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DEPA-Air Operated Diaphragm Pu mp

Innovative technologywith traditionFor more than 30 years the range of DEPA air operated diaphragm pumps has been established as a high qualitypositive displacement pump for all types of industry.

Every day these pumps prove their reliability and efficiencyall over the world during harsh operation and under toughestapplication conditions.

Through the years this product range of air operated diaphragm pumps has been continuously updated and improved by intensive research, development and the use of new materials.

Quality demands of different industries as well as ease ofoperating and maintenance are always main objectives in the manufacturing of these products.

The latest production methods, inspection and testingsystems for quality assurance, together with documentedprocess sequences in accordance with DIN EN ISO 29001ensure the high quality of the DEPA products.

With this wide product range the DEPA pumps meet almostall demands and requirements of our customers with theirincreasingly complex pumping processes.

Using the knowledge gained over time, linked with the resulting experience and pump application know-how, customer and market specific solutions can be quickly suggested.

With targeted investments in new technologies, manufacturing methods and service, the DEPA range of air operated diaphragm pumps will continue to maintaintheir first class position with the users in the future.

Benefits at a glance:● gentle conveyance of liquid or viscous

products

● ideal for abrasive, viscous, and shear sensitive media

● can handle media with entrained solids

● tolerant of dry running

● no dynamic or pressure loaded seals

● mobile, easy to transport units

● infinite regulation of pumping capacity

● dry self-priming

● can run against closed valves

● modern compressed air control, low maintenance, oil free

● submersible designs

● also suitable for use in explo-sive and hazardous areas

● operation and maintenance friendly

DEPA-DL-M_GB_Prospekt 23.10.2001 9:37 Uhr Seite 2

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Pu mps

DEPA air operated diaphragm pumps are suitable for a vast variety of

applications and are not fixed to just one type of installation. Fixed installation

into the process flow is possible as is use as a portable or mobile unit that

can be transported to various places of use.

Pump, self-priming DEPA air operated diaphragm

pumps are dry self-priming.

Depending on the pump design a

suction lift of up to 9m WC can be

achieved with a filled suction pipe.

Pump with inlet pressureDepending on the pump type the

suction side inlet pressure must be

limited to max. 0.7 bar. In this case

a valve is required to isolate the

suction pipe.

Pump, sub-mergedDEPA air operated

diaphragm pumps

can be totally sub-

merged in the pumping medium.

The chemical compatibility of the

pump material must be checked

beforehand. The exhaust outlet

must remain above the fluid level.

Pump on drumDEPA air operated

diaphragm pumps of

type DF 25 can be

directly mounted on

drums or containers.

For ease of use the

pump is mounted on the container

complete with adapter. The suction

pipe is supplied with the pump.

Installation


4

Flexible, modular design

1

3

4

5

2

Material options, housingFA aluminiumCA cast ironCX cast ironSA cast stainless steel 316 LSX cast stainless steel 316 LSL stainless steel 304 polishedUL stainless steel 316 L polishedPP polypropylenePL polypropylene, electr. conductivePM polypropylene, injection mouldedPT PTFETL PTFE, electrically conductive

DEPA air operated diaphragm pumps were developed as a flexible,modular design covering all product ranges and pump sizes.

This modular design reduces both the spare parts holding as well as the number of individual parts used per pump. This means: low maintenance costs and short downtimes.

By simple changeover of diaphragms, valve seats and valve balls the user can adapt existing pumps to other product applications.

Material options, centre blockFA, SA, CA aluminiumSX, CX bronzeSL, SA, UL aluminium, nickel coated

Stainless steel (option)PP, PM, PT polypropylenePL, TL polypropylene,

electr. conductive


5

7

5

6

Material options,valve seatB NRSE EPDMF VitonG EPDM greyN NitrileR Stainless steel T PTFEH Stainless steel

only DB

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Material options,valve ballsB NRSE EPDMF VitonG EPDM greyN NitrileR Stainless steelT PTFEV NRS/steel coreW EPDM/steel coreX EPDM grey/steel

coreY Nitrile/steel coreZ PTFE/steel core

Material options,diaphragmsB NRSD EPDM HDE EPDMF VitonG EPDM greyN NitrileP PTFE (DH only) T PTFEU EPDM grey

(DH only)


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ABy filling the right hand air chamber with air (blue) the right-hand diaphragm is pushed

outwards. This pulls the piston rod on theleft-hand diaphragm to the initial position.The valve ball (1) is drawn out of its position, the medium (red) flows into theleft-hand pump chamber. At the sametime valve ball (2) is seated in a closedposition by the vacuum. The left-handpump chamber fills up with medium (red).

