Boiler house Level controls
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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 2022
TI-S75-12 CTLS Issue 5
Selection of Modulating Feedwater Valves Pneumatically Actuated
Safety Your attention is drawn to Safety Information Leaflet IM-GCM-10
2.3 95
1. Selection of the valve body size The standard valve for modulating boiler water level control is DN40 (1½") nominal pipe size (40 mm). A range of seat sizes to suit this body is available to suit most sizes of boilers. However, for smaller or larger boilers, alternative sized valves can be selected from the Spirax Sarco range - See page 3. Valve stem seals are available in normal (PTFE) or high temperature (graphite) material. We recommend the use of the high temperature seal to decrease the possibility of leakage over long term use. Valves with high temperature stem seals are suffixed 'H'.
2. Selection of the valve body material and pressure rating The valve body must be suitable for the maximum pressure and temperature in the feedwater line. Standard valve types are as follows:
KE71 Screwed
SG iron body
PN25 rating (Pmax 25 bar g at 120 ºC)
KE73 Flanged
KE43 Flanged PN40 rating (Pmax 40 bar g at 120 ºC)
Cast steel body
To select the valve, please go to page 2
TI-S75-12 CTLS Issue 5
Page 1 of 4
Selection of Modulating Feedwater Valves Pneumatically Actuated
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