Control Products STEVI 450 User Manual

3-way control valve in mixing and diverting design

1/2“ - 6“

STEVI® 450 / 451

Electric actuator ARI-PREMIO

• Enclosure IP 65

• 2 torque switches

• 1 travel switch

• Handwheel

• Additional devices available,

e.g. potentiometer

STEVI® 450 / 451

with electric and pneumatic actuators

STEVI® 450 / 451

Pneumatic actuator DP32 - DP34

• Reversible pneumatic actuator

• Actuator with rolling diaphragm

• Air supply pressure max. 87 psi

• Stem protection by bellow

• Maintenance-free O-ring sealing

• Assembly of additional devices

acc. to DIN IEC 60534-6

Page 2

Fig. 450

Page 4

Edition 05/05 - Data subject to alteration

Fig. 451

Features:

• Compact design

• Precision guided stem

• Burnished stem

• Tapered seat ring

• Seat options available

• Reducible kvs-values

• Rangeability 30 : 1

• Guided plug

• Spring loaded PTFE-V ring packing unit

• Two-ply bellows seal

• Travel indicator

1

(Material and Figure-No.
refer to technical data
or part list.)

495-1124 lbf: 6.5 x 5.9
2698-3372 lbf: 7.9 x 6.9

495-1124 lbf: 1.9
2698-3372 lbf: 3.5

5.1

4.7

495-1124 lbf = ∅

2698-3372 lbf = ∅

STEVI® 450 / 451

with electric actuator ARI-PREMIO

Fig. 450

Fig. 451

Diverting construction from 1 1/2“ upwards
(further information refer to page 10)

Heights and weights

Size 1/2“ 3/4“ 1“ 1 1/4“ 1 1/2“ 2“ 2 1/2“ 3“ 4“ 5“ 6“

H (in) 22.2 22.2 22.4 23.4 23.6 23.5 25 25.6 26.3 29.1 31.5

495 lbf (2,2 kN)

1124 lbf (5 kN) 25.6/26.7 27.8/29.1 30/31.3 35.7/37.7 43/45.6 51.4/54.7 66.1/70.8 80.5/86.2 117/126 163/223 223/318

...450

H (in) 28.3 29.3 29.5 29.4 30.9 31.5 32.2 34.9 37.3

2698 lbf (12 kN)

3372 lbf (15 kN)

PN16/
PN25-40 (lb)

PN16/
PN25-40 (lb)

23.1/24.3 25.4/26.7 27.6/28.8 33.3/35.3 40.6/43.2 48.9/52.2 63.7/68.3 78/83.7 115/124/ 161/221 --

38.8/40.1 44.5/46.5 51.8/54.5 60.2/63.5 75/79.6 89.3/95 126/135 172/232 232/326

H (in) 29.5 29.5 29.6 30.7 30.3 30 34.2 34.7 35.4 43 44.3

495 lbf (2,2 kN)

1124 lbf (5 kN) 32.2/33.7 34.4/36.2 37/39 42.3/44.8 52.9/56.4 60/64.2 80/86 102/110 141/152 185/247 245/342

...451

H (in) 35.6 36.6 36.2 35.9 40.1 40.6 41.3 48.9 50.2

2698 lbf (12 kN)

3372 lbf (15 kN)

PN16/
PN25-40 (lb)

PN16/
PN25-40 (lb)

29.8/31.3 32/33.7 34.6/36.6 39.9/42.3 50.5/54 57.5/61.7 77.6/83.5 99.4/107 139/150 -- --

45.9/47.8 51.1/53.6 61.7/62.3 68.8/73 88.8/94.8 111/119 150/161 194/256 254/351

Other dimensions refer to page 9.

2

Edition 10/04 - Data subject to alteration

STEVI® 450 / 451

Closing pressures with ARI-PREMIO

max. permissible closing pressures for both seat positions on flow-to-open P2 = 0 (Observe pressure-temperature-limits on page 9)

Mixing

function

1)

Actuator

ARI-PREMIO
495 lbf
(2,2 kN)

1)

Actuator

ARI-PREMIO
1124 lbf
(5 kN)

1)

Actuator

ARI-PREMIO
2698 lbf
(12 kN)

1)

Actuator

ARI-PREMIO
3372 lbf
(15 kN)

Diverting

function

1)

Actuator

ARI-PREMIO
495 lbf
(2,2 kN)