BThe control valve switches overthe air flow into the left-hand airchamber (blue), the right hand air

chamber is exhausted. The suction process (see A) now takes place in theright hand pump chamber. Medium (red)is drawn in. Medium (green) is pressedout of the left-hand pump chamber. Valve ball (1) is pressed down and clo-ses, whereas valve ball (2) opens allo-wing the medium to flow to the outlet.

CSuction process "A� is repeatedwith the difference that the right-hand pump chamber is already

filled with medium (green). When the control valve switches over the right-handair chamber (blue) is filled, medium (red)is draw into the left-hand pump chamberand pressed out of the right-hand pumpchamber (green).

DThis sequence is repeated inreverse order to illustration C. The left-hand air chamber (blue)

is filled, medium (red) is drawn into theright- hand pump chamber by vacuum, at the same time the medium (green) isdisplaced from the left-hand pump chamber into the discharge pipe.

1

2 4

3

1

2 4

3

1

2 4

3

1

2 4

3

FunctionDEPA air operated diaphragm pumps areoscillating positive displacement pumpswith two back to back pump chambers.These are each divided by a diaphragminto an air and a fluid area.

Both diaphragms are connected by apiston rod, with the effect that during onepumping stroke medium is pressed out ofthe one pump chamber, while medium isbeing drawn into the other pump chamber.

The four adjacent drawings describe thesequence of a complete cycle consistingof a suction and pressure stokes of anempty and filled air operated diaphragmpump.

In order to help explain the process themedium to be pumped is coloured(red/green).


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Pu mps

flow rate m3/hT

otal

dis

char

ge p

ress

ure

in b

ar

Tot

al d

isch

arge

pre

ssur

e in

psi

10

0,5 1 2 5 10 20 40 70

2,2 4,4 8,9 22,2 44,4 86,8 177,6 311

DL08 DL10 DL15 DL25 DL40 DL50 DL80

0

20

30

70

60

50

40

100

90

80

flow rate u.s. gal./min

7

6

5

4

3

2

1

All DEPA air operated diaphragm pumps are self-priming.There is a difference between "dry� (without medium)and "wet� (with medium) priming. When calculating thepumping capacity the specific gravity of the product andthe respective suction lift must be taken into

consideration. In addition to this the losses caused bypiping or hoses on the suction side and the specific properties of housing and diaphragm materials must alsobe included.

The graph serves as reference. Exact data can be found on the respective data sheets.

Capacity reduction with specified suction lift

All capacity curves shown in the diagram are related towater (1 mPas).

In order to determine the exact pump capacity for viscous media, the reductions shown in the diagram

must be considered in dependence on the viscosity. In addition, the factors such as product flow properties,length and cross-section of piping or hoses on suctionand discharge side, valves and pump sizes with theirspecific characteristics must be taken into consideration.

Capacity reduction with viscous fluids

%

80

60

40

20

00 2 4 6 8 10 mWs

Cap

acit

y re

du

ctio

n

Capacity reduction with specified suction lift

Suction lift

Example: with a suction lift of 4 mWc the pumping capacity is reduced by approx. 20%. With different specification pumps variations are possible.

%

80

60

40

20

00 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 22000A

vaila

ble

pu

mp

ing

cap

acit

y

Capacity reduction with viscous fluids

Viscosity of pumped medium in m Pas/Cp

Example: when drawing a product with a viscosity of 6000 mPas the pumping capacity of the pump is reduced to 60% of its rated value based on water.

SelectionPump capacityWhen selecting air operated diaphragm pumps the following operational factors should generally be considered in order to achieve a long lifetime and low maintenance costs:

■ medium to be pumped, viscosity, proportion of solids■ pumping capacity in relation to the operating period

per day■ suction and pressure conditions

An optimal size is achieved when, after consideration ofthese parameters, the performance range of the pumpis in the middle section of the curves.


Air control unitFor trouble free operation of an air operated diaphragmpump the control valve is of major significance. The control valve is responsible for the distribution of air inthe individual chambers and thereby determines the fun-ction of the pump.

