Nyheder

Nyheder

  • Company introduction

    Hebei Liyong Flowtech Co., Ltd. is a leading manufacturer and exporter of valves, fittings, flanges, pipes and other piping products. Our company is located in the North China Plain of China, which is rich in resources and rich in industrial heritage. We specialize in the manufacture of a wide ra...
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  • Ventiler

    A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category. In an...
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  • Støbematerialer af ventiler

    Casting Materials of Valves ASTM Casting Materials Material ASTM Casting SPEC Service Carbon Steel ASTM A216 Grade WCB Non-corrosive applications including water, oil and gases at temperatures between -20°F (-30°C) and +800°F (+425°C) Low Temp Carbon Steel ASTM A352 Grade LCB Low temperatu...
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  • Gamle og nye DIN -betegnelser

    Gamle og nye DIN -betegnelser I årenes løb blev mange DIN -standarder integreret i ISO -standarderne og dermed også en del af EN -standarderne. I forbindelse med revisionen af ​​de europæiske standarder blev flere DIN -standarder trukket tilbage og erstattet af DIN ISO EN og DIN EN. De anvendte standarder ...
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  • Introduktion til ventilaktuatorer

    Introduktion til ventilaktuatorer Ventilaktuatorer Ventilaktuatorer vælges baseret på en række faktorer, herunder drejningsmoment, der er nødvendigt for at betjene ventilen, og behovet for automatisk aktivering. Typer af aktuatorer inkluderer manuelt håndhjul, manuel håndtag, elektrisk motor, pneumatisk, solenoide, hydra...
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  • Generiske mærkningsstandarder og -krav til ventiler, fittings, flanger

    Generic Marking Standards and Requirements Component Identification The ASME B31.3 Code requires random examination of materials and components to ensure conformance to listed specifications and standards. B31.3 also requires these materials to be free from defects. Component standards and spec...
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  • Momenttilspænding for flange

    Torque Tightening To obtain a leak-free flange connection, a proper gasket installation is needed, the bolts must be assign on the correct bolt tension, and the total bolt strength must be evenly divided over the whole flange face. With Torque Tightening (the application of preload to a fasten...
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  • Flenger Pakninger & Bolte

    Flanges Gaskets & Bolts Gaskets To realize a leak-free flange connection gaskets are necessary. Gaskets are compressible sheets or rings used to make a fluid-resistant seal between two surfaces. Gaskets are built to operate under extreme temperature and pressures and are available in a wide ...
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  • Flangefladefinish

    Flange Face Finish Flange face finish The ASME B16.5 code requires that the flange face (raised face and flat face) has a specific roughness to ensure that this surface be compatible with the gasket and provide a high quality seal. A serrated finish, either concentric or spiral, is required wi...
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  • Flangeflader

    Flange Faces What is a Flange face? Different types of flange faces are used as the contact surfaces to seat the sealing gasket material. ASME B16.5 and B16.47 define various types of flange facings, including the raised face, the large male and female facings which have identical dimensions to...
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  • Typer af flanger

    Types of Flanges Flange types As already described before, the most used flange types ASME B16.5 are: Welding Neck, Slip On, Socket Weld, Lap Joint, Threaded and Blind flange. Below you will find a short description and definition of each type, completed with an detailed image. Most common flang...
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  • Trykklasser af flanger

    Pressure Classes of Flanges Forged steel flanges ASME B16.5 are made in seven primary Pressure Classes: 150 300 400 600 900 1500 2500 The concept of flange ratings likes clearly. A Class 300 flange can handle more pressure than a Class 150 flange, because a Class 300 flange are co...
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