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Company Profile

Hai Wei Machinery Co. Ltd .,is located in China, He bei  province

Company was founded in 1976,covers an area of 15000 square meters .It has a history of more than forty years ,we are a comprehensive enterprise which integrates production and trading of pipe fittings,   Use high-quality stainless steel as raw material ,  our production  mainly includes stainless steel flange .blind flange , Weld neck flange ,elbow. Tee joint. Reducing pipe and so on, And we can make all kinds of special non-standard pipe fittings according to customer’s demand. for example: the lining and  zincification or galvanize. Stainless steel pipe fittings are mainly used in petroleum, chemical, power, shipbuilding, paper, metallurgy, textile, pharmaceutical, food and other industries, Production technology includes forging, forging and press, cold forming, hot extrusion, fine blanking ,forging and fine blanking are the main technologies.

Company has obtained “iso9001-2000 quality system certification”, “environmental management system certification certificate”, “occupational health and safety management system certification certificate”, “American Petroleum Society (api6h) certification certificate”. The company has obtained the “license of manufacture of Special equipment of the people’s Republic of China” (Safety Registration Certificate of pressure Pipeline components, pressure vessel Manufacturing Unit) and the Certificate of members of the material Resources Market of Sinopec issued by the State Administration of quality Supervision, Inspection and Inspection, CNPC Grade 1 supply Network Certificate, Power Station pressure Pipeline Manufacturing qualification Certificate, Energy No.1 Network member Certificate. Perfect quality assurance system and scientific manufacturing technology effectively guarantee the quality of products.


Our distributor of stainless steel flange, Weld neck flange, tee joint , blind flange , elbow, Reducing pipe are sold not only spread all over China, but also have been sold all over the world. The major countries are the United States, Canada, Russia, Indonesia, India, Africa, etc.


What is a flange


Flange is pipe fittings that connect pipes to each other , and used for connection between pipe ends, also used for flanges at the inlet and outlet of the equipment, for the connection between two devices.

Flanges are usually used to connect pipes. When pipes have to be connected to each other that they can be welded together directly, but it’s very laborious and difficult to maintain, and when a connection is needed between a pipe and a valve, it’s just as hard to weld together. And maintenance is inconvenient. Introduction of flange , can easily solve the above problems.

The pipe is welded on the flange first, the valve and other equipment are also equipped with flange, when connecting, the flange and flange are joined together, with flange gasket attached, through flange screw, the two are tightly connected together, convenient and labor-saving. During maintenance, the flange screw can be removed from the flange, the corresponding pipe or valve equipment can be removed, repair or replace the new pipe and valve. There are holes in the flange and the bolt fastens the two flanges. Gasket between flanges. According to the flange connection, the flange can be threaded (threaded) flange, welded flange and clamped flange. Flange is widely used in industry, ship, water supply, chemical industry, construction, water supply, sewerage, oil, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, electric power, spaceflight, shipbuilding and so on. II. Classification of flange

According to chemical (HG) industry standard: integral flange (IF), thread flange (TH), slip on flange (PL), weld neck flange (WN), socket weld flange (SW), lap joint flange( LJ), blind flange (BL) .

What is a tee joint

Tee joint is used mainly to change the direction of the fluid, used in the main pipeline to branch pipe. It can be classified by pipe size. Generally used carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, PVC and other material.


What is a pipe elbow

Pipe elbow is a pipe fittings that changes the direction of the pipe in the pipe system. Points according to the Angle 45 ° and 90 ° 180 ° three kinds of commonly used, according to the requirements of the project also includes 60 °, and other abnormal Angle bend. The material of bend is cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, nonferrous metal and plastic etc. The connection method with pipe includes: direct welding (common way) flange connection, hot fusion connection, electric fusion connection, thread connection and socket connection, etc. According to the production process, it can be divided into: welding elbow, stamping elbow, pushing elbow, casting elbow, butt welding elbow, etc. Other names: 90 degree bend, right Angl

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