Richter NKL-C 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
9520-022-en Revision 16 Edition 05/2022
Series NKS-C, NKSP-C, NKL-C, NKLP-C
Richter Shut-off and
Control Butterfly Valve
Lug-style body: Series NKL-C
Wafer-style body: Series NKS-C

9520-022-en Revision 16
TM 10477 Edition 05/2022
List of Contents
List of Contents .................................................... 2
Relevant documents............................................. 2
1Technical data ................................................ 3
1.1 Overview of sizes ............................................4
1.2 Type codes .........................................................4
1.3 Name plate, CE and body markings ...................5
1.4 Tightening torques ............................................. 6
1.5 Dimensions - Installation....................................8
1.6 Flow rate value kv [m³/h]..................................8
1.6.1 Disc/stem unit PFA-lined.........................................8
1.6.2 Disc/stem unit stainless steel, Hastelloy, Titan........9
1.7 Weights (ca. kg).................................................9
1.8 Breakaway torques ..........................................10
1.9 Cavitation coefficient z for 75% duty ...............10
1.10 Pressure-temperature-diagram .......................10
2Notes on safety............................................. 11
2.1 Intended use ....................................................11
2.2 For the customer / operator ............................ 11
2.3 Improper operation.......................................... 11
3Safety notes for applications in potentially
explosive areas based on the Directive
2014/34/EU (ATEX)....................................... 12
3.1 Intended use ....................................................12
4Safety note for valves, certified to Clean Air Act
(TA-Luft)....................................................... 14
5Transport, storage and disposal .................... 14
5.1 Storage .............................................................14
5.2 Transport preparations ....................................14
5.3 Return consignments .......................................14
5.4 Transport securing device................................14
5.5 Disposal ............................................................ 15
6Installation ................................................... 15
6.1 Installation possibilities.................................... 15
6.2 Flange caps and gaskets................................... 15
6.3 Direction of flow and installation position......15
6.4 Installation........................................................ 15
6.4.1 Additional advice for shut-off and control butterfly
valve with actuator................................................15
6.5 Earthing............................................................15
7Operation..................................................... 16
7.1 Initial commissioning........................................16
7.2 Improper operation and their consequences ..16
7.3 Shutdown .........................................................16
7.3.1 Additional advice for shut-off and control butterfly
valve with actuator................................................16
8Malfunctions ................................................ 17
9Maintenance ................................................ 17
9.1 Notes for assembly...........................................17
9.2 Valve actuation.................................................18
9.2.1 Actuated with lever...............................................18
9.2.2 Actuated by means of worm gear .........................18
9.2.3 Remotely actuated................................................18
9.2.4 Required breakaway torque..................................18
9.3 Tests .................................................................18
10 Drawings ...................................................... 19
10.1 Legend..............................................................19
10.2 Sectional drawing NKS-C .................................19
10.3 Sectional drawing NKL-C ..................................20
10.4 Worm gear .......................................................20
10.5 Actuator............................................................21
10.6 Connection actuator.........................................21
10.7 Dimensional drawing NKS-C with hand lever .22
10.8 Dimensional drawing NKS-C with worm gear ..23
10.9 Dimensional drawing NKSP-C...........................24
10.10 Dimensional drawing NKL-C with hand lever26
10.11 Dimensional drawing NKL-C with worm gear..
......................................................................27
10.12 Dimensional drawing NKLP-C ......................28
Relevant documents
EG-Declaration of conformity
Manufacturer Declaration ATEX Directive
2014/34/EU
Certification of leakage rate
Form for Safety Information Concerning the Con-
tamination QM 0912-16-2001_en
For NKLP-C or NKSP-C, operating manual for actu-
ator

