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9 comments
Participant

Join Date: Feb 2009
Posts: 1

Two-Way Valves and Three-Way Valves in HVAC Systems

02/05/2009 7:34 AM

Hey Everybody !

What the difference between Two way valve and Three way valve in HVAC System, and were exactly should be used, and also what is the impact of VFD on Chilled water pumps.

Thanks

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Guru

Join Date: Dec 2006
Location: Hop around Toronto, New York & Karachi
Posts: 1850
Good Answers: 19
#1

Re: Two-Way Valves and Three-Way Valves in HVAC Systems

02/05/2009 2:25 PM

???? What are you asking?What the difference between Two way valve and Three way valve. a 2-way is a 2-way valve for on/off & a 3-way is a 3-way valve for mixing or diverting.Why don't you first study VALVES before asking such stupid questions

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I not only use all the brains that I have, but all that I can borrow. Woodrow Wilson
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Anonymous Poster
#4
In reply to #1

Re: Two-Way Valves and Three-Way Valves in HVAC Systems

04/01/2010 7:23 AM

I WANT TO KNOW WHERE WE USING 2WAY VALVE OR WHERE WE USING THREE WAY VALVE

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Participant

Join Date: Feb 2012
Posts: 2
#8
In reply to #4

Re: Two-Way Valves and Three-Way Valves in HVAC Systems

02/26/2012 12:26 AM

dear..

you will use 2 way valve when you have variable pump speed

and 3 way valve when you have constant speed

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Participant

Join Date: Feb 2012
Posts: 2
#9
In reply to #1

Re: Two-Way Valves and Three-Way Valves in HVAC Systems

02/26/2012 12:28 AM

i guess your answer is a stupid answer

the correct answer is

you will use 2 way valve when you have variable pump speed

and 3 way valve when you have constant speed

i guess if i ask you small question you need to study 100 year to have an answer

its not problem or a shame if somone ask a question its a big shame if someone says i know every thing...

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Associate

Join Date: May 2007
Posts: 45
#2

Re: Two-Way Valves and Three-Way Valves in HVAC Systems

02/05/2009 11:05 PM

Sorry ducon!

A 2 way valve can be an on/off. It can be described as 2 way and also be a throttling or modulating valve. A 3 way can open to (on/off or modulating) a second circuit and still allowing the main flow to proceed allbeit with a reduced quantity in the main circuit.

If you have a number of sub-circuits connected in parallel and you install 2 way

valves to feed each sub-circuit from a main supply circuit, then when they are all closed then pressure will build up in the main circuit and stall the circuit and the pump. commonly one would install a 3 way valve at the most remote part of the main circuit such that when, that, sub-circuit closes, the main circuit will not stall, nor will the pump.

hope this helps

Phil

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Guru

Join Date: Dec 2006
Location: Hop around Toronto, New York & Karachi
Posts: 1850
Good Answers: 19
#3
In reply to #2

Re: Two-Way Valves and Three-Way Valves in HVAC Systems

02/06/2009 10:52 AM

Phil thanks I know and you are right but his question was the difference between 2 way & 3 way valve

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I not only use all the brains that I have, but all that I can borrow. Woodrow Wilson
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Anonymous Poster
#5
In reply to #3

Re: Two-Way Valves and Three-Way Valves in HVAC Systems

04/01/2010 7:31 AM

WHY OR WHERE WE R USING DIFFERENCE PRESSURE SWITCH (DPT).& DIFFERENCE PRESSURE VALVE ACTUATOR (DPRVA)

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Anonymous Poster
#6
In reply to #5

Re: Two-Way Valves and Three-Way Valves in HVAC Systems

04/01/2010 7:43 AM

IN HVAC SYSTEM WHY WE R USING PLENIUM BOX

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Anonymous Poster
#7
In reply to #6

Re: Two-Way Valves and Three-Way Valves in HVAC Systems

05/26/2010 3:10 AM

Plenum box basically is a junction box serving and installing one or more purpose , for eg : using it for functional convenience in connecting the ducts which are of diferent angle and there is space constraint for elbow etc., plenum is also provided to take more out lets from a common box.

at times plenum box is used to mount either air filter bank or strip heater banks.

ramchandra

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Users who posted comments:

Anonymous Poster (4); ducon (2); houd (2); philiplyon@optusnet.com.a (1)

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