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  • LEWA International :: Technologies
    LEWA spare parts service LEWA 2nd market Competence Why LEWA References Top Products Efficient pumps LEWA R D Important patents Certificates Terms Conditions Technologies Pump head technology Condition Monitoring System Intellidrive Mechatronic System Pulsation simulation Smart control technology Diaphragm monitoring system Company LEWA Group Corporate Responsibility News Press portal Media Center Exhibitions Events History Job offers Vocational education Contact Contact LEWA worldwide Inquiry sheet Imprint Privacy LEWA internal Downloadcenter Technologies LEWA is the technology leader in diaphragm metering pumps Because we are continually expanding our competitive advantage we can also disclose a lot about the technologies behind it Experience here what make our products so successful Technologies Pump head technology Condition Monitoring System Intellidrive Mechatronic System Pulsation simulation Smart control technology Diaphragm monitoring system Quickfinder LEWA pump head technology LEWA offers the most advanced diaphragm metering pump head technology in the world On the following pages you will find detailed technological descriptions of our diaphragm pump heads M500 M900 M800 M200 M400 as well as our piston pump heads K110 K210 LEWA Condition Monitoring System This patented system is used to monitor the most important functions of the pump head continuously LEWA CMS lowers lifetime costs increases system availability from preventative to condition oriented service without increasing the risk of a pump failure LEWA intelldrive Using the highly dynamic servomotor you can model the stroke of the pump to the requirements of your system and your process The stroke adjustment normally required for metering pumps can then be omitted Infinitely variable stroke times permit the metering pump to handle new application areas with special fluid kinematics Pulsation simulation Especially with oscillating positive displacement pumps interactions with connected pipelines and system parts must be taken into consideration We inspect your installation considering the complexities of the system the kinematics and number

    Original URL path: http://www.lewa.sg/en/competence/technologies/ (2013-01-29)
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  • LEWA International :: Pump head technology
    reservoir for the hydraulic fluid and is pressureless The multi layer diaphragm also called sandwich diaphragm separates Chambers A and B At the same time it is used to seal Chamber A and B away from the atmosphere This is a static seal so the pump head is considered hermetically sealed The condition of the multi layer diaphragm is permanently monitored Chambers B and C are separated by a piston and several hydraulic valves The hydraulic fluid between the piston and diaphragm transfers the displacement movement of the piston to the metering fluid The diaphragm is only used here as a separating element it transfers no forces The process valves open through the pressure change in the pump head and close by the gravity of the moved valve body or by spring force Three valves and the diaphragm spring are required for the hydraulic system hydraulic poppet valve pressure relief valve ventilation valve Diaphragm spring With the hydraulic poppet valve the pressure relief valve and the diaphragm spring ensure the complete fail safety of the pump in all possible fault situations The ventilation valve ensures a continuous discharging of possible existing gas bubbles in the hydraulic system and thus optimizes the metering accuracy The hydraulic poppet valve increases leaks at the end of the suction stroke as soon as the pressure drops under the set opening pressure Hydraulic leaks are completely normal and occur at the piston seal the ventilation valve all valve seats and seals of the hydraulic drive system The diaphragm spring ensures that there is always a pressure in Chamber B at least 1 bar higher than the pressure in Chamber A The hydraulic poppet valve therefore operates on a pressure controlled basis Only if the diaphragm is in the rear dead center is the spring force released and the pressure in the hydraulic chamber can drop to the set pressure of the hydraulic poppet valve This reliably prevents the accidental or excessive increase in leakage under all operating conditions At the same time this design permits the diaphragm to vibrate freely forward in the working area The pump head is thus excellently suitable for very severe operating conditions such as suspensions or very low suction pressure The pressure relief valve protects the entire pump from overloading In case of a breakdown on the discharge side of the pump it can be temporarily loaded During the transfer pumping the hydraulic fluid is pumped via the pressure relief valve from Chamber B into Chamber C and afterwards suctioned into Chamber B through the hydraulic poppet valve During this the hydraulic fluid foams somewhat The foam restricts the temperature increase during transfer pumping and reforms again after interruption during operation via the ventilation valve The opening pressure of the pressure relief valve is indicated in the technical data sheet The ventilation valve is placed at the highest point The permanently set low leakage rate ensures that gas bubbles which can occur during operation see transfer pumping are reliably transported into Chamber C Diaphragm monitoring Every M9 pump head is equipped with a sandwich diaphragm and monitoring system The space between the diaphragm in normal operation is pressureless If the diaphragm is damaged fluid conveyed fluid or hydraulic fluid permeates the space This leads to a pressure increase which is used for the detection of the diaphragm damage Pump head M800 General Description LEWA Series M800 diaphragm pump heads are principally designed as the pump heads of the proven M500 series These are pump heads with freely oscillating PTFE diaphragm and diaphragm position control via a control gate valve The special feature of this series is the very high permissible operating pressure Pump heads of the M800 series can be used for discharge pressures up to 1000 bar One of the greatest challenges for the development of high pressure pump heads is the diaphragm clamping system Due to the design of the patented solution developed by LEWA the clamping system of the M800 does not breathe during the discharge stroke This is implemented by an indentation that is formed by a circumferential flexible lip in the area of the diaphragm clamping system This geometry calculated using the finite element method FEM leads to a completely different movement behavior of the clamping system specifically there is no negative axial movement of the two halves of the fixation to each other With this modified movement behavior the PTFE diaphragm can have a long lifetime even at very high pressures With the M800 pump head LEWA is the only pump manufacturer that operates with a PTFE diaphragm at pressures between 400 and up to 1000 bar Advantages and Benefits Extremely high operating pressure and simultaneous use of freely vibrating PTFE diaphragm Cost effective option in high pressure range due to lowest possible material use smaller outer diameter compared to metal diaphragm pump heads no perforated plates Hermetically sealed no leaking of conveyed fluid or hydraulic fluid High metering accuracy Long diaphragm lifetime Secure against misuse and against impermissible operating conditions as a result outstanding system availability Universal applications through freely vibrating diaphragm not sensitive to contamination or particles in the conveyed fluid Also suitable for suspensions Continuous diaphragm monitoring allowing downtime to be planned Maintenance free piston seal using polished bushings Technical Data Type Pressure max Flow rate per pump head max Temperature Viscosity max M800 1 000 bar 1 m³ h 10 60 C 100 000 mPas Function see tab M500 The M800 is divided into 3 chambers Chamber A the fluid is conveyed through this Chamber B is the hydraulic pressure chamber and contains the hydraulic fluid Chamber C used as reservoir for the hydraulic fluid and is pressureless The multi layer diaphragm also called sandwich diaphragm separates Chambers A and B At the same time it is used to seal Chamber A and B away from the atmosphere This is a static seal so the pump head is considered hermetically sealed The condition of the multi layer diaphragm is permanently

