NK, NKS, NKL

Richter PTFEShut-off and ControlButterfly Valves

• Body Lining PTFE*• Disc/stem unit PFA* or stainless steel/Hastelloy *(e.g. Teflon®, Dyneon®)

2

NK, NKS, NKL

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Fields of applicationRichter butterfly valves haveproved successful inthousands of installations ina wide variety of processplants.• Shut-off, throttling and

control of corrosive and pure liquids, gases and vapours.

• Also suitable for free-flowing, low-abrasive bulkmaterials in the version with the metallic disc/stem unit.

• FDA-compliant, wetted materials permit use in food processing, pharmaceutical and similar applications.

• The short face-to-face butterfly valves are advantageous in confinedspaces - e.g. under vessels.

• Butterfly valves are economical valves:easy to install and dismantle, low-priced.

Operating range• operating temperature

-60 to + 200°C(-75 to + 400°F)

• operating pressure0.1 mbar vacuum to 10 bar(0.00145 psia to 145 psig)

Product features• Soft-sealing and gas-tight,

both with lined and metallic disc/stem units

• Leak-tight to the atmosphere in line with the requirements of the ”TA-Luft” (German Clean Air Act) at DN 50 -300 (2”- 12”) with optional safety stuffing box

• Leakage rate in the seat toDIN 3230 Part 3, leakage rate 1: gas-tight

• Short face-to-face:ISO 5752 series 20,API 609 Table 1,MSS SP-67 Table 3

• Flanges (with lug-style anddouble-flange bodies) forconnection to ISO 7005-2PN 10, ANSI B16.5 Class 150, JIS R 2210-10K

• Almost equal-percentage characteristics

• Anti-adhesive wetted surfaces thanks to PFA / PTFE

• External corrosion protection: epoxy coating,stainless steel nuts and bolts

• Identification of the valvesto DIN EN 19, ANSI B16.34

• Actuation:• hand lever, lockable• worm gear with

handwheel• pneumatic/electric

actuators• valve with centering

according to ISO 5211

or alternatively• made of metallic

materials• stainless steel 1.4408

(≈316) investment cast or Hastelloy C4 (2.4610)

• polished sealing surfaces,thus very low friction values

• polished disc surfaces onrequest

• other materials(e.g. Alloy) on request

Wide sealing surfaces ofthe body lining for reliablesealing even with matingflanges with large radii, e.g.glass-lined components.

Teflon®, Kalrez®, Viton®: TM of DuPontDyneon®: TM of DyneonRichter: TM of ITT RichterITT Industries: TM of ITT Industries

Thick-walled virgin PTFElining of the valve body• Lining thickness 3 - 3.5 mm• High permeation

resistance• Vacuum-tight• Optionally antistatic lining

for explosion-hazardous applications

Pressure-bearing bodymade of ductile cast ironEN-JS 1049 (formerly:0.7043, GGG-40.3), PN 10• absorbs system and piping

forces• centers the valve in the

pipe

Disc/stem uniteither• lined with virgin PFA

fluoroplasticThe combination of a PFAdisc/stem unit with a PTFEbody provides very low friction and torques during the opening and closing processes, minimum wear and a longservice life

• Optionally antistatic PFA lining

Depending on the bodyversion, these butterflyvalves can be installed• as a wafer-style

butterfly valve (”sandwich-type butterfly valve”) with all three body designs or

• as a flange or dead-endbutterfly valve with lug-style and double-flange body.

Type code, wetted materialsmanual actuation:NK/... Double-flange bodyNKS/... Wafer-style (sandwich) bodyNKL/... Lug-style body

remote actuation:NKP/... Double-flange bodyNKSP/... Wafer-style (sandwich) bodyNKLP/... Lug-style body

.../F Lining PTFE, disc/stem unit PFA

.../F-L Lining PFA/PTFE antistatic

.../...-S Alternative disc/stem unit of stainless steel

.../...-H Alternative disc/stem unit of Hastelloy C4

NK, NKS, NKL

3

530

402

550

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Stem sealing• Maintenance-free and

self-adjusting,therefore reliable even with many switching cycles and fluctuating temperatures.

Long valve neckpermits optimum heatinsulation without theinstallation of an elevatedlever. Additional stemextensions on request.

Safetystuffing box(on request)

Monitoringconnection(on request)

Lug-style body NKLDN 50-400 (2-16”)

• Optional safety stuffingboxfor use with environmen-tally hazardous media, life-loaded, independently acting, can be adjusted manually from outside, onrequest with monitoring connection.

