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Reciprocating metering pumps

Survey of the modular system

Function of the LEWA ecoflow drive elements

Function of the M900 pump heads

Summary and customer advantages

T echnik

LEWA ecoflow The innovative metering pumps

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Photos

LDE

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Photos

LDE

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Photos

LDE

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LDE 4

Photos

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LDC3

Photos

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Reciprocatingmetering pumps

T und V

LEWA ecoflow The innovative metering pumps

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Reciprocatingmetering pumps

Oscillating metering pumps

Drive element: Converting rotary

movement to a reciprocating

movement

Pump head: Metering fluid

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Pressure firm pump characteristic

flo

wra

te

pressure

positice displacement pumps

rotary positive displacement pumps

centrifugal pumps

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Vh Vh Vh

time t

flo

wra

te Q

Pulsating flowrate

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frequency n

fow

rate

Q

Q = k1*n

stroke length h

flo

wra

te Q

Q = k2*(h-h0)

h0

limiting stroke length h0

Adjusting the flowrate

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Survey of themodular system

T un V

LEWA ecoflow Innovative Metering Pumps

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Drive elements and pump heads

Drive elements LDB

LDC

LDD

LDE

Pump heads M900

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EK

EL

EH

LDB

LDC

LDD

LDE

Ecoflow replaces modular

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Guidelinie 94/9/EG ATEX

absolutely suitable for group II, category 2 (zone 1), gas group IIC, temperature class T1-T4

Special features in design

standard version provided with earthing terminals

parts made of plastic are hard to charge

Temperature rise tested (by worm shaft sealing, by drive element)

no maintenance of couplings between elements

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LEWA ecoflow drive elements

LEWA ecoflow Innovative metering pumps

T H E T E C H N O L O G Y A D V A N T A G E

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Function of stroke adjustment

movie

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Multiplex pumps

Common oil bath of multiplex pumps

less wear parts

simple maintenance, meets ATEX-requirements

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Function of the M900pump heads in detail

T und V

LEWA ecoflow Innovative metering pumps

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First step: Starting point is the plunger pump

Function of the diaphragm pumps

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Second step: Installation of a diaphragm

Function of the diaphragm pumps

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Function of the diaphragm pumps

Third step: Diaphragm guide and support, replenishment valve

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Function of the diaphragm pumps

Fourth step: Pressure relief valve

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Function of the diaphragm pumps

Fifth step: Installation of a spring

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LEWA ecoflow M900

movie

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DPS: Diaphragm Protection System Diaphragm Protection System

New Diaphragm control PTFE- sandwich diaphragm with

Diaphragm condition monitor extraordinary safe pump head trouble-free start-up New diaphragm

with extended service life Diaphragm movement is stabilised

by overpressure in the hydraulic fluid No gas bubbles during suction stroke Higher suction lift capability,

comparable to plunger pump heads Higher stroke frequencies are possible (theor. 288min-1)

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M900 diaphragm

New diaphragm technology(patent pending)

Longer diaphragm service life due to central guide of diaphragm

Simple screwing-on of diaphragm

Diaphragm condition monitor as standard

movie

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Diaphragm mounting

The diaphragm can easily be screwed onto the diaphragm guide.

Automatic venting of sandwich diaphragm:diaphragm is filled with grease as a standard

Assembly Disassembly

movie

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min. 1 baroverpressurein the hydraulic chamber

Time - Pressure - Curve

Pressure

Timefluid chamber

hydraulic chamber

pressure valve closes

suction valve opens closes

pressure valve opens

replenishment valve open

Compression

Decompression

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Pressure relief valve opens

Example of failure: Pressure line closed

movie

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Cavitation in thefluid chamber;the pressure decreases up to the vapour pressure of the metered fluid

min. 1 bar abs. overpressure in thehydraulic chamber

no gas bubbles in the hydraulic chamber

Example of failure: Suction line closed

movie

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NPSHR of LEWA pumps

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Suction features, NPSHR and min. suction pressure

p i inlet pressure loss (NPSHR)

0.4 bar a : limit pressure of hydraulic fluid

p H pressure losses in the hydraulic chamber, flow losses, diaphragm rigidity

pSFmin p i + p H + 0.4 bar a pSFmin p i + p Tfl

p i inlet pressure loss (NPSHR)

p Tfl vapour pressure of metering fluid

Diaphragm pump heads competitors Diaphragm pump heads M900

The NPSHR will not change but the minimum required suction pressure

pSFmin p i + p Tfl or

pSFmin min. suction pressure pSFmin min. suction pressure

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Arguments creating confidence

Diaphragm technology is based on the experiences with the proven M700 and LEWA ecodos series

Clamping technology is based on the experiences with the PTFE high-pressure pump heads M800

LEWA ecoflow has been tested successfully for more than 500.000 hours

The diaphragm springs have been successfully tested for more than 40.000 hours operation

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Summary and customer advantages Simple start the pump without

diaphragm positioning Max. pressure range: up to 400bar High suction lift capability,

allows pumping out of a vacuum Long service life of diaphragms Simple maintenance High suction pressure safety Wide turndown range

by stroke speed and length Full diagnostic capability Simple spare parts stocking at

customers with a high share of identical parts