Cast iron is generally used for low pressure. No welding, sealed by raw material belt and wire. 0 ~ 1.6 MPa

Carbon steel and low carbon steel are welded joints. There is no problem with medium and low pressure. 1~ 16mpa is no problem. Medium-high carbon steel has not been used, so it is not easy to weld.

Special requirements are stainless steel or copper.

There are 37-degree cones and 74-degree cones in the United States, and both of them have fine teeth.