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couplings

A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. The primary purpose of couplings is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both. In a more general context, a coupling can also be a mechanical device that serves to connect the ends of adjacent parts or objects. Couplings do not normally allow disconnection of shafts during operation, however there are torque-limiting couplings which can slip or disconnect when some torque limit is exceeded. Selection, installation and maintenance of couplings can lead to reduced maintenance time and maintenance cost.

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  1. I

    Commercial high pressure system, will hep couplings be stong enought?

    I am having to work on a concealed shower but there is no service valve and so I am having to isolate from a large mixing valve which is linked to several other showers. I am going to add a service valve to make it easier for future maintenance but the pipe connected to the shower is 15mm...
    • Illuminate
    • Thread
    • america commercial couplings high high pressure pressure system usa
    • Replies: 9
    • Forum: USA
  2. E

    Quick release couplings

    I have a customer who owns a fish shop and has asked me to plumb in the water supply. He requires a sink unit with a water supply from 15mm copper fittings. However he has to move the sink frequently to clean behind the unit and i would like to fit quick release couplings onto flexible pipe to...
  3. C

    Drive couplings

    why don't they snap when the oil pump seizes ? ive had one the other day , oil pump completely gone, probably leaking aswell as I had to change bearings in motor as it was a bit hard to turn , but drive coupling was fine, I don't get it why they don't snap like a shear pin on a machine? cant...
  4. Stanios

    Leak on 3" solvent weld coupling - repairable?

    Hello , need advice about a leak on an internal! 3" rain downpipe that decided to leak on glued coupling. I dont encounter 3" so never have any, would have to buy a whole £20 length just to use 10" of it on the repair.. So heres what im wondering.. Its vertical fall and top seal is leaking on...
  5. B

    Do brass female compression couplings always have a 'G' thread (BSP Parallel thread)

    Hi, do brass female straight compression couplings always have a 'G' thread (BSPP thread / BSP Parallel thread)? I ask this because it's likely that I will have to replace a failed water hammer arrestor on the cold feed pipe that leads into my combi boiler and the replacement arrestor that I...
  6. W

    anyone know a national shop/mercha that does good range of flexible rubber couplings?

    From quite small sizes up... Plenty of online sellers but can be a ballache.
  7. S

    Steel Pipe Size and Fittings

    My hot (gravity) and cold (mains) come into the bathroom via galvanised steel (iron?) pipes. My first question is what size are these steel pipes? The pipe OD is about 21.5mm and the steel Tee body diameter is 26.4mm. I need to know this in case I need to buy some more brass iron couplings...
  8. P

    CH Pumps - stupid questions (?)

    Possible stupid newbie question coming up! Q1. I've always wondered... WHY do Central Heating Pumps have such huge couplings on them? I doubt many homes use pipes bigger than 22mm - but the couplings on all the pumps I've ever seen have about 40mm threads. My guess is so you can change the...
  9. B

    What are these?

    Found these in a box of bits, 1/2" compression couplers but what for? Old underground stuff? To keep or lob in with the scrap? Cheers
  10. B

    cheapest place for copper fittings??

    Hi guys, just trying to keep costs down anyone know where the cheapest plaxe for copper fitting is? would plumbfix's trade pack at £94.50 in vat be worth it or can i get it cheaper 75 x 15mm couplings 75 x 15mm elbows 50 x 15mm equal tee's 25 x fitting reducers 15mm 25 x 22mm couplings 25 x...
  11. T

    Joining to cast iron soil stack - best cutting technique?

    How do others cut into cast iron soil stacks. I need to cut into one on Saturday to clear a blockage. In plastic I usually use a 57mm hole saw then fit a blanked waste pipe strap when finished but my drill rips my arm off when it snags. This one in cast iron needs to preserve visual quality so...
    • The Drain Dept.
    • Thread
    • cast iron couplings cutting iron looks oil soil soil stack stack timesaver using
    • Replies: 8
    • Forum: Plumbing Jobs | The Job-board
  12. K

    Tee into a 3.5 inch Copper soil pipe

    Hi, I am installing an additional loo downstairs that needs to be connected to an existing 90mm/ 3.5 inch soil pipe (copper) running to the toilet upstairs. Found something like this but could not find not a Tee: WC Extension Connector for 3 1/2in MKEB - Multikwik - Guttering & Drainage...
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