As one of the most widely used equipment in the industry, boilers are pressure vessels. The safe use of boilers is related to people's lives and property. Therefore, the last fuse of the boiler = safety valve plays an important role, therefore, the boiler is safe Valve installation must comply with the following technical requirements: 1. For boilers rated steam generation greater than 0.5t / hour, a minimum of two safety valves must be installed: a boiler rated evaporation less than or equal to 0.5t / h, at least one safety valve installed. Separable economizer outlet, steam superheater outlet must be equipped with safety valve. 2. Safety valve should be installed generally exhaust pipe, exhaust pipe should be through a safe place, and have sufficient cross-sectional area to ensure that the exhaust gas flow. Safety valve exhaust pipe should be installed at the bottom received a safe place of the hydrophobic pipe, the exhaust pipe and the hydrophobic pipe are not allowed to install the switch valve. 3. Lever safety valve to prevent the hammer to move their own devices and limit the lever over the guide rails, spring-loaded safety valve to have to lift the handle and prevent the screw to adjust the screw device. 4. For boilers with rated steam pressure less than or equal to 3.82MPa, the throat diameter of safety valve shall not be less than 25mm: for boilers with rated steam pressure greater than 3.82MPa, the throat diameter of safety valve shall not be less than 20mm. 5. Safety valve and the boiler connection pipe, the cross-sectional area of â€‹â€‹not less than the safety valve inlet cross-sectional area. If several safety valves are fitted together on a short pipe connected directly to the drum, the cross-sectional area of â€‹â€‹the short pipe should not be 1.25 times the area of â€‹â€‹the exhaust of all safety valves. (6) Safety valve must be installed vertically in the drum, the highest position of the header. Between safety valve and drum or header, there shall be no steam outlet pipe and valve. 7. Boiler safety valve must be regularly manual or automatic discharge test, because the safety valve body and valve will be sticky, regular tests to prevent adhesion, and check the relief valve opening pressure is accurate and meet the requirements.
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