Appliance Terminology

Automatic Cut-off 
A device used on some regulators to close the main valve in the event of pressure deviation outside of a preset range. Must be reopened manually.

Ceramic Briquettes
These are used underneath grill plates and above burners to enhance BBQ flavors and ensure an even heat distribution.

Ceramic Burner
A ceramic material is used to absorb and reflect heat energy from a gas flame to reinforce and raise the intensity of heat output. This reduces cooking times and reduces energy use.

Control Valve
A mechanically, electrically, or hydraulically operated valve, using an external power source to effect its operation, that modifies the fluid flow characteristics in a process. It consists of a valve connected to an actuator mechanism that is capable of changing the position of the flow controlling element or closure member in the valve in response to a signal from the controlling device.

Diaphragm
A flexible membrane used in a regulator or relief valve to sense changes in downstream pressure and respond to them, thus moving the restricting element or closure member to which it is attached.

Drip Tray
Shallow metal tray located under the burners of a BBQ or Grill to reduce fire risk and improve upkeep of appliance by ensuring any hot oils and fats produced during use are collected ready for disposal. Usually used with a fat absorbing material (such as sand or Fat Absorber).

Electrode
An electrode is an electrical conductor used to make contact with a non-metallic part of a circuit. A high voltage discharge can jump (arch) from the end of an electrode (as an anode) across an air space to discharge on a metal surface (cathode) to create an ignition spark (the arch).

Fat Absorber
This is a non-caking mineral-based material placed in a drip tray, it is used to absorb fats and reduce smells. Similar texture to cat litter.

Flame Failure Device
This is a safety device that reduces the risk of any problems should a flame extinguish. When there is a flame the device senses a high temperature and allows gas to flow. If the flame extinguishes, the device senses a drop in temperature and triggers a valve that stops gas from flowing. Once the flame returns the device allows gas to flow again.

Flame Tamer
This device sits between a gas burner and the underside of a grill plate or hotplate. It is used to protect the burner form excess fats and oils falling into the flame and therefore reducing the chance of a flame being created beyond that produced by the burning gas.

Hot Plate
This s solid grill plate with no open grooves that sits above a gas-grill burner providing a large cooking surface area. Even heat distribution is needed for fire safety and even cooking temperatures for food quality.

Infra-Red
This is a highly intensive radiated heat output, achieved from a short wave heat energy at the highest temperature, with the shortest wave length. Typically the colour of the heating element producing the short heat waves is red/amber/white. The heat wave only heats objects in its path, however these objects can convect heat to surrounding areas once sufficient heat has been absorbed.

Internal Relief Valve
A small, spring loaded pressure relief valve contained within the regulator at the center of the diaphragm to prevent outlet pressure from exceeding a predetermined pressure.

Over Pressure Cut Device
A mechanical device incorporated in a gas pipework system to shutoff the supply of gas when the pressure at the sensing point rises to a predetermined value.

Piezo Ignition
Consists of a small, spring-loaded hammer which, when a button is pressed, hits a crystal of PZT or quartz crystal. Quartz is piezoelectric, which means that it creates a voltage when deformed. This sudden forceful deformation produces a high voltage and subsequent electrical discharge, which ignites the gas. No electric connection is required, though wires are sometimes used to move the sparking location away from the crystal itself. Piezo ignition systems can be operated by either a lever, separate push-button or built into the control knob. Only one spark is generated per turn of the knob or press of the button.

Pitot Tube
A hollow tube that connects the area beneath the regulator diaphragm with the vena contracta area of gas flow. The pitot tube causes the diaphragm to sense a pressure lower than that which exists downstream of the regulator, and thus allows the regulator to open more for any given change in downstream pressure. The result is increased regulator accuracy.

Powder Paint Coating
A paint process that uses dry powder with no solvents for surface finish. Dry powder can be reused, thereby reducing waste and pollutants. The powder coating over a clean surface provides better corrosion resistance than liquid coat.

Pressure Relief Valve
A valve that opens and closes to ensure that pressure does not rise above a predetermined value.

Reflector
This a metal reflective device that allows radiant heat to be reflected to desired directions, and in some cases used to reduce overheating of materials behind the reflector.

Regulator (Valve)
The device which governs the flow of gas to a gas appliance.

Roasting Rack
Used to lift meats above the base of a cooking dish when a roast is to be cooked under a hooded gas grill.

Rotisserie
This device is positioned across a gas grill, raised above the grill plates so that food (normally a meat joint) can be turned automatically around on a pole (spit) ensuring even cooking and distribution of any juices/fats from the food.

Sear Zone
Using infra-red heating and ceramic technology, this is a zone that will generate intense and responsive heating to seal foods (even burning outer skins for effect). The zone is often used with a moving rotisserie to avoid food staying in one place and risk being unintentionally burnt.

Side Burner
On some gas grills there is a separate horizontal ring burner, similar to those on a gas hob, used to heat pans and trays for cooking food. These are used as additional heating surfaces to the grill and various pan and tray shapes can be used.

Teflon Coated
This is a special non-stick coating applied to a cooking surface. Careful use with non-metal utensils and non-scratch cleaning of the surface is in needed to avoid scratching and eventual erosion of the non-stick properties.

Thermostat
A device that automatically maintains a predetermined temperature in an appliance or component.

Tilt Switch
This is a safety device that reduces the risk of any problems should a heater fall over. When a heater is sitting on the floor the switch provides a connection and allows electricity to flow. If the heater falls over, the switch becomes an open circuit and electricity no longer flows, hence disabling the device. Once the heater is set upright again the switch connects the circuit and the heater operates again.

Timer
A timer is used to preset the heater's hours of operation. 24 hour timers can set on/off times over one 24 hour period, then need to be reset. A 7 day/24 hour timers can set on/off times over a week and a 24 hour period (example: you can have an appliance switching on/off every Tuesday and Thursday between 7am and noon).

Trivet
This also known as a hot plate, and is placed between a serving dish/bowl and the heated surface, to protect the serving dish/bowl.

Valve
A device used for the control of fluid or gas. It consists of a fluid retaining assembly, one or more parts between end openings, and a movable closure member which opens, restricts, or closes the parts.

Venturi Tube
This tube is located between a burner and a control valve (operated by the control knob of a gas appliance). This must be kept clean to allow gas to flow from the valve through to the burner. A Venturi is fitted with aeration holes to allow air to be pulled into the fuel air mixture required for combustion.

Vitreous Enamel
Heat treated enamel paint that is cured while drying to provide hard wearing surface protection.

Warming Rack
A wire rack that extends over the width of a hooded gas grill so that food can be kept warm, this removes the need for food to be kept on the flat grilling plates.

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