Fire Valve Types Explained: Gate, Butterfly, Check, Alarm & Deluge Valves

1. Fire Gate Valve

Function

Gate valves provide full-flow shutoff in fire protection piping. The wedge-shaped gate moves perpendicular to flow, creating minimal pressure drop when fully open.

Key Specifications

Parameter	Typical Range
Size	2" to 12" (DN50 to DN300)
Pressure rating	175 PSI (12 bar) to 300 PSI (20.7 bar)
Material	Ductile iron body, bronze/brass trim
Connection	Flanged, grooved, or threaded
Standard	UL 262, FM 1120

Applications

Main system control valves - isolating building sprinkler systems from municipal water supplies

Pump discharge and suction lines

Tank outlet connections

Installation Best Practice

🔧 Tip: Gate valves in fire protection systems should be supervised (equipped with tamper switches) to ensure they remain in the open position. A closed gate valve is a leading cause of sprinkler system failure.

CA-FIRE Product: OS&Y Gate Valve

Our Outside Screw and Yoke (OS&Y) gate valves feature visible stem position indication, making it easy to verify the valve is fully open. Available with FM, UL, and CCCF certifications.

2. Fire Butterfly Valve

Function

Butterfly valves use a rotating disc to control flow. They are lighter and more compact than gate valves, making them ideal for large-diameter piping where space is limited.

Types of Fire Butterfly Valves

Type	Feature	Application
Wafer type	Fits between flanges, no lug bolts	Light-duty, temporary installations
Lug type	Threaded lugs for bolt-through mounting	Permanent installations, higher pressure
Grooved end	Victaulic-style coupling connection	Fast installation in commercial buildings

Signal Butterfly Valves

Signal butterfly valves include a supervisory switch that transmits the valve position to the fire alarm control panel. This is required by NFPA 13 for all control valves in sprinkler systems.

CA-FIRE Product: Fire Signal Butterfly Valve

Our fire signal butterfly valves feature:

Visual position indicator (open/closed)

Tamper-proof switch (SPDT, 10A @ 125/250V AC)

Grooved or flanged connections

Pressure rating: 175 PSI (12 bar) standard, 300 PSI optional

3. Fire Check Valve (Non-Return Valve)

Function

Check valves allow water to flow in one direction only, preventing backflow and maintaining system pressure. They are critical for:

Preventing drainage of elevated piping

Protecting fire pumps from backspin

Maintaining priming in fire pump suction lines

Types of Fire Check Valves

Type	Mechanism	Best For
Swing check	Hinged disc swings open with flow	Horizontal piping, low-velocity systems
Silent check	Spring-loaded disc	Vertical piping, high-velocity systems
Rubber-flap check	Flexible elastomer flap	Corrosive water conditions

Installation Note

Check valves must be installed with the flow arrow pointing in the correct direction. In vertical installations, spring-loaded (silent) check valves are required to ensure reliable closure.

CA-FIRE Product: Fire Check Valve

Available in ductile iron and stainless steel construction, with FM/UL approval for pressures up to 300 PSI.

4. Alarm Check Valve

Function

The alarm check valve is the heart of a wet pipe sprinkler system. It:

Allows water to flow to sprinklers when the system activates

Prevents backflow into the water supply

Triggers water motor gongs and pressure switches for alarm notification

How It Works

In standby, water pressure holds the clapper closed against the system side

When a sprinkler opens, pressure drops on the system side

The clapper opens, allowing water flow

Water flows through the alarm line to activate alarms

Key Components

Component	Function
Clapper assembly	Main sealing element, rubber-faced
Alarm line trim	Includes retard chamber, pressure switch, water motor gong
Bypass check valve	Allows pressure equalization during normal fluctuations
External bypass	Prevents false alarms from pressure surges

CA-FIRE Product: Wet Alarm Check Valve

Our wet alarm check valves are available in sizes from 2" to 8" (DN50 to DN200), with:

Retard chamber to prevent false alarms from water hammer

Trim package including pressure switch and water motor gong

FM, UL, and CCCF certifications

5. Deluge Valve

Function

Deluge valves are solenoid or pneumatically actuated control valves that release water to open sprinkler heads in deluge systems. Unlike alarm check valves, deluge valves are normally closed and require an external signal to open.

Actuation Methods

Method	Trigger	Response Time	Best For
Pneumatic	Air pressure drop from broken pilot line	Fast	Explosion-risk areas
Electric solenoid	Fire alarm panel signal	Fast	Standard industrial applications
Manual release	Human operator	Immediate	Emergency override
Hydraulic	Water pressure from pilot sprinkler	Medium	Specialized applications

System Requirements

Deluge valves require:

Detection system (flame detectors, heat detectors, or pilot sprinklers)

High-capacity water supply (often dedicated fire pump)

Foam concentrate injection (for Class B flammable liquid hazards)

CA-FIRE Product: Deluge Valve

Our deluge valves feature:

Multiple actuation options (pneumatic, electric, manual)

Reset capability without draining the system

Pressure rating: 300 PSI (20.7 bar)

Sizes: 2" to 8" (DN50 to DN200)

Fire Valve Selection Guide

Use this table to match valve type to system requirements:

Application	Recommended Valve	Why
Main system isolation	OS&Y Gate Valve	Full flow, positive shutoff, visible position
Large-diameter control (4"+)	Butterfly Valve	Compact, lightweight, cost-effective
System supervision required	Signal Butterfly Valve	Built-in tamper switch
Backflow prevention	Check Valve	One-way flow, protects pumps
Wet pipe sprinkler system	Alarm Check Valve	Alarm activation, backflow prevention
Deluge/foam system	Deluge Valve	External actuation, rapid flooding