Quick sizing chart for control valves

From Honeywell

Cv

Steam capacity, lb/hr

Water capacity, gal/min

Vacuum return systems

Atmospheric return systems

Differential pressure, psig

2-psi supply pressure

5-psi supply pressure

10-psi supply pressure

2-psi supply pressure

2-psi supply pressure

2-psi supply pressure

3.2-psi pressure drop

5.6-psi pressure drop

9.6-psi pressure drop

1.6-psi pressure drop

4.0-psi pressure drop

8.0-psi pressure drop

2

4

6

8

10

15

20

0.33

7.7

11.0

16.0

5.4

9.3

14.6

0.41

0.66

0.81

0.93

1.04

1.27

1.47

0.63

14.6

20.9

30.5

10.4

17.7

27.8

0.89

1.26

1.54

1.78

1.99

2.40

2.81

0.73

17.0

24.3

35.4

12.0

20.5

32.2

1.00

1.46

1.78

2.06

2.30

2.80

3.25

1

23.0

33.2

48.5

16.4

28.0

44.0

1.40

2.0

2.44

2.82

3.16

3.90

4.46

1.6

37.1

53.1

77.6

26.8

45.0

70.6

2.25

3.2

3.90

4.51

5.06

6.20

7.13

2.5

58.25

82.9

121.2

41.9

70.25

110.25

3.53

5.0

6.10

7.05

7.90

9.68

11.15

3

69.9

99.5

145.5

50.2

84.3

132.3

4.23

6.0

7.32

8.46

9.48

11.61

13.38

4

93.2

132.2

194.0

67.0

112.4

177.4

5.60

8.0

9.76

11.28

12.60

15.50

17.87

5

116.2

165.2

242.5

82.7

140.5

220.5

7.10

10.0

12.2

14.1

15.8

19.4

22.3

6

139

200

291

99

168

265

8.5

12.0

14.6

16.9

18.9

23.2

27.0

6.3

146

209

311.5

104

177

278

8.9

12.6

15.4

17.8

19.9

24.4

28.1

7

162

233

339.5

115

196

309

9.9

14.0

17.1

19.7

22.1

27.1

31.0

8

186.5

264.4

388

131.2

224.8

352.8

11.3

16.0

19.5

22.6

25.3

31.6

35.7

10

232

332

485

164

281

441

14.1

20

24.4

28.2

31.6

38.7

44.6

11

256

366

533.5

181

309

486

15.5

22

27.0

31.0

34.4

42.5

49.0

13

303

434

630.5

213.7

365.3

373.3

18.3

27

31.7

36.7

41.1

50.3

58.0

14

326

465

679

232

393

617

19.7

28

34.0

39.0

44.0

54.0

62.0

15

349.3

497.6

727.5

246

421.5

661.5

21.1

30

36.6

42.3

47.4

58.0

66.9

16

370.9

531

776

268

450

706

22.5

32

39

45.1

50.6

62

71.3

18

419

597

873

301

505

794

25

36

44

51

57

70

80

Cv

Steam capacity, lb/hr

Water capacity, gal/min

Vacuum return systems

Atmospheric return systems

Differential pressure, psig

2-psi supply pressure

5-psi supply pressure

10-psi supply pressure

2-psi supply pressure

2-psi supply pressure

2-psi supply pressure

3.2-psi pressure drop

5.6-psi pressure drop

9.6-psi pressure drop

1.6-psi pressure drop

4.0-psi pressure drop

8.0-psi pressure drop

2

4

6

8

10

15

20

20

466

664

970

335

562

882

28

40

49

56

63

77

89

23

541

763

1,115

385

646

1,014

32

46

56

65

73

89

103

25

582.5

829

1,212

419

702.5

1,102.5

35.3

50

61

70.5

79

96.8

111.5

27

628.2

896

1,309

452.5

758.7

1,190.7

38.1

54

65.9

76.1

85.3

104.5

120.4

30

699

995

1,455

502

843

1,323

42.3

60

73.2

84.6

94.8

116.1

133.8

38

885

1,257

1,833

636

1,069

1,676

53

76

93

107

120