Around the world DEPA air operated diaphragm pumpsare subjected to a vast variety of temperatures, pressurefluctuations, full load and intermittent operating conditions. This places high demands on the air controlunit.

In order to meet the requirements of industry, intensiveresearch and development work has been performedover the last three decades. Functional safety and lowmaintenance requirements were major objectives.

DEPA air operated diaphragm pumps can be equippedwith either internal or external air control unit. Theselong-term field-proven air control units are chosen foreach specific application or by request of the customer.

Internal air control unit

■ freezing virtually eleminated■ no dead centre■ low maintenance, oil free

operation■ suitable for outside

applications■ economical■ insensitive against slightly

contaminated compressed air

■ durable

External air control unit

■ quickly replaceable■ low start-up pressure■ no dead centre■ low maintenance, oil free

operation■ economical, suitable for

all pumps■ simple handling■ durable

Elastomere materialsThe base products for elastomer production are naturaland synthetic rubbers. The different temperature, flexibility and durability properties of elastomer materials are mainly dependent on the type of rubberbase, the respective mixture composition and the manufacturing process.

The advantages of the various elastomer mixtures areutilised in the manufacturing of diaphragms.

The specific design of the DEPA diaphragm has beencontinuously developed over the years. Moreover, themanufacturing process is of utmost importance for thelifetime of the diaphragm. During the forming process anadditional fabric is integrated into this type of diaphragm,which enhances the stability. The vast variety of applications for air operated diaphragm pumps calls for awide product range of diaphragm materials.

NRS versatile multi-purpose diaphragm with verygood wear characteristics, high tensilestrength and elasticity.Applications: abrasive media, highly dilutedacids and alkaliesApplication temperature range: -15°C - +70°C (+5°F - +158°F)

EPDM (Nordel)versatile multi-purpose diaphragm for chemi-cals with high durability, FDA-approvedApplications: chemicals, hot water andsteam, solvents and alcoholsApplication temperature range: -25°C - +90°C (-13°F - +194°F)

EPDM grey (Nordel)Food approval (FDA)Applications: food, pharmaceutical, bever-age industryApplication temperature range: -25°C - +90°C (-13°F - +194°F)

NBR (Buna-N)versatile multi-purpose diaphragm for oilcontaining slurries,Applications: good chemical resistanceagainst mineral oils, grease and fuelsApplication temperature range: -15°C - +90°C (+5°F - +194°F)

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Viton (FKM)special diaphragm for chemicals and hightemperatures.Applications: outstanding resistance againsthigh temperatures, aromatic hydrocarbonsApplication temperature range: -15°C- +120°C (+5°F - +248°F)

Teflon (PTFE)Applications: highest chemical resistanceagainst aggressive mediaApplication temperature range: -5°C - +130°C (+23°F - +266°F)

For information on the chemical resistance and the permissibleapplication temperature ranges for the respective diaphragmplease refer to the separate compatibility list.

Pu mps

Housing materialsAluminiumversatile housing material with good allround propertiesTemperature range: -10°C - +100°C (+14°F - +212°F)

Cast ironhousing material used in mining or for particularly abrasive materialsTemperature range: -10°C - +100°C (+14°F - +212°F)

Stainless steel 316 Lhigh level of chemical resistance, preferablyused in chemical industry and, as a highlypolished version, in the food and pharmaceutical industryTemperature range: -25°C - +100°C (-13°F - +212°F)

Polypropyleneis characterised by its high resistanceagainst acids and many water soluble, inorganic acids and alkalies. Also availableas electrically conductive housing material.Temperature range: 0°C - +80°C (+32°F - +176°F)

PTFEexcellent chemical and temperature resistance with aggressive media and chemicals, also available as electrically conductive housing material.Temperature range: -20°C - +100°C (+4°F - +212°F)

DL Standard pumpDF Drum pumpDZ Dual Action pumpDP Powder pumpDB High pressure

pumpDH Stainless steel

pump

08 1/4�10 3/8�15 1/2�25 1�40 1 1/2�50 2�80 3�125 5�

Pump type

FA AluminiumCA Cast ironCX Cast iron/bronzeSA cast stainl. steelSX cast stainless

steel/bronzeSL Stainl. steel 304

polishedUL Stainl. steel 316 L

polishedPP PolypropylenePL Polypropylene

electr. conductivePM Polypropylene

inject. mouldedPT PTFETL PTFE electr.