Series NKS-C, NKSP-C, NKL-C, NKLP-C Page 3
9520-072-en Revision 15
TM 9549 Edition 08/2016
1 Technical data
Manufacturer:
Richter Chemie-Technik GmbH
Otto-Schott-Str. 2
D-47906 Kempen
Telephone: [phone]
Fax: [phone]
E-Mail : [email protected]m
Internet: http://www.richter-ct.com
Designation:
Shut-off and control butterfly valve with lug-style and
wafer-style
Disc/stem unit plastic-lined, stainless steel, Hastelloy
or Titanium
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, shape B, (ISO 7005-2 type B) PN 10
or ASME B16.5 class 150 (50“-24“) and ASME B16.47
Class 150 (28”-42”)
Face to face:
DIN EN 558-1, basic series 20 (ISO 5752 series 20)
Dimensions and individual parts:
See Section 10
Materials:
Body material: Ductile cast iron EN-JS 1049 to DIN
EN 1563 (0.7043 DIN 1693)
Lining material: PTFE
.../F
PTFE modified .../F
PTFE modified antistatic …/F–L
Disc/stem unit:
PFA-lined ..–F
PFA-lined antistatic ..–L
Stainless steel 1.4404, 1.4470 ..–S
Hastelloy C22 ..–H
Titanium Grade 2 ..–T
Temperature range: -20 °C to +200 °C
(-4 °F to +400 °F)
accord. to operating pressure
See pressure-temperature diagram in Section 1.10.
Operating pressure:
10 bar (145 psig) DN 50-600)
6 bar (85 psig) DN 700-1000
accord. to operating pressure
Options:
Polished disc surfaces
Weights: See table in Section 1.7
Dimensions and single components:
See dimensional drawings in Section 10

Series NKS-C, NKSP-C, NKL-C, NKLP-C Page 4
9520-022-en Revision 16
TM 10477 Edition 05/2022
1.1 Overview of sizes
Series
Actuation
/F
/F-L
/F-S
/F-H
/F-T
/F-L-S
/F-L-H
/F-L-T
Body design
NKS-C
Lever
DN 65, 125
2½", 5"
DN 65, 125
2½", 5"
DN 50-200
2"-8"
DN 50-200
2"-8"
Gear
DN 65, 125,
350-400
2½", 5", 14"-
16"
DN 50-300
2"-12"
DN 50-300
2"-12"
NKSP-C
Actuator
connection to ISO
5211
NKL-C
Lever
DN 65, 125
2½", 5"
DN 65, 125
2½", 5"
DN 50-200
2"-8"
DN 50-200
2"-8"
Gear
DN 65, 125,
450-1050
2½", 5", 18"-42"
DN 65, 125,
350-600
2½", 5", 14"-
24"
DN 50-1000
2"-40"
DN 50-600
2"-24"
NKLP-C
Actuator
connection to ISO
5211
1.2 Type codes
Series Code
NKS-C/F wafer-style body NKS-C
NKL-C/F lug-style body NKL-C
Body lining Code
PTFE F 
PTFE modified T 
PTFE modified antistatic TL 
PTFE modified antistatic FDA TF 
UHMW-PE E 
Material disc/stem unit Code
PFA lined F 
PFA lined, antistatic L 
Stainless steel 1.4404, 1.4470 S 
Polished disc surfaces Hastelloy C22 H 
Polished disc surfaces Titanium Grad 2 T 
Polished disc surfaces Stainless Steel ST 
Indicate valve size
DN 50, 80, 100, 125 ……2)
Flange connection Code
ISO 7005-2 PN 10 tapped hole NKL-C 1a 
Through hole ISO NKL-C 1 
ASME B16.5 or B.16.47 CL150
Tapped hole. NKL-C 2b 
Through hole ASME NKL-C 2 
JIS R 2210-10K NKL-C 4 
No tapped or through holes NKS-C _ 
NKS-C from DN 350 is NKL-C
with through holes ISO NKS-C1 
with through holes ASME NKS-C2 
Body material Code
Ductile cast iron EN-JS 1049 G 
Stainless steel S 
C-steel C 
CF-GF- compound Vinylester V 
(DN 50-300)
Flexible inlay Code
Silicon S 
FKM (Viton or equal) V 
FDA-FKM F 
Actuation Code
Lever lockable H 
Worm gear, with hand wheel S 1)
Without actuation O 
Data on name plate Code
°C/bar C 
°F/psi F 
Standard
1) Standard up to DN 250
Option
2) In the certificates and „Order-related Specification“ the
sizes are spezified in DN (mm).