147

169

40

932

1,322

1,940

670

1,124

1,764

56

80

97.6

112.8

126

155

178.7

50.0

1,162

1,652

2,425

827

1,405

2,205

71

100

122

141

158

194

223

56.0

1,305

1,851

2,716

938

1,574

2,469

79

112

137

158

177

217

250

63.0

1,460

2,090

3,056

1,043

1,770

2,778

89

126

154

178

199

244

281

75.0

1,748

2,481

3,637

1,230

2,107

3,307

106

150

183

212

237

290

335

80.0

1,865

2,644

3,880

1,312

2,248

3,528

113

160

195

225.6

253

316

357

90.0

2,096

2,980

4,365

1,476

2,529

3,969

127

180

220

254

284

348

401

97.0

2,229

3,204

4,703

1,590

2,725

4,277

137

196

231

274

307

375

432

100.0

2,330

3,319

4,850

1,640

2,816

4,410

141

200

244

282

316

387

446

105.0

2,442

3,481

5,092

1,722

2,950

4,630

148

210

256

296

332

406

468

130.0

3,030

4,340

6,305

2,137

3,653

5,733

183

270

317

367

411

503

580

150.0

3,493

4,976

7,275

2,460

4,215

6,615

211

300

366

423

474

580

699

160.0

3,709

5,310

7,760

2,680

4,500

7,060

225

320

390

451

506

620

713

170.0

3,960

5,642

8,245

2,788

4,777

7,497

240

340

415

479

537

658

758

Cv

Steam capacity, lb/hr

Water capacity, gal/min

Vacuum return systems

Atmospheric return systems

Differential pressure, psig

2-psi supply pressure

5-psi supply pressure

10-psi supply pressure

2-psi supply pressure

2-psi supply pressure

2-psi supply pressure

3.2-psi pressure drop

5.6-psi pressure drop

9.6-psi pressure drop

1.6-psi pressure drop

4.0-psi pressure drop

8.0-psi pressure drop

2

4

6

8

10

15

20

190.0

4,450

6,310

9,215

3,116

5,339

8,379

268

360

464

536

600

735

847

244.0

5,670

7,930

11,834

4,001

6,856

10,760

344

488

595

688

771

944

1,088

250.0

5,825

8,290

12,125

4,190

7,025

11,025

353

500

610

705

790

968

1,115

270.0

6,282

8,960

13,095

4,525

7,587

11,907

381

540

659

761

853

1,045

1,204

300.0

6,990

9,950

14,550

5,025

8,430

13,230

423

600

732

846

948

1,161

1,338

350.0

8,160

11,590

16,975

5,860

9,835

15,435

494

700

854

987

1,106

1,355

1,561

360.0

8,380

11,910

17,460

6,030

10,116

15,876

508

720

878

1,015

1,137

1,393

1,606

430.0

10,010

14,225

20,855

7,200

12,083

18,963

606

860

1,049

1,213

1,359

1,664

1,918

480.0

11,180

15,860

23,280

8,045

13,408

21,168

677

960

1,171

1,353

1,517

1,858

2,141

640.0

14,910

21,180

31,040

10,496

17,984

28,224

902

1,280

1,561

1,805

2,022

2,477

2,854

760.0

17,700

25,120

36,860

12,464

21,356

33,516

1,071

1,520

1,854

2,143

2,401

2,941

3,390

1,000.0

23,300

33,190

48,500

16,400

28,160

44,100

1,410

2,000

2,440

2,820

3,160

3,870

4,460

1,200.0

27,150

39,790

58,200

19,680

33,720

52,920

1,692

2,400

2,928

3,384

3,792

4,644

5,352

1,440.0

33,290

47,160

69,840

23,616

40,464

63,504

2,030

2,880

3,514

4,061

4,550

5,573

6,422