The research of this project can provide a compact structure, convenient installation, good vibration and sound reduction effect, long life, safe and reliable, environment-friendly, maintenance free, pollution-free rail vibration reduction rifle muffler sound device. The implementation of the project is conducive to reduce the track vibration caused by high-speed trains, reduce the transmission of noise, and optimize the environment along the track. In the environment of high temperature (320 ℃) and high pressure (2.0MPa), less materials are selected for reciprocating surface sealing gasket. Generally, the elasticity of materials is small, which can not compensate the gap caused by temperature change. Car muffler needs a kind of gasket material, which has good wear resistance, moisture, pressure and elasticity, and has high cost performance ratio. At present, the company produces gas pressure regulating equipment in accordance with the enterprise standard requirements of GB16802-1997 and Q / 320411-aqf001-2007, and has obtained the production license of urban low, medium and high pressure gas regulators (boxes). It is necessary to develop competitive products in the export of urban gas transmission and distribution equipment. In the fields of power supply, battery, battery, charger and mobile phone, DC electronic load is widely used in power supply, battery, charger and mobile phone. Its measurement items include voltage stabilization, current stabilization accuracy, load regulation rate, transient response and recovery test, start-up and hold time, etc.