Working condition adaptation and maintenance optimization: Detailed adjustments for high-voltage scenarios
High-pressure steam scenarios (DN50-DN300) : The sealing surfaces of the valve body and gate plate are surfacing with 13Cr alloy, which can withstand the scouring of high-pressure steam at 2.5MPa and 425℃. The handwheel heat insulation sleeve has been thickened to 10mm (8mm for Z41H-16C), providing better heat resistance. The diameter of the drainage hole has been increased to DN25 (DN20 for Z41H-16C), facilitating the rapid discharge of high-pressure condensate water and preventing water accumulation and rusting at the bottom of the gate plate. ​
High-pressure oil product scenarios (DN100-DN600) : The inner wall of the valve body is coated with "sandblasting rust removal epoxy resin coating (80μm thick)", which is 30% thicker than the coating of Z41H-16C, enhancing the resistance to residual oil corrosion. The packing material is selected as oil-resistant flexible graphite (with polytetrafluoroethylene fiber added) to prevent high-pressure oil from dissolving the packing material. The oil level observation window of the manual transmission box has been upgraded to tempered glass, with its pressure resistance increased to 3MPa, meeting the safety requirements of high-pressure workshops. ​
Maintenance convenience: The bolts between the valve body and the valve cover have been upgraded to 10.9 grade high-strength bolts, with the number increasing by 2 to 4 compared to Z41H-16C, ensuring safe disassembly under high pressure. The sealing surface can still be ground and repaired after wear, but the grinding accuracy requirement is higher (the surface roughness needs to be restored to Ra≤0.8μm). After repair, the sealing performance can be restored to 90% of that of a new valve. Although the maintenance cost is 15% higher than that of Z41H-16C, the service life is extended by 20%, which is suitable for the long-term operation requirements of high-pressure scenarios.