🧰 SAMEKTRA SERVICES →
HOMETRAINING

Sprinkler System Lab

Take the parts apart, name them, and watch the water.

Dry pipe valve and trim · soonControl valves: OS&Y, butterfly, PIV · soonBackflow preventers · soonFire department connection · soonFire pump room · soon

Sprinkler heads: pendent bulb and upright link

The two heat-responsive designs you will meet most: a glass bulb that breaks, and a solder link that melts. Same job, different parts.

CEILINGCEILING / ROOF DECKPENDENT · GLASS BULBUPRIGHT · FUSIBLE LINKFrame (arms)Frame (arms)Threads and orificeThreads and orificeEscutcheonGlass bulbDeflectorLevers (strut)DeflectorCap (button)Compression screwCap (button)Fusible link
Water A little water Empty pipe Hot gasTypical arrangement — trim and parts vary by manufacturer.

Click or tap any part in the drawing, or pick one from the list, to pull it out and read about it.

PARTS IN THIS ASSEMBLY
Pairs with the NICET Level I Water-Based course and the practice exam. Frequencies are from NFPA 25 (2023 edition); check the edition your AHJ enforces. Drawings are generic schematics, not to scale.
Sprinkler System Lab — Take the Parts Apart | LifeSafetyWiki