Radiator terminology: lockshield valves

Some basic central heating questions:
* Whats the difference between a "lockshield" valve and a thermostatic control valve -- the ones with numbers 1 to 10, say, which you turn to control individual radiator temp.
* Thermostatic control valves -- should they be turned clockwise to reduce radiator temp, anti-clockwise to increase radiator temp? Is there a standard direction in which they operate?
Bruce
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
In an earlier contribution to this discussion,

There are actually 3 variations - but 2 of them share many common parts.
Standard manual valves and lockshield valves are the same animal but with different plastic tops. Manual valves have a knob which you can turn - like a tap - to open and close them. Lockshield valves have a cover over the end of the spindle which doesn't rotate it. These are for balancing the system, are turned with a spanner, and then fitted with their tamper-proof cover to prevent the setting being changed.
Thermostatic valves have a wax capsule which expands when it gets hot, and pushes on a plunger which closes the valve - thus providing a degree of automatic temperature control for a room. They have a knob with numbers on to select comfort level. The higher the number set, the hotter the room can get before they shut off. I think you normally get higher numbers by turning the knob anti-clockwise - but it's the numbers which matter, whichever way it turns.
--
Cheers,
Set Square
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Set Square wrote:

To the extent that sometimes when you buy a lockshield valve you actually get the valve with two alternate plastic tops. One that engages with the valve and acts as a knob - turning it into a conventional radiator valve, the other that is just a cover for use in "lockshield mode".
--
Cheers,

John.

/=================================================================\
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.