Water system hydrants are vital firefighting fixtures that provide fast, dependable access to pressurized water during fire emergencies. Installed in municipal areas, industrial facilities, commercial properties, and on-site private systems, hydrants serve as primary connection points for fire hoses and suppression equipment.
Hydrants are available in two main types:
Wet Barrel Hydrants – Commonly used in warm climates, these hydrants maintain water in the barrel and are equipped with outlet valves at each discharge port for quick access.
Dry Barrel Hydrants – Designed for cold or freezing environments, dry barrel hydrants isolate water below ground until activation, preventing internal freezing and allowing safe year-round operation.
Water flow to the hydrant is typically controlled by:
An OS&Y (Outside Screw and Yoke) valve, offering visible valve position and commonly used in accessible, above-ground valve applications
An NRS (Non-Rising Stem) valve, ideal for below-grade installations where valve status is indicated externally
Hydrants are available in a variety of sizes and configurations, including:
2.5" and 4.5" hose connections
Single- or multi-outlet designs
Flanged or threaded inlet connections
Above-ground or flush-mounted (underground) styles
Optional accessories and supporting features include:
Traffic break flanges – Designed to prevent damage to the main hydrant body in the event of vehicle impact
Indicator posts – Surface-mounted or buried vertical posts that visually show valve position (open or closed), often used with buried NRS valves
T-keys (hydrant wrenches) – Used for operating hydrant caps and valves; compatible with standardized operating nuts
Protective caps and tamper-resistant fittings
Drain valves or self-draining features in dry hydrants to prevent freeze damage
Constructed from durable, corrosion-resistant materials such as ductile iron, bronze, or composite alloys, hydrants are engineered to withstand high water pressures, harsh climates, and mechanical wear. All designs adhere to NFPA, AWWA, EN, and local fire code standards, ensuring compatibility with municipal or private water supply infrastructure.
Together with proper valve control, accessory components, and regular inspection, hydrants form an essential part of a reliable fire protection network, ensuring life safety and asset protection in both public and private environments.