... (Normal diameter) DN20, DN25. straight valves, angle valves, three way cross valves are all in our production line. ... in a safe place. Unless your valves come with an OFF position. You will need those screw ... need to be removed to fit the plastic shut-off cap on the valve). You may otherwise fine ... and waste energy.9/ History of Thermostatic radiator valves. Many years ago, the 1st ideas for heating ...