipe
system
♦the usual flow rates are not exceeded in continu-
ous operation.
This is not the manufacturer's responsibility.
Butterfly valves which are used as end
valves must be sealed with a blind flange at
the free connection end and appropriately
secured against unauthorised activation.
Loads caused by earthquakes were not allowed for in
the design.
Fire protection to DIN EN ISO 10497 is not possible
(plastic lining and plastic components).
2.3 Improper operation
The operational safety of the valve supplied is only
guaranteed if it is used properly in accordance with
Section 2.1 of this operating manual.
The operation limits specified on the name
plate and in the pressure-temperature
diagram must under no circumstances be
exceeded.
3 Safety notes for applications in potentially explosive areas
based on the Directive 2014/34/ EC (ATEX)
The valves are intended for use in a potentially
explosive area and are therefore subject to the
conformity assessment procedure of the directive
2014/34/EC (ATEX).
As part of this conformity assessment, an ignition
hazard analysis to EN 13463-1 to satisfy the
fundamental safety and health requirements was
conducted with the following result:
♦The valves do not have any ignition source of
their own and can be operated both manually
as well as mechanically/electrically.
♦The valves are not covered by the scope of
application of the ATEX directive and therefore
do not need to be identified accordingly.
♦The valves may be used in a potentially
explosive area.
Supplementary notes:
♦Electric/mechanical actuators must be
subjected to their own conformity assessment
to ATEX.
It is imperative to observe the individual points of
intended use for application in a potentially explosive
area.
3.1 Intended use
Improper operation, even for brief periods, may
result in serious damage to the valve.
In connection with explosion protection, potential
sources of ignition (overheating, electrostatic and
induced charges, mechanical and electric sparks)
may result from these improper operation; their
occurrence can only be prevented by adhering to
the intended use.
Furthermore, reference is made in this connection to
the Directive 95/C332/06 (ATEX 118a) which contains
the minimum regulations for improving the
occupational health and safety of the workers who
may be at risk from an explosive atmosphere.
A difference is made between two cases for the use of
chargeable liquids (conductivity < 10-8 S/m):

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1. Chargeable liquid and non-conductive lining
Charges can occur on the lining surface. As a
result, this can produce discharges inside and
outside the valve.
a) Discharges inside the valve
However, these discharges inside the valve cannot
cause ignitions if the valve is completely filled with
medium.
If the valve is not completely filled with medium,
e.g. during evacuation and filling, the formation of
an explosive atmosphere must be prevented, e.g.
by superimposing a layer of nitrogen. It is recom-
mended to wait 1 hour before removing the valve
from the plant in order to permit the elimination of
static peak charges.
This means that, to safely prevent ignitions, the
valve must be completely filled with medium at all
times or else a potentially explosive atmosphere
must be excluded by superimposing a layer of inert
gas.
b) Discharges outside the valve
At the points where the non-conductive lining e.g.
protrudes on the sealing surfaces to the outside or
gets contact with the atmosphere on the outside, it
may lead to discharges from the lining to nearby
valves or attachments.
To safely avoid explosion hazards and accidents,
therefore, the atmosphere surrounding the valve
must not be explosive.
2. Chargeable liquid and conductive lining
No hazardous charges can occur as charges are
discharged direct via the lining and shell (surface
resistance <109Ohm, leakage resistance <106
Ohm).
Static discharges of non-conductive linings are
only produced through the interaction with a
non-conductive medium and are therefore the
responsibility of the plant operator.
Static discharges are not sources of ignition
which stem from the valves themselves!
♦The temperature of the medium must not exceed
the temperature of the corresponding temperature
class or the maximum admissible medium temper-
ature as per the operating manual.
♦If the valve is heated (e.g. heating jacket), it must
be ensured that the temperature classes pre-
scribed in the Annex are observed.
♦For safe and reliable operation, it must be ensured
with regular inspection intervals that the unit is
properly serviced and kept in a perfect technical
condition.
♦Increased wear to the valve can be expected with
the conveyance of liquids containing abrasive
constituents. The inspection intervals are to be
reduced compared with the usual times.
♦Actuators and electric peripherals, such as
temperature, pressure and flow sensors etc., must
comply with the valid safety requirements and
explosion protection provisions.
♦The valve must be grounded.
This can be achieved in the simplest way via the pipe
screws using tooth lock washers.
Otherwise grounding must be ensured by different
measures e.g. a cable link.
♦Attachments such as actuators, position control-
lers, limit switches etc. must satisfy the relevant
safety regulations as regards explosion protection
and, if required, be designed in compliance with
ATEX.
♦Special attention must be paid to the appropriate
safety and explosion protection notes in the re-
spective operating manuals.
♦Plastic-lined valves must not be operated with
carbon disulphide.
4 Safety note for valves, certified to Clean Air Act (TA Luft)
Certificate / Manufacturer Declaration Validity is
dependent on the operating instructions being read
and observed.
♦Carry out regular maintenance intervals and check
the tightness of the screw connections and tighten
as necessary.

