The pressure resistance of molded reducer * temperature resistance, pressure resistance, good flexibility and heat resistance, its performance is higher than other plastic pipes. Easy installation, good thermal conductivity, suitable for floor heating system, recyclable. Elbow pipe fittings have excellent impact strength, hot-melt welding and mechanical connection, superior to the thermal conductivity of pb-pp-r. Long term pressure resistance, only from the design stress point of view, the pressure resistance of elbow fittings *. However, due to various factors, the actual wall thickness of floor heating pipe is usually 2mm. However, under this wall thickness, all kinds of pipes can meet the requirements of floor heating, and the pressure resistance advantage of elbow fittings cannot be reflected; only from the design stress, the pressure resistance performance of elbow fittings *. If the selected diameter of reducer is inconsistent with the inner diameter of process pipe, corresponding reducing or expanding treatment shall be carried out. If the pipe is contracted, whether the pressure loss caused by this will affect the process flow shall be considered. In order to prevent the installation of reducer from affecting the distribution of flow field, causing pressure loss and reducing the measurement accuracy of electromagnetic flowmeter, the molded reducer shall The center cone angle α is not more than 15 °. The smaller the angle is, the better. High pressure reducer pipe fitting is a kind of technology for metal pipe processing reducer elbow and reducer joint.