Control valves

Safety valves

Sizing

For the majority of applications, the valve capacity can be selected from the flow capacity table below, alternatively it can be sized using the

online safety valve sizing and selection software at http://www.spiraxsarco.com/prs/product-sizing.asp

Flow capacity (in accordance with EN ISO 4126)

Saturated steam and air with 10% overpressure

Set pressure

Dry saturated steam

Air (0°C @ 1013 mbar)

bar g

kg/h

Nm3/h

1.0

42

61

1.5

53

75

2.0

63

88

2.5

74

103

3.0

84

119

3.5

95

134

4.0

105

149

4.5

115

164

5.0

126

179

5.5

136

194

6.0

146

209

6.5

156

224

7.0

167

239

7.5

177

255

8.0

187

270

8.5

197

285

9.0

208

300

9.5

218

315

10.0

228

330

Safety information, installation and maintenance

For full details see the Installation and Maintenance Instructions (IM-P257-02) supplied with the product.

Installation note: The SV405 and SV406 should always be installed with the centre line of the spring housing vertically above the valve.

How to order

Example: 1 off Spirax Sarco SV405 safety valve having 3⁄4" BSP inlet x 3⁄4" BSP outlet connections, with a set pressure of 5 bar.

TI-P257-01 CH Issue 8

SV405, SV405X and SV406 Safety Valves

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