1)

Actuator

ARI-PREMIO
1124 lbf
(5 kN)

1)

Actuator

ARI-PREMIO
2698 lbf
(12 kN)

1)

Actuator

ARI-PREMIO
3372 lbf
(15 kN)

I. Fig. 450: PTFE-V-ring unit; II. Fig. 450: Pure graphite packing; III. Fig. 451: Bellows seal

Size 1/2“ 3/4“ 1“ 1 1/4“ 1 1/2“ 2“ 2 1/2“ 3“ 4“ 5“ 6“

Seat-∅ A / B (in)

0.83/0.79 0.83/0.98 1.06/1.06 1.22/1.26 1.61/1.58 2.01/1.97 2.60/2.36 3.19/2.95 3.98/3.74 4.72/4.72 5.51/5.51

Standard Cv-values 4.6 7.3 12 18 29 46 73 116 185 289 370

Reduced Cv-values

3)

2.9 4.6 7.3 12 18 29 46 73 116 185 289

Tr av e l (in) 0.79 1.18 1.97

I. 580 521 446 314 186 116 63 38 22

Closing pressure (psi)

II. 580 488 418 294 173 107 56 34 119

III. 445 436 394 276 154 95 52 31 17

Operating time
(Operating speed 0.01 in/s)

2)

(s)

53 79

I. 580 580 580 482 308 179 115 72 49 35

Closing pressure (psi)

II. 580 580 580 469 300 172 111 69 47 33

III. 580 580 580 580 450 288 168 108 67 44 31

Operating time
(Operating speed 0.01 in/s)

2)

(s)

53 79 132

I. 580 580 468 308 196 137 100

Closing pressure (psi)

II. 580 580 462 303 193 135 98

III. 580 580 458 300 191 132 96

Operating time
(Operating speed 0.03 in/s)

2)

(s)

25 38 63

I. 580 390 249 175 127

Closing pressure (psi)

II. 580 386 246 173 126

III. 580 383 245 170 124

Operating time
(Operating speed 0.01 in/s)

2)

(s)

79 132

Size 1/2“ 3/4“ 1“ 1 1/4“ 1 1/2“ 2“ 2 1/2“ 3“ 4“ 5“ 6“

Seat-∅ A / B (in)

0.83/0.79 0.83/0.98 1.06/1.06 1.22/1.26 1.57/1.57 1.97/1.97 2.36/2.36 2.95/2.95 3.54/3.54 4.13/4.13 4.92/4.92

Standard Cv-values 4.6 7.3 12 18 16 29 52 69 110 197 231

Reduced Cv-values

3)

2.9 4.6 7.3 12 -- -- -- -- -- -- --

Tr av e l (in) 0.79 1.18

I. 372 261 223 157 194 119 78 46 30 19

Closing pressure (psi)

II. 349 244 209 147 181 111 70 41 26 17

III. 223 218 197 138 161 98 65 38 24

Operating time
(Operating speed 0.01 in/s)

2)

(s)

53 79

I. 580 580 558 397 502 318 217 136 92 65 44

Closing pressure (psi)

II. 580 580 543 387 488 309 209 131 89 62 42

III. 580 580 531 378 469 296 204 128 86 59 40

Operating time
(Operating speed 0.01 in/s)

2)

(s)

53 79

I. 580 580 580 580 564 360 248 179 125

Closing pressure (psi)

II. 580 580 580 580 556 355 245 176 123

III. 580 580 580 580 551 351 242 173 121

Operating time
(Operating speed 0.03 in/s)

2)

(s)

25 38

I. 580 456 315 228 160

Closing pressure (psi)

II. 580 451 312 225 158

III. 580 447 309 222 155

Operating time
(Operating speed 0.01 in/s)

2)

(s)

79

1)

Motor voltage: 230V 50/60Hz Special voltages: 24V 50/60Hz; 115V 50/60Hz

Technical data for actuator refer to data sheet ARI-PREMIO

2)

Indicated operating times with 50 Hz.

3)

Cv-value reducible on request (2 threaded seat rings required)

Edition 10/04 - Data subject to alteration

3

(Material and Figure-No.
refer to technical data
or part list.)

