Valves as an important part of the pipeline system, should ensure safe and reliable implementation of the piping system requirements for the use of the valve. Therefore, the valve design must meet all the requirements of the working pressure, temperature, corrosion, fluid characteristics and the operation of the valve, manufacturing, installation, maintenance and other aspects of the valve. Valve design must be clearly given technical data, that is, "design input", on the basis of this design can be completed correctly. Valve "design input" must have the basic data: 1, the purpose or type of valve 2, the working pressure of the medium 3, the working medium of the medium 4, the physical and chemical properties of the medium (corrosive, flammable and explosive, toxic , Etc.) 5, the nominal pass 6, the length of the structure 7, the form of connection with the pipeline 8, the valve operation (manual, gear, worm gear, electric, pneumatic, hydraulic, etc.) 1) Valve flow capacity and fluid resistance coefficient 2, Valve opening and closing speed and the number of opening and closing 3, Drive energy characteristics (AC or DC, voltage, air pressure, etc.) 4, the valve working environment and maintenance conditions (whether explosion-proof, whether tropical climatic conditions, etc.) 5, the size limit 6, the weight limit 7, anti-seismic valve design process: design and development planning 1, design and development phase 2 , Suitable for each design and development phase of the review, verification and validation activities 3, design and development responsibilities and permissions design and development input 1. Function and performance requirements 2. Legal and regulatory requirements used 3. Information previously provided by similar designs 4. Other requirements necessary for design and development Outputs for design and development 1. Requirements for design and development inputs 2. Requirements for procurement , Production and service 3. Contains or refers to product acceptance criteria 4. Provides the product features necessary for the safe and proper use of the product Design and Development Confirmation Confirmation by Product Identification Design and Development Changes -
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