WALCHEM E-CLASS METERING PUMPS

Iwaki metering pumps are designed for a broad range of applications, and are manufactured to the highest quality standards that exceed even the toughest customer expectations

We carry a full line of Walchem metering pumps and accessories, including:

OVERVIEW

WALCHEM
Walchem and Iwaki joined forces to develop the most innovative and comprehensive metering pump product line in the world. Iwaki metering pumps are designed for a broad range of applications, and are manufactured to the highest quality standards that exceed even the toughest customer expectations. Their commitment to new product development and innovation has resulted in many industry firsts, including EK – the world’s first IP67 waterproof solenoid metering pump.

Featuring four great pump series, EZ, EW, EK, and EHE, E-Class metering pumps are powered by advanced microprocessor-based electronics and superior mechanical design. With capacities up to 20 GPH (76 l/h) and pressures to 250 psi (17 bar), E-Class has a pump that will fit most any industrial, municipal, or agricultural water or wastewater application. And, the entire E-Class pump line is backed with a comprehensive 2-year warranty that covers the entire pump, including the liquid end and diaphragm.


FEATURES

High Speed Performance

E-Class pumps operate up to 360 strokes-per-minute. Most competitive products operate at 180 SPM or less, resulting in slug feeding, accelerated diaphragm wear and poor feed control.

Superior Check Valve Performance

Dual Check Valve Assemblies in both suction and discharge fittings feature precision ball guides and tapered seats. Precise machining and molding of parts limit valve ball travel, ensuring that balls fully seat and seal with every stroke. This superior check valve design and performance guarantees fast priming.

High Compression Ratio

The compression ratio of a metering pump is important because it affects the pump’s ability to prime and vent. The compression ratio is improved when you reduce the dead volume of the pump head during operation. All E-Class pumps feature a very high compression ratio that ensures proper feed, especially with off-gassing products (e.g. Sodium Hypochlorite).

WALCHEM EW SERIES

OVERVIEW

Compact, powerful, and packed with a variety of innovative design features, EW is the flagship of the E-Class metering pumps. With output capacities up to 6.7 GPH (25.4 l/h) and a maximum pressure of 250 PSI (17 bar), there’s an EW model to enhance any chemical feed application.

IP65 Construction
The rugged Polyphenylene Ether (PPE) enclosure is equipped with a durable clear cover to protect the membrane switches and stroke control of the pump, which are mounted opposite the liquid end. The display utilizes a high temperature LCD that provides extra protection from heat and sunlight. A variety of liquid end combinations are available to ensure a perfect match for your specific application.


FEATURES

All EW series pumps come equipped with pulse, stop & pre-stop inputs in addition to stop & pulse output control. The EW-Y module also features:

Feed Accuracy
Powered by the E-Class 360 Stroke-Per-Minute technology, the EW has an incredible adjustment range of 1800:1 ensuring precise feed control for any application.

Pulse Input Control
Pulse input with multiply and divide features (1-9999). 12VDC output power supply for Hall Effect water meters.

Quick-Prime
Hold 2 keys down and pump runs at 100% of speed to prime quickly without adjusting application settings.

Keypad Lock-Out
Keypad functions can be locked out providing feed security and integrity from unwanted adjustments.

Easy Draw-Down Calibration
In the calibration mode the user only needs to start and stop the pump, enter the draw-down volume and the pump calibrates volume-per-stroke.

Flow Rate Display
After calibration, EW will display the flow rate. As long as stroke length is constant the pump will accurately display the volume of fluid being pumped. In cases where the pump is being controlled externally with a pulse, the pump will display and count down remaining flow based on the pulse input. Coupled with the PosiFlow Feed Verification, EW ensures proper feed for your application.

Feed Verification
EW is equipped with three pre-programmed modes for accepting the PosiFlow Feed Verification Sensor. The PosiFlow provides a pulse feedback to the pump to verify prime and proper feed. Depending on the mode, the user can program the pump to stop, continue operating and/or send an alarm based on the PosiFlow input.

