Gas thermostats
Páginas: 3 (711 palabras)
Publicado: 8 de abril de 2011
República Bolivariana de Venezuela
Ministerio del Poder Popular para la Educación Universitaria
Universidad Nacional Experimental “Rafael María Baralt”
Sede- Los Puertos de AltagraciaCátedra: Inglés II
Prof.: Marlon Céspedes
Bachilleres:
Jimenez, Adriana
Beuses, Krisbell
Peña, Lilissette
Febrero de 2011
Gas thermostats
The operation of the common typesof thermostats depends on a well-known physical principle, namely, that matter increases in volume with a rise in temperature and contracts when the temperature drops. This principle is seen at workin the ordinary thermometer. With a rise in temperature the volume of liquid in the bulb increases and it is forced to a higher level in the stem. As the temperature drops the liquid contracts and goesto a lower level. The thermometer scale, instead of registering the volume of the liquid, indicates the corresponding temperature.
Applying this principle to the thermostat, the mechanicalenergy and resulting motion produced by changes in temperature are utilized to operate a gas valve or an electric switch. When the set temperature is reached, the expanding medium or temperaturesensing element has moved enough to close the gas valve. When the temperature drops below the setting of the thermostat, the valve opens. Thus the gas valve is made to respond automatically and a uniformtemperature is maintained.
The common gas thermostat operates on the principle described above, but the application of the principle varies with different types. Thermostats used with domesticand commercial appliances may be classified as follows: rod and tube or solid rob type and the hydraulic type.
1. Rod and tube or solid rod type. Sometimes referred to as a rigid couple thermostat,this type depends for its operation on the expansion and contraction of a metal tube, inside of which is a rod communicating with a gas valve.
2. Hydraulic type. This type of thermostat...
Ministerio del Poder Popular para la Educación Universitaria
Universidad Nacional Experimental “Rafael María Baralt”
Sede- Los Puertos de AltagraciaCátedra: Inglés II
Prof.: Marlon Céspedes
Bachilleres:
Jimenez, Adriana
Beuses, Krisbell
Peña, Lilissette
Febrero de 2011
Gas thermostats
The operation of the common typesof thermostats depends on a well-known physical principle, namely, that matter increases in volume with a rise in temperature and contracts when the temperature drops. This principle is seen at workin the ordinary thermometer. With a rise in temperature the volume of liquid in the bulb increases and it is forced to a higher level in the stem. As the temperature drops the liquid contracts and goesto a lower level. The thermometer scale, instead of registering the volume of the liquid, indicates the corresponding temperature.
Applying this principle to the thermostat, the mechanicalenergy and resulting motion produced by changes in temperature are utilized to operate a gas valve or an electric switch. When the set temperature is reached, the expanding medium or temperaturesensing element has moved enough to close the gas valve. When the temperature drops below the setting of the thermostat, the valve opens. Thus the gas valve is made to respond automatically and a uniformtemperature is maintained.
The common gas thermostat operates on the principle described above, but the application of the principle varies with different types. Thermostats used with domesticand commercial appliances may be classified as follows: rod and tube or solid rob type and the hydraulic type.
1. Rod and tube or solid rod type. Sometimes referred to as a rigid couple thermostat,this type depends for its operation on the expansion and contraction of a metal tube, inside of which is a rod communicating with a gas valve.
2. Hydraulic type. This type of thermostat...
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