PVC (Polyvinylchlorid), is PVC, in addition to other ingredients to enhance its heat resistance, toughness, ductility and so on. The top layer of this surface film is a lacquer, with the main component in the center being PVC and the bottom layer being a back-coated adhesive. Advantages of PVC 1  With good tensile strength, compressive strength: but its flexibility is not as good as other plastic pipe.  2. Fluid resistance is small: PVC-U pipe wall is very smooth, the fluid resistance is very small, the coefficient of roughness of only 0.009, its water delivery capacity than the same diameter cast iron pipe increased by 20%, 40% higher than the concrete pipe %. 3. Corrosion resistance, excellent chemical resistance: PVC-U pipe has excellent acid and alkali resistance, corrosion resistance, moisture and soil moisture from the impact of pH, the laying of the pipeline without any preservative treatment. 4. With a good water tightness: PVC-U pipe installation, regardless of the use of rubber or rubber ring connection, have good water tightness.  5. Anti-bite: PVC-U tube is not a source of nutrients, so will not be rodent erosion. According to tests conducted by the National Sanitation Foundation in Michigan, rats do not bite PVC-U tubing. PE is polyethylene plastic, the most basic kind of plastic. Features of PE 1. Good health performance: PE pipe processing does not add heavy metal salt stabilizer, non-toxic material, no scaling layer, does not breed bacteria, a good solution to the secondary pollution of urban drinking water. 2. Excellent corrosion resistance: In addition to a few strong oxidants, resistant to a variety of chemical media erosion; no electrochemical corrosion. 3. Long life: Under rated temperature and pressure conditions, PE pipe can be safely used for more than 50 years. 4. Good impact resistance: PE pipe toughness, high impact strength, heavy objects directly over the pipeline, will not lead to pipe rupture.  5. Reliable connection performance: PE pipe hot melt or fused interface strength higher than the pipe body, the seam will not be due to soil movement or live load disconnect.  6. Good construction performance: light pipe, welding process is simple, convenient construction, low overall project cost. 

The purpose of the straightening process is to eliminate the bending of the steel pipe during rolling, conveying, cooling and heat treatment, and to reduce the ovality of the steel pipe in the other place. Straightening effect is mainly through the regulation of the middle roller, resulting in the longitudinal bending of steel pipe, while each pair of straightening rollers also exert a certain pressure on the pipe, the pipe cross-section repeated elliptical deformation.   This elliptical deformation and bending deformation superimposed, prompting the steel tube in the deformation process of the body axis of the tensile plastic deformation zone. During the straightening process, each cross section of the steel pipe is bent in a reciprocating manner in the plastic zone for several times in a row and at the same time the bending deformation is gradually reduced to achieve the effect that the steel pipe is straightened.

Tubular commonly used button is divided into three types are EU, NU and New Vam. These three types of buckle can be found in the tool shop, EU and NU alone from the buckle appearance is very difficult to distinguish, are triangular buckle, but from the entire string can be easily distinguished, that is EU said the outer thick NU means no outer thickening. New Vam is actually a trapezoidal buckle (buckle rectangular cross section), but also without thickened, so it is also very easy to distinguish. 1) EU (External upset) thickened outside EU deduction is a thick tube type deduction. In the workshop on the understanding of the variable buckle adapter will find three EU-related biano logo. The External Upset End (EUE) indicates the outer thickened end, the External Upset Pin (EUP) indicates the outer thickened buckle, and the External Upset Box (EUB) indicates the outer thickened buckle. 2) NU (Non-upset) No outer thickening NU means that there is no thick hose connector. In addition there is no outer thickening and EU generally there is a difference between the NU generally 10 buckles per inch, EU generally 8 buckles per inch. Where NUE means non-thickened end or end non-thickened. 3) New VAM This buckle is characterized by buckling cross-section is basically rectangular, pitch equal intervals, taper is not large, no outer thick. See at the end of the shop's production sleeve.

Outer wall anti-corrosion of spiral tube is divided into three categories, namely: single-layer PE and 2PE / 3PE anti-corrosion, the following spiral pipe manufacturers to do one by one for your introduction:   1, Single PE anti-corrosion steel pipe Single-layer PE anti-corrosion steel pipe is the use of shower coating process (also known as the curtain method), the intermediate frequency heated steel pipe rotation, the top of the steel pipe is filled with polyethylene powder container, by pouring the surface of steel pipe coated with polyethylene coating Floor. Implementation of the standard CJ / T120-2008 water supply plastic composite pipe.   2, 2PE anti-corrosion steel pipe Pipeline two PE preservative structure, the first layer of adhesive (AD), the second layer of polyethylene (PE), two kinds of material integration, the thickness of each layer with the same three PE: SY / T0413-2002 buried steel pipeline polyethylene coating technical standards GB / T23257-2009 Buried steel pipe polyethylene coating technical standards.   3, 3PE anti-corrosion Pipe three PE preservative structure: the first layer of epoxy powder (FBE> 100um), the second layer of adhesive (AD) 170 ~ 250um, the third layer of polyethylene (PE) 2.5 ~ 3.7mm. Three materials into one, and firmly with the steel pipe to form a good coating. Diameter range Φ60 ~ Φ1420.

Spiral steel pipe is the strip or coil by spiral bending forming, with double-sided submerged arc welding of internal and external seam welded spiral steel pipe, which can be widely used in water, electricity, chemical other industries in the production. 1) As long as the forming angle is changed, it is possible to produce steel pipes of various diameters with the same width of strip steel, which is easy to adjust. 2) Because it is a continuous bending shape, the length of the coil length is not limited, the length can be arbitrarily set. 3) Spiral weld evenly distributed throughout the spiral pipe circumference, so the spiral pipe size and high precision, strength is also strong. 4) Easy to change the size, suitable for small batch, multi-species spiral tube production.