    Original URL path: http://www.lewa.sg/en/competence/technologies/pump-head-technology/ (2013-01-29)
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  • LEWA International :: Condition Monitoring System
    service LEWA 2nd market Competence Why LEWA References Top Products Efficient pumps LEWA R D Important patents Certificates Terms Conditions Technologies Pump head technology Condition Monitoring System Intellidrive Mechatronic System Pulsation simulation Smart control technology Diaphragm monitoring system Company LEWA Group Corporate Responsibility News Press portal Media Center Exhibitions Events History Job offers Vocational education Contact Contact LEWA worldwide Inquiry sheet Imprint Privacy LEWA internal Downloadcenter Quickfinder Condition monitoring systems from LEWA With the LEWA Condition Monitoring System LEWA CMS the lifetime costs are lowered and the system availability increases From preventative to condition oriented service without increasing the risk of a pump failure Because LEWA CMS not only monitors the fluid valves but rather the entire function of the pump head continuously and automatically The most important functions of the pumps are continually monitored with the 2003 patented system For this LEWA combines the signals of a structure borne sound sensor a pressure transducer in the hydraulic part of the pump head and locator on the pump motor The combined evaluation of these signals facilitates a very detailed condition monitoring of the pump Almost 90 of all possible sources of error can be detected in this manner The pump diagnostics is professionally supported and service work can be planned Advantages Benefits Flexible in application Suitable for a broad spectrum of metering and process pumps in a wide range of fluids and operating parameters Connection to the process control system Ethernet RS 485 Can be retrofitted onto existing LEWA pumps already installed Application for single and multiple head machines Application in Ex zones possible Comfortable to operate Continuous automatic signal evaluation Intelligent error recognition with plain test messages from expert knowledge of electronics Differentiation in prealarm and main alarm Efficient service and maintenance Pump parts must only be replaced when

