Debem diaphragm pumps consist of a stall-prevention centrally-housed pneumatic exchangers. The new generation diaphragms (Long Life profile) are fitted to its shaft. At the two ends, the two pump casings house the ball valves and seats of the product suction and delivery duct.

A = ball valves
B = pumping chamber
C1 = product-side diaphragm
C2 = air-side diaphragm
F = pneumatic exchengers

The heart of an air-operated diaphragm pump consists of the stall-prevention pneumatic exchanger that DEBEM has succeeded in developing and innovating in a revolutionary manner, patenting the most durable and reliable system the market currently has to offer.

This device introduces compressed air to alter the pressure balance of the diaphragms assisted by a stall-prevention circuit that ensures optimum performance even under the most critical conditions.

The components
It has an extremely compact footprint and the small number of components ensures exceptional sturdiness and service life even under the most exacting conditions.
The air passages are carefully designed and optimised to prevent the formation of ice even in low-temperature and high-head applications.
The DEBEM pneumatic exchanger is an integrated system with a single central cartridge that does not require additional external components.

Operation
The range of DEBEM diaphragm pumps features a pneumatic exchanger that guarantees faultless operation even with low-pressure compressed air supplies (min 2 bar).
Air-chamber volumes and airways are carefully designed to optimise consumption.
Speed and flow rate can be easily adjusted by regulating air flow, whilst head can be adjusted as a function of compressed air supply pressure.

Diaphragms are the components subjected to greatest stress during suction and pumping, when they must also withstand the liquid’s chemical attack and temperature.
Correct assessment and selection is therefore crucial for diaphragm service life, investment decisions and maintenance costs.
A modern process of design, destructive testing and careful analysis of results has enabled DEBEM to develop LONG LIFE new generation diaphragms. The shape and profile of these products provides a greater working surface and improved load redistribution, thus reducing material stress and yield to a minimum.

RUBBER DIAPHRAGMS

They are made from rubber compounds with special additives that improve chemical properties as well as mechanical bending and strength characteristics. These diaphragms have a nylon backing cloth that improves stress distribution:

NBR: inexpensive and particularly suited to petroleum, abrasives and oil-based liquids;
EPDM: good acid, alkaline and abrasion resistance, as well as good flexibility even at low temperatures.

THERMOPLASTIC DIAPHRAGM

They are made from thermoplastic polymers that provide high mechanical stress resistance and distribution.

HYTREL: good abrasion resistance and suitable for food processing.
SANTOPRENE®: excellent acid and alkaline resistance, high flexural strength and good abrasion resistance.

PTFE DIAPHRAGM

This material is noted for its excellent resistance to high temperatures, chemicals and corrosive agents. DEBEM PTFE diaphragms are subjected to a double heat treatment in order to increase elasticity and service life. Each batch undergoes random destructive testing in order to verify its performance.
This diaphragm can be fitted together with one of those previously mentioned in order to increase resistance to the liquid’s corrosive chemicals and temperature.