I want to replace a radiator with a towel warmer/radiator and ordered two in line valves for the job from the radiator supplier. I was surprised to receive what appear to be two identical control valves for the job and not one control valve and one lockshield valve. Are lockshield valves not used in towel warmers? If not why not?
Valves and lockshield valves are the same thing. What makes the difference is the application. One is used to control the on/off of the radiator and has a normal cap, the lockshield is used to balance the system by being left partially open. Usually they are fitted with a tamperproof cap, but not always as you can see.