Series NKS-C, NKSP-C, NKL-C, NKLP-C Page 5
9520-022-en Revision 16
TM 10477 Edition 05/2022
Order example NKS-CTLL80−GSHC
Order example
NKS-C
TL
L
80
−
G
S
H
C
Series
NKSP-C
Body lining
TL
Disc/stem unit
L
Valve size
80
Flange connection
−
Body material
G
Flexible inlay
S
Actuation
H
Type plate
C
1.3 Name plate, CE and body markings
The stainless steel name plate is undetachably rivet-
ed to the body.
If the operator attaches his identification, it must be
ensured that the valve matches the application in
question.
Example of name 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
Cast date
Sign for transport securing device for actuator

Series NKS-C, NKSP-C, NKL-C, NKLP-C Page 6
9520-022-en Revision 16
TM 10477 Edition 05/2022
1.4 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 ex-
ception, see Section 8, flange connection valve/pipe
is leaking.
The following tightening torques are recommended:
Pipe screws, flanges to ISO/DIN
Standard threaded hole
Flange nom.
size
Screws
Tightening torque
[mm]
[ISO/DIN]
[Nm]
50
4 x M16
35
65
8 x M16
40
80
8 x M16
45
100
8 x M16
50
125
8 x M16
60
150
8 x M20
70
200
8 x M20
85
250
12 x M20
95
300
12 x M20
105
350
16 x M20
145
400
16 x M24
165
450
20 x M24
185
500
20 x M24
215
600
16 x M27
230
700
24 x M27
280
750
---
---
800
24 x M30
380
900
28 x M30
460
1000
28 x M33
460
1050
---
---
Pipe screws flanges ISO/DIN drilled to ASME Class
150 Standard threaded hole
Flange nom.
size
Screws
Tightening
torque
[mm]
[inch]
[ASME]
[Nm]
[in-lbs]
50
2“
4 x ⅝“-11UNC
35
310
65
2½“
4 x ⅝“-11UNC
40
354
80
3“
4 x ⅝“-11UNC
45
398
100
4“
8 x ⅝“-11UNC
50
442
125
5"
8 x ¾“-10UNC
60
532
150
6“
8 x ¾“-10UNC
70
620
200
8“
8 x ¾“-10UNC
85
753
250
10“
12 x ⅞“-9UNC
95
842
300
12“
12 x ⅞“-9UNC
105
931
350
14“
12 x 1“-8UNC
145
1285
400
16“
16 x 1“-8UNC
165
1463
450
18"
16 x 1⅛“-7UNC
185
1640
500
20"
20 x 1⅛“-7UNC
215
1906
600
24"
20 x 1¼“-7UNC
230
2039
700
28"
28 x 1¼“-7UNC
280
2482
---
30"
28 x 1¼“-7UNC
300
2660
800
32"
28 x 1½“-7UNC
380
3369
900
36"
32 x 1½“-6UNC
460
4078
1000
40"
36 x 1½“-6UNC
460
4078
1050
42"
36 x 1½“-6UNC
500
4433
Pipe screws, flanges to ISO/DIN, through hole
NKS-C+NKSP-C from size DN 350 (14") upwards with
lug-style body and through hole
Flange nom.
size
Screws
Tightening
torque
[mm]
[ISO/DIN]
[Nm]
50
4 x 18
35
65
8 x 18
40
80
8 x 18
45
100
8 x 18
50
125
8 x 18
60
150
8 x 22
70
200
8 x 22
85
250
12 x 22
95
300
12 x 22
105
350
16 x 22
145
400
16 x 26
165
450
20 x 26
185
500
20 x 26
215
600
20 x 30
230
700
24 x 30
280
750
---
---
800
24 x 33
380
900
28 x 33
460
1000
36 x 42
500
1050
---
---

