Gear pump gear pumps in all belong to the more excellent quality and have a special range of applications. However, stainless steel pumps also have some unexpected malfunctions at work, such as downtime. We need to analyze the main reasons for downtime, so as to avoid unnecessary damage to the machine in the future. Downtime is mainly caused by the failure of the mechanical seal. The failure of the performance of most of the leaks, leaks for the following reasons: ①static and dynamic ring seal surface leakage, mainly due to: face flatness, roughness does not meet the requirements, or scratches the surface; between the end of the particulate matter, resulting in both ends can not be the same run; installation is not in place, the way is not correct. ② compensation ring seal leakage, mainly due to: gland deformation, uneven pre-tightening; installation is not correct; seal quality does not meet the standards; seal selection wrong. Gear pump stop running after the request: ①transport easy to crystallize, easy to coagulate, easy precipitation and other media pump, stop the pump to prevent clogging, and timely flush with water or other media pumps and pipes. ② high-temperature pump should be stopped according to the provisions of technical documents, after parking should be partial 20 -30 30min half a turn until the pump temperature dropped to 50 ℃ so far. ③ cryogenic pump parking, when no special requirements, the pump should always be filled with liquid; suction valve and the discharge valve should be kept normally open state; the use of double-end mechanical seal of the cryogenic pump, liquid level controller and seal the liquid seal chamber The pump grouting pressure should be maintained. ④ Centrifugal pump should stop running after the pump population valve, to be cooled and then turn off the auxiliary system valves. Exhaust the liquid stored in the pump to prevent corrosion and cracking. A polycarbonate composition excellent in both antistatic property and coloring matter coatability containing (a) a polycarbonate obtained by an ester exchange process, and (b) a compound having a molecular weight of from 300 to 8,000 and having any of ester bond, carbonate bond, amide bond and urethane bond in its molecule and an aromatic hydrocarbon group substituted by at least one alkyl group at the molecular end thereof, a write once read many optical disc substrate and a write once read many optical disc using the same and a process for the production of a write once read many optical disc are described. Bisphenol S Powder,Solidify Plastic Products,Producers Use Reinforcing Substances,Make Plastic Soft And Flexible Jiangxi Hongjiu New Material Technology Co.,Ltd. , https://www.hongjiutech.com
Editor: Buddhist niche