Double-flange body NKDN 50-300 (2-12”)

Wafer-style body NKSDN 50-400 (2-16”)

NK, NKS, NKL

4

e

g

u

m

804

ec b

pH

rt

s k

I

hH

a

g

H

804510 503/550

H

DN

K

Ø S

SW

n x

d

M

F

L T

EC

BH

A

L

F G

850

510

857

235

857

502”43

1357266284

1254 x 194 x M16120,54 x 194 x 5/8”

9039

301410153,54,54

803”46

160899367

17,5160

8 x 198 x M16152,54 x 194 x 5/8”128

310301611154,57,55

1004”52

17510010687

24,5180

8 x 198 x M16190,58 x 198 x 5/8”150

313302012166

9,57,5

1506”56

21212813514248

2408 x 238 x M20241,58 x 228 x 3/4”212

31436251820111612

2008”60

23216516519371

2958 x 238 x M20298,58 x 228 x 3/4”265

316362518201523

19,5

25010”6827219519524392350

12 x 2312 x M20

36212 x 2612 x 7/8”

3154

1642302225253529

30012”78297225230292112400

12 x 2312 x M20

43212 x 2612 x 7/8”

3654

20433222253354

47,5

40016”102360282

-389150515

16 x 2816 x M24

54016 x 29,516 x 1”480

4–

504030356997–

35014”78

335258

-343137460

16 x 2316 x M20

47612 x 29,512 x 1”430

4–

503525354768–

502”60

F07

803”60

F07

1004”60

F07

1506”80

F10

2008”80

F10

25010”80

F12

30012”80

F12

35014”100

F14

40016”100

F14

502”1613244167

104120

803”5

224782

126197264282

1004”11275293

155247412456

1506”3784

164276431702

11261254

2008”62

170354532912

137122122503

25010”85285512882

1451225636924083

30012”159421835

13782282363357356512

40016”295780

1550256042406750

1065012100

35014”230610

121020003300527083209450

502”65

300400,7

803”65

300400,7

1004”60

300400,7

1506”70

500483,7

2008”70500483,7

25010”

30012”

35014”

40016”

502”73514560

1008727

18162

102122

4

803”73514560

1508727

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102122

4

1004”73514560150872718162102122

4

1506”7363458015010727181621251424,5

2008”73634580

15010727

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1251424,5

25010”105697080

25012040

20689

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30012”105697080

25012040

20689

1301699,5

35014”12610086

10025014242

22690

20019015

40016”12610086

10025014242

22690

20019015

502”20

100

803”46

180

1004”63

360

1506”

128725

2008”

185775

25010”287

1435

30012”410

1775

35014”550

3000

40016”650

3500

0,32 0,3 0,29 0,26 0,23 0,19 0,16 0,120,14

Connecting dimensions, flow rates, torquesInstallation dimensions (mm) and approx. weights (kg)

DNinch

LH

B NKS/NKLB NK

ET

K [ISO]nxd[ISO]1)

n2)

K [ANSI]nxd[ANSI]1)

n 2)

CF

G*A

Ø SSWM

Weight NKS NKL NK

An

gle

of

op

enin

g

kv-values (m3/h)

Flow rates and z-values

Connecting dimensions (mm) for remotely actuated design

Hand lever dimensions (mm) and approx. weights (kg)

DNinch

gConn.dim.*

DNinch

alh

Weight

Worm gear dimensions (mm) and approx. weights (kg)DNinch

bcegkmprstu

Weight

Torques (Nm)DNinchMd

Mdadm

Mdadm. = max. admissible torque (Nm) with the disc/stem unit blocked

Test medium fortorques:Water 20°C (68 °F).The torques may behigher depending onthe medium, e.g. drygases or viscous orcrystallising liquids.

Connection worm gear with handwheel in standard versionand in the version ”with safety stuffing box“.

As the distance between the centre of gravity and the butterfly valveincreases, the actuator exerts an increasing bending moment on thestem. Admissible actuator weights on request.

Wafer-style body (series NKS/NKSP): DIN 50-400 (2-16”)Lug-style body (series NKL/NKLP): DIN 50-400 (2-16”)Double-flange body (series NK/NKP): DIN 50-300 (2-12”)

Connection toDIN / ISO 5211

*to DIN / ISO 5211

Conversion to Cv = kv x 1,165 (US gpm) = kv x 0,971 (lmp gpm)

Flange connecting dimensions to ISO 7005-2 PN10 and ANSI B 16.5 Cl. 1501) Flange through holes 2) Tapped holes metric or UNC* Dimension G only applies to double-flange bodiesWeight with bare shaft end (without lever, bracket, etc.)

