What Is The Difference Between A Lockshield And Radiator Valve?

Normally the only difference between the wheelhead valve and the lockshield valve is the plastic cap; the wheelhead cap turns its valve whereas the lockshield cap locks its valve in a set position or spins freely without engaging the valve. The manual radiator valves in these photos are Altecnic Eclipse.


Which side of a radiator should a thermostatic valve be fitted? Many modern homes will have TRVs – Thermostatic Radiator Valves – attached to most of the radiators on the opposite side from the lockshield valves. A TRV should always be fitted to the inlet on the radiator and the LSV to the outlet.

what side of the radiator is the lockshield valve?

Systems are normally balanced by adjusting the lockshield valves usually fitted on the return side of each radiator. This ensures that each radiator circuit in the system has an equal pressure drop and receives the correct flow of hot water to heat the space in which it is fitted.

Which direction does water flow through a radiator? Water comes into the radiator from the upper hose at the left of the car, flows through the radiator from left to right, and is picked up at the lower radiator hose on the right side of the vehicle.

do all radiators have a lockshield valve?

Unless your radiators have TRVs fitted, they will usually have a wheelhead and a lockshield valve, one on each end. A matched pair of wheelhead and lockshield valves are usually identical, except for the plastic caps.

Should radiator valve be open or closed? Radiator valves, even though they have a handle, are not meant to be closed or half-open. Closing or opening the valve partially, will not control the heat coming from your radiator. Steam radiator valves must remain fully open at all times.

what is the lockshield valve on a radiator?

The lockshield valve is the valve on a radiator that is usually covered with a plastic cap. The term “lockshield” means that once adjusted, the valve is shielded with the plastic cap that prevents it from being accidentally changed.

Does it matter which side of radiator flow and return? Should TRV's go on the flow or return pipe when fitting to radiators? Answer from Steve Harris, technical services engineer at Wavin: The vast majority of new TRV's are bidirectional and can be fitted to either the flow or return, but it is always good practice to fit them to the flow side.

Should lockshield valve be fully open?

As you progress further away from the boiler, the Lockshield valve will need to open slightly more. It's not uncommon for the Lockshield Valve in the first radiator to be open around one-quarter of a turn, while on the last radiator, it may need to be fully open.

Is the lockshield valve on the flow or return pipe? Lockshield Valve These valves are used to control the amount of water that flows out of the radiator into the return pipework. This allows you to "balance” the radiator, ensuring the water is distributed evenly across your property and helping your radiators to heat up at the same rate.

How do you open the lockshield valve on a radiator?

When the radiators are cool, switch the heating back on and go to the first radiator on your list. Turn the lockshield valve clockwise until it is closed and then open it by a quarter of a turn. Once the radiator has warmed up, take a temperature reading at the pipework leading to one of the valves (7).

Can you change a radiator valve without draining the system?

There are tricks of the trade to exchange water valves without full drain down. once you let the pressure out,with the rest of the system water held in suspension and working PDQ it can be done (you will need to exchange the valve in less than a minute). sometimes the existing radiator and pipe nuts can be reused.

Do you open both valves on a radiator?

Best said: I would say very generally speaking that the first radiator or two on a circuit need their lockshield valves just slightly open, but each rad beyond that should have lockshields increasingly more open until last radiator is full open.

Which side of the radiator turns it on?

Turn valves clockwise to turn your radiator off and anticlockwise to turn it back on.

How do you fix a radiator that won't heat up?

5 Steps to Take When Your Radiators Won't Heat Up Check for Bigger Problems with Your Central Heating & Boiler. Check for Trapped Air and Bleed Your Radiators. Check Your Radiator Valves. Find Out if Your System Needs Powerflushing. Get the Help of a Professional Heating Engineer.

Do you need TRV on all radiators?

You should have thermostatic radiator valves (TRVs) on all radiators but not in the same area as a wall thermostat, it is possible that this room may never get warm enough to turn the boiler off via the wall thermostat if the temperature in this area is being controlled independently by a TRV.

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