The PTFE Diaphragm Pump is engineered for the continuous, severe-duty transfer of aggressive acids, hazardous solvents, and high-purity chemicals. Built with solid virgin PTFE (Polytetrafluoroethylene) wetted components, this pump completely isolates the process fluid from the mechanical drive and ambient air, eliminating shaft seal wear points and fugitive emission risks common in centrifugal pumps.
Working Principle
Powered by compressed air or an electric motor, the dual-diaphragm design ensures continuous, pulsation-damped volumetric displacement. As one diaphragm strokes outward, it creates a vacuum that opens the inlet check valve and draws fluid into the liquid chamber. Simultaneously, the opposing diaphragm discharges fluid under pressure through the outlet check valve. This alternating, balanced stroke mechanism delivers a smooth, stall-free fluid stream.
Core Advantages
• Universal Chemical Resistance: Solid PTFE liquid pathways safely handle aggressive acids (98% H2SO4, 37% HCl), strong oxidizers, and volatile organic compounds without leaching or structural degradation.
• Hermetically Sealless Architecture: Zero shaft seals or packing glands mean absolute fluid containment-protecting operators and plant environments from hazardous leaks.
• Dry-Run & Dead-Head Safe: Can run dry indefinitely or operate against a closed discharge valve without generating destructive frictional heat or seizing components.
• Infinitely Variable Flow & Pressure: Regulating inlet air pressure or stroke frequency adjusts flow instantly from zero to maximum capacity without complex VFDs.
• Shear-Sensitive Fluid Handling: Gentle displacement action prevents the breakdown of shear-sensitive polymers, latex emulsions, and biological fluids.
Typical Media Handled
• Hydrochloric Acid (HCl up to 37%)
• Sulfuric Acid (H2SO4 up to 98%)
• Sodium Hypochlorite (NaOCl / Bleach)
• Nitric Acid, Acetic Acid, and MEK
• Ultrapure Deionized (DI) Water and Chemical Slurries
Typical Industries
• Chemical Processing & Bulk Storage Transfer
• Semiconductor Manufacturing & Wet Bench Tooling
• Pharmaceutical Synthesis & Solvent Recovery
• Industrial Wastewater Treatment & Chemical Dosing
• Electroplating & Metal Surface Finishing
Technical Specifications & Material Construction
To ensure seamless plant integration, our pumps match standard global industry performance envelopes and mounting footprints.
Standard Operating Parameters
|
Model |
Max Flow Rate |
Max Discharge Pressure |
Max Suction Lift (Dry/Wet) |
Port Connection |
Air Inlet / Exhaust |
|
PDP-25 |
60 L/min (15.8 GPM) |
7 bar (100 PSI) |
4.5 m / 8.5 m |
1" ANSI / DIN |
1/4" NPT |
|
PDP-40 |
150 L/min (39.6 GPM) |
8 bar (116 PSI) |
5.2 m / 9.0 m |
1-1/2" ANSI / DIN |
1/2" NPT |
|
PDP-50 |
300 L/min (79.3 GPM) |
8 bar (116 PSI) |
6.0 m / 9.4 m |
2" ANSI / DIN |
3/4" NPT |
Material of Construction (MOC)
• Wetted Diaphragms: Virgin PTFE face paired with an internal EPDM/FKM backup elastomer, optimizing chemical inertness and mechanical flex life.
• Manifolds & Liquid Chambers: Precision-machined from solid extruded PTFE billets (eliminating micro-porosity and internal voids common in injection-molded plastics).
• Valve Balls & Seats: Solid PTFE or high-purity Alumina Ceramic for handling abrasive chemical slurries.
• Center Air Section: Polypropylene (PP) or epoxy-coated Aluminum, engineered to resist external corrosive atmospheric vapors in plant environments.
Application Scenarios & Plant Integration
Installed in outdoor containment pads to transfer concentrated acids from tanker trucks to day tanks. The solid PTFE exterior withstands harsh weather and occasional chemical splashes.
Integrated into chemical distribution modules (CDMs) for high-purity etchant supply. Internal wetted surfaces feature mechanical polishing (Ra <= 0.8 um) to prevent particle shedding and microbial growth.
Automatically injects precise amounts of acid or base into wastewater streams, withstanding frequent cycling and varying fluid viscosities without clogging check valves.
Manufacturing Quality Control & Factory Testing
Reliability in severe-service chemical environments is governed by strict machining tolerances and pressure validation.
Solid-Billet CNC Machining:
Housing blocks are machined directly from solid PTFE stock, ensuring absolute structural integrity under pressure surges.
100% Pneumatic & Hydrostatic Testing:
Every pump undergoes a 1.5x maximum working pressure test for 30 minutes to verify internal and external seal integrity before packaging.
Automated Performance Bench Testing:
Flow curves, air consumption metrics, and suction lift capabilities are logged against factory calibration benchmarks.
Material Traceability:
Material Test Reports (MTRs) for wetted PTFE components are archived and supplied upon request to satisfy plant QA/QC audits.
RFQ Guide: How to Specify Your PTFE Diaphragm Pump
To ensure an accurate engineering proposal and rapid quotation turnaround, please include the following technical parameters in your inquiry:
• Fluid Name, Concentration & Temperature: (e.g., 98% H2SO4 at 35°C).
• Required Flow Rate: (e.g., 100 L/min or 25 GPM).
• Discharge Head / Pressure Requirements: (e.g., 4.5 bar total backpressure).
• Suction Conditions: Flooded suction or dry suction lift height.
• Fluid Viscosity & Specific Gravity: (e.g., 1.4 cP, 1.83 SG).
•Utility / Environment Spec: Available plant compressed air pressure (bar / PSI) or if ATEX explosion-proof certification is required.
Frequently Asked Questions
Q: Can this pump run dry indefinitely without damaging internal components?
A: Yes. Because the design utilizes flexible reciprocating diaphragms rather than close-tolerance rotating impellers or mechanical seals, running dry generates no destructive friction, heat, or wear.
Q: What is the average service life of a virgin PTFE diaphragm under continuous operation?
A: Under nominal operating conditions (4 bar discharge pressure, ambient temperature), virgin PTFE diaphragms typically achieve between 10 million and 15 million cycles prior to scheduled preventive maintenance.
Q: How is electrostatic buildup prevented when pumping flammable or explosive solvents?
A: Standard virgin PTFE is an electrical insulator. For flammable solvent applications, we supply pumps manufactured from carbon-filled antistatic PTFE combined with external grounding lugs to safely dissipate static charges.
Q: Are the port dimensions and bolt patterns compatible with existing plant piping?
A: Yes. Our pump footprints, port sizes, and bolt circle configurations match international industrial standards, permitting direct drop-in replacement onto existing piping skids without requiring pipe redesign or welding.
Q: What compliance documentation is provided for chemical plant audits?
A: We supply CE declarations, ATEX Zone 1/2 certifications (for air-operated units), FDA-compliant material declarations, and 3.1 Material Test Reports (MTRs) upon request.
Q: What is the standard production lead time for orders?
A: Standard catalog PTFE pump models (PDP-25 through PDP-50) ship within 5 to 7 working days. Custom-engineered configurations or orders requiring special documentation ship within 2 to 3 weeks.
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