Chemical Dosing Pumps (Solenoid & Motor)

// MODULE-02 / PROCUREMENT STRATEGY

Break the Brand Monopoly.

As a global turnkey integrator, we understand that every project has different CapEx limits. We offer two distinct procurement tracks to secure your chemical supply chain.

Zero-Tolerance Projects

100% Genuine Tier-1 Brands

For critical infrastructure and government tenders where brand specification is mandatory. We leverage our massive integrator purchasing power to supply factory-fresh pumps directly from global warehouses.

SEKO® ProMinent® Grundfos® Milton Roy®

CapEx Optimization

WANDONG OEM Equivalents

For industrial RO skids, wastewater PAM dosing, and cooling tower chemicals. Achieve 100% of Tier-1 performance at 60% of the cost. Utilizing identical solid PTFE diaphragms and ceramic ball valves for extreme chemical resistance.

WANDONG PUMPS

// MODULE-07 / SELECTION GUIDE

Drive-Based Selection.

Selecting the correct pump drive is dictated by your required flow rate and the viscosity of the chemical being injected.

Low Flow / High Press.

0 - 50 L/h | Up to 20 Bar

Solenoid-Driven Pumps

Driven by an electromagnet. Highly precise stroke frequency control. Ideal for RO antiscalant, SMBS, and pH adjustment (acid/alkali) in clean water applications. Maximum viscosity: 100 cP.

SEKO Tekna Equivalent

High Flow / Low Press.

50 - 2000 L/h | Up to 10 Bar

Motor-Driven Pumps

Driven by a heavy-duty electric motor and gearbox. Required for bulk chemical transfer and high-viscosity liquids like PAM/PAC coagulants in wastewater treatment. Maximum viscosity: 1000 cP.

ProMinent Sigma Equivalent

// MODULE-03 / SPECIFICATION MATRIX

Universal Compatibility.

Stop paying premium brand markups. Our OEM pumps match the exact flow curves and mounting footprints of global Tier-1 brands.

Drop-In Replacement Targets

DATA SOURCE: OEM TECHNICAL BULLETINS

Drive Type	SEKO® Target	ProMinent® Target	WANDONG OEM Series
Solenoid (Analog/Manual) Manual Stroke Adjustment	Tekna AKL / Kompact	Concept Plus	WD-SOL-M MATCH
Solenoid (Digital/Pulse) 4-20mA / Pulse Input	Tekna TPG / TPR	Gamma/ X	WD-SOL-D MATCH
Motor-Driven (Mech. Diaphragm) High Flow / High Viscosity	Spring MS1 / MS0	Sigma / Vario	WD-MOT-MD MATCH

WANDONG OEM Verified Parameters

Series	Max Flow Rate (L/h)	Max Pressure (Bar)	Stroke Frequency	Power Supply	Tubing / Connection
WD-SOL-M (Analog)	1 - 50	Up to 20	120 - 300 strokes/min	100-240V AC	4/6mm or 8/12mm PE/PTFE
WD-SOL-D (Digital)	1 - 50	Up to 20	120 - 300 strokes/min	100-240V AC	4/6mm or 8/12mm PE/PTFE
WD-MOT-MD (Motor)	50 - 2000	Up to 10	58 - 116 strokes/min	380V 3-Phase	DN15 / DN25 Flange or Thread

* All pumps feature manual stroke length adjustment (0-100%).

Process Engineer's Note: Viscosity & Stroke Rate

When dosing high-viscosity chemicals (like PAM or concentrated polymers), you must derate the maximum stroke frequency. Operating a solenoid pump at 300 strokes/min with thick fluids will cause incomplete diaphragm return (cavitation) and severe flow degradation. Always select a Motor-Driven pump for viscosities exceeding 100 cP.

// MODULE-04 / MECHANICAL COMPATIBILITY

Seamless Retrofits.

Replacing a burned-out dosing pump shouldn't require drilling new holes in your PE tank or modifying your injection lines. WANDONG OEM pumps are engineered with exact mounting footprints and standard tubing connections.

Material Specifications

Pump Head

PVDF / PVC / SS316L

Diaphragm

Solid PTFE (Teflon)

Check Valves

Ceramic Balls

O-Rings / Seals

FPM (Viton) / EPDM

IP65 Enclosure Rating

Wall or Base Mount

100% Chemical Resist

SOLENOID PUMP

W: Standard Hole Pitch

// MODULE-05 / ENGINEERING ANATOMY

Deconstructing Reliability.

Pumping highly corrosive acids or viscous polymers requires uncompromising material science. Explore the wet-end architecture that prevents leaks and ensures exact dosing.

3D Exploded View of PTFE Diaphragm and Ceramic Check Valves in Dosing Pump Head

Wet-End Architecture

1. Solid PTFE Diaphragm

The heart of the pump. Machined from a single piece of pure PTFE (Teflon), ensuring absolute chemical compatibility with any acid, alkali, or oxidant. Tested for over 50 million strokes without fatigue or rupture.