WALCHEM EWN-R SERIES

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OVERVIEW

The EWN-R Series electronic metering pumps offer superior high speed dosing capability with more standard features. The flexibility of the EWN-R pump enable it be integrated into virtually any chemical feed application using a universal-voltage, digital controller with an expanded set of control features.

Superb valve performance and advanced solenoid engineering combine to make a highly precise pump for the most demanding applications. EWN pumps have outputs to 6.7 GPH (25.2 L/h) and a maximum pressure of 250 PSI (17 bar). The high speed of operation results in high resolution chemical feed and long service life. Quiet and compact, the EWN pump prime in seconds and hold prime reliably.

The controller in the EWN-R pump provides for flexible pump control including scalable Analog control, Digital Input with both Multiply and Divide capability, external stop control, or simple speed and stoke length control. Display of can be adjusted between flow rate units or % speed for easy-to-read output and enables quick adjustment. The controller is universal voltage so it can be used anywhere in the world.

IP65 Construction
The rugged Polyphenylene Ether (PPE) enclosure is equipped with a durable clear cover to protect the membrane switches and stroke control of the pump, which are mounted opposite the liquid end. The display utilizes a high temperature LCD that provides extra protection from heat and sunlight. A variety of liquid end combinations are available to ensure a perfect match for your specific application.


FEATURES

High Speed Performance
E-Series pumps operate up to 360 strokes-per-minute with adjustments in 1 spm increments, providing high resolution chemical feed. Adjustable stroke length further increases the ability to refine output, making the E-Series one of the most versatile solenoid metering pumps on the market.

Engineered Longevity
All E-Series pumps feature dual bearing support. The armature and shaft are supported with a bearing on each end, which ensures proper axial movement, enabling the E-Series to operate at 360 SPM while extending the life of the diaphragm.

Superior Check Valve Performance
Dual Check Valve Assemblies in both suction and discharge fittings feature precision ball guides and tapered seats. Precise machining and molding of parts limit valve ball travel, ensuring that balls fully seat and seal with every stroke. This superior check valve design guarantees fast priming and reliable performance.

Flexible Connections
A removable tubing insert provides flexibility of tubing sizes and eliminates twisting of the tubing during connection. A threaded insert can be used in place of the tubing adapter to easily convert any connection to NPT.

High Compression Ratio
The compression ratio of a metering pump is important because it affects the pump’s ability to prime and vent. The compression ratio is raised when you reduce the dead volume of the pump head during operation. All
E-Series pumps feature a very high compression ratio that ensures proper feed especially with off-gassing products (i.e. Sodium Hypochlorite).

WALCHEM EWN-Y SERIES + EFS SENSOR

OVERVIEW

Iwaki’s New EWN-Y Series Electromagnetic metering pump with the revolutionary EFS Flow Sensor provides precise flow monitoring, feedback and control.

The new EWN-Y electromagnetic pump combined with EFS flow sensor provides accurate real-time control and display of dosing rate.

Set point control allows the desired flow rate to be simply programmed into the pump. Through feedback from the EFS sensor, the pump constantly adjusts its speed to maintain the set dosing rate – even under changing temperature, viscosity or suction and discharge pressure conditions.

The EFS is mounted directly on the pump for accurate dosing rate measurement – all without any time-consuming calibration.


FEATURES

High Speed Performance
E-Class pumps operate at 360 strokes-per-minute, providing high resolution chemical feed. Most competitive products operate at slower speeds, resulting in slug feeding, accelerated diaphragm wear and poor feed control.

Engineered Longevity
All E-Class pumps feature dual bearing support. The armature and shaft are supported with a bearing on each end, which ensures proper axial movement, enabling the E-Class to operate at 360 SPM while extending the life of the diaphragm.

