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http://dx.doi.org/10.9713/kcer.2015.53.1.16

Structure Improvement of Preaction Valve to Reduce the Pressure Drop  

Hong, Seung-Tae (R&D Laboratory, Korea Fire Institute)
Jeong, Jae-Han (R&D Laboratory, Korea Fire Institute)
Nam, Jun-Seok (R&D Laboratory, Korea Fire Institute)
Kwon, Young-Kyu (Woodang Technical Industry Co. Ltd.)
Han, Chul-Su (Woodang Technical Industry Co. Ltd.)
Yoo, Seung-Joon (Department of Environmental and Chemical Engineering, Seonam University)
Publication Information
Korean Chemical Engineering Research / v.53, no.1, 2015 , pp. 16-21 More about this Journal
Abstract
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.
Keywords
Preaction Valve; Alarm Valve; Pressure Drop; Standard;
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  • Reference
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