Series NKS-C, NKSP-C, NKL-C, NKLP-C Page 7
9520-022-en Revision 16
TM 10477 Edition 05/2022
Pipe screws flanges ISO/DIN drilled to ASME Class
150, through hole
NKS-C+NKSP-C from size DN 350 (14") upwards with
lug-style body and through hole
Flange nom.
size
Through hole
Tightening tor-
que
[mm]
[inch]
[mm]
[Nm]
[in-lbs]
50
2“
4 x 19
35
310
65
2½“
4 x 19
40
354
80
3“
4 x 19
45
398
100
4“
8 x 19
50
442
125
5"
8 x 22
60
532
150
6“
8 x 22
70
620
200
8“
8 x 22
85
753
250
10“
12 x 26
95
842
300
12“
12 x 26
105
931
350
14“
12 x 29
145
1285
400
16“
16 x 29
165
1463
450
18"
16 x 32
185
1640
500
20"
20 x 32
215
1906
600
24"
20 x 35
230
2039
700
28"
28 x 35
280
2482
---
30"
28 x 35
300
2660
800
32"
28 x 42
380
3369
900
36"
32 x 42
460
4078
1000
40"
36 x 42
460
4078
1050
42"
36 x 42
500
4433
Body screws
Available screw sizes for butterfly valves with ductile
iron, carbon steel & stainless steel bodies
DN
body
style
bolt size
ISO4762
quantity
steel 8.8
stainless
steel
A4-70
tightening
torque
[Nm]
tightening
torque
[lb×in]
40
wafer
M8 x 40
2
√
√
11,3
100
40
lug
M8 x 40
2
√
√
11,3
100
50
wafer
M8 x 25
2
√
√
11,3
100
50
lug
M8 x 25
2
√
√
11,3
100
65
wafer
M8 x 20
2
√
√
11,3
100
65
lug
M8 x 35
2
√
√
11,3
100
80
wafer
M8 x 20
2
√
√
11,3
100
80
lug
M8 x 35
2
√
√
11,3
100
100
wafer
M10 x 25
2
√
√
22,9
203
100
lug
M10 x 40
2
√
√
22,9
203
125
wafer
M10 x 35
2
√
√
22,9
203
125
lug
M10 x 40
2
√
√
22,9
203
150
wafer
M10 x 40
2
√
√
22,9
203
150
lug
M10 x 45
2
√
√
22,9
203
200
wafer
M12 x 30
2
√
√
39
345
200
lug
M12 x 50
2
√
√
39
345
250
wafer
M16 x 40
2
√
√
96
850
250
lug
M16 x 60
2
√
√
96
850
300
wafer
M16 x 45
2
√
√
96
850
300
lug
M16 x 60
2
√
√
96
850
350
wafer
& lug
M16 x 60
4
√
√
96
850
400
wafer
& lug
M16 x 60
4
√
√
96
850
450
wafer
& lug
M16 x 60
4
√
√
96
850
500
wafer
& lug
M16 x 60
4
√
√
96
850
600
wafer
& lug
M16 x 70
6
√
√
96
850
700
wafer
& lug
M16 x 80
8
√
√
96
850
750
wafer
& lug
M16 x 80
8
√
√
96
850
800
wafer
& lug
M16 x 90
8
√
√
96
850
900
wafer
& lug
M20 x 90
6
√
√
187
1655
1000
&1050
wafer
& lug
M20 x 90
6
√
√
187
1655