STEVI® 450 / 451

with pneumatic actuator DP 32 - 34

Fig. 451Fig. 450

Diverting plug 1 1/2“ upwards (further information refer to page 10)

Heights and weights

Size 1/2“ 3/4“ 1“ 1 1/4“ 1 1/2“ 2“ 2 1/2“ 3“ 4“ 5“ 6“

∅ A (in) 9.84

H (in) 17.7 17.7 17.9 18.9 19.1 19.1 20.5 21.1 21.9

...450

DP 32

DP 33

DP 34

Other dimensions refer to page 9.

PN16/PN25-40 (lb)

H (in) 25.0 25.0 25.2 26.2 25.8 25.6 29.7 30.2 30.9

...451

PN16/PN25-40 (lb)

∅ A (in) 11.81

H (in) 19.9 19.9 20.0 21.1 21.3 21.2 22.6 23.3 24.0 25.9 28.3

...450

PN16/PN25-40 (lb)

H (in) 27.2 27.2 27.3 28.3 28.0 27.7 31.9 32.4 33.0 39.8 41.1

...451

PN16/PN25-40 (lb)

∅ A (in) 15.94

H (in) 28.0 28.6 29.3 30.4 32.8

...450

PN16/PN25-40 (lb)

H (in) 37.2 37.7 38.3 44.4 45.7

...451

PN16/PN25-40 (lb)

31.1/32.2 33.3/34.6 35.5/36.6 41.2/43.2 48.5/51.2 56.9/60.2 71.6/76.3 86.0/91.7 124/132

37.7/39.2 39.9/41.7 42.5/44.5 47.8/50.3 58.4/62.0 65.5/69.7 85.5/91.5 107/115 146/159

44.3/45.4 46.5/47.8 48.7/50.0 54.5/56.4 61.7/64.4 70.1/73.4 84.9/89.5 99.2/105 137/146 181/243 243/337

50.9/52.5 53.1/54.9 55.8/57.8 61.1/63.5 71.6/75.2 78.7/82.9 98.8/105 121/129 159/172 203/265 265/359

151/156 165/171 203/212 247/309 309/403

165/171 187/195 225/238

269

/331 331/426

4

Edition 10/04 - Data subject to alteration

STEVI® 450 / 451

Closing pressures with DP

max. permissible closing pressures for both seat positions

on flow-to-open P2 = 0

(Observe pressure-temperature-limits on page 9)

Spring closes port A -> AB or Spring closes port B -> AB

Mixing

function

Size 1/2“ 3/4“ 1“ 1 1/4“ 1 1/2“ 2“ 2 1/2“ 3“ 4“ 5“ 6“

Standard Cv-values

Reduced Cv-values

2)

4.6 7.3 12 18 29 46 73 116 185 289 370

2.9 4.6 7.3 12 18 29 46 73 116 185 289

Tr av e l (in) 0.79 1.18 1.97

I. 80 47 38 21

3 - 15

17

II. 33 14

III.

I. 270 183 155 105 57 32

6 - 17 23

II. 224 150 126 84 44 23

III. 125 116 102 67 25

Actuator

DP 32

12 - 35 46

Control signal (psi)

22 - 36 58

Air supply pressure min. (psi)

I. 580 455 389 273 160 99

II. 580 422 360 252 147 91

III. 382 373 336 235 128 78

I. 580 580 567 341 217

II. 580 580 547 329 209

III. 580 580 580 530 310 197

I. 580 471 302

29 - 48 77

II. 580 458 293

III. 580 439 281

Actuator

DP 33

3 - 15

6 - 17 23

12 - 35 46

22 - 44 65

Control signal (psi)

25 - 39 64

c)

192

c)

146

a)

72

496c)344c)293c)204c)118

c)

449

277a)268a)241a)166

a)

580

580a)580a)580a)451a)270a)171

17

I.

II.

III.

I.

II.

III.

I.

II.

III. 580 580 580 434 251 158 90 57 34

I. 214 139 87

II. 207 134 84

III. 203 132 82

Air supply pressure min. (psi)

I.

II.

128c)107

c)

94

a)

63

311c)265c)184c)105

580a)580a)472a)283a)179

c)

70

c)

78

54

50

a)

33

580

580a)580a)412

c)

c)

a)

a)

a)

c)

35

23

86

18

c)

c)

72

c)

63

a)

51

580a)421

c)

c)

36 21

c)

30 16

a)

a)

26

a)

101 64 38

a)

94 59 36

a)

a)

III. 580 580 400

I. (580) 295 192 121

87

II. (573) 288 188 119

(87)

III. (561) 284 185 117

17

I.