    Original URL path: http://www.lewa.sg/en/competence/technologies/condition-monitoring-system/ (2013-01-29)
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  • LEWA International :: Intellidrive - Mechatronic System
    well suited for high viscosities due to delayed suction stroke Nearly pulsation free volume flow due to the use of two synchronized intellidrive pumps Very well suited for precise filling jobs Very suitable for use as a metering pump in fluid chromatography LEWA combines what has been separated until now Pumps with frequency controlled standard drives and separate servo drive for stroke length adjustment can now be combined into a single unit A partial stroke mode takes over the function of the stroke length adjustment for adjustment of the volume flow The pump piston does not move in the discharge stroke phase completely to front dead center depending on the desired volume flow the piston stops beforehand and moves back into the suction stroke The innovation the angular speed can be changed during a revolution that is also within the discharge and or suction phase Thus we achieve a variable change of the stroke speed so that the fluid kinematics can be matched exactly to the requirements of your process The duration of the suction stroke for example for high viscosity media can be longer than the discharge stroke High viscosity media LEWA intellidrive can handle different suction and discharge stroke frequencies When conveying high viscosity media there are often high inlet pressure losses during suction of fluid into the pump s working chamber With conventionally operated pumps the time for suctioning a stroke volume is same as the time to push it out but actually the flow speed when suctioning should be as small as possible To solve this problem pumps with large nominal widths have conventionally been used i e pumps with large flow cross sections and thus smaller flow speed These pumps are frequently over dimensioned since they are normally designed for significantly larger material flows of normal viscosity The solution LEWA intellidrive masters different suction and discharge stroke frequencies The high viscosity fluid can be suctioned slowly with less pressure loss via the smaller valve nominal width and then quickly fed into the discharge stroke to the process High viscosity fluids or fluids with high vapor pressure no longer require slow conveying pumps with over dimensioned heads A slower low loss suction stroke can be time compensated with a fast discharge stroke In this manner the pump head remains as small as is required to convey water like fluids Combining two media in one pump Using LEWA intellidrive controlled valves on the suction side of a pump head two fluids can be conveyed To do this the suction stroke of the drive is distributed over the angle of rotation corresponding to the volume ratio of the two media In front dead center the valve opens for fluid 1 and sucks it into the pump head When reaching the calculated angle of rotation the motor stops and the valves switch over Now the pump sucks fluid 2 in the pump head In the rear dead center the valves close After restart of the motor the pump pushes

    Original URL path: http://www.lewa.sg/en/competence/technologies/intellidrive-mechatronic-system/ (2013-01-29)
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  • LEWA International :: Pulsation simulation
    head technology Condition Monitoring System Intellidrive Mechatronic System Pulsation simulation Smart control technology Diaphragm monitoring system Company LEWA Group Corporate Responsibility News Press portal Media Center Exhibitions Events History Job offers Vocational education Contact Contact LEWA worldwide Inquiry sheet Imprint Privacy LEWA internal Downloadcenter Quickfinder Pipeline and installation calculation based on a pulsation study Especially with oscillating positive displacement pumps interactions with connected pipelines and system parts must be taken into consideration We inspect your installation considering the complexities of the system the kinematics and number of cylinders of the pump as well as the stroke frequency range and the properties of the fluids Pulsation study We perform an analytic study with our software PumpDesign This provides information on Mass pressure fluctuations caused by the acceleration forces of the pump Volumetric pump efficiency Inlet pressure loss Minimum suction flange pressure Pressure loss and pressure pulsation in pipelines Cavitation and overload Resonance at critical speeds We are the only pump manufacturer worldwide that can also perform numeric simulations and test API 674 criteria This will give you exact evidence without going to external institutions on Dynamic processes in complex pipeline systems e g parallel operation of pumps Pressure amplitudes These analyses are used for optimization of pulsation damping and pipeline dimensioning In this way we prevent typical problems by exact calculation such as Cavitation Vibrations Fatigue damage to pipelines and components The results of the study are summarized in corresponding documentation With the installation inspection from LEWA you can already know during the planning stage that the entire system pump with pipeline will work reliably Advantages Benefits Reduced investment costs based on optimal dimensioning and positioning of the components Resistance and long service life of the entire system Analysis of system structure Based on your jobs we discuss with you the