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5 Transport, storage and disposal
For all transport work, observe generally
accepted engineering practice and the
accident prevention regulations.
The valve is supplied with flange caps. Do
not remove them until just before installation.
They protect the plastic surfaces against dirt
and mechanical damage.
Handle the goods being transported with care. During
transport protect the valve against impacts and
collisions.
Directly after receipt of the goods, check the consign-
ment for completeness and any in-transit damage.
Do not damage paint protection.
5.1 Storage
If the valve is not installed immediately after delivery,
store them properly.
The valves be stored in a dry, vibration-free and well-
ventilated room at as constant a temperature as
possible.
Protect elastomers against UV light.
In general, a storage period of 10 years should not be
exceeded.
Die Einlagerung mit ganz geschlossenem
Klappenteller oder mit einem Öffnungswinkel
größer als 15 ist unzulässig.
5.2 Transport preparations
During transport the disc/stem unit must not project
beyond the body dimensions.
Actuated with lever
When the valve is in the closed position, the lever is to
lock in the first lever catch. This results in the
disc/stem unit being slightly opened.
Actuated by means of worm gear
When the valve is in the closed position, the disc/stem
unit is to be 10-15° open.
Actuator
When the valve is in the closed position, the disc/stem
unit is to be 10-15° open.
When the valve is in the closed position, the disc/stem
unit is to be 10-15° open.
Attach a locking plate on shut-off and control butterfly
valves with a single-acting actuator See also Section
6.4.1.and drawing in Section 5.4
Attach flange caps.
5.3 Return consignments
Valves which have conveyed aggressive or
toxic media rinse and clean before being
returned to the manufacturer's works.
It is imperative to enclose a safety information
sheet / general safety certificate on the field of
application with the return consignment.
Pre-printed forms are enclosed with the installation
and operating manual. Safety precautions and
decontamination methods are to be mentioned.
5.4 Transport securing

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5.5 Disposal
Parts of the valve may be contaminated with medium
which is detrimental to health and the environment
and therefore cleaning is not sufficient.
Risk of personal injury or damage to the
environment due to the medium!
♦Wear protective clothing when work is performed
on the valve.
♦Prior to the disposal of the valve:
▪Collect any medium, etc. which has escaped
and dispose of it in accordance with the local
regulations.
▪Neutralise any medium residues in the valve.
♦Separate valve materials (plastics, metals, etc.)
and dispose of them in accordance with the local
regulations.