II.

III.

I.

II.

III.

367

30

26

102

95

91

b)

b)

e)

b)

b)

d)

I. 232 150 94 65 46

II. 225 146 92 63 45

III.

I. (580) (431) (279) 134 98

65

II. (580) (426) (273) 132 96

(74)

III. 129 94

I. (495) (317) 184 134

87

II. (491) (315) 182 132

(87)

221

b)

Actuator

DP 34

29 - 58
(3 - 54)

3 - 15

6 - 17 23

12 - 35 46

Control signal (psi)

22 - 44
(31 - 44)

29 - 58
(35 - 52)

Air supply pressure min. (psi)

III. 179 130

I. Fig. 450: PTFE-V-ring unit; II. Fig. 450: Pure graphite-packing; III. Fig. 451: Bellows seal

Air supply pressure max. of pneumatic actuators DP: 87 psi
Air supply pressure max. limit of control valve: a) 73 psi b) 65 psi c) 58 psi d) 51 psi e) 44 psi

Higher closing pressures for Size 5“-6“ in connection with DP34T on request!

2)

Cv-value reducible on request (2 threaded seat rings required)

21

17

14

64

60

57

143

b)

b)

e)

b)

b)

d)

b)

b)

d)

b)

25 17

23 16

a)

21

60 43

39

36

34

b)

90

Edition 10/04 - Data subject to alteration

5

STEVI® 450 / 451

Closing pressures with DP

max. permissible closing pressures for both seat positions

on flow-to-open P2 = 0

(Observe pressure-temperature-limits on page 9)

Spring closes port A -> AB or Spring closes port B -> AB

Diverting

function

Size 1/2“ 3/4“ 1“ 1 1/4“ 1 1/2“ 2“ 2 1/2“ 3“ 4“ 5“ 6“

Standard Cv-values

Reduced Cv-values

2)

4.6 7.3 12 18 16 29 52 69 110 197 231

2.9 4.6 7.3 12 -- -- -- -- -- -- --

Tr av e l (in) 0.79 1.18

I. 40 24 19

3 - 15

17

II. 17

III.

I. 135 92 77 52 60 33 17.4

6 - 17 23

II. 112 72 63 42 47 25

III. 62 58 51 33 27

Actuator

DP 32

12 - 35 46

Control signal (psi)

22 - 36 58

Air supply pressure min. (psi)

I. 326 227 195 136 168 102 66 39 24 16

II. 302 211 180 126 154 94 58 34 21

III. 191 187 168 118 135 81 53 30 19

I. 580 465 399 284 356 224

II. 580 449 385 273 343 215

III. 416 412 373 265 323 203

I. 580 546 389 491 310

29 - 48 77

II. 580 531 378 477 302

III. 577 573 519 370 458 289

Actuator

DP 33

3 - 15

6 - 17 23

12 - 35 46

22 - 44 65

Control signal (psi)

25 - 39 64

c)

96

c)

73

a)

36

248c)172c)147c)102c)124

225

139a)134a)120

551

528a)372a)319a)226a)282a)176

17

I.

II.

III.

I.

II.

III.

I.

II.

III. 344 339 307 217 262 163 111 67 44 28 18

I. 259 163 111 79 54

II. 251 158 108 76 52

III. 246 155 105 73 50

I.

Air supply pressure min. (psi)

580

II.

580a)580a)580a)527a)580a)424

c)

64

c)

47

a)

32

c)

155c)132

a)

388a)333a)236a)295a)185

a)

580a)580a)537a)580a)433

c)

54

c)

39

a)

27

c)

35

c)

25

a)

16

c)

c)

92

a)

110

a)

83

c)

38

c)

25

a)

91

c)

19

c)

c)

74

c)

66

53

46 26 15

c)

38 21

a)

a)

33

a)

124 76 50 34 23

a)

116 71 47 32 20

a)

a)

III. 580 580 580 518 580 412

I. (580) (580) 356 225 155 111 77

87

II. (580) (580) 348 220 151 108 74

(87)

III. (580) (577) 343 217 149 104 72

17.4

I.

II.

III.

I.

II.

III.

