![]() ![]() The water held back by the bulb then escapes and flows toward the deflector, which disperses it throughout the room.įusible link fire sprinklers replace that bulb with metal components secured to the sprinkler by a heat-sensitive alloy. ![]() Once the air around the sprinkler reaches a certain temperature - often 155F or 200F (68C or 93C) - the liquid expands, which causes the glass to break. When a sprinkler head has a glass bulb, that bulb typically contains a glycerin-based liquid. Nearly all fire sprinklers are composed of the same components: a sealing assembly or ‘plug’ that prevents water from escaping, a heat-sensitive element that breaks or melts at a given temperature to allow water flow, a deflector that distributes the water effectively, and a frame that holds all these parts.įire sprinkler heads feature heat-sensitive parts - either a glass bulb or a fusible link – that cause them to activate at a specific temperature.
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