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In geometry, topology, and related branches of mathematics, a closed set is a set whose complement is an open set. In a topological space, a closed set can be defined as a set which contains all its limit points. In a complete metric space, a closed set is a set which is closed under the limit operation.
This should not be confused with a closed manifold.

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  1. F

    watchdog

    DIYers, odd job people and have a go heroes need not apply. nice to see the "closed shop " is alive and well .
  2. O

    Closed threads etc ?

    Well the arms is just full of closed threads today ! But you know in the public plumbing forum where the threads been moved i can still click them and read so can the joe public read them to ? Just think its silly to still have them there if were trying to look professional and theres threads...
  3. J

    Issue with toilet flush after new siphon and closed couple unit fitted

    Hi there, I fitted a new siphon to my toilet yesterday, also replaced the closed coupling connector, all ok but now I have had to make the screw on the ball cock valve to be at the maxium it can be otherwise the ball float gets stuck on the new siphon and does not stop the water from the inlet...
  4. S

    closed threads

    http://www.ukplumbersforums.co.uk/gas-safe-register-forum-public-forum/51132-betacom-24-cycling-central-heating-mode.html this is the type of thread id like to see moved here rather than closed anyone know what the fault is likley to be?
  5. J

    motorised valve powered closed

    I am looking for a motorised valve that can be powered closed but will open automatically based on a high temperature to a pipe stat or if the powere fails. Any ideas?
  6. J

    motorised valve powered closed

    I am looking for a motorised valve which can be powered closed but will open automatically based on high temperature to a pipe stat or if the power fails. Any ideas
  7. Y

    Unvented Cylinder No Hot Water

    Hi, I have a Tribune Range HE, direct unvented cylinder with a gas boiler. Recently I had a very small leak (more of a weap) from the two port valve on the CH. I isolated the water supply, electricity and closed off the valves I could see directly effecting this circuit. I removed the...
    • Yogiblair
    • Thread
    • central closed cylinder heating hot hot water no hot water unvented unvented cylinder valve water
    • Replies: 56
    • Forum: Plumbing Jobs | The Job-board
  8. S

    Help needed :: convert to open system from closed?

    Hi All I currently have a house with 20+ rads and a closed/pressurised central heating system (Firebird Kerosene) I wish to introduce a "Green 30KW boiler stove" so that i can have a dual system I see online that most say its not possible to have a boiler stove with a presurised system but...
  9. J

    Header tank filling through cold feed.

    Need some help with this one. Have an old 3 pipe system in a pub Which fills the header tank via its cold fill and subsiquently overflows. The cylinder is 2 years old as it was replaced due to to splitting its also had the cf and ov moved to correct location behind pump. It's also had a pump and...
  10. D

    pulsar closed down

    anyone know what happened to that discount plumbing supplier ? anyone know of another as good ? great service while they were in business
  11. B

    Brittony water heater

    Brittony water heater problem. Pilot light ok but when hot tap opened the pilot goes out. Can anyone give advice as to what problem might be. Thanks
  12. M

    Incoming cold water main Isolation valve passing water when closed - replace?

    Hi, I have noticed when the incoming main valve is fully closed it is still passing water possibly as much as 10% of normal flow. This valve is possibly 20 years old. Should I replace with what? The valve in question looks like an ordinary brass tap. Is this correct for mains isolation? if...
    • mikehardy
    • Thread
    • closed cold cold water incoming isolation main merchant passing replace should valve washer water
    • Replies: 8
    • Forum: Plumbing Jobs | The Job-board
  13. N

    ufh actuator stuck closed?

    Hope someone can help me with a problem one wwith one of the 2 zones on my ufh system.one(downstairs)works fine,the other(upstairs bedroom)fails to heat up. I've had room thermostat checked and its fine.thought it could be actuator stuck closed.i took top off but pin appears to be up-does that...
  14. A

    Leaky Motorised Valve

    We have oil-fired CH with 3 motorized valves (for HW, CH and UFCH, downstairs). Recently, I have noticed that the boiler comes on at times when it should not, according to timers and thermostats. WHen this happens, the valves (ACL Lifestyle) are all in the closed position. THe only way to turn...
  15. G

    Leaker isolater valve open or closed

    Firstly great place for plumbing idiots like me to get answers! We discovered a leak above our airing cupboard, after much investigation and tearing up loft insulation, ripping off pipe cladding etc offending pipe and location found. The leak is coming from the screw part of an isolator valve...
  16. J

    Plumbing Business Closed :( Big SALE!

    Due to the closure of my business feel free to check out some bargains!! jamescooperplumbing | eBay
  17. K

    iphone and this site

    recently got an iphone but cant get onto this site from it. anyone else experienced the same problem?:mad2:
  18. M

    Stepped closed couple washer

    Hi There, Have a WC closed couple Washer problem. Does anybody know where I can get a closed couple washer that is stepped. Best way to describe it is a squashed "T" The top of the T sits on the siphon nut and the Vertical penetrates the Pan? Ordered one that looked like it but turned out...
  19. J

    By-pass valve

    Hi. In my plumbing system there is a device labelled 'bypass valve, do not adjust'. It has a scale (with a pointer) marked between 0.05 and 0.5 bar; the rest position is at 0.5. It seems to be connected between the flow and return of the primary coil of the DHW cylinder. What circumstance is...
  20. J

    Fully pumped system

    3 bar pump supplying the house, hot fine, cold sporadic. The cold supply is fine but at the taps it's poor. Stripped the pump down (Stuart Turner) found nothing wrong. It seems to build pressure then loses it within seconds.Anyone any clues or come across this? ta
    • jumpin'
    • Thread
    • across closed fully fully pumped isolator problem pump pumped switch system
    • Replies: 3
    • Forum: Plumbing Jobs | The Job-board
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