Manufacture and test of Baiyilun constant temperature control valve of radiator is according to GB/T13927-92EN215-1 standard and through the test of Beijing Construction Project Quality Testing Centre. Our company also has advanced and complete testing and inspecting instrument. thermostatic valve: Product Specifications/Features : Name :Thermostatic radiator valveMaterial :chrome plated headTemperature extent: 6-28°CDN10(3/8"), DN15(1/2"), DN20(3/4"), DN25(1")ANGLE/STRAIGHT is provided