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Highlights at a glance:
1.Casting Stage (Primarily Precision Casting).
Wax Model Making:3D printing or traditional wax modeling is used to ensure dimensional accuracy. Shell Formation:A surface layer of zircon sand or similar material is applied, with mullite sand as the backing layer,forming a high-strength shell. Dewaxing and Firing:The wax model is melted at 120℃,followed by firing at 1150-1175℃ to enhance strength and permeability. Pouring: A curved sprue (e.g., S-shaped) is used to control the flow rate of molten steel, reducing porosity and shrinkage cavities. Cleaning: The sand shell is mechanically broken up to obtain the casting blank.
2. Post-Casting Treatment
Pickling and Passivation: Oxide scale is removed to improve corrosion resistance (especially for stainless steel). Dimensional and Performance Inspection: Dimensional accuracy (up to CT5 grade), sealing performance, and mechanical properties are inspected.
3. Machining Stage
Rough Machining: Initial shaping via turning and milling, retaining allowance for subsequent machining. Stress Relief Treatment: Some high-end processes employ a six-stage process: rough machining ---high-temperature stress relief--- semi-finishing---ow-temperature aging--- finish machining, to prevent deformation. Finish Machining: Focus on machining key areas such as flanges, pipe diameters, and sealing surfaces, completing multi-face machining in a single setup to ensure parallelism ≤0.003mm. Sealing Surface Welding (Hard-Seal Valves): Welding is performed using wear-resistant and corrosion-resistant materials. Grinding/Polishing: Sealing surfaces undergo ultra-precision grinding to achieve a surface finish of Ra≤0.4μm, ensuring zero leakage.
4.Final Inspection and Shipment
Non-Destructive Testing: Such as dye penetrant testing and ultrasonic testing, ensuring the absence of defects such as cracks and porosity. Hydraulic/Airtightness Testing: Pressure testing is conducted according to API, ASME, and other standards.
PTFE Anti-Sticking Functional Coating:
Targeting viscous, easy-to-caking materials such as fine powder, wet material and baking soda, the low-friction and anti-adhesion property of PTFE coating prevents material bonding and blockage of rotor gaps, ensures uniform and stable feeding of rotary valves, and reduces manual cleaning frequency.;
Tungsten Carbide Coating: Hardcore Performance for Harsh Abrasive Working Conditions
As the core wear-resistant solution for rotary valves, WC series tungsten carbide coating achieves a perfect balance of high hardness, toughness and impact resistance, becoming the preferred choice for high-abrasion working conditions.
Zero structural modification, rapid performance upgrade
The coating thickness is controllable from tens of microns to several millimeters. There is no need to change the original structural design and assembly precision of the rotary valve. It is compatible with new valve manufacturing and old valve renovation and repair
Rotary Airlock Designed for Abrasive Material
