radiator valves

what is the difference between a lock shield valve and a wheel head valve on a C.H. radiator

Reply to
Jo King
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A wheel head enables opening/closing the valve, a lock shield prevents opening/closing.

Reply to
Rob Morley

"Jo King" wrote in news:dim86s$s0d$ snipped-for-privacy@news8.svr.pol.co.uk:

Nothing at all, physically; the lockshield has a cover, not a knob, as it's not an operational control, but is set by the Guild approved wizard in the commissioning rite called balancing, and it must nevermore be touched by unconsecrated hands.

The wheel valve changes the rad from ARF mode to ARN condition and vice versa, and is fitted with a knob to enable muppets to do this without danger

mike

Reply to
mike ring

Nothing. The metal part of the valve is identical. Valves are often supplied with 2 plastic tops - one which has a square hole in it for rotating the shaft of the valve - and one which is just a tamper-proof cover, so that the valve becomes a lockshield when this is fitted. The lockshield valve is adjusted during system balancing - and then left in its partially open state thereafter. The other valve is used to turn the rad on and off, as required.

Reply to
Set Square

On that topic, has anyone else noticed that a number of lockshields these days come with covers that are very loose fitting? I have about three new ones where the lockshield cover only really rests in place - there is no real positive "click" as it goes into position.

Reply to
John Rumm

John Rumm wrote in news:434f06c4$0$49800$ snipped-for-privacy@ptn-nntp-reader04.plus.net:

Admittedly I've only been at it for 5 yrs or so, but I've never met any other sort

mike

Reply to
mike ring

mike ring wrote in news:Xns96EFC61D9D0BBmikeringbtinternetco@130.133.1.4:

......than the dead loose ones :-0

mike

Reply to
mike ring

I can remember lockshields where the covers were secured with a screw!

Reply to
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