The classification method of elbows, based on their radius of curvature, can be divided into long-radius elbows and short-radius elbows. A long-radius elbow refers to one whose radius of curvature is equal to1.5Times the outer diameter of the pipe, that isR＝1.5D. Short-radius elbows refer to those whose radius of curvature is equal to the outer diameter of the pipe, that isR＝D. In the formulaDIs the diameter of the elbowRIt is the radius of curvature. If classified by pressure rating, there are approximately seventeen types, which are the same as the pipe standards in the United States, including:Sch5s,Sch10s,Sch10,Sch20,Sch30,Sch40s,STD,Sch40,Sch60,Sch80s,XS;Sch80,Sch100,Sch120,Sch140,Sch160,XXSAmong them, the most commonly used one isSTDandXSTwo kinds. According to the Angle of the elbow, there is45oElbow, yes90oElbows and180oElbow. In this way, there are many types of elbows. When placing an order, the order is often expressed in the following way: for example"LRSTD90o8"It represents the long radius and the pressure level isSTD,90othe8"Elbow For example,"SRXS45o4"Represents the short radius, and the pressure level isXS,45othe4"Elbow. The above is a general classification of elbows.

Elbow

There are generally two types of three-way connectors. A three-way valve with three equal diameters is called an equal-diameter tee. A three-way valve with the same diameters at both ends but a different diameter at the confluence end from the other two is called a different-diameter tee. The representation method is as follows: For an equal-diameter tee, for example"T3"The three-way rule indicates that the outer diameter is3An inch equal-diameter tee. For a reducer tee, for example"T4×4×3.5"It indicates that the same diameter is four inches and the opposite diameter is3.5An inch reducer tee. The pressure rating and that of the elbow are the same, and their specification ranges are also the same.

The big and small heads are also classified in this way. The representation method of the large and small heads is the diameter of the large head multiplied by the diameter of the small head, for example"8×6"It indicates that the diameter of the large end is8Inches. The diameter of the small head is6The size of the head is inches.