The external wire elbow is a kind of connecting pipe fittings commonly used in plumbing installation. The screw mouth is at the outer side, opposite to the inner wire elbow. In the pipeline system used in all pipe fittings, the proportion of about 80%. Usually, the elbow of different material or wall thickness choose different forming process. At present, manufacturers commonly used seamless elbow forming process has hot push, stamping, extrusion and so on.
Plumbing installation commonly used in a steering connection with the end pipe. According to the angle, there are 45 ° and 90 °, in addition to engineering needs also include 60 ° and other abnormal angle elbow. The materials of the wire elbow are cast iron, stainless steel, alloy steel, cast iron can be calcined, carbon steel, non-ferrous metals and plastics.
Are the elbows sewn and seamless?
The elbow has two kinds of seam and seamless. The main difference in raw materials, seamless elbow is made of seamless pipe push, there is a seam elbow refers to the welding elbow, straight seam elbow.
The difference between the welding elbow and the seamless elbow is that there are two welds in the ed elbow, the straight seam elbow has a day weld, and the welded seam elbow is not welded. Seamless elbow has the following advantages: non-toxic health, light weight, good heat resistance, corrosion resistance to heating, good insulation, good performance of anti-impact performance, long service life.
- Sanitary and non-toxic: The material is completely composed of carbon and hydrogen, without adding any toxic heavy metal salt stabilizer. The hygienic performance of the material has been tested by the national authoritative department.
2, light weight: stamping elbow density of 0.89-0.91g / cm, only 10% of steel pipe. Because of its light weight, the utility model can greatly reduce the transportation cost and the construction intensity of the installation. - Good heat resistance to heating: when the working temperature is 70 degrees, the softening temperature is 140 degrees.
4, good corrosion resistance: in addition to a few hydrogenation agent, can withstand a variety of chemical media erosion, with excellent acid, alkali, corrosion resistance, no rust, no corrosion, no bacteria, no electrochemical corrosion.
5, good insulation: due to the low thermal conductivity of the material, 20 degrees Celsius thermal conductivity coefficient of 0.21-0.24 W / mk, Much smaller than steel pipe (43-52W / mk), purple pipe (333W / mK), so PP-R pipe insulation is good.
6, high impact: due to the unique impact strength performance than other solid wall tube has been significantly improved, the ring stiffness equivalent to 1.3 times the solid wall.
7, long service life: pipe in rated temperature and pressure, service life of more than 50 years, with anti-ultraviolet, anti-radiation, so that the product will never fade.
What is the difference between a long radius elbow and a short radius elbow? - Different definitions
Long Radius Elbow: The long radius elbow refers to the radius of curvature of the elbow is 1.5 times the diameter of the pipe; If more than 1.5 times, is the scope of the elbow.
Short Radius Elbow: short radius elbow refers to the radius of curvature of the elbow is equal to the diameter of the pipe, which is often said 1 times.
2, different applications
Long radius elbow is the most commonly used, general default is long radius, high pressure or high flow rate places will use long radius if it is a solid pipeline resistance requirements to use a larger radius elbow. Short radius is generally used in low pressure fluid or where elbows are limited. If there are no conditions or not specified in the contract preferred long radius elbow. - Different implementation standards
Long radius elbows:
National standard GB / T12459-2017
National standard GB / T13401-2005
National standard GB / T 10752-1995
Chemical standard HGJ 514-87
Power standard DL / T695-1999
Electrical Standard D-GD87-0219
Short radius elbows:
GB/T12459-2017
GB/T13401-2017
GB/T10752-1995
SH3408-1996
SH3409-1996