168/170 Gasoline Self-Priming Pump 2-Inch/3-Inch/4-Inch Volute Pump Casing

• Customization: Available
• After-sales Service: 5 Years
• Warranty: 1 Years
• Max.Head: 8~1.5m
• Max.Capacity: 150~45000m³/H
• Driving Type: Magnetic
• Material: Stainless Steel
• Structure: Multistage Pump
• Assembly: Booster Pump
• Power: Electric
• Start Up: Electric Pump
• Type: Blade Pump
• Application: Submersible Pump, Clarified Water Pump, Sewage Pump, Slurry Pump, Oil Transfer Pump, Chemical Pump
• Industry: Chlor Alkali, Lithium
• Media: Sewage Pumps
• Performance: Explosion-Proof Pumps
• Theory: Axial Flow Pump
• Flow Speed: ~2m/S
• Temperature: -20~180ºC
• DN: 200-1700mm
• Transport Package: Plastic Film and Wood
• Trademark: GD
• Origin: Jiangyin City Jiangsu Province
• Production Capacity: 50000t/Year

Product Description

Please contact me if further specifications are required.
 

Pump Casing Manufacturing Process:

 

1. Casting or Forging (Blank Preparation)

• Casting (for complex shapes):

  • Sand Casting: Used for materials like cast iron (HT200, QT400) or stainless steel. Wooden or metal patterns create sand molds, followed by molten metal pouring.

  • Investment Casting (Lost-Wax): For high-precision or stainless steel casings. Delivers superior surface finish, reducing post-machining work.

• Forging (for high-pressure casings): Carbon/alloy steel forgings improve material density and strength via high-pressure forming.
   

2. Rough Machining

• Machine Selection: Gantry milling/boring machines for large casings; vertical machining centers (VMCs) for small/medium sizes.

• Reference Surface Machining: Initial machining of mounting flanges or mating surfaces to establish subsequent processing benchmarks.

• Hole & Internal Cavity Roughing: Drilling/rough boring of flange ports, bearing holes, etc., leaving 1-2 mm finishing allowances.
   

3. Heat Treatment

• Stress Relief/Aging: Eliminates residual stresses from casting/forging to prevent deformation.

• Quenching + Tempering (high-alloy steels): Enhances hardness and wear resistance.
   

4. Precision Machining

• CNC Machining Center:

  • Flow Path Profiling: Ball-nose cutters or copy milling for hydraulic-efficient internal contours.

  • Flange/Sealing Surfaces: Fine milling/grinding ensures flatness and surface finish (Ra ≤1.6 μm).

  • Hole System: Finish boring of bearing holes (H7 tolerance) and bolt holes for concentricity.

• Turning: For rotationally symmetric casings (e.g., volutes) using large lathes.
   

5. Drilling & Tapping

• Multi-Spindle Drilling/CNC: Bolt holes and auxiliary holes with positional accuracy (±0.1 mm).

• Threading: Manual/automatic tapping or thread milling.
   

6. Surface Treatment

• Anti-Corrosion: Sandblasting + anti-rust paint (cast iron); passivation (stainless steel).

• Coatings: Wear-resistant coatings (e.g., tungsten carbide) for high-pressure applications.
   

7. Quality Inspection

• Dimensional Checks: CMM (Coordinate Measuring Machine) for critical dimensions.

• Pressure Testing: Hydrostatic/pneumatic tests at 1.5× working pressure to verify sealing.

• NDT: Ultrasonic/X-ray inspection for internal defects (critical applications).

 

Key Process Considerations

• Split Casings: Separate machining of upper/lower halves, followed by aligned boring for sealing.

• Thin-Wall Deformation Control: Low cutting-force parameters (e.g., high-speed milling) to minimize vibration.

• Flow Path Polishing: Electrolytic or manual polishing (stainless steel) to reduce flow resistance.

 

Material-Specific Notes

• Cast Iron: Easy to machine but prone to edge chipping.

• Stainless Steel: Requires high-temperature-resistant tools (e.g., carbide) and ample coolant.

• Duplex Steel: High work-hardening tendency; use low depth-of-cut + high feed rates.