conductive

B NRSD EPDM HDE EPDMF VitonG EPDM greyN NitrileP PTFE only HDT PTFEU EPDM grey

only DH

B NRSE EPDMF VitonG EPDM greyN NirileR Stainless

steelT PTFEH Stainless

steelonly DB

B NRSE EPDMF VitonG EPDM greyN NitrileR Stainless steelT PTFEV NRS / steel coreW EPDM / steel coreX EPDM grey / steel

coreY Nitrile / steel coreZ PTFE / steel core

Pump size

Material combinationhousing/control block

Diaphragms Valve seat Valve balls

Pump coding- SA - E E T25DL


DL 15 DL 25 DL 40 DL 50 DL 80Type (1/2�) (1�) (1 1/2�) (2�) (3�)

FA ● ● ● ● ●CA - ● ● ● ●CX - ● ● ● ●SA - ● ● ● ●SX - ● ● ● ●

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DEPA air operated diaphragm pumps made of cast metal have established themselvesover decades in various industrial areas.World-wide installations on ships, well-knownceramic manufacturers, in spray paintingsystems in the automobile industry and inmining are amongst our many varied applications.

In the range of cast metal pumps more than 20models with different sizes and designs are avai-lable to serve almost any type of application.

The sturdy cast metal construction ensures highabrasion resistance when pumping abrasive

■ Type FA � Aluminium■ Type CA � Cast iron■ Type CX � Cast iron / bronze■ Type SA � Cast stainless steel 316L■ Type SX � Cast stainless steel

316L / bronze

media, a low flow resistance due to the high surface finish, availability throughout a wide temperature range, excellent corrosion resistance and a long lifetime.

In combination with the well-established air control system these compact and powerful cast metal pumps are easy to transport and are therefore used as mobile units or stationaryequipment.

During the development of the pumps greatattention was paid to service friendliness, inorder to minimise downtimes.

Due to the use of stainless steel clamp bandsDEPA air operated diaphragm pumps are clearlydistinguished from other air operated diaphragmpumps. They can be easily disassembled without any special tools and keep the diaphragms evenly clamped.

DEPA-Air Operated Diaphragm Pu mpMetal pumps, series M


Main applications:

● Paint and varnish industry

● Automobile industry

● Waste water industry

● Ceramic and porcelain industry

● Mining, building industry

● Chemical industry

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Special emphasis must be made on the modulardesign, which leads to a reduction of spare partsto be stocked. DEPA cast metal pumps can befitted with a vast variety of accessories, depending on the applications they are used for.

As standard all cast metal pumps are equippedwith aluminium air centre blocks.

DEPA air operated diaphragm pumps can alsobe used in industrial applications and for applications in which the environment or themedia is not suitable for aluminium.

These applications are covered by centre blocktypes CX and SX (bronze or stainless steel).

Building sites

Automobile industry Chemical industry

Waste water industry Porcelain industry

Paint and varnish industry

Applications

Dimensions (mm)

Type A B C DDL 15 190 225 180 122DL 25 236 322 241 200DL 40 310 407 306 255DL 50 412 540 415 340DL 80 510 680 522 420

Pu mps

Dimensions (inch)

Type A B C DDL 15 7,5 8,9 7,1 4,8DL 25 9,3 12,7 9,5 1,7DL 40 12,2 16,1 12,1 10,0DL 50 16,2 21,3 16,3 13,4DL 80 20,1 26,8 20,6 16,5


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■ Type PP � Polypropylene, solid■ Type PM � Polypropylene,

injection moulded■ Type PL � Polypropylen, conductive■ Type PT � PTFE■ Type TL � PTFE conductive

Series P made of mechanically manufactured or specially injectionmoulded plastic parts was designed forproblem free pumping of corrosive andabrasive products in galvanic applications, in the chemical industryand in mechanical engineering.

Technically usable metals not always posses the required chemical resistancewhen being used with corrosive media.DEPA air operated diaphragm pumps wereconsequently developed, for which the individual parts are made of plastic material.

