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11-07 

Introduction to the distinction between rising stem gate valve and dark stem gate valve

Weituo Weituo Fluid Equipment WATO Wuhan Weituo Fluid Control Equipment Co., Ltd. The gate valve is a gate for opening and closing parts. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve is sealed by the contact between the valve seat and the gate plate, and the sealing surface is usually welded with metal materials to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc.

07-01 

How to avoid butterfly valve failure during use

Weituo Weituo Fluid Equipment WATO Wuhan Weituo Fluid Control Equipment Co., Ltd. The butterfly valve is a widely used valve. It originated in the 1930s. The butterfly valve is a 90-degree switch or a valve that regulates flow. Due to its simple structure, small size, light weight, and simple operation, the butterfly valve is It can be applied in many working conditions. Butterfly valve connection methods include flange connection, wafer connection, welding connection, etc. Different materials can also be selected according to different working conditions. The butterfly valve can be made of cast iron, cast steel, stainless steel, etc. Of course, it is inevitable that there will be malfunctions during use, so how should we try to avoid malfunctions in the use of butterfly valves? Let's take a look together.

07-01 

What are the characteristics of the wide application of ball valves?

Weituo Weituo Fluid Equipment WATO Wuhan Weituo Fluid Control Equipment Co., Ltd. ball valve is a new type of valve that came out in the 1950s. In just over 30 years, it is one of the valve varieties that have developed rapidly in the past ten years. In the pipeline, it is mainly used to cut off, distribute and change the flow direction of the medium. The ball valve designed as a V-shaped opening also has a good flow adjustment function. The ball valve can be closed tightly

10-30 

Introduction to the protection of valve corrosion

WeituoWeituoFluidEquipmentWATOWuhanWeituoFluidControlEquipmentCo.,Ltd.Valveisacontrolcomponentinafluidconveyingsystem.Ithasthefunctionsofcut-off,regulation,diversion,preventionofreverseflow,stabilization,diversionoroverflowandpressurerelief.Valvesusedinfluidcontrolsystems,rangingfromthesimplestshut-offvalvestothevariousvalvesusedinextremelycomplexautomaticcontrolsystems,haveawiderangeofvarietiesandspecifications.Thecorrosionofthevalveisusuallyunderstoodasthedamagetothemetalmaterialofthevalveundertheactionofachemicalorelectrochemicalenvironment.Sincethe"corrosion"phenomenonoccursinthespontaneousinteractionbetweenthemetalandthesurroundingenvironment,howtoisolatethemetalfromthesurroundingenvironmentorusemorenon-metallicsyntheticmaterialsisthefocusofcorrosionprevention.Thevalvebodyincludesthevalvecover,whichoccupiesmostoftheweightofthevalveandisinconstantcontactwiththemedium.Therefore,theselectionofthevalveisoftenbasedonthevalvebodymaterial.Theanti-corrosionofthevalvebodyismainlybasedonthecorrectselectionofmaterials.Althoughthereareabundantanti-corrosionmaterials,itisnoteasytochoosetherightone,becausetheproblemofcorrosionisverycomplicated.Forexample,sulfuricacidisverycorrosivetosteelwhentheconcentrationislow,andwhentheconcentrationishigh,thesteelisproduced.Passivationfilmcanpreventcorrosion;hydrogenonlyshowsstrongcorrosivenesstosteelunderhightemperatureandhighpressure.Whenchlorineisinadrystate,thecorrosionperformanceisnotgreat,butwhenthereisacertainhumidity,thecorrosionperformanceisverystrong,andmanymaterialscannotbeused..Thedifficultyinselectingvalvebodymaterialsliesinnotonlyconsideringcorrosionissues,butalsofactorssuchaspressureresistanceandtemperatureresistance,whetheritiseconomicallyreasonable,andwhetheritiseasytopurchase.Soitmustbeattentive.Therearetwoformsofcorrosionofthevalvebody,namelychemicalcorrosionandelectrochemicalcorrosion.Itscorrosionratedependsonthetemperature,pressure,chemicalpropertiesofthemediumandthecorrosionresistanceofthevalvebodymaterial.Thecorrosionratecanbedividedintosixlevels:1.Completecorrosionresistance:thecorrosionrateislessthan0.001mm/year;2.Extremelyresistanttocorrosion:thecorrosionrateis0.001to0.01mm/year;3,corrosionresistance:corrosionrate0.01to0.1mm/year;4.Stillcorrosionresistant:thecorrosionrateis0.1to1.0mm/year;5.Poorcorrosionresistance:thecorrosionrateis1.0to10mm/year;6.Notcorrosionresistant:thecorrosionrateisgreaterthan10mm/year.Thesecondistotakeliningmeasures,suchaslininglead,liningaluminum,liningengineeringplastics,liningnaturalrubberandvarioussyntheticrubbers.Ifthemediaconditionspermit,thisisaneconomicalmethod.Furthermore,inthecaseoflowpressureandtemperature,usingnon-metalasthevalvebodymaterialcanoftenbeveryeffectiveinpreventingcorrosion.Theoutersurfaceofthevalvebodyisalsocorrodedbytheatmosphere,andgenerallysteelmaterialsareprotectedbypainting.

10-30 

Factor considerations of butterfly valve instead of gate valve

In recent years, gate valve as a tool to control water volume and direction of water flow, its form has also changed. In the past, the commonly used dual-use flashlight gate valve was gradually replaced by dual-use flashlight butterfly valves. The advantages of butterfly valves are small size, light weight, easy installation, and small resistance coefficient. Although the traditional gate valve is not easy to leak water, it is large in size; especially the gate valve with a large pipe diameter is large and bulky, and it is inconvenient to install and disassemble; more importantly, due to the large size, the area of the pump room increases and the project cost increases. .

Wuhan Weituo Fluid Control Equipment Co., Ltd

Address: Room 1706, Building D, Wuhan Living Room, No.8 Hongtu Avenue, Dongxihu District, Wuhan City

Tel：0086-18942929031 0086-18571829295

Fax：0086-027-83612830

E-mail：watosong@watovalve.com

Address： www.watoer.com www.watovale.cn 伟拓.网址

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