TRV installation

Question

What are the steps to be taken when replacing closed shield valves with TRV’s?

Robert · Accepted Answer

You would drain the heating system, remove each radiator and replace the stem going into the radiator put the radiator back on the wall installing new TRV. Make sure you add inhibitor into the system to the volume of what your water volume is and then refill the system. Turn on your boiler bleed the radiators add water as required to get the preferred pressure..

Michael · Answer

Drain the heating system to lowest points, each radiator downstairs will need draining, trv,s are multi directional now so it doesn't matter, I always try to fit on the right hand side,  unless there's an obstruction.
Unscrew old valves from radiator,  it is usually done to replace both sides as you can get the trvs in pairs
Use ptfe on new valves and tighten up with a radiator spanner or grips.
When all is connected and Drain off valves checked, close airvents on radiators and fill system, put inhibitor in system to protect it, let the air out of lowest points first, furthest away.  Once full check for leaks and test out heating. Radiators may need balancing if replacing both sets.

Damon · Answer

Drain heating system fully. Replace the valves. top up system ensuring you add inhibitor and bleed all radiators.

Tanbir · Answer

Drain the heating system first , if its a system boiler then watch some videos on YouTube. It's easy to get airlock in the system .

Juozas · Answer

Mak sure water supply switch off and radiator drain down

Juan · Answer

Full drain down if required depending on system. Rads do not need to be removed.  Remove trv and locksheilds and also remove rad tails if needed depending on valve type. Once all valves replaced treat with inhibitor re pressure/fill and vent system. Carry out test on heating make sure all working nothing has air locked and nothing is leaking.

Billy · Answer

Depends what system you have? A pressurised system would require draining the pressure/ the whole system and simply swapping the valves over 1 by 1. If it's a gravity fed system you'd have to drain or bung the F&E tank in the loft and then you could swap the valves over.

David’ · Answer

Drain heating system then you can change vavles on ether side of rads

Marcin · Answer

Hire the guy with pipe freezer, so no draining will be required and the water loss will be minimal. Replace the olives on pipes, fit the new valve stems. Make everything tidy and sensible.

Some ppl like valve "snatching" live. But it's a bit cowboy style.

Balazs · Answer

Turn off boiler. 
Close all radiators in the house except the one you want the valve changed on.
Drain the heating system on the floor level where the radiator is (no need to drain the entire system if the radiator is upstairs).
Open bleed valve on the radiator you want to work on.
Once the water stopped coming out you can undo the compression fitting on the side of the radiator where you want to put the trv (most trvs you can buy nowadays are multi directional so can be fitted on either side of the radiator)
Then unscrew the lock shield valve from the radiator and replace it with the trv making sure you apply plenty of P.T.F.E. tape  to ensure a water tight connection.
Reconnect radiator to pipe via the compression fitting.
Recharge system with water to required pressure (if sealed system)
Check for leak. If it holds turn on boiler and test heating works 
Bleed air via radiator valves

TRV installation

Follow Us

Cookies

Manage Cookies

Essential cookies

Analytics & Tracking

Advertising