DL 08 DL 10 DL 15 DL 25 DL 40 DL 50 DL 80Type (1/4�) (3/8�) (1/2�) (1�) (1 1/2�) (2�) (3�)

PP - - ● ● ● ● ●PM - - ● ● ● - -PL - - ● ● ● ● ●PT ● ● ● ● ● ● ●TL ● ● ● ● ● ● ●

When developing series P the objectivewas not to introduce any pumping pressurereduction in contrast to the cast metalpumps. These pumps can also be used upto max. pressure of 7 bar.

DEPA air operated diaphragm pumps oftype PM are further developments of thewell established and successful range ofpolypropylene pumps. With these pumpsmodern industrial design is combined withthe every day requirements these pumpsmust meet, such as temperature and chemical resistance as well as low wear.

By using a computer aided injection moulding method a uniform, high qualitysurface finish is achieved, which ensureslow flow losses and excellent abrasion resistance.

DEPA-Air Operated Diaphragm Pu mpPlastic pumps, series P


Main applications:

● Galvanic and coating

● Paper and timber industry

● Paint and varnish industry

● Pharmaceutical industry


● Plant and mechanical engineering

● Power stations, waste disposal technology

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Despite the compact construction the result ofthis design offers high mechanical stability.Pumps constructed of electrically conductive plastic materials enhance the product range.These enable the conveyance of non-conductiveproducts in explosion endangered environments.

Depending on the application there are 5 typesof electrically conductive polypropylene or PTFEmodels available.

The wide range of materials of construction enables the universal use of these pumps. Achoice can be made between internal or externalmounted air control valves. ANSI, DIN and JISflanges as well as threaded connections arealternatively available. Product contact parts(diaphragms, valve seats and balls) are availablein a selection of materials to ensure compatibilitywith a wide range of pumped media.

Galvanic Chemical industry

Coating Paper and timber industry

Paint and varnish industry Waste disposal technology

Applications

Dimensions (mm)


Pu mps

Dimensions (inch)



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DEPA-Air Operated Diaphragm Pu mpStainless steel pumps, series L

■ Type DL-SL � Stainless steel 304 polished

■ Type DL-UL � Stainless steel 316 Lelectrically polished

■ Type DH-UL � Stainless steel 316 Lelectrically polished(flanged design)

Series L are made of extra-bright polishedstainless steel developed for applicationsin the food, pharmaceutical, cosmetic andbeverage industries.

In these industries stainless steel pumpshave been an indispensable standard formany years, used for process and transferduties.

The high demands placed on pumps withrespect to housing materials (stainless steel304 or 316 L), surface quality (up to 0.5 µmavailable) and approved elastomere materials (FDA) can be met with this versatile range.

DL 15 DL 25 DL 40 DL 50 DL 80Type (1/2�) (1�) (1 1/2�) (2�) (3�)

DL-SL ● ● ● ● ●DL-UL ● ● ● ● ●DH-UL ● ● ● ● -

This range can be supplied with the option of internal or external lubricant free air control valves. Contamination of the pumpedmedium and the surrounding environment istherefore eliminated. Cleaning methods andability to sterilise i.e. CIP (Clean in place)and SIP (Sterilise in place), which have varying standards throughout the world, werealso focal points during the design of thesepumps. Polished stainless steel pumps aretherefore available as SL (304) or UL (316 L)versions with extra-bright tightening clampbands and as DH-UL version in a flangedconstruction design.

Pumps can be supplied with optional fluidconnections, such as dairy tube fitting,Aseptic, Triclamp or Neumo, as required forthe application.


Main applications:



● Biotechnology

● Medical applications

● Cosmetic industry

● Food industry

● Dairies

● Beverage industry

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Pu mps

Due to the large ball valve clearances thesepumps are can handle media containing solids,such as pieces of fruit, meat or vegetable. SolidSize is dependent on the pump size. These sensitive products are transferred through thepump without damage.

All polished stainless steel pumps are deliveredwith an extra-bright polished frame, which, onsome models, is adjustable in height.

Various types of mobile units can be supplied tomeet customer�s requirements.

