Paragraph 1 I1

In this Schedule—

• “check valve” means a device which permits the flow of gas in one direction and prevents the flow of gas in the opposite direction;

• “design pressure” means the pressure which a part of a gas system has been designed and constructed safely to withstand;

• “double-check valve” means a device which consists of two check valves in series and which permits the flow of gas in one direction and prevents the flow of gas in the opposite direction;

• F1“electrically operated valve” means a device which is electrically operated and opens when the ignition is switched on and closes when the ignition is switched off or the power is otherwise cut off;

• “excess flow valve” means a device which automatically and instantaneously reduces to a minimum the flow of gas through the valve when the flow rate exceeds a set value;

• “fixed gas container” means a gas container which is attached to a vehicle permanently and in such a manner that the container can be filled without being moved;

• “gas container” means any container, not being a container for the carriage of gas as goods, which is fitted to or carried on a motor vehicle or trailer and is intended for the storage of gas for either—

  1. (a)

     the propulsion of the motor vehicle, or

  2. (b)

     the operation of a gas-fired appliance;

• “high pressure” means a pressure exceeding 1.0325 bar absolute;

• “high pressure pipeline” means a pipeline intended to contain gas at high pressure;

• “pipeline” means any pipe or passage connecting any two parts of a gas propulsion system of a vehicle or of a gas-fired appliance supply system on a vehicle or any two points on the same part of any such system;

• “portable gas container” means a gas container which may be attached to a vehicle but which can readily be removed;

• “pressure relief valve” means a device which opens automatically when the pressure in the part of the gas system to which it is fitted exceeds a set value, reaches its maximum flow capacity when the set valve is exceeded by 10% and closes automatically when the pressure falls below a set value ; and

• “reducing valve” means a device which automatically reduces the pressure of the gas passing through it, and includes regulator devices.