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Diaphragm Metering Pumps

Diaphragm Metering Pumps for Precision Chemical Dosing

Four Electric Diaphragm Pumps for Trusted Chemical Containment

A chemical pump manufacturer for more than 80 years, Pulsafeeder engineers diaphragm metering pumps that deliver precise, reliable chemical dosing across the most demanding industrial applications. Our complete portfolio spans four electrically driven diaphragm pump technologies—solenoid, stepper motor, mechanical, and hydraulic, covering flow rates from fractional gallons per day to 2,292 GPH and pressures from 80 to 3,625 psi.

Diaphragm metering pump diagram showing suction and discharge stroke cycles with fluid flow direction
Cutaway diaphragm metering pump diagram revealing internal solenoid components and pump head assembly

Meet compliance requirements & minimize total cost of ownership

Because every Pulsafeeder diaphragm pump uses a sealed diaphragm rather than dynamic shaft seals, chemical containment is inherent to the design, not an afterthought. Whether you are specifying a solenoid dosing pump for water treatment, a stepper motor pump for precision chemical feed, a continuous-duty mechanical pump for high-flow industrial applications, or a high-pressure hydraulic pump for oil and gas injection, Pulsafeeder offers a purpose-matched solution that meets your compliance requirements and minimizes total cost of ownership.

Find the Right Electric Diaphragm Pump for Your Application

Each of Pulsafeeder’s electrically driven diaphragm pumps is designed for a specific combination of flow rate, pressure, dosing precision, duty cycle, and control requirements. Use the comparison below to identify the right technology for your application; then explore the dedicated product page for detailed specifications, model options, and accessories.

Pulsatron Solenoid

Best For

Broad chemical dosing: water treatment, agriculture, general industrial, pool & spa

Flow Range

Up to 600 gpd

Max Pressure

Up to 300 psi

Control Options

Manual, 4-20mA, microprocessor, timer, ratio control

Key Certifications

ETL, ETL San., CE, NSF 61; Hazardous Location (Series X); NSF/ANSI/CAN 61, NSF/ANSI 372 (select Pulsatron models)

Warrenty / Service

25+ years proven; KOPKit & PEPkit

NextStep Stepper Motor

Best For

High-precision, low-pulsation metering: off-gassing or viscous chemicals

Flow Range

0.5 – 21.1 GPH

Max Pressure

Up to 362 psi

Control Options

Digital stepper; 4-20mA, Modbus/RS-485; proportional, batch, timer

Key Certifications

CE, NSF/ANSI/CAN 61, UL

Warrenty / Service

5-year warranty incl. diaphragm; KOPKit

GreenLine Mechanical

Best For

Continuous duty, higher-flow metering: motor-driven industrial reliability

Flow Range

7 – 824 GPH

Max Pressure

Up to 174 psi

Control Options

Manual, VFD

Key Certifications

NSF/ANSI/CAN 61, NSF/ANSI 372, ATEX (optional)

Warrenty / Service

2 years

PulsaPro, Pulsa, Pulsar Hydraulic

Best For

High-pressure heavy industrial metering: oil & gas, petrochemical, power generation

Flow Range

Up to 2,292 GPH

Max Pressure

Up to 3,625 psi

Control Options

Manual stroke, 4-20mA, pneumatic, NEMA 4X/7 XAE controllers

Key Certifications

API-675, NSF/ANSI/CAN 61, NSF/ANSI 372 (PulsaPro), CE, ATEX

Warrenty / Service

5-year drive train warranty; KOPKit; 4-bolt tie-bar in-place service

The Pulsafeeder Advantage: Diaphragm Pumps with Sealless Precision

Pulsafeeder diaphragm metering pumps use a reciprocating membrane to move fluid through a sealed chamber. This positive displacement design eliminates shaft seals and packing, providing a 100% leak-free barrier that prevents contamination and mechanical wear. That means you get:

  • Zero Leakage: No dynamic seals means no chemical spill risks or environmental liabilities—slashing the maintenance costs associated with centrifugal or gear pumps.

  • Universal Compatibility: Diverse wetted-end materials (PTFE, PVDF, 316SS) handle aggressive acids, slurries, and off-gassing chemicals like sodium hypochlorite.

  • Dosing Precision: Flow rate is governed by stroke length and frequency, ensuring consistent accuracy regardless of fluctuating system back pressure.

