General information

Product limitations

Typical 'Pressure / temperature limits' diagram and table for a safety valve:

Pressure / temperature limits

Please contact: Spirax Sarco, when so required, for relevant details regarding the maximum allowable limits that the body can withstand.

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A - B

A - C

A

Steam

saturation

curve

C

B

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Pressure bar g

The product must not be used in this region.

Flanged PN25.

Flanged ANSI 150.

Note: For hygienic / sanitary clamp ends the maximum

pressure / temperature may be restricted by the gasket or

sanitary clamp used. Please consult Spirax Sarco.

Body design conditions

PN25

18 bar g

14 bar g

0.3 bar g

-90 °C

+300 °C

-30 °C

+120 °C

-50 °C

+150 °C

-20 °C

+200 °C

5%

10%

10%

0.71

Maximum

Minimum

Metal seat

Nitrile seat

Temperature

EPDM seat

Viton seat

Overpressure

Blowdown limits

Derated

coefficient of

discharge values

DN15 - DN32

DN40 - DN50

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

Steam

Gas, liquid

Steam, gas, liquid

Steam, gas

Set pressure

range

Performance

data

Liquid

0.52

For further

'Pressure / temperature limits' diagram and table layouts,

see TI-S24-41, pages 4 and 5.

Designed for a maximum inlet cold hydraulic test pressure of 37.5 bar g

Note: If a test gag is fitted, test pressure must not exceed 25 bar g

11.4.12

TI-S13-50 CH Issue 3

Pressure / Temperature Limits for Safety Valves

T

e

m

p

e

r

a

t

u

r

e

°

C