Hebei Tongli Valve Group was sued on July 4, 2016 for infringing the design patent product of "Flow Control Valve (Differential Pressure)". On January 30, 2018, a public hearing was held on the case of Hebei Tongli Valve Group's infringement of design patent rights, and the defendant Hebei Tongli Automatic Valve Manufacturing Co., Ltd. was ruled to immediately stop manufacturing, selling, and promising sales from the effective date of this judgment. The infringed patent number is ZL201030109889. x, for the design patented product named "Flow Control Valve (Differential Pressure)", compensation for economic losses of 300,000 yuan and reasonable expenses of 2,000 yuan.