Accuracy by diaphragm pump drive technology

Drive Type

Metering Accuracy

Hydraulic

∓1%

Mechanical / Stepper Motor

∓2%

Solenoid

∓2%

Pulsafeeder's Complete Portfolio of Diaphragm Metering Pumps

Pulsafeeder Pulsatron solenoid diaphragm metering pump with manual stroke and rate control dials
Explore the Pulsatron Series

Solenoid Diaphragm Pumps—Pulsafeeder Pulsatron Series

The Pulsatron Series is Pulsafeeder’s most versatile chemical dosing platform—industry-proven for more than 25 years across water treatment, agriculture, pool and spa, cooling tower, general industrial, and municipal applications. Solenoid actuation delivers reliable metering performance with a compact footprint and a broad range of control options, from simple manual stroke adjustment to 4-20mA and microprocessor control. NSF 61-certified models are available for potable water applications. The Pulsatron X Series meets Class I, Division 1 hazardous location ratings and Class II Division 1 dust ratings for operation in classified areas.
  • Pressure to 300 psi | Flow to 600 gpd | Turndown to 1000:1 (MP Series)
  • Control options: manual, external pace, 4-20mA, timer (T7), microprocessor (MP), ratio control (E+ RC)
  • Certifications: ETL, ETL Sanitation, CE, NSF 61 (PVDF and PVC Degassing Head models)
  • Maintenance: KOPKit and PEPkit available for easy field serviceability
  • HV Series handles viscous fluids to 20,000 cPs—flooded suction installation
All Pulsatron Series include standard bleed valve assemblies for safe, easy priming. For off-gassing chemical applications including sodium hypochlorite, options include Five Function Valves and Five Function Degas Valves (which also aid backpressure, anti-siphoning, and priming) or factory-configured degassing head models — providing flexibility to match the solution to the application.

Stepper Motor Diaphragm Pumps—Pulsafeeder NextStep

The NextStep stepper motor diaphragm pump delivers near-constant chemical feed with 4,800-step digital resolution, eliminating the pulsation effects that require external dampeners on conventional pumps. Digital control of both the discharge and suction strokes allows the NextStep to reliably meter off-gassing chemicals and high-viscosity fluids that cause traditional pumps to lose prime. A solid PTFE diaphragm, five-year warranty including the diaphragm, and Modbus/RS-485 communication capability make the NextStep the premium choice for precision chemical dosing applications.
  • Pressure to 362 psi | Flow 0.5 to 21.1 GPH | Turndown 3,333:1
  • Eliminates external pulsation dampeners — digital suction stroke control manages off-gassing without manual intervention
  • Certifications: CE, NSF/ANSI/CAN 61, UL
  • 5-year warranty including diaphragm | KOPKit serviceability
Pulsafeeder NextStep stepper motor diaphragm metering pump with digital display
Explore the NextStep
Pulsafeeder GreenLine DM3-4 mechanical diaphragm metering pump for chemical transfer applications
Explore GreenLine Mechanical Diaphragm Pumps

Pulsafeeder GreenLine Mechanical Diaphragm Pumps

GreenLine is Pulsafeeder’s industrial-grade mechanical diaphragm pump, engineered for water treatment plants, chemical processing facilities, mining operations, and manufacturing environments where reliability is non-negotiable. Flow rates from 3.2 to 824 GPH and auto-locking stroke adjustment eliminate flow drift without manual recalibration. A contamination-proof gearbox, multi-million-cycle PTFE diaphragm, and toolless valve removal minimize maintenance intervention. GreenLine’s optional double-diaphragm leak detection configuration adds pressure-monitored integrity alerts—the strongest chemical containment option in the mechanical diaphragm pump category.
  • Flow 3.2 to 824 GPH | pressure to 174 psi | NSF/ANSI/CAN 61, ATEX optional
  • Optional double-diaphragm configuration with leak detection and pressure monitoring
  • Multi-million-cycle PTFE diaphragm | toolless valve removal | contamination-proof gearbox

Pulsafeeder Chem-Tech Mechanical Diaphragm Pumps

Our Chem-Tech Series 100-150 and Prime Performance bring motor-driven metering reliability to water conditioning applications. With flow rates from 3 to 100 GPD and pressures to 100 psi, Chem-Tech mechanical diaphragm pumps deliver dependable, affordable chemical dosing with a range of wetted-end material options— PTFE, PVDF, PVC, CSPE, and Viton—for compatibility across residential and light commercial treatment chemistries. Five Function Valve and Five Function Degas Valve options are available on the Series 100-150 for off-gassing chemical applications.

