LEADING THROUGH INNOVATION

Central flow technology

AIR OPERATED DOUBLE DIAPHRAGM PUMPS

I nno va t i ve I U n i q u e I S i m p l e I R el ia bl e I Du r a bl e I Com p a ct I Ef ficient I Qu iet I Versatile
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 Headquarters Offices and Technical Centre in Gijón (Spain)

FLUID HANDLING TECHNOLOGY

SAMOA, a privately owned company, is a leading European manufacturer
of equipment for fluid transfer, dispensing, dosing, recovery and
inventory control. SAMOA designs and manufactures volume flow
meters, hose reels, air operated piston pumps and air operated
diaphragm pumps, including innovative Directflo® diaphragm pumps.

PRODUCT DEVELOPMENT
Product research and development is a fundamental part of SAMOA’s
philosophy. We are in permanent contact with the market to identify
new customer needs, that we satisfy with product improvements and
new products.

MANUFACTURING
SAMOA’s headquarters have been in Gijón, on the Spanish North Coast,
for over 55 years. SAMOA’s manufacturing facilities are modern and Research & Development and Manufacturing facility in Gijón (Spain)
equipped with the latest state-of-the-art production equipment and
technology. We are committed to design and manufacturing excellence,
environmental sustainability and a healthy and safe workplace; our work
processes and facilities are consequently ISO 9001, ISO 14001 and SAMOA QUALITY AND LEADERSHIP
OHSAS 18001 certified.

DISTRIBUTION A
Our products are available through a network of knowledgeable
distributors. This global network provides a sales and consulting Product
Development
service, to identify the products that best meet each customer’s
Manufacturing
needs, and when required offers after sales service to ensure the
Distribution
long and satisfactory use of our equipment.

GLOBALLY COMPETITIVE FLUID

Our continuous product improvement process ensures that our C HANDLING B
products meet customer requirements worldwide, including in even the TECHNOLOGY
most demanding applications and environments. As a result, we are Quality and Globally
proud to say that SAMOA products are reliably working away, night Leadership Competitive
and day, in more than 100 countries.

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THE SAMOA FLOW DIVISION

RESEARCH & DEVELOPMENT

SAMOA’s R&D Department are at the cutting edge of

air operated pump developments and feed the product development
programme with innovative technology concepts.

PRODUCT DESIGN & ENGINEERING

Attractive product designs are created and robust product

engineering is ensured by using 3D CAD.

PRODUCT PROTOTYPING & TESTING

CAD-CAM manufacturing equipment dedicated to prototyping, and

a well equipped test laboratory, allow fast product evolution and the
release to market of optimized and fully proven products.

ROBOTISED CNC MANUFACTURING

High volume CNC manufacturing equipment is fed by robots. The

robotised material handling processes incorporate part cleaning and
100% automated part inspection.

QUALITY CONTROL INCLUDING FUNCTIONAL

TESTING
Components are inspected following SPC standards, many
sub-assemblies are 100% functionally tested and every finished
pump must pass an automated functional test. Pumps are run wet
and taken through a carefully defined test procedure, to ensure
zero defects on shipment.

RAPID & RELIABLE ORDER FULFILLMENT

SAMOA’s experienced customer service staff and worldwide

distributors can recommend the pump that best meets each
application’s needs.
After order entry, the ERP system drives the work flow through to
shipment. Low rotation products are built to order; a generous inventory
of finished parts allows fast delivery times. High rotation products are
stored in an automated warehouse integrated with the ERP system and
so can be shipped almost immediately after order entry.

EFFICIENT AFTER-SALES SERVICE

Prompt after-sales service and immediate spare parts availability

ensure a long and trouble-free pump life.

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 Central flow technology

DIRECTFLO®, BETTER BY DESIGN

SUPERIOR ALL-ROUND
PUMPING PERFORMANCE
Significant dry suction lift eliminates self-priming issues
Discharge fluids at up to 7 bar (100 psi), to pump even medium
viscosity fluids over long pipe runs and up to significant heights
Efficient compressed air usage

SIMPLE, RELIABLE & DURABLE

Few parts
Start up every time
Easy operation, for example: variable flow rate and pressure by
adjusting the air pressure
Inline servicing possible without disconnecting the fluid lines
Quick error free non-expert maintenance
Short stroke and robust construction long life diaphragms

ROBUST
Compact design
No protuding manifolds
Integrated muffler
Metal fluid connections and external parts for noncorrosive
applications
Tough plastic external parts for corrosive applications

SMOOTH RUNNING
Gentle pumping suitable for fluids that may form emulsions or shear
sensitive fluids
Stainless steel DF50 & DF100. Reduced pulsation: greater accuracy during dosing and less
splashing when dispensing
4 Fewer vibrations and lower noise level
INNOVATIVE SAMOA TECHNOLOGIES INSIDE

Conventional air operated diaphragm pumps pump the fluid around the outside of
the pump and compressed air acts on the inside face of the diaphragms.
Directflo pumps are inside out pumps, the fluid is pumped through A
the centre of the pump and compressed air acts on the outside
face of the diaphragms.

