Product Description
Product Description
High precision forging casting bronze axial flow propeller submersible pump propeller Advantages:1. More than 20-year experience in casting and machining line.2. Packed with advanced equipment and ready for your OEM projects.3. Best quality control with kinds of testing machine and rich experienced engineers & inspectors.4. Over 1,000 varieties of products from a 12-year developer.5. Quality system is ISO9001-2008 qualified.6. Competitive price supplied.7. Rich experience in packing, loading and arrangement of shipment.8. One-stop service supplied.9. Surface of Powder coating, Zinc plating, Hot dip galvanizing & E-coating available Questions you may care1) are you a factory or trade company?we are a factory located in Wafangdian of Dalian, specialize in casting and machining.welcome to visit our factory2) how about your qualityall our products are in good quality, before delivery we will check the goods one by one3) what is your payment term?for mold: 50% pay in advance, remaining pay after sample approvalmass products: 30% pay in advance, 70% against copy of bill of lading4) how long you can make your quotation?after receiving detail information we will quote within 3 days.5) what is your quotation element?drawing, material, weight and quantity.,1.SUPPLIER: DALIAN RUICI INDUSTRY CO.,LTDCompanymanufacturer (more than 20 years' experienced factory)exporter (export from 2005 year)Main export marker• Eastern Europe• Western Europe• North America• Mid East Africa• Central/South America• Asia• Australialong-term cooperated customer:Italy,Germany,Spain,Australia etc.Company advantage• Guarantee/warranty• Product feature• Product performance• Prompt delivery• Quality approval• Service• Small order accepted 2.custom service1).Quality guarantee • Chemical checking • NDE after rough machining • Mechanical testing after heat treatment • Final NDE,dimension inspected 2).Quality document• Full Q.A document as per client request3).Packing and Shipping• standard export package(carton/wooden case/pallet)• accept FOB,FAS,CNF,CIF door to door etc or customer designated shipping agent 1. Open impeller As its name suggests, an open impeller has vanes that are open on both sides without any protective shroud. As they don’t have any support either side they tend to be weaker, and therefore are typically used in smaller, inexpensive pumps that aren’t operated under significant strain. Whilst they are able to handle a degree of solid content unlike closed impellers, they require a higher NPSH to operate without cavitation, damage and loss of efficiency.2. Semi-open impellerSemi-open impellers have a back-wall shroud that adds mechanical strength to the vanes, whilst remaining open on the other side. They are somewhat of a middle ground between open and closed impellers in terms of efficiency and NPSHr, making them suited to medium sized pumps with a small amount of soft solids. It’s important to note with semi-open impellers that the clearance between the vanes and the pump casing needs to be small, as if too large slippage and recirculation will occur.3. Closed impeller Now you’ve read about the open and semi-open impellers, you can probably guess that a closed impeller has enclosed at the back and front, providing maximum strength. They have a low NPSH required and provide a more efficient flow. However they are a more complicated, expensive design due to their reliance on close-clearance wear rings to reduce axial loads and help maintain efficiency. They are the most popular impeller for large pumps transferring clean liquid as they are prone to clogging when in contact with solids.
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