23 Fire Sprinkler Parts You Should Get To Know

You’ve just had your building’s fire sprinkler system inspected. You then receive a report from your fire sprinkler company listing the deficiencies found and the repairs needed to keep your building up to code. The problem? You have no idea what any of these parts are, or their role in the fire sprinkler system.

Good news. In this post, we’re going to discuss the 23 most common components of your fire sprinkler system. So whether you’re a building owner or property manager trying to understand the work that needs to be done on your system, or you’re just starting out in the fire sprinkler industry, we’ve got you covered. Let’s begin.

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Alarm Valve: The alarm valve controls the flow of water into the fire sprinkler system. When a fire sprinkler is activated due to a fire, the alarm valve will open, water will flow through the system, and an alarm will sound.

Butterfly Valve: An outside indicating valve used to regulate flow in a system.

Check Valve: A valve that allows flow in only one direction to prevent backflow.

Concealed Sprinkler Head: A recessed sprinkler with a cover plate. The cover plate drops away when exposed to a certain amount of heat.

Control Valve: The valve controls the water to the sprinkler system. The control valve should always be in the open position, however the valves are sometimes closed for system repairs and maintenance.Standpipe and Sprinkler Control Valve

Fire Department Caps: The caps located on the fire department connection used to prevent items from being placed inside that can block the flow of water.FDC Cap

Fire Department Connection: The connection used by the Fire Department to pump water into the sprinkler system or standpipe to supplement the existing water supply. Also known as a siamese connection.

Standpipe Fire Department Connection

Fire Pump: The fire pump is used when the water supply can’t provide enough pressure to meet the hydraulic design requirements of the system. The pump uses water from the water supply to increase water flow and pressure.

Fire Pump Installation

Fire Sprinkler Head: A fusible link or glass bulb in the sprinkler head melts when the heat of the fire reaches a set temperature. There are a number of different types of sprinkler heads such as Flush, Pendent, Recessed, Sidewall, Upright, Fast Response, Extended Coverage, Open Sprinklers, and Quick Response. The type of head used is determined by the hazard

.Fire Sprinkler Head

Gauge: A gauge measures water or air pressure in a system. According to NFPA25, the gauge must be replaced every five years.

Capitol Fire Gauge

Hangers: Hangers are attached to building structure and are used to support fire protection piping.

Inspectors Test: An alarm test device that verifies the water flow alarm is in proper working condition.

Jockey Pump: A small pump connected to the sprinkler system used in conjunction with a fire pump to maintain system pressure.

Main Drain: The primary drain connection located on the riser and also used as a flow test connection.

OS&Y Gate Valve: Used to control water flow to the system. When the gate rises, the water flows through a valve. When the gate is lowered, the gate will stop the water from flowing into the valve.

Pendant Fire Sprinkler: A sprinkler designed to be installed so that the water stream is directed downward against the deflector.

Post Indicator Valve (PIV): A vale that controls the water that is flowing into a building in the event of a fire. It also provides a visual indication if a gate vale is open or closed.

Retard Chamber: A device used to reduce the possibility of false alarms due to changes in the water supply pressure (i.e. water surges).

Spare Head Box: A small box hanging on the wall near the sprinkler riser. The box contains a set of spare sprinkler heads and a sprinkler head wrench.

Sprinkler Head Wrench: A special wrench designed to change sprinkler heads. There are different wrenches for different types of heads.

Tamper Switch: A switch that detects when a sprinkler valve has been partially or fully closed. The switch provides a supervisory alarm signal to the fire alarm system when closed.

Upright Fire Sprinkler: A sprinkler designed to be installed so that the water spray is directed upwards against the deflector.

Water Motor Gong: A bell that sounds when water flows through the sprinkler system. The gong is a mechanical water-driven alarm device typically installed on the outside wall of the sprinkler riser room.

Fire Sprinkler Alarm

If there’s a fire sprinkler part we missed or a component that you want to know more about, let us know in the comments below!