OBL - Metering Pump - topline

Chemical dosing pumps are often the go-to solution for the accurate metering and transfer of fluids and substances. Often referred to as metering pumps, they are designed to deliver a defined volume of liquid to fluid streams or vessels at precise flow rates. Its pump setting can be altered to achieve the greatest metering accuracy when dosing is required. A perfect solution for handling the transfer fluids in fixed doses and other high viscosity applications, metering pumps are commonly used in chemical, cosmetic, water, and other industries where the ability to control flow rate is pivotal to operations. Browse some of the metering pumps we have available below or get in touch with our team in Singapore directly to discuss how we can meet your needs.


Capable of handling pressures up to 500 barg (7.252 psi) and flowrates up to 5.500 lt (1.210 gph) in single-head configuration, the plunger L series pump is ideal demanding industrial applications such as high-pressure boiler feed, catalysts dosing, scale and corrosion inhibitors dosing. Designed to meet the highest standards in the metering industry, this positive return plunger pump has a modular design that can house multiple heads to perfectly match your dosing needs. Separate oil reservoirs reduce the risk of oil contamination of process liquid and ensure steady and accurate output.


  • Flow rate from 0,2 to 5.500 l/h (0,04 to 1.210 gph)

  • Working pressure up to 500 barg or 7.252 psi

  • Chemical resistant coated cast iron enclosure

  • AISI 316 and PVC liquid end



The XL’s are rugged and very accurate single-block positive return hydraulic diaphragm pumps suitable for highly demanding 24/7 industrial applications. Built in full compliance with API675 and ATEX 2014/34/UE standards, these metering pumps house a relief valve, an air purge valve, and a mechanically actuated self-replenishing hydraulic system. These features combined, protect the pump and the whole dosing system from damages due to overpressures while granting proper chemical dosing under any circumstances.


  • Flow rate from 63 to 1500 l/h (13,8 to 330 gph)

  • Working pressure up to 20 barg or 290 psi

  • Chemical resistant coated cast iron enclosure

  • AISI 316, PVC, PP, PVDF, HAST C liquid end



The combination of unmatched metering accuracy, robustness and reduced footprint make the L X9 hydraulic double-diaphragm pump the ideal solution for a wide spectrum of industrial dosing processes in Singapore and internationally. The positive return mechanism (lost motion) grants a high reliability and durability, while the built-in safety and purge valve allow for a constant suction lift and chemical dosing under any working condition. Allowing for a multi-head configuration to match any dosing need, the L X9 pumps include a diaphragm rupture detection system and comply with the API675 and ATEX 2014/34/UE standards.


  • Flow rate from 0,4 to 3.730 l/h (0,1 to 820 gph)

  • Working pressure up to 300 barg or 4.350 psi

  • Chemical resistant coated cast iron enclosure

  • AISI 316, PVC, PVDF, HAST C liquid end

Metering Pumps in Singapore

For maximum accuracy and reliability

At Winston Engineering, we understand the importance accuracy plays in substance or liquid movement under controlled conditions. Our team is thus dedicated to designing dosing pumps that offer the best accuracy. Setting the standard for safety, and reliability, our robust systems maximise your operations. Get more information of our metering technology, and range of applications.

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