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Structural Features of Full Welded Ball Valves

Full welded ball valves are widely used in various fields including the urban gas, the urban heat supply, petrochemical engineering, shipbuilding and the power plant. The superior quality and high performance stability of full welded ball valves can not be replaced by the ordinary cast steel ball valves. Full welded ball valves have much longer service lives than cast steel ball valves.   Technical features of full welded ball valves   1. Full welded ball valves have the overall welded structures, which will make the outer leakage not happen.   2. The valve seat of the full welded ball valve […]

2017-09-05 read more...
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The Differences Between Forged Flanges and Cast Flanges

Cast flanges can be manufactured in various kinds of complex shapes which are difficult to be obtained for the flanges which are produced by other manufacturing methods. Cast flanges have very low costs, which make them much cheaper than forged flanges. They have characteristics of the ideal surface’s finish which can be acquired without any surface treatment as well as being able to be easily formed. The shortcoming of cast flanges is that it is easy for them to have defects or that some parts of them are not compact, which makes cast flanges unable to be applied to the […]

2017-09-05 read more...
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Introductions of Cast Iron Pipes

Cast iron pipes are made of casting cast iron, which are applied to water supply, drainage and gas pipelines. Cast iron pipes include cast iron straight pipes and pipe fittings. The cast iron pipe can be divided into the gray cast iron pipe and the ductile iron pipe based on the material. Connection types of cast iron pipes can be classified into flexible connections and flanged connections according to connection modes. Flexible cast iron pipes adopt rubber seals; we use flanges to fix flanged cast iron pipes and rubber flange gaskets to seal flanges.  Cast iron pipes can be divided into gray iron pipes, […]

2017-08-31 read more...
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What are Thread Valves?

A thread valve is the valve with the thread and can be classified into the internal thread valve and the external thread valve. This kind of valve is connected to the pipeline with the threaded connection. The valve, generally, has the small diameter and is used for engineering projects under normal pressures and low pressures. At the same time, under high pressures, the thread valve is required to be operated with the welded connection or the flange connection. Common types of thread valves include thread gate valves, thread ball valves, thread globe valves and thread check valves. The valve body of the thread valve can be […]

2017-08-30 read more...
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Differences between Ordinary Globe Valves and Bellow Seal Globe Valves

A bellow seal valve has a compact structure and is one kind of control valve to balance the pressure. Bellows are used as the valve stem sealing components of the bellow seal valves. To avoid the leakage of the valve stem, the valve adopts the structure with bellows instead of stuffing boxes generally used for the ordinary valve or the structure with both bellows and stuffing boxes.  The bellow seal valve is particularly suitable for pipelines of steam and flammable, explosive and hazardous media. Moreover, because of bellow’s properties of deformation and aging resistance, the bellow seal valve overcomes the common […]

2017-08-30 read more...
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Specifications of Steel Pipe Fittings

The specifications of the pipe fittings mainly involve the diameters and the thicknesses of the tubes’ walls. The nominal dimension or the nominal diameter (the symbol of the metric unit is DN, which is followed by the value in millimeters) is mainly used to indicate the diameter of the pipe fitting. The nominal dimension is a common mark for the pipe’ diameter. In addition, we can also use the outer diameter and the inner diameter in the millimeter to show the nominal dimension. There are many ways can be used to indicate thicknesses of tubes’ walls, such as SCH schedule (SCH, followed by […]

2017-08-30 read more...
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An Simple Introduction to Stamping Elbows (Part Two)

Advantages of large stamping elbows‘ forming processes are mainly manifested in the following aspects. ⑴ Stamping elbows don’t need tube blanks as raw materials, which can not only save money in pipe making equipment and molds, but also obtain any pushing elbow with the large diameter and the relatively thin wall. The raw material of this kind of stamping elbow is special and it is easy to control the material in the manufacturing process of the stamping elbow. ⑵ Tube blanks of stamping elbows are flat plates; therefore, stamping processes are simple; stamping processes can ensure good accuracy of stamping elbows and can make tamping elbows […]

2017-08-30 read more...
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An Simple Introduction to Stamping Elbows (Part One)

Stamping elbows use stamping dies to process the plates which have the identical materials because the pipes in order to form half elbows and the two half elbows are welded to at least one elbow. We often use spot welding to repair semi-finished elbows based on different welding standards of various pipelines welding processes are executed according to amounts of pipelines’ welding seams in construction operation. Applications The elbow is among the pipe fittings which can be popular for pipeline installation the elbow can be used to get in touch two pipes with the same or different nominal diameters, to […]

2017-08-29 read more...
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Precautions concerning the Installation of Valves

Precautions concerning the Installation of Valves A valve is a device which we use to control the direction, pressure and flow of a fluid in a fluid system, which can make the media such as the liquid, the gas and the powder in the pipe or equipment flow or cut off. In the construction process, the installation of the valve will directly affect the normal operation of the valve in the future. Today, we summarize some precautions concerning the installation of the valve. 1. The specifications and models of valves can not meet the design requirements. For example, the nominal pressure of the valve is less than the test pressure of the system. The gate valve is supposed to […]

2017-08-27 read more...
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Selection Principles of Gate Valves

Advantages of gate valves 1. The medium’s flow direction will not be changed because gate valves belong to the through type valve which also makes gate valves feature in small flow resistance. 2. The sealing performance of gate valves is better than that of globe valves, and the opening and closing of the gate valves need less effort than globe valves’. 3. Gate valves have a wide range of applications. In addition to steam, oil and other media, gate valves can also be applied to the media with granular solids or viscosity, used as air release valves or valves for […]

2017-08-27 read more...