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6 Installation
♦Examine valve for in-transit damage, damaged ball
valves must not be installed.
♦Before installation the valve and the connecting
pipe must be carefully cleaned to remove any dirt,
especially hard foreign matter.
♦During installation, pay attention to the correct
tightening torque, aligned pipes and tension-free
assembly.
Ensure that a remotely actuated actuator
cannot be accidentally switched on.
6.1 Installation possibilities
Series NKS/F - sandwich body
They are used for sandwich installation. The valve is
clamped between the two pipes.
Series NKL/F - lug-style body
They are suitable as an intermediate flange and dead-
end valve. They have flange bores to ISO 7005-2 PN
10 (DIN 2501 PN 10) or to ASME B 16.5 Class 150;
they permit independent bolting from each other.
On request, through holes can also be provided
instead of the tapped bores.
6.2 Flange caps and gaskets
Leave protective caps on the flanges until just prior to
installation.
If plastic sealing surfaces, e.g. on mating flanges
made of metal or enamel, can be damaged, use
PTFE-lined seals with a metal inlay. These gaskets
are available as special accessories in the Richter
range.
6.3 Direction of flow and
installation position
Installation is independent of the direction of flow.
Any fitting position can be chosen.
Except solids-containing liquids:
With solid containing media butterfly valves are
preferably installed with horizontally positioned stem
and bottom half of disc opening into flow direction.
6.4 Installation
♦Can the disc open in the pipeline?
For dimensions see Section 1.4.
♦Is the disc open 10 –15°?
♦Mount butterfly valve and gaskets.
♦Tighten the piping bolts crosswise and hand-tight.
♦By means of a test actuation ensure that the disc is
able to freely rotate.
♦With the disc slightly opened, tighten the piping
bolts crosswise. For tightening torques, see Sec-
tion 1.3.
Butterfly valves which are used as end
valves must be sealed with a blind flange at
the free connection end and appropriately
secured against unauthorised activation.
6.4.1 Additional advice for shut-off and
control butterfly valve with actuator
♦For single-acting actuators a locking plate has
been fitted into the bracket, blocking the stem at a
disc opening of 10 –15 .
♦Remove the locking plate 507 before the first test
actuation, screw in again hex. screw 901/1. Slightly
actuate the actuator.
Please pay attention to the drawing in Section 5.4
6.5 Grounding
One end of the grounding rope 532 is attached with a
hex. nut 920/1 and a tooth lock washer 936/1 to the
underside of the head flange.
The other end is metallically secured in the plant.

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7 Operation
7.1 Initial commissioning
Normally, the valves have been tested for leaks with
air or water. Prior to initial operation check cover
screws. For tightening torques, see Section 1.3.
Unless otherwise agreed there could be
residual amounts of water in the flow
section of the valve. This could result in a
possible reaction with the medium.
To prevent leaks, all connection screws should be
retightened after the initial loading of the valve with
operating pressure and operating temperature.
For tightening torques, see Section 1.3.
7.2 Improper operation and their
consequences
♦Do not operate the butterfly valve without valve
actuation. Otherwise the disc will be uncontrollably
set in motion by the medium flow.
♦Butterfly valves with a hand lever should never be
abruptly opened or closed. This can lead to water
hammer effects.
♦Dissipate thermal expansion volumes in shut-off
pipes.
♦If the plastic swells up due to the effect of the
medium, this can result in the functional parts
jamming.
♦Increased wear occurs in operation with solids
contents.
♦There must be no foreign matter on the sealing
surfaces.
♦Operation during cavitation leads to increased
wear.
♦Non-observance of the pressure-temperature
diagram can lead to damage.
♦Do not subject the lever to heavy loads; the lever
or valve may be damaged.
♦Do not use a lever extension as otherwise there is
a risk of damage.
7.3 Shutdown
Before loosening the flange bolts:
♦ensure plant to be free of pressure
♦flush out medium
♦observe safety regulations
Prior to starting any repair work, the valve is to be
thoroughly cleaned. Medium residue may be in the
valve even if it has been properly drained and flushed.
After dismantling, immediately protect the valve
flanges against mechanical damage by using flange
caps. See also Section 6.2.
7.3.1 Additional advice for shut-off and
control butterfly valve with actuator
Ensure that a remotely actuated quarter-turn
actuator cannot be accidentally switched on.
♦Having dismounted the valve, mount the locking
plate 507 and screw together with hex. screw
901/1
See also Section 6.4.1.and drawing in Section 5.4
8 Malfunctions
♦Flange connection ball valve/pipe is leaking
Retighten the flange screws to a tightening torque
according to Section 1.3. If this does not remedy
the leak, the recommended torques may be ex-
ceeded by 10%.
If this also fails to stop the leak, remove the valve
and check the sealing surfaces.
♦Stem passage leaking
With no safety stuffing box:
Dismount valve and repair.
With safety stuffing box:
First of all, the packing gland follower can be
tightened.
For tightening torques, see Section 1.3.
Then dismount the valve as quickly as possible
and repair.
♦Medium leaking at the partition between lower and
upper halves
Dismount valve and repair, probably the stem seal
is not tight.
♦Valve does not switch
Has the locking plate been dismounted?
See Section 5.4.
Is the actuator supplied with power?
Has a directional control valve been correctly
connected?
Is there foreign matter in the valve?
♦The bore of the valve is leaking
Wear at the valve actuation ?
Do limit stops have to be adjusted?
Is the shaft deformed?
Deformation, damage or wear to body lining or
disc?

