The Media In Chemical Production Facilities Mostly Have The Characteristics Of High Toxicity, Flammability, Explosiveness, And Strong Corrosiveness. The Working Conditions Are Complex And Harsh, And The Operating Temperature And Pressure Are High. Once The Valve Fails, It Can Cause Medium Leakage In Mild Cases, Shutdown In Severe Cases, And Even Cause Serious Accidents. Therefore, Scientifically And Reasonably Selecting Valves Can Not Only Reduce The Construction Cost Of The Device, But Also Ensure The Safe Operation Of Production

Key Points For Valve Selection

1. Clarify The Purpose Of The Valve In Equipment Or Devices

Determine The Working Conditions Of The Valve, Including The Properties Of The Applicable Medium, Working Pressure, Working Temperature, And Control Mode.

2. Correct Selection Of Valve Type

The Correct Selection Of Valve Type Is Based On The Designer's Full Understanding Of The Entire Production Process And Operating Conditions. When Selecting Valve Types, Designers Should First Grasp The Structural Characteristics And Performance Of Each Valve.

3. Determine The End Connection Of The Valve

Among Threaded Connections, Flange Connections, And Welded End Connections, The First Two Are The Most Commonly Used.

. Valves With Threaded Connections Are Mainly Those With A Nominal Diameter Of Less Than 50mm. If The Diameter Size Is Too Large, The Installation And Sealing Of The Connection Part Will Be Very Difficult Valves With Flange Connections Are Relatively Easy To Install And Disassemble, But They Are Bulky And Expensive Compared To Valves With Threaded Connections, Making Them Suitable For Connecting Pipelines Of Various Diameters And Pressures Welding Connections Are More Reliable Than Flange Connections Under More Stringent Conditions. However, The Disassembly And Reinstallation Of Welded Valves Are Relatively Difficult, So Their Use Is Limited To Situations Where They Can Operate Reliably For A Long Time Or In Harsh Conditions With High Temperatures

4. Selection Of Valve Materials

When Selecting The Material Of The Valve Shell, Internal Components, And Sealing Surface, In Addition To Considering The Physical Properties (temperature, Pressure) And Chemical Properties (corrosiveness) Of The Working Medium, The Cleanliness Of The Medium (whether There Are Solid Particles) Should Also Be Mastered. In Addition, Relevant Regulations Of The Country And The Using Department Should Be Referred To.

The Correct And Reasonable Selection Of Valve Materials Can Achieve The Most Economical Service Life And Optimal Performance Of The Valve. The Selection Order Of Valve Body Materials Is: Cast Iron Carbon Steel Stainless Steel, And The Selection Order Of Sealing Ring Materials Is: Rubber Copper Alloy Steel-F4