Walchem pumps for metering offer a pump for most applications. Featuring four great Walchem pump series, EWP 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 up to 250 PSI (17 bar) E-Class has a pump that will fit most any industrial, municipal, or agricultural water or wastewater application. The Walchem pumps entire E-Class pump line is backed with a comprehensive 2-year warranty that covers the entire pump, including the liquid end and diaphragm.. Walchem pumps not only offer high quality pumps but at an economical price. If PFC does not have the pump in stock the general lead time for Walchem pumps is 2 weeks.
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Walchem Pump EWP Series
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- The EWP Series pumps offer flow rates up to 6.7 GPH (25 1/h)
Pressure capabilities reaching 300 PSI (20 barOperating at 360 strokes-per-minute, EWP Series pumps provide high resolution chemical feedThe EWP-R expands proportional control with programmable analog, pulse with Multiply or Divide, Batch, or Interval Batch. Additional control features include external AUX, PRIME, Pre-STOP and Interlock, plus an alarm output relay with pump status.The EWP series feature a removeable secondary base that can be used to mount the pump either on a flat surface, or on a wall.
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Walchem Pump EHE Series
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- Outputs up to 20 GPH (75 LPH) and pressure up to 150 PSI (10 bar)
- High speed performance at 360 SPM provides high resolution chemical feed.
- Dual bearing support ensures proper axial movement to extend the life of the diaphragm
- Dual check valve assemblies in both suction and discharge fittings guarantees fast priming and reliable perfomance
- High compression ratio ensures proper feed
- Microprocessor – based control circuitryOperator adjustment of pump speed and external input settings
- Pump can be set to divide (accumulate) pulses by a factor of 1 to 999
- Programmable 4-20 mA input
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Walchem Pump LK Series
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- Maximum capacity of 114 GPH (432 l/h) and maximum pressure of 225 PSI (1.5 MPa).
Ideal for chemical feed applications in a wide range of fields, including water treatment, chemical process, agriculture, mining and paper.
Accurate and reliable stroke setting with a micrometer dial of the spring back stroke adjustment mechanism.Lockable mechanism is adjustable from 10 to 100%.Dual-cam drive with a built-in worm gear type speed reducer.Provides maximum wear resistance in continuous operation over long periods of time.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.
Walchem Pump Large LK Series
The Iwaki LK Series metering pumps are motor-driven, mechanically-actuated diaphragm metering pumps. This largerLK Series can achieve outputs up to 856 GPH (3240 l/h) and maximum pressures of 220 PSI (1.5 MPa). The LK Series is ideal for chemical feed applications in a wide range of fields, including water treatment, chemical process, agriculture, mining and paper.
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High Performance & Versatile Design – The LK series has a discharge accuracy (repeatability) that is within ±2% FS.
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Reliability has been enhanced with the improvement in the linearity of the stroke and the discharge ratio of each stroke.
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Drive- The heart of the LK is the dual-cam drive with a built-in worm gear type speed reducer. This compact & rigid mechanism, provides maximum wear resistance in continuous operation over long periods of time.
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The LK-A, LK-B, and LK-C series pump are designed to be fit with IEC general-purpose, vertically mounted TEFC outdoor-use motors, providing different voltage and enclosure options, including VFD-ready and explosion-proof designs.
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Walchem Pump IX Series
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- Motor control adjusts the discharge and suction speeds to meet a full and accurate turndown ratio of 750:1 (300 L/h to 200 mL/h)
- Maintains accurate flow rates allowing a low cost, mechanically-driven diaphragm pump to achieve a high accuracy of ±1%.
- Helical gears and return springs reduce power consumption by up to 70% compared to conventional motor-driven mechanical diaphragm metering pumps.
- Fixed stroke length maintains a high compression ratio in each stroke resulting in fast priming and no air-lock at any flow rate.
- Controller position can be ordered in 6 positions for operator convenience and ease of use after installation.
Walchem Pump HRP Series
Designed specifically for OEM applications, the HRP pump has been sized for easy integration into many types of systems.
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- High Resolution/Ultra compact 4″ x 2.5″ x 3.5″
Digitally controlled stroke rate 0 to 720 SPM - IP65 waterproof and dustproof design
DC voltage operation - PVDF pump head with ceramic balls and FKM elastomer
4 types of control:Pulse
4-20 mA
1-5 VDC
Start/StopWalchem offers many accessories to add to your metering pump. Walchem’s accessories are carefully designed and selected for compatibility with our Walchem pumps to enable our customers to provide a complete system.
Walchem Flowmeters
WFM Flowmeters utilize the multi-jet principle to provide dependable, accurate performance. They are available in ¾, 1, 1½ and 2” NPT pipe sizes. A pulse output provides a signal to a controller or to a metering pump for proportional chemical feed. A two-wire reed switch or three-wire Hall effect sensor may be specified.
Walchem Posi-Flow
Feed verification has never been better! The PosiFlow® Sensor will verify that your metering pump is truly moving liquid into the system and has not lost prime.
Provides accurate and non-intrusive flow verification.
No moving parts in the sensor eliminates any concern of plugging, leaking or jamming of the flow path or sensing mechanism.
Sends out a signal with every stroke as long as there is liquid pumping against pressure.
EW-Y Series pumps take the PosiFlow signal directly, monitoring the feedback against pump operation.
Install PosiFlow® on the discharge side of the metering pump, and connect to the digital input option card of the WebMaster.Supplies a contact closure to the WebMaster every time the metering pump pulses and the sensor detects fluid movement.
Controller can also use a programmable volume-per-stroke value to totalize the volume of chemical feed.
Controller will send an alarm if the pump should be operating but no flow pulses are received. -
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Walchem Anti Syphon / Back Pressure Valve
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- Rugged valves are constructed from PVC, PP, PVDF, or Stainless Steel components to ensure long life and reliability.
- Spring loaded PTFE faced diaphragms provide positive discharge pressure to stabilize pump output and prevent syphoning.
- All valves are screw adjustable from 0 to 150 psi standard.
- Ideal for LK and EHE metering pumps, but can be used with any metering pump requiring back pressure adjustment or anti-syphon protection.
Walchem Multi Function
Walchem’s multi-function valves provide anti-syphon, back pressure and pressure relief for your 10, 15 and 20 size E class metering pumps. These valves will prevent syphoning when pumping downhill and will increase accuracy and repeatability in applications with little or no system pressure
Walchem Paddle Wheel
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- Impeller-type insertion meters designed for use in pipe sizes from ½” to 6”.
- High quality jewel bearings provide accurate performance across the entire flow range.
- Hall effect sensor output can be connected directly to your controller or metering pump.
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Walchem Calibration Column
Walchem Calibration Column Specs
Provide verification of metering pump output.
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- Constructed from clear PVC, Glass, or PP with graduations in milliliters and GPH.
- Available in easy clean versions with vented (npt) removable top, and in sealed versions with vented (npt) non-removable top.