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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 incorrectly, individual
components of the valve may be
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!
♦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: →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.

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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 particular-
ly true for non-Newtonian fluids such as high polymer
substances, 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 stuffing 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 10.2 .
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 10.2 .
9.3.3 Proximity switch
The proximity switch reliably indicates the closed
position of the valve disc. The signal penetrates the
thick-walled lining.
9.4 Tests
Following tests would be done after the assembly.
Measurement of the breakaway torque
The breakaway torque required for opening and
closing the valve is to be ascertained. The maximum
torque should not exceed the values given in Section
1.8.
Tightness of valve opening and shaft bushing
The completed valves have to undergo a „leak test of
the closure with air“.
The tightness of the shaft bushing (stuffing box) of
each valve is tested. The holding time begins once
the residual air has escaped from the stuffing box
chamber.
The tightness of the shaft bushing (stuffing box) of
each valve is tested. The holding time begins once
the residual air has escaped from the stuffing box
chamber.
Tightness is verified according to DIN EN 12266-1
respectively MSS SP-67.
For detailed installation and inspection regulations for
shut-off and control butterfly valves, see QM No.
0910-08-1005, available from Richter on request.

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10 Drawings
10.1 Legend
120 shell
221 disc/stem unit
229 guide pin
(up to. DN 150 / 6“ inclusive)
300 plain bearing
400/1 O-Ring
405 thrust ring
409 body lining
412 pressure gasket
507 Retaining plate
(see drawing in section 5.4)
518 cup spring assembly
521 flexible inlay
532 grounding rope
901/x Hex. screw
914/1 hex. socket screw
918/1 threaded rod (series NKL)
920/2 hex. nut (series NKL)
920/1 hex. nut
936/1 toothed lock washer
938/1 hex. head screw plug
lever assembly
235 lever assembly
517 scraper ring
519 throttling plate
901/2 Hex. screw
920/1 hex. nut
Actuated by means of worm gear
857 gear
Actuator
510 bracket
517 scraper ring
804 Coupling
850 actuator
980/2 round head grooved pin
Option safety stuffing box lever assemly
402/1 Packing ring
413 sealing foil
503 Spring gland follower
550 disc
901/3 hex. screw
Option safety stuffing box worm gear
402/1 Packing ring
413 sealing foil
503 Spring gland follower
510 bracket
550 disc
804 Coupling
850 actuator
901/3 hex. screw
980/2 round head grooved pin
Option safety stuffing box actuator
402/1 Packing ring
413 sealing foil
503 Spring gland follower
550 disc
901/3 hex. screw
Option monitoring connection
407/1 seal ring
938/1 hex. head screw plug

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10.2 Sectional drawing NKS/F, DN 50 –150, 2"–6"
Wafer-style body, with lever assembly, disc/stem unit PFA-lined
* Only with option safety stuffing box.

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10.3 Sectional drawing NKS/F, DN 200-400, 8"-14"
Wafer-style body, with lever assembly, disc/stem unit PFA-lined
DN 250-400, 10"-14" standard with worm gear
* Only with option safety stuffing box.

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10.4 Sectional drawing NKL/F, DN 50 –150, 2"–6"
Lug-style body. with lever assembly, disc/stem unit PFA-lined
* Only with option safety stuffing box.