z-values at 75 % flow

Worm gear

20°30°40°50°60°70°80°90°

DNinch

NK, NKS, NKL

5

517

300

412521

409

519

518

400

405

413

300

229

221

120

235

300517

510

850

804

558 ISO 52115

10,5

0,1

10

50100

5001000

0

2

4

6

8

10

-60 0 100 20016012020

0,0725

0,01450,00725

0,00145

0,145

0,7251,45

7,2514,5

0

30

60

85

115

145-75 30 210 40032025070

Pressure / temperature range

Temperature in °C

Vac

uu

m in

mb

arG

aug

e p

ress

ure

in b

ar

Components and materials

Proximityswitch

Body lining

Flexibleinlay

Shell

Disc

Vac

uu

m in

psi

aG

aug

e p

ress

ure

in p

sig

Temperature in °F

Pulse generator under thedisc lining

Proximity switchThe proximity switch reliably indicates the closed position of thevalve disc. Available for PFA-lined disc.

Designation Standard design Special designShell Ductile cast iron EN-JS 1049 (0.7043) / ASTM A395Disc/stem unit, one-piece PFA/stainless steel, stainless steel 1.4408 (≈316 L) PFA antistatic, Hastelloy C4 (2.4610)Guide pin (DN≤150/6”) Stainless steelHand lever Ductile cast iron EN-JS 1049 (0.7043) / ASTM A395Plain bearing PTFE-lined (triple bearing)O-ring Viton® (top and bottom) or equivalent Kalrez® or equivalentThrust rings Stainless steel (top and bottom)Body lining PTFE PTFE antistaticSealing foils – PTFE, standard in conn. with items 503/550Packing gland follower (see p. 3) – Stainless steelBracket Connection to DIN ISO 5211 and NAMUR Special design on requestScraper ring Fluorocaoutchouc - not given with safety stuffing box installedCup spring assembly Stainless steel (top and bottom)Throttling plate Stainless steelFlexible inlay Silicone Viton® or equivalentSafety stuffing box, base ring (see p. 3) – PTFE, stainless steelMonitoring connection (see p. 3) – Only in conjunction with items 503/505Grounding cable/strip Stainless steel, with double-flange body integrated into the flangesCoupling Stainless steel, connection to DIN 3337 Special design on requestActuator Pneumatic quarter-turn actuators Pneumatic or electric actuators

e.g. Richter RA, bar, Norbro, El-o-matic, AMG, Hytork etc. of various makesWorm gear with handwheel Body grey cast iron with epoxy coating Body ductile cast iron, aluminium.(not illustrated, see p. 4) shaft with O-ring,

stainless steel shaft and boltsDisplay of the closed position (see above) – Proximity switch, pulse generatorStem extension, not illustrated – Design on requestNuts, bolts and washers Stainless steel

Item120221229235300400405409413503510517518519521550

558804850

857

6

ITT Richter Chemie-Technik GmbHOtto-Schott-Straße 2D-47906 KempenTel. +49 (0) 21 52 / 146 - 0Fax +49 (0) 21 52 / 146 - 190www.itt-richter.de

NK, NKS, NKL

Presented by:

Publ

icat

ion

No

139e

1.0

2

Subject to change withoutnotice.Printed in Germany.©ITT Richter Chemie-TechnikGmbH.

Installation examples

Glass

On request collar bushinginstead of tapped hole

Metal

Depending on the bodyversion, the butterfly valvescan be installed• as a wafer-style

butterfly valve (”sandwich-type butterfly valve“) with all three body designs or

• as a flange-mounted or dead-end butterfly valve with lug-style and double-flange body.

See page 5 for flange holesand threads for connectionto ISO, ANSI and JIS.

Wafer-style bodyThe flangeless butterfly valveis fixed between 2 flanges bypipe bolts.

Lug-style bodyThe lugs are providedalternatively with• Through holes:

The butterfly valve is centered in the holes by the pipe bolts and securedby the pipe flanges.

Double-flange bodyFlanges alternatively with• Through holes:

The valve is centered as a wafer-style butterfly valve by means of the pipe boltsin the holes. Alternatively, it can be installed as a dead-end valve with a nutinserted between the valveflanges.

• Tapped holes:The butterfly valve is installed as a dead-end valve or flange-mounted valve. The pipe side to be dismantled can be removed without any axial displacement, the butterfly valve acts as a dead-end valve.

• Tapped bores:The valve is installed as a dead-end or flange-mounted butterfly valve. The pipe side to be dismantled can be removed without any axialdisplacement.

• Glass connection:On the glass side, tapped holes or through holes with collar bushing.