Two Port motorised valves.

[Agile]

Two port valves are not usually marked with a flow direction.

The two connections are marked "A" and "B".

The spring return types have the port "A" closed when not powered.

I come across a lot of these valves which have been fitted in the unexpected way round.

Is that done because they did not know which way to connect it or is there expected to be a benefit of connecting it the other way?

Tony

 

[gas4you]

I usually only fit Danfoss or Honeywell valves, but I thought they both had arrows on them for flow direction

 

[D_Hailsham]

Two port valves are not usually marked with a flow direction.

Honeywell V4043 has an arrow on the side

The two connections are marked "A" and "B".

The spring return types have the port "A" closed when not powered.

Honeywell also say that flow should be from A to B, presumably so the valve opens in the direction of flow. If it was the other way round, the flow would be trying to close the valve; so the motor would have to work harder to keep the valve open.

I come across a lot of these valves which have been fitted in the unexpected way round.

Is that done because they did not know which way to connect it or is there expected to be a benefit of connecting it the other way?

Ignorance probably definitely no benefit.

 

[Agile]

Honeywell also say that flow should be from A to B, presumably so the valve opens in the direction of flow. If it was the other way round, the flow would be trying to close the valve; so the motor would have to work harder to keep the valve open.

Thats not really significant as the motor still has to "work harder" to close the valve!

I can see that some people might think that if the flow was the other way round then the flow would asist in closing and sealing the valve rather than relying on the spring.

The usual actual problem is that if connected the wrong way then there is a distinct clunk as the flow closes the valve and that can resonate round the system.

Tony

 

[D_Hailsham]

Honeywell also say that flow should be from A to B, presumably so the valve opens in the direction of flow. If it was the other way round, the flow would be trying to close the valve; so the motor would have to work harder to keep the valve open.

Thats not really significant as the motor still has to "work harder" to close the valve!

But the motor does not close the valve, the spring does. Power is removed from the valve motor when it needs to close.

 

[Agile]

Sorry, you are quite right.

So the motor has to do its hardest work to open the valve against the spring.

Nevertheless its so highly geared that the water flow becomes insignificant.

Still no one has come up with a reason why I find so many connected the wrong way round!

Tony

 

[spacethegas]

Ignorance probably

yes they have.

 

[namsag]

D halisham hit the nail on the head ignorance and too lazy to check instructions and have probably been doing it for years.
Usually easiest way to tell on honeywell ,acl, landis and gyr etc etc the end with the lever to open valve is at the inlet end of valve

 

[Softus]

So the motor has to do its hardest work to open the valve against the spring.

Nevertheless its so highly geared that the water flow becomes insignificant.

The gearing is low, not high.

Still no one has come up with a reason why I find so many connected the wrong way round!

It's bleeding obvious - it's because a lot are connected the wrong way around.

Still no-one has come up with the reason why you never use an apostrophe.

 

[Gas2Air]

I've always thought of the 2 port valve as an aortic valve in the heart, opens, wobbles under pressure and wants to shut. If that ventricular valve was the wrong way round i'd die? Agile please forgive me if i'm wrong.

 

[Softus]

I've always thought of the 2 port valve as an aortic valve in the heart, opens, wobbles under pressure and wants to shut.

What on Earth are you on about?

 

[Gas2Air]

I've always thought of the 2 port valve as an aortic valve in the heart, opens, wobbles under pressure and wants to shut.

What on Earth are you on about?

Tony will know, he reminds me of them doctors off the new Harry and Paul series on BBC1.

 

[Softus]

"Tony" is an imaginary, yet convincingly gormless, character invented by the forum member known as Agile.

Whilst in the real world "Agile" can repair complex boilers with subtle faults, "Tony" is free to roam cyberspace, posting basic plumbing misconceptions that would make an apprentice blush, all constructed with the lexical dexterity of a seven year old and the blind prejudice of a half-deaf and urine-soaked eighty year old.

 

[gas4you]

"Tony" is an imaginary, yet convincingly gormless, character invented by the forum member known as Agile.

Whilst in the real world "Agile" can repair complex boilers with subtle faults, "Tony" is free to roam cyberspace, posting basic plumbing misconceptions that would make an apprentice blush, all constructed with the lexical dexterity of a seven year old and the blind prejudice of a half-deaf and urine-soaked eighty year old.

Yet again your comments are priceless Softus. ROFL.

 

[namsag]

Dont mind having a dig a Agile but i think the comment is out of order especially as softas runs to mods to get comments removed