47

39

34

125

117

112

b)

b)

e)

b)

b)

d)

I. 280 177 121 86 59

II. 272 172 117 83 57

III.

267

b)

I. 580 503 348 252 177

II. 580 498 345 249 175

III. 246 172

Actuator

DP 34

29 - 58
(33 - 54)

3 - 15

6 - 17 23

12- 35 46

Control signal (psi)

31 - 44 5

Air supply pressure min. (psi)

I. 578 401 290 204

35 - 52 6

II. 573 397 287 202

III. 284 199

I. Fig. 450: PTFE-V-ring unit II. Fig. 450: Pure graphite-packing III. Fig. 451: Bellows seal

Air supply pressure max. of pneumatic actuators DP: 87 psi
Air supply pressure max. limit of control valve: a) 73 psi b) 65 psi c) 58 psi d) 51 psi e) 44 psi

Higher closing pressures for Size 5“-6“ with DP34T on request!

2)

Cv-value reducible on request (2 threaded seat rings required)

a)

18

b)

26

21

18

76

71

68

16

b)

e)

b)

51

b)

47

d)

45

169b)115

b)

b)

b)

d)

b)

35 23

32 21

a)

28

80 55

a)

18

6

Edition 10/04 - Data subject to alteration

STEVI® 450 / 451

Cv-value chart

Size 1/2“ 3/4“ 1“ 1 1/4“ 1 1/2“ 2“ 2 1/2“ 3“ 4“ 5“ 6“

Cv Seat-∅ A / B (in)

0.83/0.79

2.9

0.83/0.79 0.83/0.98

4.6

0.83/0.98 1.06/1.06

1.06/1.06 1.22/1.26

1.22/1.26 1.61/1.57

1.61/1.57 2.01/1.97

2.01/1.97

2.60/2.36

2.60/2.36 3.19/2.95

3.19/2.95 3.98/3.74

3.98/3.74

4.72/4.72

4.72/4.72 5.51/5.51

0.83/0.98 1.06/1.06

1.06/1.06 1.22/1.26

1.57/1.57

1.22/1.26

1.97/1.97

2.36/2.36

2.95/2.95

3.54/3.54

4.13/4.13

Mixing valve

Diverting valve

7.3

12

18

29

46

46

73

116

185

185

289

370

0.83/0.79

2.9

0.83/0.79 0.83/0.98

4.6

7.3

12

16

18

29

52

69

110

197

231

Cv-value chart

Travel

(in)

0.79

1.18

1.97

5.51/5.51

0.79

1.18

4.92/4.92

Edition 10/04 - Data subject to alteration

7

STEVI® 450 / 451

Parts

Figure

PN16 - 12.4504) / 12.451

PN16 - 22.450 / 22.451

4)

PN25 - 23.450

4)

/ 23.451

PN25 - 34.450 / 34.451

4)