Superior Check Valve Performance
Dual Check Valve Assemblies in both suction and discharge fittings feature precision ball guides and tapered seats. Precise machining and molding of parts limit valve ball travel, ensuring that balls fully seat and seal with every stroke. This superior check valve design guarantees fast priming and reliable performance.

High Compression Ratio
The compression ratio of a metering pump is important because it affects the pump’s ability to prime and vent. The compression ratio is raised when you reduce the dead volume of the pump head during operation. All
E-Series pumps feature a very high compression ratio that ensures proper feed especially with off-gassing products (i.e. Sodium Hypochlorite).

WALCHEM EZ SERIES

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OVERVIEW

EZ Series with digital speed control offers precise chemical injection at a low cost. EZ has output capabilities up to 6.3 GPH (23.8 l/h) and a maximum pressure of 150 PSI (10 bar). The compact size and simple control make it ideal for OEM, water treatment, car wash and a variety of other applications.


FEATURES

Value
Effective, reliable performance is achieved through sophisticated engineering. EZ Series features an advanced microprocessor control with a turndown ratio of 360:1, making it an exceptional value. EZ is simple to operate with three pushbutton keys. The 360:1 turndown ratio provides unmatched versatility and results in high-resolution chemical feed and elimination of slug-feed effects.

VCompact Modular Design
The liquid end, drive, and electronics are modular, enabling economical repair or replacement of parts. The control module can easily be mounted in a remote location with the optional remote control cable assembly.

VInnovative Timer Control
The EZ-Timer module integrates Walchem’s EZB pump technology with a versatile programmable timer. Timed feed control can be programmed in daily or weekly cycles. The weekly schedules can be programmed in either 1 or 2-week cycles with a daily on-time. The daily timer can be set for multiple daily on-times. The EZ-Timer pump is a simple and effective way to automate chemical addition in small systems.

WALCHEM EK SERIES

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OVERVIEW

EK Series are the world’s first IP67 electronic metering pumps. This means that EK is the only pump in the industry guaranteed to operate submerged 3 feet under water for up to 30 minutes! Needless to say, EK Series pumps are ideal for wet or high humidity environments such as irrigation, agriculture, car wash or paper mill applications. EK models are available with output capacities up to 6.7 GPH (25.4 l/h) and a maximum pressure of 150 PSI (10 bar).


FEATURES

IP67 Waterproof Construction
By integrating the pump body into a one-piece design, sealing is easier and more effective. Both the drive and the controller are completely insulated from moisture or gas. A watertight clear cover protects the display, controls and stroke length adjustment. All circuit boards and electronic components have been completely encapsulated to prevent failure due to moisture or gas. The display utilizes a high temperature LCD that provides extra protection from long-term exposure to sunlight in outdoor applications. Construction of the EK Series pumps makes them perfect for indoor and outdoor applications where the pumps are frequently exposed to wash down.

Control Features
High speed and a 20% minimum stroke length allow EK Series to achieve an 1800:1 turndown ratio. The digital display and pushbutton speed control make setting EK pumps easy and precise. EK pumps come equipped with pulse input (1:1) control and also feature an external stop input that can be set to stop the pump from a normally open or normally closed contact. To maintain the IP67 rating, a proprietary connector is utilized that makes connection of the inputs simple, yet retains a watertight seal.

WALCHEM EHE SERIES

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OVERVIEW

EHE is the workhorse of the E-Class metering pumps. Superior mechanical design and quality of manufacturing merge to create a pump greater than the sum of its parts. EHE pumps have outputs up to 20 GPH (76 l/h) and a maximum pressure of 150 PSI (10 bar). Combining the EHE performance with a turndown ratio of 1800:1 yields one of the most versatile pumps on the market today. EHE Series is ideal for chemical feed applications in a wide range of fields, including drinking water, agriculture, and municipal/industrial wastewater.


