Ball valve is used for opening and closing the ball with a circular through hole, the ball core with the valve stem around the center line rotation in order to achieve the purpose of opening and closing the valve. 1. Body material should be made of PPH, RPP, PE, PVDF, CPVC, UPVC raw materials, sealing seat made of high wear-resistant polytetrafluoroethylene (PTFE) material, the sealing ring using PTFE high Anti-wear material made. 2. Body and pipeline to undertake specifications to be consistent with DIN, GB, ASTM, JIS and other standards, so that the overall pipeline system to achieve uniform standards. 3. Valve design and testing strictly in line with Q / BT02-1999 I. Installation work: 1. Check the flange ball valve specifications before installation, the material is consistent with the design. 2. And before the installation of the internal sand and dust, foreign matter and debris clean up, so as to avoid unsmooth or produce a leak. 3. Before installation, its related piping shall be properly suspended and fixed according to rules to avoid improper stress on the valve after installation. 4. Use flanged pipe: (1) .Pipe flange between the two must be aligned in parallel concentric. (2) Install a gasket between the valve and the flange when installing. 5. After the completion of the device should be re-confirmed fully open and full off. Two. Operation: 1. Before starting the operation, use air spray to clear the foreign objects on the pipe, the inner surface of the pipe to clean with water. 2. The operation of the switch is completely based on the marked direction. 3. To do pressure test pipe, the valve should be opened.