The cap is a pipe fitting installed on the external thread of the pipe end to cover the pipe. It is used for sealing the pipe, which has the same effect as the plug, but the cap can be directly screwed on the pipe, generally used at the sampling opening of the pipe end. The cap includes the design of convex cap, conical shell, reducing section, flat cover and tightening orifice. In special cases, after unscrewing the cap, the pipe can be connected with the wire mouth for temporary continuous discharging or discharging. The cap is generally easy to be removed for maintenance under low pressure. The following is about the molding method of cap:

ASME B16.9 A234 WPB SCH80 pipe caps finished by Haihao Group

1.pressure: the end of the pipe or part of the forging machine will be punching, so that the outer diameter is reduced, commonly used forging machine has rotary, connecting rod type, roller type.

2.curved forming method: there are three methods more commonly used, a method called stretch method, another method called stamping method, the third roller method, there are 3-4 rollers, two fixed rollers, an adjustment roller, adjust the distance of the fixed roller, finished pipe fitting is bent.

3.expansion method: one is to place rubber in the pipe, the upper part of the punch compression, so that the tube convex shape; Another method is called hydraulic bulging, in which a liquid is filled in the middle of the pipe. The liquid pressure pushes the pipe into the desired shape

4.rolling method: generally no mandrel, suitable for the inner edge of the thick wall pipe put a core in the pipe and use a roller to push and press the outer edge for the circular edge processing.

Haihao Group specializes in the production of various materials and sizes of the cap, but also according to the customer’s drawings for processing. If you have these requirements, please contact us.Email:sales@haihaogroup.com