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Che cos'è una pompa a membrana?

Separeco doesn’t use piston pumps or compressors in its systems, but diaphragm metering pumps only.

Although the cost is higher if this kind of pump is compared to a simple gas booster or piston pump, the advanteges are really considerabile.

In fact, diaphragm metering pumps are not affected by supercritical fluid because process fluids are completely separated from the mechanical part of the pump. Diaphragm metering pumps meet the highest requirements and demands of the chemistry, cosmetics, pharmaceutical and biotechnology industries, or food and beverage industries. Some of most important advantages are:

  • High energy-efficiency ratio,
  • Low maintenance costs,
  • Extremely long service life for diaphragms.


Membrane Pump

Whether navigating rough seas offshore or operating in the pristine environments of pharmaceutical cleanrooms, the global success of the ecoflow diaphragm metering pump is a testament to its reliability and cost-effectiveness across diverse industries.
Boasting precise metering rates and exceptional durability in the face of extreme operating conditions, this versatile pump offers low life cycle costs and impressive energy efficiency. A true all-around talent for various applications.

Absolutely safe startup
Initiating the metering pump is both safe and straightforward: In its non-operational state, a spring ensures the diaphragm is consistently pulled into a secure position. This guarantees maximum safety during system startup and extends the diaphragm’s service life significantly.

Low maintenance costs and a long service life
Lewa pumps are renowned for their extended service life across all components, coupled with exceptionally low maintenance and operating costs. By adhering to regular maintenance intervals, our diaphragm pumps can reliably operate for 40 years or more within your production process.

Safety and reliability in extreme operating states
At the core of our values is a commitment to safety and reliability. Our pump is engineered to withstand operating errors and extreme conditions without sustaining damage. With built-in safety mechanisms, we prioritize maximum protection for both users and machines. This safeguard extends not only to instances of excess primary pressure but also when pressure or suction lines are closed.

Membrane Pump: how it works

A membrane pump, also known as a diaphragm pump, is a type of positive displacement pump. It operates by using the reciprocating action of a flexible diaphragm, usually made of rubber, thermoplastic, teflon or metal. Here’s a step-by-step explanation of how it works:

  1. Suction Stroke: During the downward stroke of the diaphragm, the volume of the pump chamber increases. This decrease in pressure draws liquid or gas into the chamber.
  2. Discharge Stroke: The diaphragm then moves upward, decreasing the volume of the pump chamber. This increase in pressure forces the previously drawn fluid out.
  3. The cycle repeats as the diaphragm moves up again, drawing more fluid into the chamber.

The diaphragm serves a critical function as it acts as a dynamic seal between the liquid or gas being pumped and the pump drive, as well as the environment. This minimizes leakage and makes membrane pumps ideal for handling corrosive, abrasive, or sensitive fluids.

In addition to this, membrane pumps do not rely on other mechanical parts that come into contact with the transferred media except for the valves. They use the diaphragm’s upward and downward stroke action to draw and discharge liquid or gas.

Depending on pressure, membrane pump could be made of PTFE or metal. In each case, the membrane is generally double, to intercept the presence of pressure between the membrane sandwich, indicating a rupture.

Sandwich diaphragm
Sandwich diaphragm is not only extremely durable, but also well-protected. The DPS diaphragm protection system and a diaphragm monitoring system allow us to ensure that the diaphragm does not tear during operation and that the pump fluid is not contaminated.

Hermetically sealed
Diaphragm pumps work without dynamic seals in the process fluid area. This forms a hermetically sealed working area. No emissions escape to the outside, and contamination of the fluid is impossible.

Suitable for virtually all fluids
The ecoflow series is suitable for almost all liquids thanks to its flexible design. Whether they are dangerous, toxic, abrasive, viscous, environmentally harmful or sensitive fluids, the user-specific configuration always gives you the correct diaphragm metering pump.