□ Implement the national "health code" mutual recognition of foreign personnel, and all implement "red code" control and "green code" release.   □ Completely cancel the negative list for resumption of work and production and the "filing system + n...

Large wall thickness error of pipe circumferential section ①The accuracy of the concentricity between the die and the mandrel in the forming die is poor after assembly, which makes the gap between the two parts of the melt flow channel uneven. The co...

The convenient pressure of new pipes, especially plastic pipes, is related to many factors, such as pipe diameter, pipe wall thickness, service temperature, pipe fitting processing method, pipe fitting and pipe connection method, etc. Among them, the...

1. Formula 1. In order to become chlorinated polyvinyl chloride plastic (PVC-C) hot water pipes and electric power, cable buried pipes, why add chlorinated polyvinyl chloride (CPVC) in different parts? This is because chlorinated polyvinyl chloride (...

As a material with the reputation of "Plastic King", what are the advantages and disadvantages of polytetrafluoroethylene (PTFE)? Let us understand together.   advantage   High temperature resistance-the working temperature can reach 250℃. Low temper...

1. What is the nominal pressure PN (MPa)?  The reference value related to the pressure resistance of piping system components refers to the design given pressure related to the mechanical strength of the piping component.  The nominal pressure is gen...

Valves are pipeline accessories used to open and close pipelines, control flow, adjust and control the parameters (temperature, pressure and flow) of the conveying medium.   Basic terminology 1. Strength performance   The strength performance of the ...

Under normal circumstances, if it is not tightly closed, first confirm whether the valve is closed in place. If it is closed in place, there is still leakage and cannot be sealed, then check the sealing surface. Some valves have detachable seals, so ...

1. Analysis of the causes of cracking of injection molded products Cracking, including filament cracks on the surface of the part, microcracking, whitening, cracking, and damage due to the sticking of the part, the sticking of the flow path, or the t...

1. Analysis of the causes of cracking of injection molded products Cracking, including filamentous cracks, microcracks, whitening, cracking, and trauma crisis caused by the sticking of the workpiece and the runner sticking on the surface of the part,...

NPT is a general-purpose American standard tapered pipe thread with a profile angle of 60°. The PT thread is an inch taper thread with a tooth profile angle of 55°. The most commonly used inch pipe thread in sealing is a fine thread. Because the coa...

PPH tube is β-modified for ordinary PP material, so that it has a uniform and fine β crystal structure, and has excellent chemical resistance, abrasion resistance, high temperature resistance, corrosion resistance, aging resistance and good insulati...