Series NKS-C, NKSP-C, NKL-C, NKLP-C Page 8
9520-022-en Revision 16
TM 10477 Edition 05/2022
1.5 Dimensions - Installation
Nom. size
E1
T1
L2
Connection3
[mm]
[inch]
[mm]
[mm]
[mm]
50
2“
31
6
43
F07
65
2½“
48
11
46
F07
80
3“
63
17
46
F07
100
4“
90
27
52
F07
125
5"
118
38
56
F07
150
6“
137
47
56
F07
200
8“
189
71
60
F10
250
10“
239
92
68
F10
300
12“
290
112
78
F10
350
14“
328
125
92
F12
400
16“
377
146
102
F12
450
18"
417
164
114
F14
500
20"
477
184
217
F14
600
24"
560
215
154
F16
700
28"
665
264
154
F16
750
30"
716
289
154
F25
800
32"
767
314
154
F25
900
36"
860
360
154
F25
1000
40"
970
414
154
F25
1050
42"
1010
433
154
F25
1 See also Section 6.4, paragraph 1
2 Face to face to DIN EN 558-1, series 20 (ISO 5752, series 20) without DN 350
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.
1.6 Flow rate value kv [m³/h]
1.6.1 Disc/stem unit PFA-lined
Nom. Size
[mm] [inch]
Angle of opening
20°
30°
40°
50°
60°
70°
80°
90°
65
2½“
4
14
27
49
80
118
158
211
125
5"
28
74
145
244
392
563
754
985
300
12"
181
404
771
1329
2179
3083
4124
5315
350
14"
277
602
1139
2034
3335
4718
6312
8134
400
16"
393
856
1620
2893
4628
6711
8979
11571
450
18“
528
1148
2173
3414
5742
8535
12043
15519
500
20“
647
1434
2418
3980
6490
10268
14983
19308
600
24"
843
1861
3473
5706
9427
14140
19349
24807
700
28"
1050
2347
4324
7104
11737
17606
24246
30887
750
30"
1181
2675
4864
7991
13203
19804
27274
34744
800
32"
1353
3064
5570
9207
15120
22282
31433
39789
900
36"
1861
4394
7621
11817
19791
30783
44252
55653
1000
40"
2131
4827
8777
13792
23195
34480
50152
62690
1050
42"
2398
5431
9874
15516
26095
38790
56422
70528

Series NKS-C, NKSP-C, NKL-C, NKLP-C Page 9
9520-022-en Revision 16
TM 10477 Edition 05/2022
1.6.2 Disc/stem unit stainless steel, Hastelloy, Titan
Nom. Size
[mm] [inch]
Angle of opening
20°
30°
40°
50°
60°
70°
80°
90°
50
2“
2
7
14
28
46
69
92
124
65
2½“
4
14
27
49
80
118
158
211
80
3“
8
22
41
75
123
179
240
318
100
4“
17
48
91
160
259
375
502
660
125
5"
28
74
145
244
392
563
754
985
150
6“
39
97
194
316
503
717
958
1244
200
8“
85
202
415
658
1036
1463
1956
2523
250
10“
119
274
527
949
1484
2038
2727
3514
300
12“
181
404
771
1329
2179
3083
4124
5315
350
14“
277
602
1139
2034
3335
4718
6312
8134
400
16“
393
856
1620
2893
4628
6711
8979
11571
450
18"
528
1148
2173
3414
5742
8535
12043
15519
500
20"
647
1434
2418
3980
6490
10268
14983
19308
600
24"
843
1861
3473
5706
9427
14140
19349
24807
700
28"
1050
2347
4324
7104
11737
17606
24246
30887
750
30"
1181
2675
4864
7991
13203
19804
27274
34744
800
32"
1353
3064
5570
9207
15120
22282
31433
39789
900
36"
1861
4394
7621
11817
19791
30783
44252
55653
1000
40"
2131
4827
8777
13792
23195
34480
50152
62690
1050
42“
2398
5431
9874
15516
26095
38790
56422
70528
1.7 Weights (ca. kg)
Actuator see data of
the manufacturer.
Nom. size
Lug style body
Sandwich-
body
[mm]
[inch]
Open staff end
Lever
Gear
50
2“
5
3
0,8
2
65
2½“
7
4
0,8
2
80
3“
8,1
5
0,8
2
100
4“
10,8
6,3
1,1
2
125
5"
14,5
7,7
1,1
2
150
6“
15,8
10
1,4
3,9
200
8“
24,6
16,5
1,9
3,9
250
10“
33,3
24,5
1,9
3,9
300
12“
57
37
1,9
7,7
350
14“
87
87
--
7,7
400
16“
107
107
--
7,7
450
18"
152
152
--
13,5
500
20"
185
185
--
13,5
600
24"
254
254
--
31,5
700
28"
280
280
--
32,5
750
30"
300
300
--
31,5
800
32"
410
410
--
31,5
900
36"
460
460
--
31,5
1000
40"
480
480
--
37,5
1050
42“
500
500
--
37,5