Important innovations were necessary to realise the

central flow concept and, whilst developing Directflo,
further inventions were made that built on the central
flow concept. A few highlights are described below.
E

B
NTED
PATE
LDW
IDE
WOR

A FRICTIONLESS PIVOTING AIR VALVE

High operational reliability
Variable flow rate and pressure by adjusting the air pressure C STRESS FREE DIAPHRAGM COUPLINGS
Non stalling
Non icing Non-rigid sliding couplings between push rod and diaphragms prevent
Self-cleaning diaphragm and push rod stress
Extremely fast switching between strokes reduces air consumption Long leak free diaphragm life
and minimizes pulsations Fast and easy diaphragm service
Enables a short stroke pump design, for long diaphragm life
Tolerates dry, damp, dirty or oily air
D SINGLE PART MOULDED PUMP BODY
B BALL CHECK VALVES Minimizes energy losses within the pump
ADJACENT TO DIAPHRAGMS No leaks
Compact
Very fast valve action, even with viscous fluids. Together with the high
speed frictionless pivoting air valve, this enables a short stroke pump
design, for long diaphragm life E FLANGE FASTENING PLATES
Enables superior pump suction and thus improves overall pump
performance Pumps with plastic central bodies are fitted with load spreading
stainless steel flange fastening plates
Reduces the risk of damage to plastic bodies when flange bolts are
over tightened
Enhances sealing in the areas between flange bolts and so reduces
the risk of flange leaks

Directflo® pumps are also available without the directional air valve and without the end
of stroke sensors, to be externally driven. These special pumps are used, for example, in
dosing applications. 5
 WIDE CHOICE OF MATERIALS

SINGLE PART MOULDED PUMP BODY

PP - Polypropylene: good chemical SS - Stainless Steel: robust,
compatibility resisting harsh fluids such excellent compatibility with solvents
as strong acids and alkalis. and many chemicals.

AC - Acetal: tough, impact PP (EX) - Conductive

resistant with good abrasion resistance Polypropylene: good chemical
and a low friction surface. Generally compatibility, as with nonconductive
good chemical resistance except for PP, and also enables pump earthing,
strong acids, alkalis and oxidizing to eliminate the risk of static electricity
agents. build up.

PVDF (Kynar® or Solef®) - AC (EX) - Conductive Acetal:

Polyvinylidene Fluoride: excellent chemical good compatibility with solvents and
compatibility. PVDF can be used with enables pump earthing, to eliminate the
many very chemically aggressive fluids, risk of static electricity build up.
including hot concentrated acids. Not
recommended for some strong alkalis. PVDF (Kynar® or Solef®)
(EX) - Conductive Polyvinylidene
AL - Aluminium: robust lightweight Fluoride: excellent chemical compatibility,
material used in many pH neutral as with nonconductive PVDF, and also
applications. Optionally can be enables pump earthing, to eliminate the
electroless nickel plated for use with risk of static electricity build up.
highly abrasive fluids.

LONG LIFE DIAPHRAGMS

PTFE (Teflon®) - Hytrel® - Durable with excellent
Polytetrafluoroethylene: all Directflo® abrasion resistance. Offers long life
PTFE diphragms are composite with chemically non aggressive fluids.
diaphragms with a PTFE fluid-side
diaphragm bonded to a textile Santoprene® -
reinforced EPDM diaphragm. The Very good resistance to abrasion
EPDM diaphragm supports the PTFE and long flex life. Good resistance
diaphragm to ensure a long life. to chemicals, but not recommended
Excellent fluid compatibility, including for solvents. Higher operating
with chemically highly aggressive fluids. temperatures than Hytrel®.

DIRECTIONAL AIR VALVE

AND AIR CHAMBER COVERS
AL - Aluminium: robust lightweight material for use in noncorrosive
environments.

PP - Polypropylene: good chemical compatibility and so suitable for use

in corrosive environments.

PP (EX) - Conductive Polypropylene: good chemical compatibility, as with

nonconductive PP, and so suitable for use in corrosive environments, also enables
pump earthing, to eliminate the risk of static electricity build up.

BALL CHECK VALVES

PTFE (Teflon®) - Polytetrafluoroethylene: excellent chemical
compatibility.

AC - Acetal: good resistance against abrasion and wide fluid

compatibility.

SS - Stainless Steel: optionally for use with high viscosity fluids.

