DL series are non-self-priming inline light weight vertical multistage pumps, the wet parts made of stainless steel grade SUS304 or SUS316L, produced by advanced stamping and welding technology, the pumps are available with standard motor, the inlet and outlet are located at same level (inline type).

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:

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.

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).

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.

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.

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.

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.

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.

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.

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.