Before the stainless steel ball valve is degreasing, it should be ground to pass the pressure test, and then disassembled into parts, soaked in the solvent of a closed container for 1 to 1.5 hours (after the safety valve is degreasing, the constant pressure should be re-adjusted), and the suspension should be taken out and dried in a ventilated place; metal stainless steel Threaded pipe fittings, metal gaskets, bolts, nuts, etc. can be degreased in the same way.
Non-metallic gaskets and fillers can be soaked in the solvent for 15-20 minutes, and then hung in a ventilated place to blow dry until there is no solvent odor.
Pure asbestos fillers that are in contact with strong oxidizing media such as oxygen and concentrated nitric acid can be burned at a temperature below 300°C for 2 to 3 minutes, and then coated with the coating required by the design (such as graphite powder, etc.).
After the red copper gasket is annealed, if it is not contaminated by grease, it can no longer be degreased.
The stainless steel ball valves and porcelain rings used in the concentrated nitric acid device can be washed or soaked with 93% concentrated nitric acid, then rinsed with clean water, and then flushed with steam until the steam condensate does not contain acid.
