Air operated double diaphragm pumps

Air operated double diaphragm pumps for corrosive fluids. These displacement pumps are suitable for industrial applications for which the use of pneumatic pumps is necessary (as an alternative to electrical centrifugal pumps). They can be used in explosive areas or in case of high risk of running dry.

Plastic diaphragm pumps


  • Maximum flow-rate: 900 l/min.
  • Maximum head: 70 m w.c.
  • Materials: PP, PVDF.
  • For highly corrosive chemical fluids.

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Metal diaphragm pumps


  • Maximum flow-rate: 900 l/min.
  • Maximum head: 70 m w.c.
  • Materials: ALU, AISI 316.
  • For chemical fluids, food, pharmaceutical products.

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General technical features

  • Air-driven pumps (no electricity needed).
  • Pumps with adjustable flow-rate and head.
  • Extremely resistant to aggressive chemicals.
  • Dry running capability.
  • Suitable for use in potentially explosive atmospheres.
  • Positive displacement pumps with pulsating flow.

pompa membrana BX Savino Barbera

A.   Ball valves
B.   Pumping chamber
C1. Product-side diaphragm
C2. Air-side diaphragm
D.  Suction manifold
E.  Delivery manifold
F.  Pneumatic exchanger

BX Series double diaphragm pumps

Q max
H max Connections Atex Material
Liquid Air
BX5  5 l/min 70 m w.c. G ¼” G 1/8″ Zone 1 and 2 PP – PP/CF
BX15  17 l/min 70 m w.c. G 3/8″ G 3/8″ Zone 1 and 2 PP – ECTFE
BX30 30 l/min 70 m w.c. G ½” G ¼” Zone 1 and 2 PP – PVDF – ALU – AISI 316
 50 l/min 70 m w.c. G ½” G½” Zone 1 and 2 PP – PVDF – ALU – AISI 316
100 l/min 70 m w.c. G 1″ G ½” Zone 1 and 2 ALU – AISI 316
 100 l/min 70 m w.c.  G 1″ G ½” Zone 1 and 2 PP – PVDF
BX100 150 l/min 70 m w.c. G 1″ G ½” Zone 1 and 2 PP – PVDF – ALU – AISI 316
BX150 220 l/min 70 m w.c. G 1 ¼” G ½” Zone 1 and 2 PP – PVDF – ALU – AISI 316
BX250 340 l/min 70 m w.c. G 1 ½” G ½” Zone 1 and 2 PP – PVDF – ALU – AISI 316
BX251 340 l/min 70 m w.c. G 1 ½” G ½” Zone 1 and 2 PP – PVDF – ALU – AISI 316
BX502  650 l/min 70 m w.c. G 2″ G ½” Zone 1 and 2 ALU – AISI 316
BX522 650 l/min 70 m w.c. G 2″ G ½” Zone 1 and 2 PP – PVDF
BX503  900 l/min 70 m w.c.  G 3″ G ½” Zone 1 and 2 PP – PVDF – ALU – AISI 316

All BX double diaphragm pneumatic pumps are operated by a maximum air pressure of 7 bar.

index Catalogue for BX double diaphragm pumps
index Performance curves for BX double diaphragm pumps
index Installation charts for BX double diaphragm pumps

Corrosion resistant plastic materials

Selecting the most suitable model for each pump is indeed one of the main skills of Savino Barbera. Our choices have always been focused on the specific use that our industrial products are intended for. In our air-operated double diaphragm pumps, all wetted parts (pump boby, balls, diaphragms) are strictly made of corrosion resistant plastic material and include:

  • Corrosion-resistant plastic materials (PP, PVDF, ECTFE).
  • Metals for specific industrial applications (Aluminum and stainless steel).
  • Mechanically polished AISI 316 stainless steel for food, pharmaceutical and cosmetics applications.
  • Chemically inert gaskets (PTFE, EPDM, FPM, NBR).
  • Acid-resistant diaphragms (made of rubber, thermoplastic, PTFE).
  • Balls made of PTFE, AISI 316, EPDM, NBR.
  • Ball seats made of PP, PVDF, AISI 316, ALU, PE-UHMW, PP-V.