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 A BALL VALVE SEATS B BALL VALVE GUIDES
SS - Stainless Steel: good AC - Acetal: good resistance against PTFE (Teflon®) -
resistance against corrosion and abrasion and wide fluid compatibility. Polytetrafluoroethylene: excellent
B abrasion. chemical compatibility.
C
PP - Polypropylene: good chemical
PVDF (Kynar® or Solef®) - compatibility resisting harsh fluids such SS - Stainless Steel: good
Polyvinylidene Fluoride: for fluids which as strong acids and alkalis. resistance against corrosion and
are not compatible with stainless abrasion.
steel, PVDF can be used with many PVDF (Kynar® or Solef®) -
very chemically aggressive fluids. Not Polyvinylidene Fluoride: PVDF can be used
A recommended for some strong alkalis. with many very chemically aggressive
C
fluids. Not recommended for some
strong alkalis.

C SEALS D BUSHING E PUSH ROD

EPDM - Ethylene Propylene PTFE (Teflon ) - ®
SS - Stainless Steel: good
Diene Monomer Rubber: wide chemical Polytetrafluoroethylene: excellent fluid resistance against corrosion and
compatibility, good abrasion resistance. compatibility and minimum friction. abrasion.

C FKM (Viton®) - PTFE (Teflon®) (EX) - HASTELLOY® - Hastelloy:

E
Fluoroelastomer: good chemical Conductive Polytetrafluoroethylene: excellent chemical compatibility,
C C compatibility, good abrasion resistance. excellent fluid compatibility including with many fluids that attack
and minimum friction, as with stainless steel such as hydrochloric
FFKM (Isolast® or nonconductive PTFE, and also enables acid and sodium hypochlorite.
Kalrez®) - Perfluoroelastomer: pump earthing, to eliminate the risk of
compatible with most chemicals, static electricity build up.
even at high temperatures. Not
recommended with concentrated nitric AC - Acetal: offers good
acid. Good abrasion resistance. resistance to a broad range of
PTFE (Teflon®) - chemicals, good abrasion resistance
D and a low friction surface.
Polytetrafluoroethylene: excellent fluid
compatibility, including with chemically
highly aggressive fluids.

NBR - Nitrile Butadiene Rubber:

often used in industrial applications with
chemically non aggressive fluids. Very
good abrasion resistance.

INSTALLATION OPTIONS

Flooded Suction Submerged

Self Priming Mixing Pump (50/50)

Air
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Air exhaust
Fluid
 MARKETS SERVED

APPLICATIONS

FLUID TRANSFER AND

DISPENSING

FLUID EVACUATION

VEHICLE PRODUCTION & MAINTENANCE CONSTRUCTION & MINING

DOSING/BLENDING/
FORMULATION

FLUID RECIRCULATION

PRINT & PACKAGING / PULP & PAPER CONVERTERS PAINT & COATINGS

SUPPLY FOR LOW

PRESSURE SPRAY

FLUID FLUSHING/
CLEAN IN PLACE (CIP)

PROCESS WATER / SURFACE TREATMENTS / METALWORKING

WASTEWATER

PUMPING SAMPLES

FILTER &
FILTER PRESS FEEDING

CHEMICAL, PETROCHEMICAL & REFINERIES HYGIENIC APPLICATIONS

SLURRY HANDLING
FLUIDS
Acids Abrasive
Alkalis Corrosive
Alcohols Hazardous
Solvents Flammable
Water based fluids Solids in suspension
TANK/BARREL FILLING Chemicals Shear sensitive
& EMPTYING Fuels & oils Medium viscosity
Inks, paints & varnishes
Additives
Etc.
8 CERAMIC SLIP & GLAZE
*For further details of markets served and applications please see page 23.
Directflo® PUMP RANGE
PLASTIC PUMPS
Plastic Directflo® pump wetted bodies are compatible with even the most aggressive chemicals, and the plastic
directional air valve and air chamber covers are suitable for use in corrosive environments.

DF PUMPS DF30 DF30T DF50 DF50T DF100

Pressure ratio 1:1 1:1 1:1 1:1 1:1

Maximum free delivery (1) 38 l/min (10 US gal/min) 38 l/min (10 US gal/min) 50 l/min (14 US gal/min) 50 l/min (14 US gal/min) 100 l/min (28 US gal/min)

Delivery per stroke approx. (1) 0,07 litres (0.02 US gal) 0,07 litres (0.02 US gal) 0,1 litres (0.026 US gal) 0,1 litres (0.026 US gal) 0,25 l (0.07 US gal)

Delivery per cycle (2 x strokes) (1) 0,14 litres (0.04 US gal) 0,14 litres (0.04 US gal) 0,2 litres (0.05 US gal) 0,2 litres (0.05 US gal) 0,50 l (0.13 US gal)