PN40 - 35.450 / 35.451 PN40 - 55.450

Pos. Description Material codes

1 Body SA 278 Class 40 SA 395 SA 216 WCB SA 351 CF 8

1.2 Seat ring AISI 420 --

2 Seat ring * AISI 420 AISI 316 TI

3 Plug * AISI 420 AISI 316 TI

4 Self-locking nut * AISI 316 TI

5 Stem * AISI 420 AISI 316 TI

6 Straight pin * AISI 302 AISI 321

7 Mounting bonnet SA 395 SA 216 WCB SA 351 CF 8

8 Guide bushing AISI 420 (hardened) AISI 316 TI

9 Gasket * CrNi laminated both sides with pure graphite

10 Studs AISI 1035 / 1038 AISI 316

11 Hexagon nuts AISI 1035 AISI 316

12 V-ring unit * PTFE

13 Packing ring * PTFE or pure graphite

14 Washer * SA 240 Gr. 304

15 Spring * AISI 302

16 Bushing * Reinforced PTFE

17 Sealing ring * Soft iron / Copper AISI 316 TI

18 Scraper * Reinforced PTFE

19 Screw joint* AISI 303

20.1 Bellows housing SA 395 SA 216 WCB SA 351 CF 8

20.2 Mounting bonnet SA 395 SA 216 WCB SA 351 CF 8

20.3 Stem- / Bellows unit * AISI 420 / SA 182 F 321 AISI 316 TI

20.4 Guide bushing AISI 420 (hardened) AISI 316 TI

20.5 Guide bushing AISI 420 (hardened) AISI 316 TI

20.6 Gasket * CrNi lam. both sides with pure graphite

20.7 Studs AISI 1035 / 1038 AISI 316

20.8 Hexagon nuts AISI 1035 AISI 316

20.10 Packing ring * Pure graphite

20.12 Washer * SA 240 Gr. 304

20.17 Screw joint * AISI 303

31 Plug * AISI 420 AISI 316 TI

32 Distance bushing * SA 240 Gr. 304

37 Stem adapter * AISI 420 AISI 316 TI

38 Stem adapter * AISI 420 AISI 316 TI

40 Plug * AISI 420 AISI 316 TI

41 Stem adapter * AISI 420 AISI 316 TI

42 Screw joint * AISI 303

* Spare parts

4)

/ 55.451

4)

up to Size 4“

4)

Please indicate when ordering:

1. Figure-No. 4. Body material 7. Stem sealing

2. Nominal diameter (DN) 5. Plug design 8. Actuator

3. Nominal pressure (PN) 6. Cv-value 9. Special version / accessories

Example:

Figure 35.450; size 4“; nominal press. PN 40 bar; body material cast steel; mixing construction;
Cv 185; stem sealing PTFE-V-ring unit; ARI-PREMIO 1124 lbf (5 kN).

Edition 10/04 - Data subject to alteration

Dimensions in inch (in)

1 in =^25.4 mm

Weights in pound (lb)

1 lb =^0.45 kg

Pressures in psig (gauge)

1 psi =^0.07 bar / 1 bar =^14.5 psi

Cv in US gal/min

Cv 1 =^Kvs 0.86

1 lbf =^4.45 N

1 ft lbf =^1.36 Nm

8

Technical data of the valve

Type: Control valve Fig. 450-451

STEVI® 450 / 451

Technical data / Pressure-temperature-ratings / Dimensions

Plug design: Parabolic plug / V-port plug

Size: Size 1/2“ - 6“

Nominal pressure: PN 16, PN 25, PN 40

Fig. 450

• PTFE-V-ring unit +14°F up to +428°F

• PTFE-packing +14°F up to +482°F

Stem sealing:

Body material:

Technical data for actuator refer to corresponding actuator data sheets.

Pressure-temperature-ratings acc. to DIN EN1092-1 / -2 Observe regulations

acc. to DIN EN 1092-2

Material PN

SA 278 Cl. 40 16 bar --- 232 psi 208 psi 185 psi 162 psi 139 psi --- --- ---

SA 395

• Pure graphite-packing +14°F up to +842°F

Fig. 451

• Stainless steel bellows seal

with safety stuffing box -76°F up to +842°F

Cast iron (to 4“) PN16 Fig. 12.450 / 12.451
Spheroidal graph. iron PN16 Fig. 22.450 / 22.451
Sph. graph. iron (to 4“) PN25 Fig. 23.450 / 23.451
Cast steel PN25 Fig. 34.450 / 34.451
Cast steel PN40 Fig. 35.450 / 35.451
Stainless steel (to 4“) PN40 Fig. 55.450 / 55.451

Other materials and executions on request

Temperature

-76°F up to <14°F*

16 bar on request 232 psi 225 psi 213 psi 201 psi 186 psi 162 psi --- ---

25 bar on request 362 psi 352 psi 333 psi 316 psi 290 psi 254 psi --- ---

14°F up to 248°F 302°F 392°F 482°F 572°F 662°F 752°F 842°F

Guiding: Stem and port guiding

Flow characteristic: linear

Rangeability: 30 : 1

Shut off classes:

Selection of possible
applications

:

Metal seat - Leakage class IV
acc. to ANSI / FCI 70-2

Fig. 450 Fig. 451

• Cooling water • Refrigerant

• Cooling brine • Cooling water

• Warm water • Warm water

• Hot water • Hot water

• Steam • Heat transfer oil

• Gas • Steam

- other applications on request -

• Gas

acc. to DIN EN 1092-1

Material PN

SA 216 WCB

SA 351 CF 8 M 40 bar 580 psi 580 psi 540 psi 490 psi 451 psi 425 psi 400 psi 387 psi 371 psi --

Intermediate values for max. permissible operational pressures can be determined by linear interpolation of the given
temperature / pressure chart.