pompe a membrana materiali

PP                                     PVDF                                 AISI 316                             ALU

How air-operated double diaphragm pumps work

Basically, air-powered double diaphragm pumps (positive displacement pumps) are driven by a pneumatic
system rather than an electrical motor. So, the liquid transfer is performed without electricity. These AODD
pumps work with a sideways motion created by their diaphragms operating simultaneously in opposite
manners. The compressed air introduced by the pneumatic exchanger (A) behind one of the two diaphragms
generates compression and pushes the product into the delivery duct (B), at the same time the opposing
diaphragm (integral with the common exchanger shaft) creates a vacuum and intakes the fluid (C). Once
the stroke has been completed, the pneumatic exchanger diverts the compressed air behind the opposing
diaphragm and the cycle is reversed. The two diaphragms, linked together, typically achieve the pumping
action “by strokes”: the suction stroke takes place simultaneously with the compression stroke, until the
next cycle begins. Air-operated double diaphragm pumps are generally found to be efficient pumps in
presence of viscous, abrasive, solid-laden, delicate liquids.

come funziona la pompa a membrana

In all AODD pumps, the reciprocating action of the diaphragms generates a typical pulsating flow.

Installation charts

Four examples of the end use of our double diaphragm pumps:

tav. disegni singoli

Diaphragm pump for transferring liquid from barrels.

tav. disegni singoli

Self-priming diaphragm pump.

tav. disegni singoli

Wetted diaphragm pump.

tav. disegni singoli

Flooded suction diaphragm pump.

Corrosive liquids

Here are some of the aggressive liquids that are compatible with our diaphragm pumps:

  • Pumps for sulfuric acid.
  • Pumps for caustic soda.
  • Pumps for hydrochloric acid.
  • Pumps for muriatic acid.
  • Pumps for hydrogen chloride.
  • Pumps for sodium hydroxide.
  • Pumps for sodium bisulfite.
  • Pumps for chromic acid.
  • Pumps for sodium hypochlorite.
  • Pumps for bleach.
  • Pumps for hydrofluoric acid.
  • Pumps for ferric chloride.
  • Pumps for sodium chloride.
  • Pumps for aluminium chloride.
  • Pumps for polyaluminium chloride.
  • Pumps for phosphoric acid.
  • Pumps for acetic acid.
  • Pumps for nitric acid.
  • Pumps for aqua regia.
  • Pumps for sea water.
  • Pumps for copper sulfate.
  • Pumps for citric acid.
  • Pumps for formic acid.
  • Pumps for lactic acid.
  • Pumps for peracetic acid.
  • Pumps for sulfamic acid.
  • Pumps for sodium bisulfite.
  • Pumps for sodium nitrate.
  • Pumps for sodium pyrophosphate.
  • Pumps for sodium sulfate.
  • Pumps for ammonia.
  • Pumps for chemical fertilizers.
  • Pumps for pesticides.
  • Pumps for industrial deodorizers.
  • Pumps for glycerine.
  • Pumps for caustic potash.
  • Pumps for potassium persulfate.
  • Pumps for potassium permanganate.
  • Pumps for salicylic acid.
  • Pumps for tartaric acid.
  • Pumps for sulphur and derivatives.
  • Pumps for fuels.
  • Pumps for urea.
  • Pumps for ADBLUE.
  • Pumps for biodiesel.
  • Pumps for solvents.
  • Pumps for paint.
  • Pumps for ink.
  • Pumps for cleaning agents.
  • Pumps for industrial detergents.
  • Pumps for distilled water.
  • Pumps for peroxide.
  • Pumps for purified water.
  • Pumps for dyes.
  • Pumps for chemical additives.
  • Pumps for chemical extracts.
  • Pumps for photographic baths.
  • Pumps for brine.

Savino Barbera srl

Via Torino 12
10032 Brandizzo, ITALY
P.IVA 00520820010
R.I.TO 272-1974-2166
REA 489443
Cap. soc. 48000€ i.v.

Tel +39 011 913.90.63

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