In the pharmaceutical chemical industry, the valve failure of the metal quick freezing box is relatively common, and then the professional manufacturer of the Wuxi crown metal quick freezing box and everyone think about the specific solution. Valve body leakage When the valve body has blisters or cracks or the valve body is repaired, the valve body leakage may occur. Treatment technique: polishing the suspected crack, and eroding with 4% nitric acid solution, if there is crack, it can be displayed; Excavation treatment is applied to the crack. Stem bending When the valve stem and the mating thread that it is mated are damaged or the stem tip is broken and the stem is bent. The reason may be due to improper operation, excessive force of the switch, failure of the limit device, failure of the over-torque protection; too loose or too tight thread; excessive number of operations and long service life. By improving the operation, the unavailability is too large ; check the limit device and check the over-torque protection device; select the appropriate material, the assembly tolerance meets the requirements; replace the spare parts. Bonnet joint surface leakage The reason for the bonnet joint surface leakage may be that the bolt tightening force is not enough or tightly biased; the gasket does not meet the requirements or the gasket is damaged; the metal quick freezing box joint surface is defective. Metal blasters are recommended to tighten the bolts or make the door flange flanges consistent; replace the gasket; disassemble the sealing surface of the door cover. Valve leakage The phenomenon of internal leakage of the valve may occur: the closure is not strict; the joint surface is damaged; the gap between the valve core and the valve stem is too large, causing the valve core to sag or contact poorly; the sealing material is poor or the valve core is stuck. It is recommended to improve the operation, re-open or close; the valve disintegrates, the valve core and the valve seat sealing surface are re-ground; adjust the valve core to the valve stem clearance or replace the valve flap; the valve disintegrates to eliminate the jam; re-replace or weld the sealing ring. The spool is disengaged from the valve stem When the spool is disengaged from the valve stem, it is easy to cause the switch to malfunction. The reason for the metal quick freezing box includes improper repair; the joint between the valve core and the valve stem is corroded; the excessive force of the switch causes damage to the joint between the valve core and the valve stem; the spool retaining gasket is loose and the joint is worn. Pay attention to inspection during maintenance; replace the door rod with corrosion-resistant material; the operation is not strong switch, or the valve can not be opened after full opening; check and replace the damaged spare parts. Spool and valve seat have cracks The valve core and the valve seat have cracks. The reason may be that the joint surface welding quality is poor; the temperature difference between the two sides of the valve is large. It is recommended to repair the cracked part, heat-treat according to the regulations, and light and grind. Metal blasters These valve components are relatively simple, so you can learn more about these valves about metal blasters.
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