Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to uk.d-i-y
|
|||
|
|||
3 port valve question
On 02/04/2019 08:33, T i m wrote:
snip This was all the rotation I could get (without forcing anything anyway). http://tinypic.com/r/244v3fp/9 Running the system with the MV head off and turning the valve manually wasn't that revealing as the system was already hot and once hot it didn't cool that quickly. Did you see the following page? http://www.freeheatingadvice.com/art...-valve-faults/ I recently had to replace 2 Honywell 3-way valves in the shop which had been in service for around 17 years! Replacement valves were the same length and wiring but the threads were different so had to cut olives off. Partially cutting through the olive so as not to damage pipe then putting a flat-blare screwdriver in the saw cut and rotating fractured the remaining bit of olive without risk to pipe. I'd have thought the spindle should rotate significantly further than the few degrees in your picture. Might be worth changing the valve anyway if it's been in used for 10 years or more, and I'd suggest changing nuts/olives anyway to ensure everything mates up nicely. The old nuts on mine screwed on 2 or 3 rotations onto the valve body before jamming which initially looked like they matched. |
#2
Posted to uk.d-i-y
|
|||
|
|||
3 port valve question
On Tue, 2 Apr 2019 15:25:07 +0100, "www.GymRatZ.co.uk"
wrote: On 02/04/2019 08:33, T i m wrote: snip This was all the rotation I could get (without forcing anything anyway). http://tinypic.com/r/244v3fp/9 Running the system with the MV head off and turning the valve manually wasn't that revealing as the system was already hot and once hot it didn't cool that quickly. Did you see the following page? http://www.freeheatingadvice.com/art...-valve-faults/ I did now, thanks, very interesting / informative. I recently had to replace 2 Honywell 3-way valves in the shop which had been in service for around 17 years! Replacement valves were the same length and wiring but the threads were different so had to cut olives off. Partially cutting through the olive so as not to damage pipe then putting a flat-blare screwdriver in the saw cut and rotating fractured the remaining bit of olive without risk to pipe. Understood. I'd have thought the spindle should rotate significantly further than the few degrees in your picture. Well, from the picture shown on your link (and what Mr Rumm says elsewhere): http://www.freeheatingadvice.com/wp-...valve_ball.jpg .. it looks like the two end 'stops' are when the ball contacts (blocks) each port in turn. With the pump running and turning the valve spindle by hand, you can feel / hear the ball being pushed against the port with quite a bang (suggesting there is a good pressure build up in the valve till the water gets moving through the opposite port, whereas moving it to the opposite end doesn't seem to have the same effect. That might suggest the ball isn't seating quite so well in that port or there isn't quite so much resistance to the build up of pressure in that direction etc? Might be worth changing the valve anyway if it's been in used for 10 years or more, I'll ask her if she knows how long it's been in there (she remembers all sorts of obscure stuff [1]) and it does look like it's not the original fitting. and I'd suggest changing nuts/olives anyway to ensure everything mates up nicely. Understood. The old nuts on mine screwed on 2 or 3 rotations onto the valve body before jamming which initially looked like they matched. I think I'd check that one port (AB) seated fully first and if so, re use them with a bit of paste? Cheers, T i m [1] At 84 she can still clearly remember her days working on inspection and repair during her days at Thorn. ;-) |
#3
Posted to uk.d-i-y
|
|||
|
|||
3 port valve question
On 02/04/2019 15:25, www.GymRatZ.co.uk wrote:
On 02/04/2019 08:33, T i m wrote: snip This was all the rotation I could get (without forcing anything anyway). http://tinypic.com/r/244v3fp/9 Running the system with the MV head off and turning the valve manually wasn't that revealing as the system was already hot and once hot it didn't cool that quickly. Did you see the following page? http://www.freeheatingadvice.com/art...-valve-faults/ I recently had to replace 2 Honywell 3-way valves in the shop which had been in service for around 17 years! Replacement valves were the same length and wiring but the threads were different so had to cut olives off. Partially cutting through the olive so as not to damage pipe then putting a flat-blare screwdriver in the saw cut and rotating fractured the remaining bit of olive without risk to pipe. I'd have thought the spindle should rotate significantly further than the few degrees in your picture. I'm sure I have seen 120degs movement. Might be worth changing the valve anyway if it's been in used for 10 years or more, and I'd suggest changing nuts/olives anyway to ensure everything mates up nicely. The old nuts on mine screwed on 2 or 3 rotations onto the valve body before jamming which initially looked like they matched. Try the new nuts on the old valve, but I have been caught out where they were loose this way and so over-tight when using old nuts on new valve. You can get contraptions to pull olives off too but have never used one. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|