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Site Manual
Alarm 2000 Iss 5
20
3.3.5 Gas Shutdown Module:
GAS SHUTDOWN SYSTEM
MAIN VALVE OPEN PRESSURE FAULT
RESET TEST ISOLATE
The Gas Shutdown System is composed of high quality, proven components to ensure
safe, reliable protection of a gas pipe-work system that does not have existing safety shut
off equipment. For example, open stove burners in kitchens, or gas Bunsen burners in a
laboratory. The Gas Shutdown System can also guard against restoring gas if downstream
pipe-work is damaged or a gas outlet is open. The system consists of two principle
components, the gas shutdown module and Gas Valve/flexible coupling assembly.
The gas shutdown module is designed to be interlocked with sprinkler systems, fire and
smoke detection systems, gas detection systems or emergency stop devices, so that in
the event of an emergency the gas supply can be automatically shutdown as well as
providing outputs for gas valve and occupant warning system actuation.
The Gas Valve Assembly is designed to provide the main gas shut off valve, bypass valve,
bypass valve flow adjuster and gas pressure switch as a pre-assembled, pre-tested
module. This, together with the flexible coupling provided, ensures both ease and
consistency of installation. This modular format also facilitates any servicing or
maintenance that may become required. The valve assembly comes standard in 25mm,
but can be configured up to 150mm.
To properly configure and size the system, the following need to be considered.
Interlocking systems or emergency device requirements

Gas Type

Gas Pressure

Gas Flow

Control Voltage
HOW IT WORKS
Where an unsupervised burner may be extinguished by the operation of an emergency
stop device, sprinkler system or manual valve, it is essential that the gas cannot be
restored unless all of the gas burners are off, and the associated pipe-work remains
undamaged.
The gas shutdown system, when properly installed and commissioned, guards against the
accidental restoration of gas when gas burners are left on or pipe-work damaged.
The main gas isolating solenoid valve is installed in the gas supply to the unsupervised
appliances. When the gas supply needs to be isolated, power to the main gas solenoid
valve is interrupted and the valve closes. Before the main gas solenoid valve can re-
opened, the pressure in the downstream gas pipe-work is verified by a pressure switch.