Understanding how a 3 port valve works

[gemma_p]

Can anyone explain how they work in simple terms I'm so confused about them

What is port a
What is port b
Is port ab the inlet

Thanks

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[SafeGasInstall]

flow goes to valve AB
hot water B
Ch A

 

[gemma_p]

Thanks

So water to b goes to cylinder and a goes away when I ask at work people say I confuse them

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[broggo]

Best way to remember

A-A radiator
B-Boiling water


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[Halesowen1]

Just remember B for Bath. Flow comes in the valve then it should be piped up A to heating and B for water.

 

[Megaflo-Experts]

Hot water from boiler goes into AB, and then it either goes to A (heating), or B (to heat the hot water) or both (for hot water and heating).
A ball in the valve can move left, right or sit in the middle. Thereby closing port A, closing port B or in the middle, leaving both A and B open.

 

[SafeGasInstall]

Something to remember they always fail to hot water only !

 

[stevetheplumber]

Something to remember they always fail to hot water only !

ive had them fail in every position, their resting mode is ho****er only

 

[glenno1]

Had 1 fail today in heating

 

[GrahamM]

The default/de-energised position is on HW, but they will seize up in any position.

 

[tamz]

Get an old one and strip it down to see what is inside and how it works.

 

[Poxi]

Try Here

 

[AWheating]

B = Blumin hot water
A = Ate-ing

 

[AWheating]

toms top tips, the 3 port valve - YouTube

3 Port Valves and Y Plan Heating Systems - Plumbing Tips - YouTube

 

[Ged Simpson]

About a year ago I did a write-up of the "Y" plan with a lot of detail regarding the operation of the 3-way valve. It may help some students (it may also confuse others!!) but I haven't had it scrutinised for errors or possible misconceptions. It includes fault-finding but is too long to paste, so can email to anyone who would like a copy as I would appreciate feed-back. You can ask me directly on gedsimpson@hotmail.co.uk