DIY Doctor

Main navigation

Is a Zone Valve Manual Lever Needed?

Postby diymechanicalguy » Tue Jul 24, 2018 12:15 am

Hi all - new here and just looking for some generic advice on zone valves manual levers.
I'm looking to use something similar to this:

I know there are zone valves on the market with manual levers, but this one doesn't have them. It seems that a manual lever for these isn't really required. The ones that have the manual lever I believe are spring closed. Therefore, the lever will just simply open them allowing heating. I don't live in the tundra, so immediate heating if it goes out isn't the end of the world. Any other reason to have it?

Thanks in advance.

Read more: ... z5M7tuGray
Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Tue Jul 24, 2018 12:12 am


Simply Build It

Postby diymechanicalguy » Wed Jul 25, 2018 3:34 am

Shoot, bad link in the first one.
Maybe this one will help:
Once again, thanks!
Rank: Labourer
Progress to next rank:
Posts: 2
Joined: Tue Jul 24, 2018 12:12 am

Postby ericmark » Tue Jul 31, 2018 5:45 pm

The manual lever is so you can bleed the system, so it depends if you can bleed the system without the lever.

Zone valves are really something from the past, they are still used with under floor heating, but the temperature is a lot lower with underfloor heating.

Short history lesson, to get the boiler to use the latent heat the return water temperature needs careful control, so there has been a move from digital (on/off) to analogue, the TRV slowly opens and closes and so does the by-pass valve.

Where a wall thermostat is used it connects to the ebus and modulates the boiler it does not switch it on/off. There is an exception, the boiler will never turn off without either manual or thermostats intervention, it would first of all modulate then the boiler would start cycling, so fitting a thermostat in the coldest, down stairs room with no outside doors or alternative heating will turn off the system as it gets warmer and stop is cycling.

With a non spring return motorised valve you could in theory allow it to part open, not seen one, but that does not mean they don't exist. With eTRV heads they do open a bit at a time, you can hear the motor.
Rank: Project Manager
Posts: 2659
Joined: Fri Oct 02, 2009 8:49 pm
Location: Llanfair Caereinion, Mid Wales.

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics