Pn stands for nominal pressure, which is the compressive strength of the elbow product at the reference temperature.If the nominal pressure is 2.SMPa, it can be denoted as PN2. 5MPa.Due to the different materials of butt welding elbow, its reference temperature is also different, the reference temperature of cast iron and copper is 120℃, the reference temperature of steel is 200℃, the reference temperature of alloy steel is 250℃.The compressive strength of the product at the reference temperature is close to the compressive strength at room temperature, so the nominal pressure is close to the compressive strength of the material at room temperature.

Ps test pressure is the pressure specification for checking the mechanical strength and strict function of elbow and accessories at room temperature.The pressure test of butt welding elbow and pipe accessories is conducted before leaving the factory to check their strength and tightness. The pressure of strength test on the product is called the strength test pressure, which is indicated by the symbol ps. If the experimental pressure is 4MPa, it is denoted as ps4MPa.From the perspective, the experimental pressure is greater than the nominal pressure, which is generally 1.5 ~ 2 times of the nominal pressure.

The working pressure indicated by Pt refers to the working pressure of the flowing medium in the pipeline.This operating condition refers to a certain operating temperature, so remember that the working pressure of a product should indicate its operating temperature, usually in the lower right corner of the additional number, the number is high operating temperature divided by 10 obtained integer value, such as the high temperature of the medium is 300℃, the working pressure is IOMPa, then recorded as p30IOMPa.Butt welding elbow not only accepts the pressure effect of the medium, but also accepts the temperature effect of the medium.Materials have different mechanical strengths at different temperatures, so the allowable working pressure of the medium varies with the temperature of the medium.

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