* Valve with extended bonnet, studs and nuts made of AISI 316 required (at temperatures below -14°F)

Valve dimensions Face to face length FTF series 1 according to DIN EN 558-1 (DIN 3202-1 series F1)

Size 1/2“ 3/4“ 1“ 1 1/4“ 1 1/2“ 2“ 2 1/2“ 3“ 4“ 5“ 6“ 8“ 10“

L (in) 5.12 5.91 6.30 7.09 7.87 9.06 11.42 12.20 13.78 15.75 18.90 23.62 28.74

H2 (in) 2.56 2.76 2.95 3.15 3.54 3.94 4.72 5.12 5.91 7.87 8.27 14.96 17.32

Flange dimensions Flanges acc. to DIN EN 1092-1 (Flangeholes/-thickness tolerances acc. to DIN 2533 / 2544 / 2545)

Size 1/2“ 3/4“ 1“ 1 1/4“ 1 1/2“ 2“ 2 1/2“ 3“ 4“ 5“ 6“ 8“ 10“

PN 16 bar

PN 25 bar

PN 40 bar

25 bar 271 psi 362 psi 338 psi 314 psi 281 psi 258 psi 233 psi 217 psi 209 psi 201 psi

40 bar 435 psi 580 psi 541 psi 503 psi 438 psi 412 psi 374 psi 348 psi 335 psi 322 psi

∅ D (in) 3.74 4.13 4.53 5.51 5.91 6.50 7.28 7.87 8.66 9.84 11.22 13.39 15.94

∅ K (in) 2.56 2.95 3.35 3.94 4.33 4.92 5.71 6.30 7.09 8.27 9.45 11.61 13.98

n x ∅ d1 (in) 4x0.55 4x0.55 4x0.55 4x0.71 4x0.71 4x0.71 4x0.71 8x0.71 8x0.71 8x0.71 8x0.87 12x0.87 12x1.05

∅ D (in) 3.74 4.13 4.53 5.51 5.91 6.50 7.28 7.87 9.25 10.63 11.81 14.17 16.73

∅ K (in) 2.56 2.95 3.35 3.94 4.33 4.92 5.71 6.30 7.48 8.66 9.84 12.20 14.57

n x ∅ d1 (in) 4x0.55 4x0.55 4x0.55 4x0.71 4x0.71 4x0.71 8x0.71 8x0.71 8x0.87 8x1.02 8x1.02 12x1.02 12x1.18

∅ D (in) 3.74 4.13 4.53 5.51 5.91 6.50 7.28 7.87 9.25 10.63 11.81 14.76 17.72

∅ K (in) 2.56 2.95 3.35 3.94 4.33 4.92 5.71 6.30 7.48 8.66 9.84 12.60 15.16

n x ∅ d1 (in) 4x0.55 4x0.55 4x0.55 4x0.71 4x0.71 4x0.71 8x0.71 8x0.71 8x0.87 8x1.02 8x1.02 12x1.18 12x1.3

Temperature

-76°F up to <14°F*

14°F up to 122°F 212°F 302°F 392°F 482°F 572°F 662°F 752°F 842°F

9

Edition 05/05 - Data subject to alteration

Stem sealings

Operating mode

Design with mixing plug Size 1/2“ - 6“ Design with diverting plug Size 1 1/2“ - 6“

(Attention: reduced Cv-values)

STEVI® 450 / 451

Stem sealings / Operating mode

Bellows seal with safety stuffing boxSpring loaded PTFE-V-ring unit PTFE- / pure graphite-packing

ARI-Control valves are suitable for use with pneu-

matic or electric actuators.

According to the application two different variations

are possible (see drawings on the left)

Design with mixing plug as standard.

Select when the valve is used for mixing service (2

inlets, 1 outlet).

1/2“-11/4“ with mixing plug can also be used

Size

for diverting service (1 inlet, 2 outlets).

In exceptions the design with mixing plug can also
be used in diverting service for Size ≥ 1

small closing pressures are possible.

Design with diverting plug will be used

exclusively for diverting service.

1/2“. Only

10

Technology for the Future.

GERMAN QUALITY VALVES

Phone [phone] Fax [phone], Internet: http://www.ari-armaturen.com E-mail: [e-mail]

ARI-Armaturen, USA Inc., 9363 Winkler Drive, Suite A, Houston, Texas 77017, USA, ,

Edition 10/04 - Data subject to alteration