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Structure Improvement of Preaction Valve to Reduce the Pressure Drop
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 Title & Authors
Structure Improvement of Preaction Valve to Reduce the Pressure Drop
Hong, Seung-Tae; Jeong, Jae-Han; Nam, Jun-Seok; Kwon, Young-Kyu; Han, Chul-Su; Yoo, Seung-Joon;
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The body structure of diaphragm type preaction valve was improved in order to reduce the pressure drop. The pressure drop must be kept within 20.7 kPa to pass the revised (2012. 2. 9) standard for alarm valve and preaction valve. The pressure drop test was carried out by KFI (Korea Fire Institute) standard. The pressure drop of a preaction valve was higher than that of an alarm valve. Causes for increasing the pressure drop were investigated with the fluid flow in the valve. The preaction valve had more pressure drop factors (changes in velocity and direction) compared with the alarm valve. Inner structure of the preaction valve was changed to the clapper type to remove the pressure drop factors. In 80A and 100A size of preaction valves, the pressure drop was reduced from 80.9 and 171.0 kPa to 14.4 and 14.2 kPa respectively, after the change of the structure.
Preaction Valve;Alarm Valve;Pressure Drop;Standard;
 Cited by
National Fire Safety Code 103, National Emergency Management Agency, Notification No 2012-89.

Standard for Alarm Valve and Preaction Valve, National Emergency Management Agency, Notification No 2012-69.

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