We always thought Lockshield Valves were the SAME!!? WHO KNEW!? 

I second what Terry says - a video on auto bypass would be great.

Absolutely love the content you guys are putting out. Really informative but still entertaining. Keep it up boys!

Great Video introducing valve authority. Would love to see one on auto bypass valves, well done chaps 👍

Love this! Feels like good old school days xx

It looks like I have regutecs fitted to a few of my radiators ! As they don’t look like normal lockshields ( the exposed shaft when you take off the plastic cap / no plastic cap ) I though they were just wierd elbow and darn’t ever take off the cap encase I caused a leak ha ! Interestingly on the radiators fitted with the regutecs have oventrop TRV’s which actually have a flow restriction function it seams ( had one apart in my garage ) I now know that all lock shields aren’t made equally, I’ve got some rubbish on/off ones upstairs and they are horrible to try and control flow. Great video as always, I’m learning loads and I’m not even a heating engineer 👍

Great video thanks for sharing all the detail.

Great video, thank Adam. I’d been struggling to get 3 radiators going on a 17 radiator microbore system. Now all is hot. Turns out the way I’d been told how to balance systems does next to nothing.

Good content Adam, well presented and easy to understand.

Brilliant video. Thanks again guys 👍

It would have been good to see the IMI Eclipse AFC valve in your demo. Good video though. Something no one ever does, I know I have never done this but I should do to see how different valves perform.

After watching, I went and had a look through my box of valves. Initially I was surprised that the lockshield Drayton supplies with a TRV4 or their RT414 had the biggest bore for maximum flow and didn't seem to have many turns to open it fully. I initially thought why is the lockshield with the RT212 performing better? At least to my untrained eye from what you video teaches. The cheaper Lockshield has a smaller restriction in it and seems like it has more accurate adjustment at the fine end. Anyway, it took me a few moments and then I realised that the RT414/TRV4 valve body should be balanced on the TRV end with Drayton's key. Also another sidenote, the Plumbright branded TRV and Lockshield that I have here also looks like it could be a good performer. Nice restriction and appears to have good control at the smaller end of things. Haven't actually tested any as you have, just eyeballing them to give me an idea.

Such educational content & well happy I fell upon this. One quick question is..... apart from potentially needing my whole system balanced (underfloor heating not working anymore !) could I just purely have lock shields either end of my two lounge radiators ? Obviously I need to understand the lock shields flow rates & authority, but looking at removing the ugliness of most TRV's & would like my radiators more or less looking like a Towel Rail. Again, many thanks for this ridiculously educational video, keep up the great work

awesome vid guys

Absolutely fascinating stuff. I like how you can turn on/off those valves without messing up set flow rate, you can also set the flow rate on the Trv4 and Honeywell’s counterpart. Would be interesting to see how pegler would fair in this experiment as they are regarded as a gold standard valve. ?

Thanks for sharing! Can you do this for an underfloor heating manifold flow valves?

Great video, who would have thought with that cheap 3/4 valve, interesting to see the test results.

Good content as usual

What tools I need and how do I balance as a DIY user

Hello mate. Thank you for this information, its very helpful

Good vid!-subscribed

Radical T shirt ! ... Good info.

Does the smaller aperture and resistance of flow hurt cop on heatpumps?

Helpful vid. Thanks! Maybe do a vid on how you balance a system, especially with those lock shields which are just iso valves. 🙄

Can you share a link for that cheapest but quite good valve please ? Thanks

I have smart Trv's fitted so it's not unusual to just have on one/two or three rads on at a time and I have all the lock shields fully open (I have a 1970's system boiler ). Is this wrong ? Maybe causes an issue with delta T ?

Is it better to have them as closed as possible or as open as possible? Assuming that the heat demand is satisfied.

Great video, dodgy t-shirt! ✝😄

Do love the channel, really great info but have to say that t-shirts an instant trigger point

Where can I get a heat geek hat ?

I have the danfoss is there anyway of adding a white knob to it to adjust it rather than having to get out an Allen key every time?

I use Altecnic Eclipse valves which have a large bore (about 14mm on 15mm pipe) and 13mm travel). What do you think of those? The heating is quieter and warms up quicker than with most others I've used which have small bores and little travel.

Cool t shirt

A plug and a gland are not the same thing. The valve gland/packing is what stops liquid leaking from the stem of the valve.

It’s the little stuff

Where can you get the IMI Valves?

👍👍

An increased local headloss due to small opening through a valve doesn't give greater flow control what BS. What matters if you can set to different opening from shut to fully open. Learn some hydraulics and bernouli equation.

A plug and a gland are not the same thing. The valve gland/packing is what stops liquid leaking from the stem of the valve.