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MV & LV SERIES ENGINEERED DRY CHEMICAL FIRE EXTINGUISHING SYSTEM
OPERATION, DESIGN, & SERVICE MANUAL
REV C
Document # DOC324
Issued: April 26, 2018
Revised: March 22, 2022
UL FILE # EX27541
2.6.3 NozzleBlow-OCaps
See P/N Below
All Fixed Orifice nozzles ship with a blow-off cap, but the blow-off cap for the JSH-360 and JSH-180
nozzles must be ordered separately. e blow-off cap must remain in place when the nozzle is installed to
prevent the entrance of moisture, contaminants, or other foreign materials into the piping. During a system
discharge, the pressure from the agent discharging out of the nozzle orifices will blow the cap off the nozzle.
Caps should be replaced when they become worn, damaged, brittle, or lost.
e LAOH, TS, TF, ree-Way, D/P and SCR Nozzles use the P/N 14988 replacement cap.
e TFP Nozzle uses the P/N 17810 replacement cap.
Table2.6.3-JSHDischargeNozzleBlow-OCaps
Nozzle Part Number
Nominal
Pipe
Size
Blow-OCap
Part Number
Brass Stainless Steel
360° 180° 360° 180°
19529 19522 20445 20438 3/8 in (10mm) 97146
19530 19523 20446 20439 1/2 in (15 mm) 97145
19531 19524 20447 20440 3/4 in (20 mm) 97144
19532 19525 20448 20441 1 in (25 mm) 97143
19533 19526 20449 20442 1 1/4 in (32 mm) 97142
19534 19527 20450 20443 1 1/2 in (40 mm) 97141
19535 19528 20451 20444 2 in (50 mm) 97140
Section 2 System Components and Description
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