Chemical industry Beverage industry

Pharmaceutical industry Cosmetic industry

Applications

Type DH-UL

Type DL-SL und DL-UL

Dimensions (mm)

Type A B C DDH 15 285 407 310 180DH 25 390 540 415 335DH 40 465 700 575 335DH 50 627 861 714 335

Dimensions (mm)


Dimensions (inch)


Dimensions (inch)

Type A B C DDH 15 25,4 16,0 12,2 7,1DH 25 15,4 21,3 16,3 13,2DH 40 19,2 27,6 22,6 13,2DH 50 24,7 33,9 28,1 13,2


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Main applications:

● Manufacturing of plastic products

● Basic chemistry


● Breweries

● Food industry

DEPA-Air Operated Diaphragm Pu mpSpecial DesignsPowder pumpsType DP

High pressure pumpsType DB

Main applications:

● Ceramic industry


● Waste water industry


● Environmental technology

DEPA air operated diaphragm pumps type DP can transfereasy to fluidise powders economically and almost dust-free. The world�s largest air operated diaphragmpump (DP 125) was developed in co-operation with industry and has been successfully used over severalyears on special applications providing high and gentlepumping powder.

In many industrial areas powder pumps are used for rapidunloading of re-usable containers or vehicles, for whichboth mobility and transfer time are essential cost factors.

For the transfer of powder the pumps are, depending ontype, equipped with Y-shaped suction and discharge manifolds as standard, in order to significantly improve thepowder flow. Laboratory tests revealed that this kind oftransfer did not cause any damage or product changes tothe powder.

Pumps of type DP are equipped with an additional airationvalve on the suction side inlet, to enable infinite regulationof the required vacuum. On request the powder pumpscan be delivered with a complete fluidisation facility.

DEPA air operated diaphragm pumps type DB is the latestgeneration of high-pressure pumps. Industry�s requirementsfor various pressure ranges (13, 16 or 21 bar versions) andhigh pumping capacities in the low pressure range (up to 7bar) were taken into consideration during the developmentof these pumps.

These high-pressure pumps are available in three differentsizes made of stainless steel or cast iron. Because of thehigh pressures occurring during operation these pumps aredesigned with flanged clamping. DB models are fitted withappropriate safety valves to avoid any pressure increaseabove the design discharge pressures.

All high pressure pumps are fitted with a separate boosterunit, which can be directly mounted to the pump or installedseparately. If compressed air at a suitable pressure is available, the pumps can, of course, also be operated without the booster.

Compared with cast iron pumps, which are successfully inuse for many years, these pumps achieve the same pumping performance. From a maximum supply pressure of7 bar the booster increases the pressure up to a 3:1 ratio.

DP 50 DP 80 DP 125Type (2�) (3�) (5�)

FA ● ● ●CA ● ● -SA - - ●SL - ● -

(Aluminium)

(Cast iron)

(Stainless steel 316L)

(Stainless steel)

DB 25 DB 40 DB 50Type (1�) (1 1/2�) (2�)

CA ● ● ●SA ● ● ●

(Cast iron)



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Pu mps

Drum pumpsType DF

Dual action pumps Type DZ

Main applications:



● Waste disposal technology

● Furniture industry

● Heavy industry

Main applications:

● Surface treatment technology

● Waste water technology

● Printing industry

● Paper processing

● Furniture industry

DEPA air operated diaphragm pumps type DF for theemptying of drums and containers provide an economicaland wear resistant alternative to other pumping systems.

In order to handle a wide range of fluids the type DF 25pumps, are available in three different fluid housing material options i.e. aluminium, stainless steel and polypropylene.

The drum pump can be quickly mounted on the drum to beemptied. The required drum adapter is supplied with thepump.

Drums can be completely emptied by using the suppliedsuction pipe. All DEPA pumps are resistant against dryrunning and infinitely adjustable within their performanceenvelope.

Many drum pumps can be combined with DEPA specialaccessories and are used by the industry as dosing or filling stations.

DEPA air operated diaphragm pumps type DZ are mainlyused in the textile and paper processing industry.

These dual action pumps are able to transfer two differentmedia independently and simultaneously.

Due to separate connections on the suction and dischargeports the two pumped media are isolated from each otherand therefore will not mix.

A typical application in the printing and paint industry is thesimultaneous supply of different viscous media to the production line. Amongst the benefits achieved are economy and environmental protection.

All these pumps can be combined with DEPA accessories.

