Search the forum,

closed

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.

View More On Wikipedia.org
Recent contents Top users
  1. DiamondHead

    Leaking radiator on which I closed the valve

    I have a radiator on the landing that was leaking on the right hand end beneath the temperature dial 6 months ago and I was advised to turn the valve on the other end off because I don't use the radiator and it was either that or replace parts. Problem solved. Until now when the valve itself, on...
  2. S

    Loud bangs from boiler after draining system - closed valve?

    Hi I drained my system today as I was trying (and failed) to install new radiator valves. I have just switched the heating on this evening and the boiler suddenly made loud bangs so i hurriedly switched the heating off. There are 2 valves in the loft, one which turned off the water in the...
  3. B

    Motorised valve allowing water flow even though spindle closed

    hi. I removed actuator from motorised valve. Spindle at 12 noon so valve should be closed. However hot is flowing through the valve. I can manually turn the spindle about 20 degrees. Is it possible the gland inside is not turning even though spindle is? Many thanks.
    • Barry Clark
    • Thread
    • closed flow motorised motorised valve spindle though valve water
    • Replies: 15
    • Forum: Plumbing Jobs | The Job-board
  4. M

    2 bypass valves??

    Hi all, Can anyone tell me what these two manual valves are and what they should be set at? So far as I can tell, the lowest one (closest to tank) is the manual bypass and should be set to partially open but the other one has me stumped. What is it and should it be open or closed? Thanks in...
  5. D

    Pump overrun issue thread closed

    I have just had my question, which was asked honestly and in good faith, closed unceremoniously by someone who accused me of "fishing" instead of calling an engineer. The accused should be allowed right of appeal, especially when injustice is so obvious. Not sure what "fishing" refers to but I...
  6. R

    Wood boiler ch

    Living in france and my wood burning furnance for the central heating only , has just split the jacket ! it had been fitted in a closed curcuit without auto matic quench system ! Not by me ! Reason failed pump Having great difficulty finding a 50 kW + wood boiler with quench system ? Does...
  7. T

    To the forum mod who closed my thread.

    What made you uncomfortable about my thread? Did I break a rule or something?
  8. T

    Turning off the central heating

    When the warmer weather arrives and it's time to turn off the central heating what's the best position to leave the radiator TRV's in. Do people leave them in their current position or open them fully or fully closed. As I found out in an earlier post the radiator valve has a pin in it and I...
  9. S

    Cutting into a closed system

    My brother is fixing up a house and after lifting up the concrete floors, all copper pipes where damaged! It's a closed system and were wanting to know, is it a case of just connecting new pipes to same, fill up with water then turn on or is it alot more tricky than a open gravity fed system...
  10. Chalked

    Best way to fit a bypass for a whole house pump

    When fitting a whole house pump with break tank, I tee on the water main after the pump ( with a stop tap and double check valve). This enables the customer to still get water if there is a power cut. Does anyone know of a normally closed valve, that will open on power failure, so this can be...
  11. B

    Red wheelie valve in airing cupboard

    Could you please tell me what the function of the red "Wheelie" valve, (picture attached) situated in my airing cupboard and whether it should be open or closed. Thanks
  12. T

    Central Heating very hot water

    Our CH closed system water is coming out of the taps at 70 deg C turned stat on tank down to beloe 50 deg C and no change. removed motor from 3 way valve and made sure valve turns and that the motor changes from watre to heating when switched off. Ran boiler with water turned off and valve...
    • t-ward3
    • Thread
    • central central heating closed heating hot hot water motor turned valve water
    • Replies: 1
    • Forum: Plumbing Jobs | The Job-board
  13. D

    Rads different temperature

    Some rads get very hot and some get warm .if I screw the lockshield valve in a little on the hottest ones ,will this make the warm ones get hotter ? Thanks
  14. H

    Valliant ecotec plus 837 losing pressure

    Valliant ecotec plus 837 losing pressure every few days. Boiler in loft with flue venting outside to house apex. Boiler 2 years old. Forgot to look at error message this morning so unsure of error message but when filled from two taps underneath it can last 2-3 days without losing pressure...
    • HGF69
    • Thread
    • boiler closed ecotec ecotec plus ecotec plus 837 error helpful losing plus pressure valliant
    • Replies: 7
    • Forum: Plumbing Jobs | The Job-board
  15. O

    Re: Where can I get a 6m length of yellow PVC soft copper coil ???? who closed thread

    just to clarify I am not diy ing the job I object to being ripped off by so called tradesmen who over charge for parts and cant do the job properly. i.e. they cant bend a pipe because they do not have the correct bender 1) the parts cost me approx £140 but as quoted well over this £200 plus 2)...
  16. J

    Why hast my previous thread been closed?

    Hello, i'm a time served plumber working for a nationwide housing association and wasn't planning on messing about with gas, i want to know what it might be before i get one of the gas lads from work to fix it for me. Looking at other threads people are getting advice so why have i been shut down?
  17. S

    Radiator rattling even if closed off

    Hello, i've got this horrible radiator that keeps rattling like a tapping noise when the heating is on, it will rattle every 20mins and even if i turn the valve off together with the lock shield it will still rattle ?? obviously it won't rattle when the heating is off anyone help i'm going...
  18. jaydebruyne

    Back to wall closed couple toilet

    Is there an easy way to fit pan fixings to the floor on a back to wall pan? Other than measuring the distance from the wall to the hole and the distance between the inside of the pan width????
  19. Inverness

    honey well motorised valve without a manual lever

    As anyone came across a motorised valve without the manual lever? I had one with was a honey well 28 mm the merchant said it's for back boilers and they open up when a power cut has occurred. They are hard wired in. Can someone explain there purpose and where there location is on a heating...
  20. M

    Closed off second lead pipe in kitchen

    Hi, We live in a lower flat (one up/one down) and the mains water is delivered to both flats from a single on pavement stopcock. Our central heating system is fed from a tank above the boiler and I believe that this tank is fed from another tank in the upstairs flat's loft. When running the...
Creating content since 2001. Untold Media.

Newest Plumbing Threads

Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock