Common valve generally have the following: 1, according to the form of the overall structure and the structure can be divided into weight load lever valve, spring-loaded safety valves and control type three kinds. 2, according to the valve type open than the height of the flow diameter of the valve can be divided into Weiqi and safety valve. 3, according to the safety valve gas emissions can be divided into fully enclosed, semi-enclosed and open three kinds of operational matters valve installed outdoors should take appropriate precautions safety valve to prevent rain and fog, dust, rust, dirt, etc. dirt invasive valve and discharge pipe, when the environment is below zero degrees Celsius, but also to take the necessary measures to ensure the reliability of the safety valve frost action. When the gas valve to operate in addition to compliance with this regulation, it should also comply with the "Pressure Vessel Safety Technology Supervision" and "safety valve safety technology supervision order" (TSG ZF001-2004) regulations. Maintenance 1, for the rated steam pressure less than or equal to 3.82MPa boiler A40YC spring safety valve, safety valve throat diameter of not less than 25mm; For the rated steam pressure is greater than 3.82MPa boiler safety valve throat diameter of not less than 20mm. 2, the valve should normally be installed exhaust pipe, exhaust pipe should be through a safe place Shandong valve, and there is sufficient cross-sectional area, to ensure the smooth flow of the exhaust. Valve exhaust pipe at the bottom should have received a place of safety posturing drainage pipe, the exhaust pipe and the installation of drainage pipe valves are not allowed. A40YC spring safety valve manufacturers _ Everbright valve (certified) _ safety valve provided by Shandong China Everbright Limited valve. Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com) Shandong Weifang, ball leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Everbright valve leadership with the staff warmly welcome all inquiries negotiations to create a better future for China Everbright valve.