    Original URL path: http://www.lewa.sg/en/competence/technologies/pulsation-simulation/ (2013-01-29)
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  • LEWA International :: Smart control technology
    monitoring system Company LEWA Group Corporate Responsibility News Press portal Media Center Exhibitions Events History Job offers Vocational education Contact Contact LEWA worldwide Inquiry sheet Imprint Privacy LEWA internal Downloadcenter Quickfinder LEWA smart control controller The compact intelligence for all metering flow controls Based on the systematically collected experience with flow controlled metering systems LEWA designed a controller that meets all the important requirements on the brain of metering systems The control unit continually compares the flow rates using a flowmeter with the target values defined by the user or via PCS If there are deviations from this continuous plausibility test corrective measures are implemented Since the controller saves the characteristic curves of different pumps deviations without significant overshooting can be controlled faster and more precisely Function Simultaneous control of up to two connected control loops In addition to a single pump with one metering line multiplex pumps with up to two metering lines can also be controlled Many displays and overviews can be selected from while the operation is running For example instantaneous values such as target value and actual value but also process key values such as deviation in pump efficiency pressures temperatures or pump wear can be monitored and displayed Password protected software Communication via analog signals 4 20mA or optional bus systems such as Profibus and Profinet For the basic control LEWA installs a Siemens control system of the S7 1200 series in combination with operator panels of the KTP series Maximum installation Two pumps and two electric stroke adjustments Process examples Control of the metering flow Specification and maintenance of a continuous mass or volume flow Batch metering Filling or refilling processes of an adjustable metering quantity X e g topping up to fill level e g tank chemical metering of a specific quantity Manual

    Original URL path: http://www.lewa.sg/en/competence/technologies/smart-control-technology/ (2013-01-29)
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  • LEWA International :: Diaphragm monitoring system
    LEWA 2nd market Competence Why LEWA References Top Products Efficient pumps LEWA R D Important patents Certificates Terms Conditions Technologies Pump head technology Condition Monitoring System Intellidrive Mechatronic System Pulsation simulation Smart control technology Diaphragm monitoring system Company LEWA Group Corporate Responsibility News Press portal Media Center Exhibitions Events History Job offers Vocational education Contact Contact LEWA worldwide Inquiry sheet Imprint Privacy LEWA internal Downloadcenter Quickfinder Sandwich diaphragm with continuous monitoring LEWA diaphragm pumps are frequently used for metering or conveying very hazardous liquids leaks caused by diaphragm damage are not permissible For this reason LEWA already developed and patented a reliable and simple sandwich diaphragm technology with monitoring in 1968 Description function All LEWA diaphragm pumps with sandwich diaphragm feature two diaphragms lying on top of each other made of plastic or metal On the discharge stroke the membranes are connected mechanically positive locking with each other On the suction stroke they are hydraulically coupled via a fluid or grease film The exceptions are the M9 pump heads and LEWA ecodos pumps With these models the diaphragms are connected by a mechanical positive lock In both cases the space between the two diaphragms is pressureless in normal operation Only

    Original URL path: http://www.lewa.sg/en/competence/technologies/diaphragm-monitoring-system/ (2013-01-29)
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  • LEWA International :: The LEWA Group
    applications of our customers Customers do not only benefit from our wide portfolio of pumps and systems but also complementary products of renowned corporate partners Creating Fluid Solutions We offer industry specific complete solutions from a single source and with the highest quality We support our customers even in the design phase of system engineering creating solutions for the economical and reliable handling of fluids Our many years of experience in international project management let us solve complex tasks LEWA comprehensive service supports the installed technology throughout its complete life cycle Corporate Responsibility Taking social responsibility this is what we at LEWA stand for We base our actions on our values Honesty Integrity Trust short LEWA H I T Efficient by nature The LEWA diaphragm technology enables the highest possible pump efficiency over the entire control range Our history A family business develops into an international group many milestones prove it From modest facilities in Leonberg into the big wide world The LEWA success story started in 1952 can be described just that way The first steps were anything but easy for the founders Herbert Ott and Rudolf Schestag But their strict requirements for themselves and their products soon led to recognition on the market Two decisive factors were high product quality and focus on core competencies Precise metering and reliable conveying of fluids In just a few decades the little company in Leonberg has become a corporate group with international character After integration into the Japanese company Nikkiso Co Ltd in 2009 LEWA is continued on the road to growth An expanded product portfolio has strengthened the position of both companies on the world market Facts and profile Holding company NIKKISO CO LTD Tokyo Japan Headquarters LEWA GmbH Leonberg Stuttgart Area Germany Chairman of the supervisory board Toshihiko Kai

    Original URL path: http://www.lewa.sg/en/company/lewa-group/ (2013-01-29)
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