Do we still recharge expansion vessel with pump?

[diamondgas]

If you're gonna change one best to practice on an old EV. Easy to change if you've got access, just like changing a tyre schrader

 

[zeebeedee]

Got one in the back yard, got an old Worcester I like to strip down and reassemble when it's quite in work like now, keeps my skills up.

 

[GrahamM]

It all depends on which boiler as to whether i touch the iso's or not!! Usually if the EV's gone so has the PRV. I usually leaver that open and let it run till it stops, then as I pump up the EV, it allows the water to escape and keeps the system pressure atmospheric

Is that not what a PRV is for.:smile:

With nitrogen charged vessels, I assume u have to change to a new EV if it's discharged?

Nitrogen molecules are bigger than oxygen/air molecules so keeps charge longer. That's all it is. Just like some of the fancy makes of cars have their tyres done with this.

I always recomend changing vessel and prv if its gone flat. I find if you recharge it a few months down the line it will loose air again. If its lost air than there must be a fault with the vessel surely? I never ever touch the valves under the boiler, just knock the pressure off and then recharge

I do not recall a call back(within the year anyway) for an E/V that I have attended to and recharged. And I have done many. The new Promaxes tend to be quite popular for it. Don't know if it is a faulty batch of schrader or it is not tight enough and loosing charge within 1-2 years.

You must confirm vessel is not burst, change schrader, recharge to 1bar approx., job done!

 

[REDSAW]

Nitrogen molecules are bigger than oxygen/air molecules so keeps charge longer. That's all it is. Just like some of the fancy makes of cars have their tyres done with this.

you mean just like my mrs red?