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26-02-2010, 10:33 PM #1
Three questions about expansion valves
Hello
1 - Do TEV's (internally or externally equalised) have to be fitted on a horizontal pipe or can they go on the vertical? If so, can the bulb go on the vertical?
2 - What limits the distance between the TEV and evaporator inlet? (Without changing the design)? Would 500mm on a typical cellar cooler be ok for example?
3 - Is it ok to use reducers either side of a TEV?
Thanks.Last edited by Contactor; 27-02-2010 at 07:21 AM. Reason: to add third question
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26-02-2010, 10:47 PM #2
Re: Three questions about expansion valves
Three questions but only two numbered, you're trying to trick us
Quote from the Sporlan documents on TEV...
TEVs may be mounted in any position, but they should be installed
as close to the evaporator as possible.
Have a read up on their literature, there is a lot that can be learned from them, I know I do.
http://www.sporlanonline.com/literature.shtmlBrian - Newton Abbot, Devon, UK
Retired March 2015
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27-02-2010, 07:42 AM #3
Re: Three questions about expansion valves
thanks brian
third quetion now added, apologies
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27-02-2010, 11:21 AM #4
Re: Three questions about expansion valves
In most split and multisplit systems, the expansion valve is in the outdoor unit, so....
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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27-02-2010, 01:33 PM #5
Re: Three questions about expansion valves
This is for a lu-ve cellar cooler and two lu-ve cabinet evaporators. Lu've instructions say the TEV should be directly onto the distributor and that the bulb has to be 500mm away, but I don't have room.
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27-02-2010, 11:38 PM #6
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03-03-2010, 11:10 AM #7
Re: Three questions about expansion valves
Hey Peter,
yore wright to, but this is because the are reverseble heating/cooling.....yes?
Ice
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03-03-2010, 02:17 PM #8
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03-03-2010, 05:41 PM #9
Re: Three questions about expansion valves
noise limitation in the indoor unit = true
tip : always check the way the bulp or sensor is connected to the tube. (this could save compressor lives )Last edited by frederik79; 03-03-2010 at 06:05 PM.
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08-05-2010, 08:41 PM #10
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08-05-2010, 08:45 PM #11
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09-05-2010, 08:06 AM #12
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09-05-2010, 08:15 AM #13
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09-05-2010, 09:11 AM #14
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Re: Three questions about expansion valves
Last edited by nike123; 09-05-2010 at 09:14 AM.
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12-05-2010, 08:25 PM #15
Re: Three questions about expansion valves
Presumably Danfoss are saying that because they have to have something to design to rather than being essential. Also pointing it downwards on the vertical would be under ideal conditions.
I suppose if you have it one metre away at an angle it will still do the job, right?
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07-06-2010, 06:24 PM #16
Re: Three questions about expansion valves
If you have some distance between TXV & distributor, try to make the elbows - if any - as large radius sweeps. What most of the literature is really bleating about is trying to keep the 2-phase fluid as a mixture rather than have it separate into a liquid only & vapour only stream. This could make the distributor's life a little more tricky.
Noise can also become a bit of an issue with long lengths plus elbows between TXV & distributor.
Can you do it? Yes, sure - it works, as long as you are careful. If it didn't, then how on earth do the TXV's in outdoor units get the job done? How many techs bother overly with the 2-phase line between outdoor unit & indoor evap?Last edited by desA; 07-06-2010 at 06:27 PM.
Engineering Specialist - Cuprobraze, Nocolok, CD Technology
Rarefied Technologies ( SE Asia )
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07-06-2010, 08:34 PM #17
Re: Three questions about expansion valves
Bulbs ideally on horizontal, you can use reducers either side of the valve, can you place even a short piece of pipe vertically into the distributor? I've stuck valves externally to rooms especially where space is tight.
alec
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