  • Flow 3 to 100 GPD | pressure to 100 psi
  • Wetted-end materials include PTFE, PVDF, PVC, CSPE, Viton | KOP Kits available
Pulsafeeder Chem-Tech mechanical diaphragm metering pump for chemical dosing applications
Explore Chem-Tech Mechanical Diaphragm Pumps
Pulsafeeder Pulsa Series hydraulic diaphragm metering pump for high-pressure chemical injection applications
Explore Hydraulic Diaphragm Pumps

Hydraulic Diaphragm Pumps—PulsaPro, Pulsa Series, Pulsar

When your application demands the highest pressure ratings, API-675 compliance, or heavy industrial reliability, Pulsafeeder’s hydraulic diaphragm pump line is the answer. Hydraulic actuation uses pressurized oil to move a hydraulically balanced diaphragm, eliminating the mechanical stress that limits other drive technologies and enabling sustained operation at pressures up to 3,625 psi. The PulsaPro and Pulsa Series carry API-675 certification for oil and gas applications. HypoValve automatic degassing handles sodium hypochlorite and other off-gassing chemicals without operator intervention. A 5-year drive train warranty and 4-bolt tie-bar valve assembly allow complete in-place service without disturbing system piping.
  • Pressure to 3,625 psi | Flow to 2,292 GPH | Accuracy to ±1%
  • Certifications: API-675, NSF/ANSI/CAN 61, CE, ATEX, WQA
  • HypoValve automatic degassing for sodium hypochlorite and off-gassing chemical applications
  • 5-year drive train warranty | KOPKit | 4-bolt tie-bar in-place maintenance

Applications and Industries for Pulsafeeder Metering Diaphragm Pumps

Pulsafeeder electric diaphragm metering pumps serve the full breadth of chemical dosing and metering applications—from fractional-flow water treatment systems to high-pressure pipeline injection. Our four drive technologies, combined with a comprehensive range of wetted-end materials and certifications, ensure a purpose-matched solution for any process fluid and operating environment.

Water Treatment

NSF 61-certified metering for chlorination, pH control, fluoridation, and coagulant feed — municipal and private systems

Oil & Gas

API-675 compliant hydraulic diaphragm pumps for scale inhibitor, corrosion inhibitor, and chemical injection in pipeline and refinery applications

Municipal Infrastructure

High-reliability dosing for wastewater treatment, disinfection, and nutrient removal — from small lift stations to large treatment plants

Food & Beverage

NSF 61 and sanitary-certified pumps for CIP chemical dosing, disinfection, and process chemical feed in food-grade environments

Chemical Processing

Precise metering of acids, caustics, solvents, and reaction chemicals with full material compatibility across PTFE, PVDF, PVC, and 316 SS

Power Generation

High-reliability dosing for wastewater treatment, disinfection, and nutrient removal — from small lift stations to large treatment plants

Agriculture & Irrigation

Durable, weather-resistant solenoid metering pumps for fertigation, pesticide injection, and water conditioning in agricultural systems

General Industrial

Broad chemical compatibility and application flexibility across manufacturing, HVAC treatment, automotive, and specialty chemical processes

Pulsafeeder Diaphragm Pump Certifications and Compliance

Pulsafeeder is one of the only chemical pump manufacturers with a complete portfolio of diaphragm metering pumps that satisfy regulatory requirements across potable water, oil and gas, hazardous area classification, and international electrical standards. Reduce your supplier qualification burden and simplify compliance documentation across mixed-application facilities.

NSF/ANSI/CAN 61

Potable water safety — Pulsatron, NextStep, GreenLine, PulsaPro

API-675

Oil & gas precision metering — Pulsa Series, PulsaPro, Pulsar

ATEX/Class I Div 1

Hazardous area rated — Pulsa Series, Pulsatron X

ETL/ETL Sanitation & CE

Electrical safety—Pulsatron Series, Chem-Tech 100-150,  Chem-Tech Prime Performance. International electrical standard across all lines.

ANSI/INSF STD 50

Chem-Tech 100-150, Chem-Tech Prime Performance, and Pulsatron pumps used for pools and spas

WQA

Water quality certification — PulsaPro, Pulsatron, GreenLine, NextStep

UL

Safety listing — NextStep

25+ Year Track Record

Proven field reliability across all four technologies

Diaphragm Pump Accessories and Complete System Components

Pulsafeeder supplies a complete ecosystem of pre-engineered, compatible accessories so that you can source an entire chemical feed system from a single manufacturer and eliminate compatibility risk. Every accessory is designed and tested alongside our pump lines.

Available accessories include:

  • Back pressure valves and pressure relief valves
  • Calibration columns for metering verification
  • KOPKit and PEPkit maintenance kits for field serviceability
  • Pulsation dampeners (for applications where external dampening is required)
  • Injection valves, foot valve strainers, and suction/discharge tubing
  • Mixers, tanks, and chemical storage systems
  • PULSAlarm and CHEMAlarm leak detection for hydraulic pump systems

For applications using the NextStep stepper motor diaphragm pump, external pulsation dampeners are typically not required. The NextStep’s digital suction stroke control eliminates gas binding and flow pulsation without additional equipment.