. Grinnell variable pressure alarm valve. FIGURE 2 20754 i^STlTOT£ Oi IBOHNOIiOO :■. AHMirTH institute: of■ TKE GRINMELL VARI.^JBLE PRi;:3SURS ALARI.: V^J^VE. - To determine the efficiency, the retarding factor, thereliability, conditi-ns modifj^ing these factors said the properinstallation of a Grinnell Variable Pressure Alarm Valve, r/hereefficiency is here defined as the ability or po\7er of thevalve to produce the effect intended, ^^here the retarding factoris defined as the tine elapsin;;^ betr/een the first movement ofv/ater past the valve due to the opening of a sjst

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. Grinnell variable pressure alarm valve. FIGURE 2 20754 i^STlTOT£ Oi IBOHNOIiOO :■. AHMirTH institute: of■ TKE GRINMELL VARI.^JBLE PRi;:3SURS ALARI.: V^J^VE. - To determine the efficiency, the retarding factor, thereliability, conditi-ns modifj^ing these factors said the properinstallation of a Grinnell Variable Pressure Alarm Valve, r/hereefficiency is here defined as the ability or po\7er of thevalve to produce the effect intended, ^^here the retarding factoris defined as the tine elapsin;;^ betr/een the first movement ofv/ater past the valve due to the opening of a sjstem outlet andthe completion of the a,ct by v/hich the : actuates the alrrmdevices ;-aid v/here reliability is xinderstood to mean the amountof. to e placed upon the to produce the effectintended :^rLd nothing Grinnell Variable P^ressure Alarm of the s-Ting chec::type; . ischar~e measuring device, including calibrated sprinilsrheads fs shor/n in Figure 5; Lea: isrsuring device as inFigure 3: Pumps: Air-compressor: Otand-oipe

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