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T H E T E C H N O L O G Y A D V A N T A G E
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
T H E T E C H N O L O G Y A D V A N T A G E
2
Photos
LDE
T H E T E C H N O L O G Y A D V A N T A G E
3
Photos
LDE
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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Photos
LDE
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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LDE 4
Photos
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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LDC3
Photos
T H E T E C H N O L O G Y A D V A N T A G E
7
Reciprocatingmetering pumps
T und V
LEWA ecoflow The 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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Reciprocatingmetering pumps
Oscillating metering pumps
Drive element: Converting rotary
movement to a reciprocating
movement
Pump head: Metering fluid
T H E T E C H N O L O G Y A D V A N T A G E
9
Pressure firm pump characteristic
flo
wra
te
pressure
positice displacement pumps
rotary positive displacement pumps
centrifugal 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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Vh Vh Vh
time t
flo
wra
te Q
Pulsating flowrate
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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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
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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Survey of themodular system
T un V
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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Drive elements and pump heads
Drive elements LDB
LDC
LDD
LDE
Pump heads M900
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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EK
EL
EH
LDB
LDC
LDD
LDE
Ecoflow replaces modular
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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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
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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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
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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Multiplex pumps
Common oil bath of multiplex pumps
less wear parts
simple maintenance, meets ATEX-requirements
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 the M900pump heads in detail
T und V
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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First step: Starting point is the plunger pump
Function of the diaphragm 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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Second step: Installation of a diaphragm
Function of the diaphragm 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 the diaphragm pumps
Third step: Diaphragm guide and support, replenishment valve
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 the diaphragm pumps
Fourth step: Pressure relief valve
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 the diaphragm pumps
Fifth step: Installation of a spring
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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LEWA ecoflow M900
movie
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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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)
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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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
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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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
T H E T E C H N O L O G Y A D V A N T A G E
29
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
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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Pressure relief valve opens
Example of failure: Pressure line closed
movie
T H E T E C H N O L O G Y A D V A N T A G E
31
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
T H E T E C H N O L O G Y A D V A N T A G E
32
NPSHR of LEWA 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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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
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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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
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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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