DZ 15 DZ 25 DZ 40 DZ 50 DZ 80Type (1/2�) (1�) (1 1/2�) (2�) (3�)

FA ● ● ● ● ●SA ● ● ● ● ●

(Aluminium)

(Stainless stell 316L)

DF 25Type (1�)

FA ●SA ●PP ●

(Aluminium)


(Polypropylene)


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DEPA-Air Operated Diaphragm Pu mpAccessories / AutomationPulsation dampner Mobile units

PassiveActive

Diaphragm monito-ring system

DEPA air operated diaphragm pumpscan be equipped with an activepulsation dampner installed immediately after the pump. Thisreduces any remaining pulsations toa minimum.

Active pulsation dampners are particularly suitable for intermittentoperating conditions and, due to theirintegrated control, they automaticallyadjust to the optimal degree of dampning. A separate air supply isrequired.

As with the air operated diaphragmpumps one of the focal points duringdevelopment of the pulsation dampners was the modular use ofcommon components.

Pulsation dampners require minimummaintenance and are, depending onthe application of the pump, availablein the same housing and diaphragmmaterials as the pump.

As an alternative to the active pulsation dampner DEPA air operateddiaphragm pumps can also be supplied with a passive pulsationdampner installed directly after thepump. This type is particularly suitablefor continuous operating conditions.

Passive pulsation dampners are available with different housing material, painted steel, polypropyleneor stainless steel and, depending onthe design, are fitted with an internaldiaphragm. Subject to the pump size,the most suitable pulsation dampnercan be selected, to minimise pulsations.

DEPA air operated diaphragmpumps can be supplied as mobileunits. Trolleys are of paint finishedsteel or extra-bright stainless steelconstruction.

They can be fitted with a handle,two or four castors, and collectingbasin etc., as reqired by the customer.

DEPA air operated diaphragm pumpscan be equipped with a diaphragmmonitoring system. This option isrecommended wherever chemicallyaggressive, environmentally hazardous or toxic media are trans-ferred.

The diaphragm monitoring system is available for conductive and non-conductive media as well as forEx-areas.

DL 15 DL 25 DL 40 DL 50 DL 80Type

FA ● ● ● ● ●CA - ● ● ● ●SA - ● ● ● ●SL ● ● ● ● ●UL ● ● ● ● -PP ● ● ● ● ●PL ● ● ● ● -PT ● ● ● ● -TL ● ● ● ● -

Fillingcontrol

DEPA air operated diaphragm pumpscan be used with an automatic fillingcontrol. The required pumped volumecan be programmed in litres. Thepump delivers medium until the setquantity is reached and is then shutdown.


19

Pu mps

Suction filters Suction pipes

Slow start air valve

Flanges, fittings,quick couplings

DEPA air operated diaphragmpumps series M can be fitted with asuction filter connected to the inletside for operation in slurry. Filtersare available made of steel or stainless steel for all pumps sizes.

DEPA air operated diaphragm pumpscan be fitted with a suction hose andvarious types of suction pipes tohandle liquid or powder media.

Depending on the application suctionpipes are available with or withoutaeration, in various lengths in steelor stainless steel.

For pumps, which are not primed,the un-throttled opening of the compressed air supply can causeextreme loads on housing materialsand diaphragms resulting in a highwear rate. These pressure shockscan be reduced to a minimum by aslow and gradually adjustable pressure increase. The slow start airvalve can be used with all DEPApumps.

For DEPA air operated diaphragmpumps a wide range of suitable couplings, flanges and fittings areavailable.

Depending on the type of pump thesecan be supplied in aluminium, redbronze, stainless steel or plastic.

DEPA compressed air operated diaphragm pumps can be fitted withsuitable suction and discharge hoses.These are available in nominal sizeranging from 1� to 4� diameter. Theycan be connected with quick couplings etc. All hoses are pressuretested before despatch.

The product range includes standardspiral hoses with plastic or steel reinforcement, hoses for chemicalapplications and hoses approved forfood applications.

Suction anddischarge hoses

For the complete accessoriesrange separate data sheets areavailable.

Air Service units

If only poorly treatedcompressed air is

available DEPA air operated diaphragm

pumps should be fitted withan upstream service unit. The specialfilter in service unit almost completelycleans the compressed air from residues of water and oil droplets.The integrated pressure regulatormaintains the working pressure at analmost constant level, independentlyfrom pressure fluctuations in themains air supply.


depa-air operated diaphragm pumpfile.yizimg.com/2623/20066314418320958507.pdf · resulting...

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