Self-priming diaphragm pumps LB Series

The LB series self-priming diaphragm pumps are widely used wherever it is necessary to extract and evacuate foam, viscous, dense and sludgy liquids with abrasive debris and suspended solids. The high suction capacity and the ability to pump dry without damage make it particularly suitable for demanding applications.

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Varisco Self-priming diaphragm pumps

Technical data

FLOW

55 -425 l/min

Connections

Up to 125 mm

Self-priming capacity without auxiliary systems

Up to 6 m

Standard construction materials

Aluminium, Cast Iron, AISI 304 Stainless Steel, Polypropylene

Viscosity

Up to 1.000 mPas

Pressure

Up to 1,5 bar

Advantages

  1. Self-priming dry in seconds up to 6 m (4.5 m for LB65), ideal for emptying, frequent starts, speed of intervention.
  2. Damage-free dry running thanks to diaphragm technology with no parts requiring cooling and lubrication.
  3. Ability to handle difficult fluids: foams, fatty and sticky substances, viscous fluids, with fibres and suspended solids.
  4. High abrasion resistance: Its construction features allow the management of abrasive fluids with minimal wear and maintenance.
  5. Wide passage of suspended solids, with maximum dimensions close to the dimensions of the suction and delivery ports.
  6. Gentle handling that preserves the integrity of the pumped product.
  7. High chemical compatibility with a wide choice of materials: polypropylene, cast iron, stainless steel, aluminium - TPV elastomers, FKM, neoprene.
  8. Maximum operational safety due to the absence of oil lubrication and elimination of the risk of contamination.
  9. Quick and easy maintenance, with reduced plant downtime.

Advantages of TPV diaphragms

  1. Excellent tensile strength and elongation: superior to other thermoplastic elastomers and traditional elastomers.
  2. High mechanical strength: up to 3 times higher than conventional rubbers.
  3. Excellent abrasion resistance: ideal for applications in heavy wear conditions.
  4. High tear strength: for greater durability and integrity of the material.
  5. Wide temperature range of use: from -60°C to +135°C.
  6. Environmental resistance: in extreme conditions, for long operating life.
  7. Broad chemical compatibility, with resistance to: acidic and alkaline solutions, oils and greases, polar solvents, contaminated or polluted water and fuels.

LB SERIES

Working principle of diaphragm pumps

LB pumps are diaphragm pumps with a coupling rod driven by a gear box speed reducer. The flow generated by the movement of the diaphragm is controlled by check valves at the suction and delivery. As the diaphragm rises away from the bottom of the casing it produces a vacuum which draws the liquid into the casing through the suction valve. When the diaphragm is on the downstroke, the liquid is expelled through the delivery valve. LB pumps are reciprocating positive displacement pumps. The delivery line must therefore have an adequate diameter and be free to discharge the liquid being pumped to avoid pressure build up which can damage the diaphragm or the drive mechanism. The pump should be connected to pipework using sections of flexible hose to avoid transmitting the pulsations of the pump to the rest of the system.

Varisco Self-priming diaphragm pumps - 7
Viscous fluids

Applications

To ensure correct self priming diaphragm pump operation, it is crucial to pick the right product with respect to the application and the chemical-physical characteristics of the fluid being treated.

Pumps for wastewater
Wastewater

Flotation wastewater; addition of coagulants and sedimenting agents, pH correctors; primary and secondary sludge; draining and emptying of tanks and wastewater tanks.

Naval industry icon
Naval industry

Bilge drainage, sewage evacuation, stripping and cleaning of tanks

Chemical industry icon
Chemical industry

Transfer of solvents, acids, bases; addition of concentrated and aggressive products.

Food industry icon
Food industry

Transfer of slurry with suspended solids and fibres; addition of flavourings, additives, enzymes; food waste from tomatoes, fruit juices

Pumps for Water jet cutting
Water jet cutting

Transfer of waste water and washing water; recirculation and emptying of sludge tanks.

marble industry
Marble and ceramic

Abrasive sludge and mineral slurries; glazes, pastes; resins, additives and pigments..

Textile industry
Textile industry

Addition of dyes, bleaches, fixatives; exhausted baths and textile sludge; resins and finishing auxiliaries.

Pumps for Livestock industry
Livestock industry

Greasy wastewater and washing water; blood and animal by-products; feed and mixtures; addition of detergents and disinfectants; sludge tanks.

Pumps for recycling
P. E. T. Washdown and Recycling

Varisco pumps with electric motor can be used within the PET recycling cycle for handling the washing fluids of plastic waste to be recycled

News and Success Stories

Varisco provides news and success stories on pumping systems, enforcements from our customers and tips for the maintenance and use of internal gear pumps, open impeller pumps and more.

2024-08-31

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Varisco pumps for paper industry

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Varisco pumps can be used within the detergent powder production cycle to handle very abrasive slurry with high viscosity and for washing tanks and production lines, respectively.
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2023-11-30

Success story

Varisco pumps in PET recycling plants

Varisco pumps can be used within the PET (polyethylene terephthalate) recycling cycle for handling the washing fluids of plastic waste to be recycled and others.
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