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fill valve

A gas-filled tube, also commonly known as a discharge tube or formerly as a Plücker tube, is an arrangement of electrodes in a gas within an insulating, temperature-resistant envelope. Gas-filled tubes exploit phenomena related to electric discharge in gases, and operate by ionizing the gas with an applied voltage sufficient to cause electrical conduction by the underlying phenomena of the Townsend discharge. A gas-discharge lamp is an electric light using a gas-filled tube; these include fluorescent lamps, metal-halide lamps, sodium-vapor lamps, and neon lights. Specialized gas-filled tubes such as krytrons, thyratrons, and ignitrons are used as switching devices in electric devices.
The voltage required to initiate and sustain discharge is dependent on the pressure and composition of the fill gas and geometry of the tube. Although the envelope is typically glass, power tubes often use ceramics, and military tubes often use glass-lined metal. Both hot cathode and cold cathode type devices are encountered.

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  1. P

    fill valve

    hello all ive a job where i need to fit a fiil valve in the cistern never seen one like this though but it has a bit of thin plastic pipe coming from the fill valve at the top to the flush valve im trying to get a similar type as i dont want to change th flush valve as well very enclosed space...
  2. A

    Hammer due to cistern fill valve

    Just been to look at a house where there is terrible hammer caused by the cistern fill valve opening and closing (hunting) some time after the cistern is full. Usually when another tap is opened, presumably upsetting the pressure balance in the seal. Also apparantly happens late at night...
  3. G

    Constantly filling toilet, issue with fill valve.

    I have been to a customers house today with an issue with her toilet cistern constantly filling with water non stop. It's not leaking over as it's draining away down the bowl. It's an Italian toilet called an Axa. They don't even have a website. The cistern does not have a ball cock so it's not...
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  4. B

    Need a very quiet Toilet fill valve?

    The problem is, that I have to replace the fill valve on my toilet & am looking for a very quiet & reliable toilet fill valve to replace my current valve. This is because bathroom is right next to bedroom & each time its used it’s very noisy when filling up at night & wakes every one up in...
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  5. A

    fill valve/ 1/2 tap connector

    went to a job today, customers son told his mother that the fill valve was knackered and bought her a new one, been asked to fit it. feed was from the base of the cystern, how easy is this i thought but low and behold the fill valve does not connect using a 1/2 tap con the thread is entirely...
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