Air pressure operating range 1,5 to 7 bar (22 to 102 psi) 1,5 to 7 bar (22 to 102 psi) 1,5 to 7 bar (22 to 102 psi) 1,5 to 7 bar (22 to 102 psi) 1,5 to 7 bar (22 to 102 psi)

Solids in suspension max. size 3 mm (1/8") 3 mm (1/8") 3 mm (1/8") 3 mm (1/8") 4 mm (3/16")

Maximum dry suction lift (1) 4 m (13') 4 m (13') 6 m (20') 6 m (20') 4,5 m (15')

Maximum wet suction lift (1) 8 m (26') 8 m (26') 8 m (26') 8 m (26') 7 m (23')

Weight 1,9 kg (4.19 lb) 1,9 kg (4.19 lb) 2,2 kg (4.85 lb) 2,2 kg (4.85 lb) 5,1 kg (11.24 lb)
1/2" BSP/NPT (F) and 2 x 3/8" BSP/NPT (F) and 1/2" BSP/NPT (F) and 2 x 3/8" BSP/NPT (F) and 1" BSP/NPT (F) and
Fluid inlet connection
flange flange flange flange flange
1/2" BSP/NPT (F) and 1/2" BSP/NPT (F) and 1/2" BSP/NPT (F) and 1/2" BSP/NPT (F) and 1" BSP/NPT (F) and
Fluid outlet connection
flange flange flange flange flange
Air inlet connection 3/8" NPSM (F) 3/8" NPSM (F) 3/8" NPSM (F) 3/8" NPSM (F) 3/8" NPSM (F)

Wetted part materials See recommended models in corresponding pump page

(1) Data measured with water, air inlet pressure 7 bar (100 psi), 20 ºC (68 ºF).

METAL PUMPS
Metal Directflo® pumps are extremely robust and thanks to a wide range of wetted materials
are compatible with many fluids.

DF PUMPS DF50 DF50T DF100 DF250

Pressure ratio 1:1 1:1 1:1 1:1

Maximum free delivery (1) 50 l/min (14 US gal/min) 50 l/min (14 US gal/min) 100 l/min (28 US gal/min) 250 l/min (66 US gal/min)

Delivery per stroke approx. (1) 0,1 litres (0.026 US gal) 0,1 litres (0.026 US gal) 0,25 l (0.07 US gal) 0,6 l (0.16 US gal)

Delivery per cycle (2 x strokes) (1) 0,2 litres (0.05 US gal) 0,2 litres (0.05 US gal) 0,5 l (0.13 US gal) 1,2 l (0.32 US gal)

Air pressure operating range 1,5 to 7 bar (22 to 102 psi) 1,5 to 7 bar (22 to 102 psi) 1,5 to 7 bar (22 to 102 psi) 1,5 to 7 bar (22 to 102 psi)

Solids in suspension max. size 3 mm (1/8") 3 mm (1/8") 4 mm (3/16") 6 mm (1/4")

Maximum dry suction lift (1) 6 m (20') 6 m (20') 4,5 m (15') 5 m (16.4’)

Maximum wet suction lift (1) 8 m (26') 8 m (26') 7 m (23') 8 m (26’)

Weight 3,5 kg (7.72 lb) 3,5 kg (7.72 lb) 7,2 kg (16 lb) 20 kg (45 lb)
2 x 3/8" NPSM (F) and 1 1/2" BSP (F) and DIN PN-10 flange or
Fluid inlet connection 1/2" NPSM (F) and flange 1" BSP/NPT (F) and flange
flange 1 1/2" NPT (F) and ANSI B16.5 150 lb flange
1 1/2" BSP (F) and DIN PN-10 flange or
Fluid outlet connection 1/2" NPSM (F) and flange 1/2" NPSM (F) and flange 1" BSP/NPT (F) and flange
1 1/2" NPT (F) and ANSI B16.5 150 lb flange
Air inlet connection 3/8" NPSM (F) 3/8" NPSM (F) 3/8" NPSM (F) 1/2" NPSM (F)

Wetted part materials See recommended models in corresponding pump page 9

(1) Data measured with water, air inlet pressure 7 bar (100 psi), 20 ºC (68 ºF).
 SAMOA INDUSTRIAL, S.A. - FLOW DIVISION
BOX. 103
POL. IND. PORCEYO, I-14 - CAMINO DEL FONTÁN, 831
E-33392 GIJÓN (ASTURIAS) SPAIN
Tel.: +34 985 381 488 - Fax: + 34 985 147 213
flow@samoaindustrial.com
www.samoaindustrial.com/flow

©Copyright, SAMOA INDUSTRIAL, S.A.

SAMOA Industrial, S.A. is an ISO 9001, ISO 14001

and OHSAS 18001 certified company.

990951 · R-06/15 · 2000 u. · Cubierta Creator Silk 300 gr/m2 · Interior Creator Silk 170 gr/m2

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