What is the valve flange standard?

What is the steel valve flange standard?

Flange standard parts with the introduction of equipment into China, especially the introduction of large petrochemical equipment and large thermal power generation equipment and nuclear power plant equipment, the original machinery industry standardhas been unable to meet the needs of the industrial development, in the 1990sseries standard, after revised, become the current used "steel pipe flange, gaskets, fasteners" series standard. The characteristics of this set of standards are: the European system and the American system are divided into two categories, respectively formulated the corresponding flange size, technical conditions, pressure-temperature grade, welded joints and groove sizes, as well as the use of spacers, fasteners standards.

Then the petrochemical industry standard appeared, its characteristic is: the outer diameter of the steel pipe; flange size and pressure grade is a single American system; including the content of large diameter flange. Compared with the national standards and chemical industry standards, the petrochemical industry standards have fewer flange types and a single system. Common flange size (Figure 1-1~ Figure 1-6).

Figure 1-1 plane (FF) integral steel pipe flange

Figure 1-2 protrusion surface (RF) integral steel pipe flange

Figure 1-3 concave and convex surface (MF), integral steel pipe flange

Figure 1-4 Tensurface (TG) integral steel pipe flange

Figure 1-5 O-ring surface (OSG) integral steel pipe flange

Figure 1-6, ring surface (RJ) integral steel pipe flange

PN2.5 Overall steel pipe flange dimensions are shown in Table 1-1

Table 1-1 PN2.5 Size of integral steel pipe flange