Custom Chemical Metering Pump Manufacturers

SYEELAI is a China-based Custom Chemical Metering Pump Manufacturer focused on corrosion-resistant fluid transfer and precision dosing. We design and build mechanically actuated diaphragm, plunger and hydraulically actuated diaphragm pumps, and we can configure them into complete chemical dosing and fluid handling systems with mixers, filters, valves, pulsation dampers and back-pressure valves.

Because metering pumps are positive displacement machines, delivered flow is set by stroke length, stroke frequency and liquid-end geometry. We use the process working point to right-size the pump, then match wetted materials, seal arrangement and control interface to the chemical and the surrounding plant. Our range supports water treatment chemical injection, fine chemical proportioning, electroplating additive feed, pharmaceutical dosing and petrochemical process duties where dosing stability matters more than raw throughput.

Metering Pump Range at a Glance

We manufacture three pump families inside this category. The table below summarizes how each family is positioned and where it fits in an industrial dosing system.

We also build the supporting hydraulics around the pump: back-pressure valves to stabilize discharge, pulsation dampers to smooth flow, relief valves for overpressure protection and calibration columns for verification. When the dosing function is part of a larger treatment line, we can scope the connection to our mixing and filtration solutions as well.

Mechanical Diaphragm Metering Pumps

Mechanical diaphragm metering pumps are the economical first choice for low-to-moderate pressure chemical dosing. A direct mechanical linkage drives the diaphragm, so there is no rotating seal in the liquid end and no need for a hydraulic oil system. That construction gives leak-free operation and simplifies maintenance while keeping initial cost competitive.

• Good repeatability for water treatment and additive injection applications
• Diaphragm liquid end isolates the process fluid from the drive mechanism
• Available in corrosion-resistant and acid/alkali-resistant material configurations

Typical duties include pH correction, biocide dosing, coagulant feeding and scale inhibitor injection. Available series in this family include JCM, JWM, GS, GM, GB and GD, spanning high-precision and industrial mechanical diaphragm configurations.

Plunger Metering Pumps

Plunger metering pumps use a reciprocating plunger to displace liquid directly, giving high volumetric efficiency and the ability to handle higher system pressures than standard diaphragm designs. Because the plunger and packing gland are in contact with the process fluid, these pumps are best selected for non-hazardous, relatively clean liquids where pressure is the dominant requirement.

• High volumetric efficiency for precise liquid displacement
• Rugged construction for continuous industrial duty cycles
• Suitable for high-pressure water and chemical proportioning feeds

Typical applications include process water injection, boiler water treatment and heavy-duty industrial metering. Our plunger range includes JX, JZ, JB, JD and JT series, including high-precision and high-pressure configurations.

Hydraulic Diaphragm Metering Pumps

Hydraulic diaphragm metering pumps are our most robust family for critical duties. An intermediate hydraulic oil system transmits plunger movement to the diaphragm and balances the load on the diaphragm face, reducing mechanical stress and extending service life. This construction is a strong fit for toxic, flammable, abrasive or aggressive chemicals because the process fluid remains contained within a leak-free diaphragm liquid end.

• Diaphragm protected by hydraulic balance, improving longevity
• Leak-free liquid end for hazardous or high-purity chemicals
• Suitable for higher pressures and continuous process operation

Common duties include petrochemical injection, environmental chemical feed and pharmaceutical processing. The hydraulic range includes JYX, JYZ, JYB, JYD, JYT and JYW series, covering leak-free, heavy-duty and double-diaphragm configurations.

Configuration and Automation Integration

A metering pump package is not complete without the correct control interface. We configure the pump for manual stroke adjustment in simple installations or for automatic operation through an actuator and variable-speed control in process loops. Common integration points are analog signals from a PLC/DCS, pulse signals from a flow meter or remote start/stop from a treatment controller.

• Stroke length adjustment for manual or automated flow setting
• Control signal selection matched to the existing plant architecture
• Accessory package selected to protect accuracy and dampen pulsation

During project review we confirm the signal type, turndown requirement and accuracy target so the final package can be commissioned without interface modification.

Quality, Testing and Project Support

Quality control runs through the full chain: raw material sampling and verification when material enters our factory, fixed-point patrol inspection during production and full-performance verification of finished products. Complete inspection data is kept throughout the process to support traceability from source to delivery. We also maintain complete industrial qualifications and a standardized qualification system across the product families we supply.

Service coverage includes 24/7 response, remote diagnosis, on-site guidance and after-sales maintenance, with service files set up for each customer. Industrial-grade protective packaging is used for multi-scenario transport, and logistics nodes are synchronized so delivery status remains visible. Our product brochures, selection manuals and technical documents support installation planning and spare parts identification.

Frequently Asked Questions

What is the difference between mechanical and hydraulic diaphragm metering pumps?

Mechanical diaphragm pumps use a direct mechanical linkage to actuate the diaphragm, making them economical for lower-pressure chemical injection. Hydraulic diaphragm pumps use an intermediate hydraulic oil system to balance the diaphragm load, which suits higher pressures and critical or aggressive chemicals where long service life is required.

When should we use a plunger metering pump instead of a diaphragm pump?

Use a plunger pump when the liquid is non-hazardous, relatively clean and the required discharge pressure exceeds the practical range of a diaphragm design. Plunger pumps offer high volumetric efficiency and rugged durability, making them suitable for high-pressure process water and heavy-duty industrial proportioning.

What information do you need to prepare a metering pump proposal?

We need the fluid composition and physical properties, required flow range, maximum discharge pressure, suction conditions, target accuracy, control signal type, power supply and site classification. With these details we can select the correct pump family, material combination and accessory package.

Do you provide complete dosing systems with accessories?

Yes. We supply metering pumps together with back-pressure valves, pulsation dampers, relief valves and calibration columns where needed. We also undertake design, installation and commissioning of customized dosing devices and non-standard chemical liquid filtration systems, allowing us to deliver a complete dosing package.

What quality checks do your metering pumps pass before delivery?

Our quality system covers raw material sampling and verification upon entry, fixed-point patrol inspection during production and full-performance verification of finished products. Inspection data is retained throughout the process for traceability, supporting consistent project documentation.

Can you support installation and after-sales service?

We provide 24/7 responsive service covering remote diagnosis, on-site guidance and after-sales maintenance. Service files are set up for each customer, and operation status is tracked proactively to help keep production lines running continuously and stably.