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  • 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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  • Ventile

    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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  • Gussmaterialien von Ventilen

    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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  • Alte und neue DIN-Bezeichnungen

    Alte und neue DIN-Bezeichnungen Im Laufe der Jahre wurden viele DIN-Normen in die ISO-Normen und damit auch in die EN-Normen integriert. Im Zuge der Überarbeitung der europäischen Normen wurden mehrere DIN-Normen zurückgezogen und durch DIN ISO EN und DIN EN ersetzt. Die verwendeten Standards...
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  • Einführung in Ventilstellantriebe

    Einführung in Ventilbetätiger Ventilbetätiger Ventilbetätiger werden auf der Grundlage einer Reihe von Faktoren ausgewählt, einschließlich des für den Betrieb des Ventils erforderlichen Drehmoments und der Notwendigkeit einer automatischen Betätigung. Zu den Arten von Stellantrieben gehören manuelles Handrad, manueller Hebel, Elektromotor, Pneumatik, Solenoid, Hydra ...
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  • Allgemeine Kennzeichnungsnormen und Anforderungen für Ventile, Fittings, Flansche

    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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  • Anzugsmoment für Flansch

    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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  • Flansche, Dichtungen und Schrauben

    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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  • Flanschflächenausführung

    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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  • Flanschflächen

    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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  • Arten von Flanschen

    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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  • Druckklassen von Flanschen

    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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