Description

The DL Series Vertical Multistage Pumps are high-performance, lightweight, and compact pumps designed for a wide range of applications. Below is a detailed description of their features, performance range, structure, motor requirements, materials, applications, installation guidelines, and maintenance tips:

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Description of DL Series Vertical Multistage Pumps

• Type: Non-self-priming, inline, lightweight vertical multistage pumps.
• Wet Parts Material: Stainless steel (SUS304 or SUS316L) manufactured using advanced stamping and welding technology.
• Design: Inline type with inlet and outlet located at the same level.
• Shaft Seal: Maintenance-free mechanical seal (cartridge type) for easy assembly and maintenance.
• Key Features: Compact, lightweight, low noise, and long working life.

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Performance Range

• Max. Head: Up to 250 meters.
• Rated Flow: 1, 2, 3, 4, 5, 8, 12, 16, 20, 32, 45, 64, 90 m³/h.
• Power Range: 0.5 HP to 60 HP.
• Operating Limits:
  • Liquid Temperature: -15°C to +110°C.
  • Ambient Temperature: Up to +40°C.
  • Max. Operating Pressure: 20 to 26 bar (depending on the model).

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Structure of Vertical Multistage Pumps

• Suction and Discharge: Located on the same axis.
• Connections: Available in flange, Victaulic, or male threads.
• Mechanical Seal: Easy-mounting design for fast and easy maintenance.
• Casing:
  • Outer barrel, back cover, bottom cover, and bracket are clamped together by bolts.
  • Inner case consists of stacked diffusers, each with an impeller.
• Motor: IMB14 or IMB5 standard motor connected to the pump shaft via a coupling.

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Motor Requirements

• Type: Two-pole induction motor with an aluminum alloy case.
• Power Options:
  • 0.37 to 2.2 kW: Single-phase or three-phase motors available.
  • Above 2.2 kW: Only three-phase motors available.
• Motor Features:
  • Insulation Class: F.
  • Protection: IP55.
  • Duty: Continuous.

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Main Materials

• Pump Body: Stainless steel.
• Impeller: Stainless steel.
• Inlet/Outlet Section: Stainless steel.
• Outer Sleeve: Stainless steel.
• Shaft: Stainless steel.
• Hydraulic Stack: Stainless steel.
• Base: Cast iron.

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Applications of DL Series Vertical Multistage Pumps

1. Water Supply:
   • Water filtration and transport in waterworks.
   • Boosting in main pipelines and high-rise buildings.
2. Industrial Water Pressure Boosting:
   • Process water systems, cleaning systems, high-pressure washing systems, and firefighting systems.
3. Industrial Liquid Conveying:
   • Cooling and air-conditioning systems, boiler feed water, condensing systems, and machine-associated purposes.
   • Handling acids and alkalis.
4. Water Treatment:
   • Ultrafiltration, reverse osmosis, distillation systems, separators, and swimming pools.
5. Agricultural Irrigation:
   • Farmland irrigation, spray irrigation, and drip irrigation.

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Installation Guidelines

1. Pre-Installation Checks:
   • Ensure the pump and motor are in good condition.
   • Check the arrow on the bottom cover for the discharge direction.
2. Installation Position:
   • Can be installed vertically or horizontally.
   • Ensure the installation area is well-ventilated for proper cooling.
3. Piping:
   • Use flexible or soft hoses on suction and discharge to reduce noise and vibration.
   • Install the pump on a vibration-proof base.
   • Install valves on suction and discharge pipes for maintenance convenience.
   • Use non-return valves to protect against water hammer.
4. Air Prevention:
   • Prevent air from entering the suction pipeline to avoid performance reduction.
5. Discharge Pipeline:
   • Install a drain valve near the discharge port to prevent siphonage or backflow of dirty liquid.
6. Electrical Wiring:
   • Must be done by a qualified electrician following local regulations.
   • Ensure proper grounding of the pump.

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Maintenance Tips

1. Power Off:
   • Always shut off power before performing maintenance.
2. Splined Shaft and Shaft Seal:
   • No regular maintenance is required.
3. Long Inactivity:
   • Remove the coupling guard and apply a few drops of silicone oil on the shaft seal to prevent sticking.
   • Drain the pump completely.
4. Freezing Conditions:
   • Ensure the liquid inside the pump is not frozen before starting.
   • Drain the pump completely after use during frost season to prevent damage.

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The DL Series Vertical Multistage Pumps are versatile, durable, and easy to maintain, making them ideal for a wide range of water supply, industrial, and agricultural applications. Proper installation and maintenance ensure optimal performance and longevity.

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