Series NKS-C, NKSP-C, NKL-C, NKLP-C Page 10
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TM 10477 Edition 05/2022
1.8 Breakaway torques
Nom. size
Mderf
MdS
MdH
MdT
[mm]
[inch]
[Nm]
[Nm]
[Nm]
[Nm]
50
2“
26
159
103
105
65
2½"
36
159
103
105
80
3“
46
159
103
105
100
4“
60
335
216
222
125
5"
80
335
216
222
150
6“
110
608
393
402
200
8“
167
456
295
302
250
10“
278
664
457
469
300
12“
333
664
457
469
350
14“
450
1227
845
866
400
16“
500
1227
845
866
450
18"
600
2909
2004
2053
500
20"
650
2909
2004
2053
600
24"
890
6069
4181
4283
700
28"
1500
6069
4181
4283
750
30"
2000
10374
7147
7321
800
32"
2300
10374
7147
7321
900
36"
2700
10374
7147
7321
1000
40"
3400
10374
7147
7321
1050
42"
3600
10374
7147
7321
Mderf = incl. 10% safety MdH= Hastelloy stem *
MdS= Stainless steel stem * MdT= Titanium stem *
1.9 Cavitation coefficient z for 75%
duty
Nom. size
at kv/kvs = 75 %
[mm]
[inch]
z
50
2“
0,47
65
2½"
0,46
80
3“
0,47
100
4“
0,27
125
5"
0,29
150
6“
0,38
200
8“
0,29
250
10“
0,37
300
12“
0,33
350
14“
0,26
400
16“
0,22
450
18"
0,20
500
20"
0,19
600
24"
0,24
700
28"
0,29
750
30"
0,30
800
32"
0,30
900
36"
0,25
1000
40"
0,29
1050
42"
0,28
* Includes safety factor 1,5
1.10 Pressure-temperature-diagram
When used in the minus temperature range, the regulations applicable in the country in question must
be observed.

Series NKS-C, NKSP-C, NKL-C, NKLP-C Page 11
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2 Notes on safety
This operating manual contains fundamental information
which is to be observed during installation, operation and
maintenance.
It must therefore be read before installation and
commissioning!
For valves which are used in potentially explosive areas,
see Section 3.
Installation and operation 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 ball valve and they are to be kept fully legi-
ble.
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 ef-
fects.
Risk to the environment through leaks of hazardous sub-
stances.
2.1 Intended use
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 according to the DGRL and have a
corrosion-resistant plastic lining.
The field of application for the shut-off and control butter-
fly valves include:
Light and medium corrosive, pure and slightly solids-laden
liquids, vapours and gases
Materials in contact with the medium which are FDA-
compliant can be used for food and pharmaceutical feed-
stock 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 aggressive media, are
cheaper and beneficial for thorough valve cleaning.
With both body designs the butterfly valves can be in-
stalled as a wafer-style valve (sandwich-type butter-fly
valve).
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, leaks, damage to seal-
ing 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 (consult the manufac-
turer).
2.2 For the customer / operator
If a safety 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 operating conditions stipulated in the data sheet are
not exceeded in continuous operating mode.
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 unauthorized 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 reliability of the valve supplied is only
guaranteed if it is used properly in accordance with Sec-
tion 2.1 of this operating manual.
The operation limits specified on the identifica-
tion plate and in the pressure-temperature dia-
gram must under no circumstances be exceed-
ed.

