Extreme Corrosion Resistance: Resistant to concentrated hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid, sodium hydroxide, sodium hypochlorite, organic solvents and strong oxidants. It is chemically inert to almost all acid and alkali solutions at room temperature.
Excellent Temperature Resistance: The long-term operating temperature ranges from -20℃ to 100℃, and the short-term temperature resistance can reach 120℃, which is superior to common anti-corrosion plastics such as PP and PVDF.
Non-adhesive and Low Friction: The smooth surface prevents scaling and medium adhesion, making it suitable for viscous, crystallizable and sedimentary slurries without blockage.
Insulation, Aging Resistance and Non-toxicity: It features weather resistance and fatigue resistance under acid and alkali conditions. No metal precipitation occurs, which meets the purification requirements of pharmaceutical and fine chemical industries.
Pneumatic Drive Module (Non-wetted Area): Consists of air distribution valve, reversing valve, air chamber, silencer and air inlet connector. Made of aluminum alloy or cast steel, this module controls air flow direction and drives diaphragm reciprocation. It does not contact corrosive liquid with an extremely low failure rate.
Fluid Flow Module (Core Anti-corrosion Area): The pump body, cover, inlet/outlet ports and valve seats are all made of PTFE. Two mainstream structures are available: integral PTFE structure and carbon steel lined PTFE structure. Integral PTFE performs better in temperature and pressure resistance, while lined PTFE has a higher cost-performance ratio.
Reciprocating Motion Module: Composed of central shaft, pressure plate and diaphragm. Driven by air pressure, it acts as the core power transmission component of the pump.
PTFE Diaphragm: Divided into pure PTFE and F46 composite diaphragms. F46 has higher toughness, tensile resistance and fatigue resistance, suitable for frequent start-stop and particle-containing media; pure PTFE provides the best corrosion resistance for high-purity strong acid working conditions. The diaphragm is the most vulnerable wearing part.
PTFE Ball Valve & Valve Seat: Spherical one-way sealing structure with excellent anti-blocking performance, preventing medium backflow and adapting to liquids containing impurities, sediments and crystals.
Sealing Gaskets: Made of fluororubber or EPDM to adapt to various acid and alkali working conditions and avoid flange and interface leakage.
Air Distribution Valve Slider: Controls air flow reversal. It is prone to wear after long-term operation, causing jamming and poor air supply.
By Caliber: DN15, DN25, DN40, DN50, DN80 (covering small-dose chemical feeding to large-flow waste liquid transportation);
By Structure: Vertical PTFE diaphragm pump and horizontal PTFE diaphragm pump;
By Interface: Threaded connection, flange connection and sanitary clamp connection;
By Material: Integral all-PTFE pump and carbon steel lined PTFE pump.
Clear liquid: Chemical raw materials, pharmaceutical liquid and pure water solvent;
Viscous liquid: Ink, resin, adhesive and high-viscosity slurry;
Particle-containing medium: Pickling waste residue, electroplating sludge and sedimentary mud;
Volatile medium: Ammonia water, organic solvents and volatile corrosive liquids.
Allow dry running without pump burnout;
Allow closed outlet pressure holding without equipment damage;
Self-priming height reaches 3-5 meters without water filling;
Support submerged installation, high-level discharging and mobile transportation;
Stepless adjustment of flow and pressure; higher air pressure brings larger flow rate.
Confirm Medium Parameters: Medium name, corrosiveness, temperature, viscosity and solid particle content;
Confirm Working Condition Parameters: Transportation height, pipeline length, elbow quantity and self-priming height;
Determine Flow Caliber: DN15/25 for small-dose dosing, DN40 for conventional industrial use, DN50/80 for large-flow sewage;
Match Wearing Part Materials: Pure PTFE diaphragm for strong acid; F46 composite diaphragm for particle-containing slurry.
Misunderstanding 1: Blindly select lined PTFE pumps, resulting in delamination and bulking under high temperature;
Misunderstanding 2: Adopt ordinary rubber diaphragms for strong acid conditions, leading to rapid corrosion and rupture;
Misunderstanding 3: Excessively high air pressure causes fatigue fracture of diaphragms;
Misunderstanding 4: Excessively thin inlet pipes lead to insufficient suction and low flow rate;
Misunderstanding 5: Omit pre-filters for large-particle waste residue, causing ball valve jamming and failure.
The compressed air must be dry and oil-free; an air filter is recommended at the front end;
The air inlet pressure shall be controlled within 0.2-0.6MPa; overpressure operation is strictly prohibited;
The pipe diameter of inlet and outlet pipelines shall not be smaller than the pump caliber to reduce pipeline resistance;
Fix pipelines with shock absorption measures to avoid interface loosening and leakage caused by pump vibration.
Check all interfaces for tightness before startup;
Slowly open the air inlet valve and conduct low-pressure no-load trial operation for 1-3 minutes;
Gradually increase air pressure to adjust the flow rate to meet process requirements;
Empty the medium inside the pump cavity before shutdown to prevent ball valve jamming caused by crystal precipitation.
Fault Phenomenon | Main Causes | Solutions |
|---|---|---|
Pump fails to start | Insufficient air pressure, jammed air distribution valve, ice blockage | Increase air pressure, disassemble and clean the valve, install drying filter |
Weak suction & low flow rate | Inlet air leakage, ball valve blockage, thin pipeline | Fasten interfaces, clean impurities, thicken inlet pipeline |
Severe vibration & abnormal noise | Excessive air pressure, unstable fixation, diaphragm wear | Reduce air pressure, install shock absorption base, replace diaphragm |
Inlet & outlet liquid leakage | Aging gaskets, loose flanges | Replace PTFE gaskets and fasten bolts evenly |
Diaphragm rupture & liquid leakage | Overpressure operation, sharp particles, material fatigue | Replace with F46 diaphragm, reduce air pressure, install pre-filter |
Rinse the pump cavity with clean water after use to avoid corrosion caused by medium crystallization;
Drain and clean the air filter weekly;
Empty residual liquid for dry storage during long-term shutdown;
Wearing part replacement cycle: diaphragms for 6-12 months; ball valves and gaskets for 12 months.
Vs. Stainless Steel Magnetic Pump: Magnetic pumps cannot resist hydrofluoric acid, are easy to jam and cannot run dry; PTFE diaphragm pumps have stronger corrosion resistance and higher working tolerance.
Vs. Plastic Centrifugal Pump: Centrifugal pumps cannot run dry, have poor self-priming performance and are prone to seal leakage; PTFE diaphragm pumps realize zero leakage with excellent self-priming capacity.
Vs. Screw Pump & Gear Pump: These pumps have complex mechanical structures, poor corrosion resistance and high maintenance costs; PTFE diaphragm pumps feature simple structure and low maintenance expense.
Vs. Lined PTFE Pump: Integral PTFE pumps have high temperature resistance and no delamination; lined PTFE pumps are cost-effective for normal-temperature weak acid and weak alkali conditions.