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Positive Displacement Pumps

Introduction

Positive-displacement (PD) pumps displace a known quantity of liquid with each revolution of the pumping elements. This is done by trapping liquid between the pumping elements and a stationary casing. Pumping element designs include gears, lobes, rotary pistons, hose, diaphragms, vanes and screws.

PD pumps are found in a wide range of applications—chemical-processing; liquid delivery; marine; biotechnology; pharmaceutical; as well as food, dairy, and beverage processing. Their versatility and popularity is due in part to their compact design, high-viscosity performance, continuous flow regardless of differential pressure, and ability to handle high differential pressure.

Air Operated Double Diaphragm

The Metal Range The air operated double diaphragm pump (AODD) is a double acting positive displacement pump. The pump displaces fluid from one of its two liquid chambers upon each stroke completion. AODD pumps are commonly found in dangerous environments where there is no electricity supply or where the situation is hazardous and sparking could lead to an explosion.

Specification:

  • Max flow 50 m3/hr
  • Max pressure 8 bar (standard)
  • Connections: ¼" to 4"
  • Casing materials: Polyprop/Stainless/cast iron
    aluminium / PVDF/ hastalloy
  • Elastomers:Buna/Neoprene/ Viton/PTFE/EPDM

Applications:

  • Paints
  • Adhesives and resins
  • Hazardous chemicals
  • Oils and solvents
  • Ceramics
  • Sludges

Progressing Cavity

Mono-compac The heart of the progressing cavity pump is the rotor & stator. As the single helix rotor revolves eccentrically within the double helix of the stator, a continuous cavity is formed and progresses the liquid towards the discharge end of the pump. The design is suited for both low & high flow / pressure applications.

Specification:

  • Max flow 420 m3/hr
  • Max pressure 48 bar
  • Connections: ½" to 12"
  • Casing Materials: Cast Iron/ stainless steel
  • Stator Materials: Nitrile/Neoprene/Viton/ natural/
    Hypalon
  • Self priming

Applications:

  • Waste water
  • Oily water separation
  • Paints
  • Minerals
  • Adhesives
  • Bilge pumping

Peristaltic

MS Range A rubber tube is squeezed along its length by rollers/shoes that push the fluid contained within. The pump incorporates a rotor with the rollers/shoes mounted on it which continually rotates, compressing and relaxing the tube. This action moves the fluid through the tube with a constant rate of displacement for each revolution of the rotor. This gentle pumping action doesn't cause any damage to the product. The fluid only comes in contact with the hose and not with any rotating parts, so the pump is suitable for abrasive and corrosive applications. The tube's ability to reform after squeezing produces a vacuum that draws fluid into the tube, so very viscous liquids can also be pumped without problems.

Specification:

  • Max flow 80m3/hr
  • Max pressure 16 bar
  • Connections: 3/8" to 5"
  • Cast iron/stainless steel
  • Hose materials Nitrile/Natural/EPDM/Hypalon
  • Self priming

Applications:

  • Pigments
  • Water and waste treatment
  • Ceramics
  • Cement and concrete
  • Food and beverage

Internal gear

Internal gear pumpsInternal gear pumps are robust, give an even flow, handle both low and high viscosity products, are capable of high pressure and are self priming. The internal gear pump design is based on an internal idler gear rotating inside of a larger rotor.

Specification:

  • Max flow 250 m3/hr
  • Max pressure 14 bar
  • Connections ½" to 8"
  • Materials: Cast iron/Ductile steel/Stainless steel
  • Options: Jacketed/Mechanical seal/Packed gland
  • Self priming

Applications:

  • Tanker loading
  • Paints
  • Diesel/Bio Diesel
  • Adhesives and resins
  • Oils and solvents

External Gear

External gear pumpsThe external gear pumping principle uses two rotating gears which unmesh at the suction side of the pump to create voids which allow atmospheric pressure to force fluid into the pump. The spaces between the gear teeth transport the fluid along the outer perimeter of the housing to the discharge side. The gears are supported on both sides which allows high pressure capabilities.

Specification:

  • Max flow 45 m3/hr
  • Max pressure 34 bar
  • Connections: ¼" to 3"
  • Material: Cast iron/Stainless
  • Options: Relief valve/ Mechanical seal/Packed gland
  • Self priming

Applications:

  • Oils and solvents
  • OEM configurations
  • Diesels
  • Low volume transfers
  • General industry

Rotary Lobe

Rotary Lobe pumpsRotary Lobe pumps are used in a variety of diverse industries because they offer superb sanitary qualities, high efficiency, reliability, corrosion resistance, and good clean in place (CIP) and service in place (SIP) characteristics.

Specification:

  • Max flow 120 m3/hr
  • Max pressure 24 bar
  • Connections: 1" to 6"
  • Materials 316 Stainless steel
  • EHEDG & FDA approved
  • Self priming

Applications:

  • Food and beverage
  • Pharmaceutical
  • Paper and pulp
  • Chemical
  • Cosmetics

Flexible Impeller

Flexible ImpellerThe flexible impeller pump combines modern manufacturing technology to provide a simple, inexpensive pump ideally suited for most types of industries. The flexible impeller pump offers all the benefits of low price, easy installation and trouble free operation, along with high standards of hygiene.

Specification:

  • Max flow 30 m3/hr
  • Max pressure 4 bar
  • Connections: ¾" to 21/2"
  • Stainless steel / bronze
  • EHEDG & FDA approved
  • Self priming

Applications:

  • Food & beverage
  • Marine
  • Oils and solvents
  • Healthcare
  • Chemical