Series NKS-C, NKSP-C, NKL-C, NKLP-C Page 12
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3 Safety notes for applications in potentially explosive areas based on
the Directive 2014/34/EU (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/EU (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 mechani-
cally/electrically.
The valves are not covered by the scope of application of
the ATEX directive and therefore do not need to be iden-
tified 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
Inadmissible modes of operation, even for brief periods,
may result in serious damage to the unit.
In connection with explosion protection, potential
sources of ignition (overheating, electrostatic and
induced charges, mechanical and electric sparks) may
result from these inadmissible modes of 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 min-
imum regulations for improving the occupational health
and safety of the workers who may be at risk from an ex-
plosive atmosphere.
A difference is made between two cases for the use of
chargeable liquids (conductivity <10-8 S/m):
1. Chargeable liquid and non-conductive lining
Charges can occur on the lining surface. As a result, this
can produce discharges inside the valve. However,
these discharges 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 ex-
plosive atmosphere must be prevented, e.g. by super-
imposing a layer of nitrogen.
It is recommended 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.
2. Chargeable liquid and conductive lining
No hazardous charges can occur as charges are dis-
charged direct via the lining and shell (surface re-
sistance 109Ohm, leakage resistance 106Ohm).
If non-conductive versions of individual components
are installed in the valve, it may restrict the permitted
ATEX zone and explosion subgroup when operating the
valve despite the conductive lining of the armor plating
(see “Technical rules for hazardous substances: Avoid-
ance of ignition hazards due to electrostatic charges”
(TRGS 727)).
In these cases, consult the manufacturer.
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 temperature as per
the operating manual.
➢If the valve is heated (e.g. heating jacket), it must be
ensured that the temperature classes prescribed in the
Annex are observed.
➢To achieve safe and reliable operation, it must be en-
sured in inspections at regular intervals that the unit is
properly serviced and kept in technically perfect order
➢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 tempera-
ture, 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 other action,
e.g. cable bridges.
➢Attachments such as actuators, position controllers,
limit switches etc. must satisfy the relevant safety regu-
lations as regards explosion protection and, if required,
be designed in compliance with ATEX.
➢Special attention must be paid to the appropriate safe-
ty and explosion protection notes in the respective op-
erating manuals.

Series NKS-C, NKSP-C, NKL-C, NKLP-C Page 13
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➢Plastic-lined valves must not be operated with carbon
disulphide.

Series NKS-C, NKSP-C, NKL-C, NKLP-C Page 14
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4 Safety note for valves, certified to Clean Air Act (TA-Luft)
On request, this valve can be supplied compliant with the
German Clean Air Code.
Certificate / Manufacturer Declaration Validity is depend-
ent on the operating instructions being read and observed.
In particular, servicing must be conducted at regular inter-
vals, and the bolted connections relevant for tightness
must be inspected and retightened if necessary.
5 Transport, storage and disposal
It is imperative, for all transport work, to ob-
serve generally accepted engineering practice
and the accident prevention regulations.
Handle the goods being transported with care. During
transport the valve must be protected against impacts and
collisions.
Directly after receipt of the goods, the consignment must
be checked for completeness and any in-transit damage.
Do not damage paint protection.
5.1 Storage
If the valve is not installed immediately after delivery, it
must be put into proper storage.
It should be stored in a dry, vibration-free and well-
ventilated room at as constant a temperature as possible.
Elastomers are to be protected against UV light.
In general, a storage period of 10 years should not be ex-
ceeded.
It is not permitted to put the valve into store with the disc
completely closed or with an opening angle greater than
15°.
5.2 Transport preparations
During transport the disc/stem unit must not project be-
yond the body dimensions.
Hand 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.
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.
Attach a locking plate on shut-off and control butterfly
valves with a single-acting actuator. See also Section
6.4.1 and the drawing in Section 5.4.
Mount flange caps.
5.3 Return consignments
Valves which have conveyed aggressive or toxic
media must be well rinsed and cleaned before
being returned to the manufacturer's works.
It is imperative to enclose a safety information
sheet / general safety certificate on the field of applica-
tion with the return consignment.
Pre-printed forms are enclosed with the installation and
operating manual.
Safety precautions and decontamination measures are to
be mentioned.
5.4 Transport securing device

