Multi-Zone Inert Gas Suppression System

What Is It?

A Multi-Zone system (an SV22-type architecture) is an inert gas suppression design that feeds multiple fire-separated zones from a single shared cylinder bank. Instead of each zone having its own dedicated cylinder bank, all zones connect to a common gas source, and the component that determines which zone actually receives the gas is a selector valve installed specifically for that zone. When fire is detected in one zone, only that zone’s selector valve opens automatically, and the entire gas capacity of the shared cylinder bank is directed exclusively to that zone.

The core engineering assumption behind this architecture is that a fire is expected in only one zone at a time; the system is not designed for two or more zones to discharge simultaneously. Our Multi-Zone systems are built on Fire Eater technology, giving the shared cylinder bank, selector valve logic, and control system integration a proven engineering foundation.

How It Works

Each zone has its own detection units and its own connection to the control panel. When fire is confirmed in a zone, the control panel first opens that zone’s dedicated selector valve, then triggers the discharge valves on the shared cylinder bank — either directly via a solenoid actuator or through a pilot actuator that relays the signal from one master cylinder to the rest of the bank. Gas flows through the manifold into the pipe run directed by whichever selector valve is open, then out through that zone’s nozzles; because every other zone’s selector valve stays closed, no gas leaks into any other space.

Pressure switches monitor both the cylinder bank and each zone’s pipe run, reporting any leak or discharge event back to the control panel. Once a zone has discharged, the cylinder bank must be refilled — during that window, the system cannot protect the other zones, a point that needs to be built into operating procedures.

System Architecture

At the center of a Multi-Zone architecture sit the shared cylinder bank, serving multiple zones, and a dedicated selector valve for each zone. Beyond that, the manifold, discharge valve, solenoid actuator, pilot actuator, pressure switch, control panel, detection units, and alarm units make up the system’s other core components. The pilot actuator relays a pneumatic trigger signal from a master cylinder to the rest of the bank, eliminating the need to fit a separate solenoid to every individual cylinder.

The central value proposition of this architecture lies in how the cylinder bank is sized: rather than being sized for the sum of every zone’s needs, the shared bank only needs to cover the largest single zone. For example, in a facility where three zones would separately require 30, 20, and 10 cylinders, a Stand-Alone approach would need 60 cylinders in total — but a shared Multi-Zone bank can protect all three zones with just 30. That difference translates directly into project savings in both cylinder footprint and hardware cost.

When to Choose It

Multi-Zone architecture is the right choice for large facilities with multiple fire-separated compartments where simultaneous fires across more than one compartment are not considered a realistic scenario: large data centers with multiple server halls, manufacturing facilities with several process areas, and power generation/distribution facilities with numerous technical spaces are all typical examples. On projects like these, the space and cost efficiency of a shared cylinder bank is a clear advantage — provided it’s evaluated alongside the architecture’s underlying single-zone fire assumption.

By contrast, on projects where zones are few, independent of one another, or where the risk of simultaneous multi-zone fire can’t be ruled out, a Stand-Alone architecture — with its own dedicated hardware per zone — may be the more appropriate choice. Settling on the right architecture means weighing the number of zones, their sizes, and the facility’s risk profile together at the design stage.

Stand Alone and Multi-Zone architectures apply to all gas suppression systems; agents and applications are compared on our home page.