Summary:The opening and closing part of the gate valve is a gate. The movement direction of the gate is perpendicular to the dir...
China VALVES Manufacturers
and
.Founded in 2006, the enterprise has established ISO9001 quality system to support the quality guideline: supported by Technology, Meticulously Researching, Professionally Manufacturing and Permanently Creating New Records. The first class production equipments and advanced manufacturing skills are introduced at the same time, involving KRAUSS-MAFFEL CPVC pipe production line and Haitian CPVC Plastic Molding Machine of 2800 tons. In order to ensure the quality of
, the raw materials like CPVC and PVDF are wholly imported from Noveon (USA) and Atofina (France).
Ningbo Baodi Plastic Valve Co., Ltd. is professionaland VALVES suppliers .Founded in 2006, the enterprise has established ISO9001 quality system to support the quality guideline: supported by Technology, Meticulously Researching, Professionally Manufacturing and Permanently Creating New Records. The first class production equipments and advanced manufacturing skills are introduced at the same time, involving KRAUSS-MAFFEL CPVC pipe production line and Haitian CPVC Plastic Molding Machine of 2800 tons. In order to ensure the quality of wholesale VALVES , the raw materials like CPVC and PVDF are wholly imported from Noveon (USA) and Atofina (France).
The opening and closing part of the gate valve is a gate. 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. There are also many types of gate valves. According to the material, it can be classified into cast iron gate valve, cast steel gate valve, stainless steel gate valve, etc. According to the transmission mode, it can be divided into manual gate valve, electric gate valve, pneumatic gate valve and so on. According to the connection mode, it can be divided into flange gate valve, welded gate valve and so on.Flange gate valve has the following advantages:1. The fluid resistance is small, and the sealing surface is less brushed and corroded by the medium.2. It saves effort to open and close.3, the flow direction of the medium is not restricted, does not disturb the flow, and does not reduce the pressure.4. Simple shape, short structure length, good manufacturing technology and wide application range.The disadvantages of flange gate valve are as follows:1. It is easy to cause erosion and scratches between the sealing surfaces, and it is difficult to maintain.2. The size is large, it needs a certain amount of space to open, and it takes a long time to open and close.3. The structure is more complicated.Flange gate valve installation and maintenance should pay attention to the following matters:1. Handwheels, handles and transmission mechanisms are not allowed to be used for lifting, and collisions are strictly prohibited.2, the double gate valve should be installed vertically (that is, the valve stem is in the vertical position, and the handwheel is on the top).3. The gate valve with a bypass valve should be opened before opening (to balance the pressure difference between the inlet and outlet and reduce the opening force).4. The gate valve with drive mechanism should be installed according to the product manual.5. If the valve is frequently opened and closed, lubricate at least once a month
Flanges are manufactured using three main techniques: casting, cutting from rolled plate material, or forging. No matter the technique, the basic flange production includes processing raw materials, then forming them to the appropriate specifications. Flanges are finished to meet the applicable standards for fit and seal, then flanges are packaged and shipped to the customer. Here, we explain the three most common flange manufacturing techniques and compare the pros and cons of each method.
The flange manufacturing process begins with top-quality raw materials from various sources which may fall under several classifications, such as Domestic, Buy America, or Imported. Raw materials may be domestically produced or sourced from countries including China, India, and South Korea.
These raw materials undergo a rigorous testing and approval process prior to purchase by the manufacturer. The resulting Mill Test Report (MTR) declares the chemical and physical properties and verifies that the materials meet the minimum requirements set forth by the applicable standards. The manufacturer refers to the MTR produced during testing to verify quality before manufacturing begins.
The most common raw materials used in flange production are:
Flanges are manufactured by shaping, then machining, drilling, and finishing to the proper specifications. There are a variety of ways flanges are made, including cast, cut, and forged manufacturing methods.
The cast manufacturing method begins with molten metal that’s poured into a mold to form the desired shape—in this case, a flange. After the liquid metal has hardened, the mold is opened and the casting is removed, then machined to the necessary dimensions and surface finish. Flanges produced by casting cost less to produce, and there is less waste involved in the manufacturing process. However, there may be more defects than forged flanges due to the less compact internal structure. As a result, cast flanges may be more prone to failure in high pressure or temperature applications.
The cut flange (or plate flange) manufacturing process begins by flattening steel metal stock using rollers to thin the material until it reaches the intended plate thickness. Then, the flange is cut to the appropriate Outer Diameter (OD) and Inner Diameter (ID) (except blind flanges which have no center bore and do not require an ID) using a torch, laser, or water jet.
Bolt holes and necessary serrations are cut, and the flange is further machined to exact specifications. Flanges produced using the cut manufacturing method offer a lower production cost, but more scrap materials waste. Cut flanges are typically not as strong as flanges produced using other manufacturing techniques.
Forged flanges are manufactured by heating steel billets, slabs, or other metal stock, then compressing the material using a power hammer, press, or die to shape the flange from a solid state. This process develops a continuous grain flow for improved strength. After the flange is forged, it is machined and finished to the appropriate specifications. Forged flanges are often more resistant to wear, but the production cost is greater.
Each flange production technique has pros and cons. When choosing flanges, opt for products that have been manufactured to meet the specifications of the intended application. This includes temperature-pressure ratings as well as the chemical composition and final dimensions of the flange. How flanges are made may affect some or all of these requirements, so consider each manufacturing method’s advantages and disadvantages.
CastPlate/CutForgedCostBetterBestGoodStrengthBetterGoodBestTolerancesBestBetterGoodLimiting Material WasteBetterGoodBestVariety of Material & SizesBestGoodBetterThe flange finish—the roughness or smoothness as well as type of serrations—is completed after the flange is cast, forged, or cut. Flange finish requirements vary based on the selected standard and application. Flange finish options include continuous and concentric serrated, smooth, mill or rolled, and machined finish. We offer modifications to stock items and custom machining so you can get the exact product you need for every application. Protective coatings are applied prior to packaging and shipment.
Flange production techniques, including cast, cut, or forged, can affect the overall performance of the flange. To determine the appropriate technique, consider your intended application and refer to any relevant piping standards. For more information about flange types, materials, and requirements, browse our Resource Center or contact one of our sales staff to discuss.
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