Solenoid Valves

Solenoid Valves for Steam and Hot Water Applications.

Solenoid valves for steam and hot water applications have been designed to cope with the severe temperature and aggressive nature of steam up to 185ºC or even 200ºC and beyond, making them ideal for steam injection systems, flat irons, and dryers, laundries, steam boiler control and blow down, steam sterilising systems and autoclaves. Steam rated and hot water rated solenoid valves are available in Brass, Bronze and Stainless Steel. 

Steam and hot water solenoid valve seals.

Steam rated solenoid valves should be fitted with PTFE seals and high temperature solenoid valve coils to resist the aggressive nature of steam and can typically withstand temperatures up to 200° centigrade.

Some hot water solenoid valves are fitted with EPDM seals that can be used for even low-pressure steam to 4.5 bar or 150º Centigrade, as this is usually a cheaper option. However in our view even though we can supply this option is is better to use a PTFE seal for a hot application to provide a long and trouble free life.

Steam systems will, even when regulated at some point see increases and temperature which will damage EPDM, so the initial cost saving is lost in down time and maintenance.

Direct Acting and Servo/ Pressure Assisted steam solenoid valves.

There are two main types of steam solenoid valve, direct acting and servo or pressure assisted. A direct acting steam solenoid valve works from zero pressure and does not reply on any pressure differential to work. The solenoid does all the work with the additional benefit that all the steam or hot water will be released leaving no back pressure if open ended.

As servo or pressure assisted steam solenoid valve utilises the system pressure to lift the piston or seal, these are typically more cost effective but do require a pressure differential to open and close. i.e. a higher inlet pressure to outlet pressure typically 0.2 to 0.5 bar.

Steam Pressure in Relation to Temperature. 

The temperature of steam in basic terms typically relates directly to its pressure. For example at normal atmospheric pressure i.e. 1bar absolute or 0 bar gauge water turns to steam at 99.6°C, however the more pressure that is applied the higher the steam temperature will be, for example at 10 bar gauge pressure steam will be at 184.1 degrees centigrade. This is why most steam solenoid valves are rated to 10 bar as they can withstand a steam media temperature up to 185°C. However some steam solenoid valves are designed to work at 12 bar steam which you can see in the below steam pressure to steam temperature conversion table equates to 191.6°C.

Pressure
Overpressure Absolute press.

Temperature
saturated
steam ts
°C

Thermal capacity

water
h’
kJ/kg

Vaporization
heat
r
kJ/kg

Thermal 

capacity

steam
h”
kJ/kg

Steam volume
"
m3/kg

Steam density
"
kg/m3

Pe
bar

p
bar

The over-
pressure
relates to
an absolute
atmospheric
ambient)
pressure of
1.000 bar.

0,01

7,0

29,34

2485

2514

129,2

0,0077

0,05

32,9

137,8

2424

2562

28,19

0,0355

0,1

45,8

191,8

2393

2585

14,67

0,0681

0,2

60,1

251,5

2358

2610

7,650

0,1307

0,3

69,1

289,3

2336

2625

5,229

0,1912

0,4

75,9

317,7

2319

2637

3,993

0,2504

0,5

81,3

340,6

2305

2646

3,240

0,3086

0,6

86,0

359,9

2294

2654

2,732

0,3661

0,7

90,0

376,8

2283

2660

2,365

0,4229

0,8

93,5

391,7

2274

2666

2,087

0,4792

0,9

96,7

405,2

2266

2671

1,869

0,5350

0

1,0

99,6

417

2258

2675

1,694

0,5904

0,1

1,1

102,3

429

2251

2680

1,549

0,6455

0,2

1,2

104,8

439

2244

2683

1,428

0,7002

0,3

1,3

107,1

449

2238

2687

1,325

0,7547

0,4

1,4

109,3

458

2232

2690

1,236

0,8088

0,5

1,5

111,4

467

2226

2693

1,159

0,8628

0,6

1,6

113,3

475

2221

2696

1,091

0,9165

0,7

1,7

115,2

483

2216

2699

1,031

0,9700

0,8

1,8

116,9

491

2211

2702

0,977

1,023

0,9

1,9

118,6

498

2206

2704

0,929

1,076

1,0

2,0

120,2

505

2201

2706

0,885

1,129

1,5

2,5

127,4

535

2181

2716

0,718

1,392

2,0

3,0

133,5

561

2163

2724

0,606

1,651

2,5

3,5

138,9

584

2147

2731

0,524

1,908

3,0

4,0

143,6

605

2133

2738

0,462

2,163

3,5

4,5

147,9

623

2120

2743

0,414

2,417

4,0

5,0

151,8

640

2107

2747

0,375

2,669

4,5

5,5

155,5

656

2096

2752

0,343

2,920

5,0

6,0

158,8

670

2085

2755

0,316

3,170

6

7

165,0

697

2065

2762

0,2727

3,667

7

8

170,4

721

2046

2767

0,2403

4,162

8

9

175,4

743

2029

2772

0,2148

4,655

9

10

179,9

763

2013

2776

0,1943

5,147

10

11

184,1

781

1999

2780

0,1774

5,637

11

12

188,0

798

1984

2782

0,1632

6,127

12

13

191,6

815

1971

2786

0,1511

6,617

13

14

195,0

830

1958

2788

0,1407

7,106

14

15

198,3

845

1945

2790

0,1317

7,596

15

16

201,4

859

1933

2792

0,1237

8,085

16

17

204,3

872

1921

2793

0,1166

8,575

17

18

207,1

885

1910

2795

0,1103

9,065

18

19

209,8

897

1899

2796

0,1047

9,555

19

20

212,4

909

1888

2797

0,0995

10,05

20

21

214,9

920

1878

2798

0,0949

10,54

24

25

223,9

962

1839

2801

0,0799

12,51

25

26

226,0

972

1829

2801

0,0769

13,01

29

30

233,8

1008

1794

2802

0,0666

15,01

30

31

235,7

1017

1785

2802

0,0645

15,51

39

40

250,3

1087

1713

2800

0,0498

20,10

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