2. Double Ceramic Ball Valves

Both the suction and discharge valves utilize double ceramic balls. This ensures a perfect, instantaneous seal on every stroke, preventing backflow and guaranteeing exact volumetric injection even at 20 bar pressure.

3. Heavy-Duty Worm Gear (Motor Series)

For our high-volume JZM series, the motor drives a rugged worm gear mechanism housed in a cast iron (HT200) bracket. The mirror-polished bearing box ensures frictionless operation and doubles the mechanical lifespan.

4. Non-Volatile EEPROM (Solenoid Series)

The digital controller features built-in EEPROM memory. In the event of a plant power outage, all stroke and frequency settings are permanently saved without requiring a CMOS battery. The pump resumes exact dosing immediately upon power restoration.

// MODULE-06 / OPERATING LIMITS

Fluid & Hydraulic Limits.

Strict adherence to these parameters ensures accurate dosing and prevents mechanical damage to the pump head.

Max Fluid Viscosity (Solenoid)	100 cP (Centipoise)
Max Fluid Viscosity (Motor-Driven)	1000 cP (Suitable for PAM/PAC)
Maximum Suction Lift	1.5 meters (Water equivalent)
Ambient Operating Temperature	0°C to 45°C
Maximum Fluid Temperature	50°C (PVDF) / 40°C (PVC)
Enclosure Protection	IP65 (Dust tight, water jet proof)

Chemical Compatibility

PVDF Head: Excellent for NaOCl, HCl, H2SO4, Antiscalants.
PVC Head: Economical choice for PAC, NaOH.
SS316L Head: Required for solvents and high-temperature organics.

Process Engineer's Note: Vapor Lock & Cavitation

When dosing Sodium Hypochlorite (NaOCl) or Hydrogen Peroxide (H2O2), the chemical naturally off-gasses. If gas bubbles accumulate in the pump head, the diaphragm will compress the gas instead of pushing the liquid, resulting in "Vapor Lock" (zero flow). Always install an Auto-Degassing Pump Head or a manual bleed valve for these specific chemicals.

// MODULE-08 / AUTOMATED DOSING

Closed-Loop Control.

Don't just measure the water; control it. Our pH/ORP controllers feature built-in High/Low relays to directly drive your acid and alkali dosing pumps.

P&ID Diagram of Automated pH Neutralization Dosing Control Loop

pH Dosing Control Loop Showcasing the sensor -> controller -> dosing pump feedback loop.

1

Real-Time Measurement

The WD-PH-6001 sensor continuously monitors the neutralization tank, sending instant pH values to the local controller.

2

High/Low Relay Activation

If the pH drops below the setpoint (e.g., pH 6.0), the controller's "Low Alarm" relay closes, instantly sending power to the Alkali dosing pump.

3

Automated Neutralization

The pump injects NaOH until the pH reaches the safe zone (e.g., pH 7.0). The relay opens, stopping the pump. Zero human intervention required.

// MODULE-09 / APPLICATION SCENARIOS

Injecting Precision.

From micro-dosing RO antiscalant to bulk transfer of viscous sludge polymers. We have the exact pump for your chemical.

RO Antiscalant

Low-flow solenoid pumps (e.g., 5 L/h) injecting scale inhibitors to protect expensive RO membranes.

Wastewater Treatment Plant PAM PAC Coagulant Dosing

PAM / PAC Coagulation

Motor-driven pumps handling high-viscosity polymers for sludge thickening and wastewater flocculation.

Chlorination (NaOCl)

Auto-degassing pump heads injecting Sodium Hypochlorite for municipal drinking water disinfection.

pH Neutralization

Injecting concentrated Sulfuric Acid (H2SO4) or Sodium Hydroxide (NaOH) using PVDF/PTFE wet ends.

// MODULE-10 / FACTORY & INVENTORY

Massive Production.
Wholesale Pricing.

We are not a trading company. WANDONG operates CNC machining centers for pump heads and automated assembly lines for solenoid coils. Every pump is wet-tested for flow accuracy and pressure integrity before boxing.

CNC Machined PVDF/PTFE Heads

100% Wet-Tested for Flow Accuracy

72-Hour Global Air-Freight Dispatch

Massive Warehouse Stock of Chemical Dosing Pumps

Dosing Pump Wet Testing and Calibration Line

// MODULE-11 / PROVEN IN THE FIELD

Powered by WANDONG.

We don't just sell individual pumps; we build the heavy-duty Chemical Dosing Skids that rely on them. Our pumps are the beating heart of our own containerized RO and MBR plants deployed across the globe.

The Integrator's Advantage

Because we use these exact pumps in our own $500,000+ EPC projects, they undergo rigorous internal quality control. We offer fully assembled Dosing Skids (including PE tanks, agitators, pumps, and PVC piping) ready to drop into your plant.

WANDONG Chemical Dosing Skid with PE Tanks and Mixers

FIELD DEPLOYMENT

WANDONG Turnkey Dosing Skid

Showcasing dual dosing pumps mounted on a 500L PE chemical tank with an agitator.

// MODULE-12 / THE ENGINEER'S UNBOXING

Ready to Install.
Out of the Box.

