Thermostatic temperature control Thermostatic valves are fantastic for ensuring you have a constant stable temperature without any unplanned temperature rises which waste energy. The valve contains a regulating element which controls the valve opening, maintaining your desired temperature at all times. Simply twist the head to select the heat number you would like and sit back and wait for your radiator to kick into action! As you would imagine, straight connect to the central with the radiator being straight up from the floor horizontally. Straight valves are to be used when your heating pipes are coming out of the floor, the water runs through the valve and in a straight line, as the name suggests. Lockshield valve included Along with the , also included is a nifty lockshield valve. A lockshield valve is used to balance out all the in your home, ensuring they all heat up at the same rate. Once adjusted, the valve has a plastic cap that prevents it from being accidentally altered.