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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 envi-
ronment 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 dis-
pose of it in accordance with the local regulations.
▪Neutralize any medium residues in the valve.
Separate valve materials (plastics, metals etc.) and dis-
pose of them in accordance with the local regulations.
6 Installation
Examine valve for in-transit damage, damaged diaphragm
valves may 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 can-
not be accidentally switched on.
6.1 Installation possibilities
Series NKS-C wafer-style body
They are used for sandwich installation. The valve is
clamped between the two pipes. From DN 350 upwards a
lug-style body with through holes is standard
Series NKL-C lug-style body
They are suitable as an intermediate flange and dead-end
valve.
On request, through holes can also be provided instead of
the tapped bores.
6.2 Flange caps and gaskets
Leave the original packaging on the valve until immediately
before installation.
NKS-C with TFM body lining does not need any gaskets.
If plastic sealing surfaces can be damaged, e.g. by mating
flanges made of metal or enamel, use PTFE-lined gaskets
with a metal inlay.
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 1.5.
➢Is the disc open 10 –15°?
➢Mount butterfly valve and gaskets centrically.
➢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 the torques see Section 1.4.
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 con-
trol 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 before the first test actua-
tion, screw in again hex. screw 901/1. Slightly actuate
the actuator.
Please pay attention to the drawing in Section 5.4.
6.5 Earthing
On request, the butterfly valves are supplied with an earth-
ing connection.

9520-022-en Revision 16
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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 body bolting. For
torques see Section 1.4.
Unless otherwise agreed, there could be residu-
al 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 retight-
ened after the initial loading of the valve with operating
pressure and operating temperature.
For torques see Section 1.4.
7.2 Improper operation and their con-
sequences
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.
Operation with solids leads to increased wear.
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 of the plastic lining.
If no monitoring is provided by the warning connection, do
not tighten safety stuffing box. Otherwise any leak cannot
be seen.
Do not apply heavy loads to the lever; the lever or butter-
fly valves may be damaged.
Do not use a lever extension as this could cause 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 thor-
oughly cleaned. Even if the valve has been properly emp-
tied and rinsed, residual medium may still be found in the
valve,
In addition to suitable protective clothing, wear working
gloves and goggles for assembly and maintenance work.
After dismantling, immediately protect the valve flanges
against mechanical damage with flange caps. See also
Section 6.2.
7.3.1 Additional advice for shut-off and con-
trol 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 in with hex. screw 901/1.
See also Section 6.4.1 and drawing in Section 5.4.

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8 Malfunctions
Flange connection ball valve/pipe is leaking
Retighten the flange screws to a tightening torque ac-
cording to Section 1.3. If this does not remedy the
leak, the recommended torques may be exceeded by
10%.
If this also fails to stop the leak, dismantle and inspect
the ball valve.
Dismount and inspect the valve.
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 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
Dismont 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 connect-
ed?
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?
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 connection screws
should be made in line with the operating requirements.
For torques see Section 1.4.
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 pump been shut down, drained and flushed ac-
cording to the regulations?
See also Section 7.3.
If assembled incorrectly, individual components
of the valve may be damaged and this can result
in malfunctions during operation.
9.1 Notes for 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 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 on-
ly to this point during later test switching.
➢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 1.4.

9520-022-en Revision 16
TM 10477 Edition 05/2022
9.2 Valve actuation
The disc/stem unit has a 2-surface pivot point on DN 50-
150 (2"- 6") and a 4-surface pivot point on DN 200-1000
(8"- 40") for mounting a hand lever or coupling.
Hand lever or 2/4-surface pivot point parallel to the pipe
axis: ➔Valve open
Hand lever or 2/4-surface pivot point at right angles to the
pipe axis: ➔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 10°
intervals. It is lockable with a commercially available pad-
lock.
9.2.2 Actuated by means of worm gear
In the standard version, the manufacturer normally pro-
vides worm gears with a special pick-up for the stem pivot.
The bracket and the coupling are thereby not required.
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 DIN EN 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 substances, sus-
pensions, 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 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“.

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10 Drawings
10.1 Legend
120 shell
221 disc/stem unit
313/x bearing and pressure package
409 body lining
521 flexible inlay
532 grounding rope
914/1 hex. socket screw
936/1 toothed lock washer
Lever unit
235 lever assembly
519 throttling plate
Worm gear
857 worm gear
Actuator
510 bracket
804 coupling
850 actuator
10.2 Sectional drawing NKS-C
Wafer-style body with hand lever

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10.3 Sectional drawing NKL-C
Lug-style body with hand lever
10.4 Worm gear