General information Product limitations
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Local regulations may restrict the use of this product to below the conditions quoted. In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2016
TI-S24-41 CH Issue 3
Pressure / Temperature Limits for Control Valves
Control valve Technical Information sheets (TIs) for products in pressurised systems contain a 'Pressure / temperature limits' diagram. This diagram indicates the envelope of the product(s) at the full range of pressures and temperatures. The construction of the 'Pressure / temperature limits' diagram is shown below. Note: A table 'Definition of technical terms used for control valves' and a typical example (no specific product) is displayed overleaf.
A Is the maximum design temperature the body of the product can be raised to permanently, at a given pressure.
A
Note: This line will illustrate the minimum operating temperature not the minimum design temperature.
Pressure bar g
B Is the maximum design pressure that the combined body and end connections of the product can withstand at a given temperature. It is a function of the PN rating and body design / material.
B
7.4 5
Pressure bar g
C Is a prohibited area and the product must not be used in this region and will be worded: The product must not be used in this region.
C
Pressure bar g
D The steam saturation curve is added (where relevant) to enable users to easily find the specific operating points, e.g. 10 bar g saturated steam @ 185 °C, 10 bar g steam with 20 °C superheat or 10 bar g / 250 °C steam.
11.4.6
D
Pressure bar g
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