FEATURES

Versatile

EHE pumps meet the demands of applications requiring accuracy over a wide output range. The 1800:1 turndown ratio provides the ability to accurately control a high capacity pump to very low outputs, without compromising accuracy. This enables oversize pumps to be installed in applications where output requirements fluctuate, or to accommodate future system growth.

Control
Microprocessor-based circuitry provides operator adjustment of pump speed and external input settings via
4-button keypad. EHE comes with digital and analog external mode control. The external digital input mode features pulse multiply and divide circuitry that is often used in flow proportional systems, such as with a flow meter contactor. The external analog input mode is a programmable 4-20mA input that provides scalable speed adjustment based on any analog signal

WALCHEM LK SERIES

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OVERVIEW

In a class by itself – LK is a motor-driven, mechanically actuated diaphragm metering pump with a maximum capacity of 114 GPH (432 l/h) and a maximum pressure of 225 PSI (15 bar). This expanded output range makes LK a perfect complement to the E-Class metering pump line.

LK pumps are ideal for chemical feed applications in a wide range of fields, including water treatment, chemical process, agriculture, mining and paper.


FEATURES

Stroke Adjustment
Accurate and reliable stroke setting is accomplished with a micrometer dial of the spring back stroke adjustment mechanism. This lockable mechanism is adjustable from 10 to 100%.

Drive
The heart of the LK is the dual-cam drive system with a built-in worm gear type speed reducer. The aluminum bronze worm gear and the tapered roller bearing provide efficient transmission of motor power to the pump. This compact and reliable design consists of a rigid mechanism that provides maximum wear resistance in continuous operation over long periods of time.

Motors
All of the standard models employ totally enclosed fan-cooled motors which are vertically mounted to save space. A variety of motor options are available, including explosion-proof and DC variable speed motors for external control by a 4-20 mA input signal.

ACCESSORIES

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OVERVIEW

Walchem is the leading manufacturer of metering pumps and analytical controllers for a wide variety of water treatment applications. To complete your system.

Walchem provides high quality accessories for cooling tower, boiler, potable water and wastewater applications. All of Walchem’s accessories are carefully designed and selected for compatibility with our pumps and controllers to enable our customers to provide a complete system solution.

  • Level switches to monitor tank levels
  • PosiFlow sensors to verify metering pump performance
  • Mounting brackets for metering pumps
  • Polyethylene storage tanks
  • Agitators with pump suction tube shield
  • Multi-function/tri-purpose valves to provide anti-syphon, back pressure and pressure relief for metering pumps
  • Paddle/wheel/multi-jet inline flow meters for proportional chemical feed
  • Calibration columns to verify metering pump output
  • Solenoid valves for cooling tower and boiler applications

FEATURES

Multi-Function Valves
Walchem’s Multi-function valves provide back pressure and anti-syphon protection in addition to standard venting functions for your 11, 16 and 21 size E Series metering pumps. These valves will prevent syphoning when pumping downhill and will increase accuracy and repeatability in applications with little or no system pressure.

PosiFlow Sensor
The PosiFlow sensor verifies that your metering pump is pumping and has not lost prime or had the discharge line cut. There are no moving parts in the sensor, which ensures long life and eliminates concerns of plugging or leaking. Available for 11, 16 and 21 sizes of E-class pumps.

Tri-Purpose Valves
Walchem’s economical Tri-Purpose Valves are three valves in one. Installed in one direction, the spring loaded PTFE faced diaphragm provides 30 psi of back pressure and anti-syphon protection. Installed in the opposite direction, it provides pressure relief that is adjustable from 30-125 psi.

ABOUT WALCHEM

Walchem is a leading manufacturer of on-line analytical instruments and electronic metering pumps. Their mission is to provide the integration of sensor, pump and electronic technologies for chemical control. They provide innovative solutions by integrating their instruments, sensors, fluid handling and extensive remote data communications technologies. Their success is driven by three tenets: advanced technology, quality customer service, and development of a superior work force.

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