We don't just ship a bare pump. Every solenoid pump comes with a complete installation kit so your engineers can pipe it up immediately.

Foot Valve & Strainer

Included in the box. A ceramic-weighted foot valve with an integrated strainer ensures the pump only draws clean chemical from the bottom of your PE tank, preventing debris from clogging the check valves.

Injection Valve

Included in the box. A spring-loaded injection valve (1/2" thread) to install directly into your main water pipeline. It acts as an anti-siphon valve and ensures the chemical mixes instantly into the flow.

Tubing Kit

Included in the box. 2 meters of flexible PVC suction tubing, and 2 meters of rigid PE (Polyethylene) discharge tubing rated for high pressure. You have everything needed to connect the tank to the pipe.

// MODULE-13 / LOGISTICS MATRIX

Optimized for Global Transit.

We speak the language of freight forwarders. Packaging optimized for both rapid DHL air-freight and mass FCL sea-freight.

Single Solenoid Pump Carton

Dimensions (L×W×H)

~280 × 200 × 250 mm

Gross Weight

~3.5 kg (7.7 lbs)

Net Weight

~2.8 kg (6.1 lbs)

Volumetric Weight

~2.8 kg (Air-Freight)

* Values are approximations for a standard WD-SOL-M pump including installation kit.

Standard Pallet

100 pcs

EUR Pallet (1.2x1.0m), Shrink-wrapped

20ft Container

~1,600 pcs

FCL Loading Capacity (Solenoid Pumps)

// MODULE-14 / GLOBAL O&M SUPPORT

Direct Access to Senior Process Engineers.

Pump losing prime? Not sure how to wire the 4-20mA signal? Our clients get direct WhatsApp and Email access to our senior engineers for wiring diagrams, stroke frequency tuning, and vapor lock troubleshooting.

Wiring Diagrams Vapor Lock Support 24/7 Standby

Chat with Engineer Email Support Desk

// MODULE-15 / TECHNICAL FAQ

Hardcore FAQ.
Engineering-Grade Answers.

Should I choose a Solenoid or a Motor-driven pump?

It depends on your flow rate and chemical viscosity.

1. Solenoid Pumps are best for low flows (under 50 L/h) and high precision. They are ideal for RO antiscalant and pH adjustment because they easily accept 4-20mA signals for automated control.
2. Motor-Driven Pumps are built for brute force. Choose them when you need to inject large volumes (50 to 2000 L/h) of chemicals, such as PAC or PAM in wastewater clarifiers.

Can your pumps handle thick PAM (Polyacrylamide) solutions?

A standard solenoid pump cannot handle thick PAM (it will stall). For PAM, you must select our WD-MOT-MD (Motor-Driven) series. The mechanical gearbox provides the torque necessary to push high-viscosity fluids (up to 1000 cP) through the check valves.

My pump is running, but no chemical is coming out. What's wrong?

This is usually Vapor Lock (common with Sodium Hypochlorite) or a clogged foot valve. First, open the manual bleed valve on the pump head while the pump is running to expel any trapped gas bubbles. If liquid still doesn't flow, check the ceramic ball valves in the suction/discharge ports for debris or crystallization.

Are your pumps compatible with SEKO and ProMinent tubing?

Yes. Our solenoid pumps use the exact same standard tubing connections (4/6mm or 8/12mm) as SEKO Tekna and ProMinent Concept Plus. You can swap the pump head or the entire pump without changing your existing PE/PVC tubing.

What is your warranty policy?

We provide a 12-Month Warranty on the pump motor, solenoid coil, and main circuit board. Please note that wet-end parts (PTFE diaphragm, ceramic balls, O-rings) are considered consumables. The warranty is voided if the pump is run dry for extended periods or if operated against a closed discharge valve without a pressure relief valve installed.

How do you guarantee the flow rate accuracy before shipping?

Every single WANDONG dosing pump undergoes a rigorous Wet Test (FAT) at our ISO 9001 facility. We run the pump on a test bench with pure water against its maximum rated backpressure (e.g., 10 bar) to verify volumetric accuracy and ensure there are absolutely no leaks from the diaphragm or check valves before boxing.

// MODULE-16 / INITIATE PROTOCOL

YOUR 50,000m²
OEM SUPPLY BACKEND.

Stop paying premium brand markups for dosing pumps. Whether you need a single solenoid pump for an RO skid, or a complete motor-driven dosing station for a wastewater plant, our engineers will provide a precise proposal within 1 hour.

1h

INITIAL RESPONSE

1-ON-1

CUSTOM PROPOSAL

$0

CONSULTATION FEE

// SECURE YOUR SUPPLY CHAIN

Request Dispatch & Pricing

Work Email *

WhatsApp / Phone

Target Product *

Req. Flow Rate (L/h) *

Chemical to be Dosed (For Material Selection)

Notes & Destination Zip Code

If you need a complete dosing skid, please specify the PE tank volume (e.g., 100L, 500L) and whether an agitator mixer is required in the notes.

AVG. RESPONSE: < 4 HRS · NDA AVAILABLE ON REQUEST

Precision Dosing. Zero Lock-in.