FluidTech News

 Fluorine-Lined Chemical Pump vs. All-Titanium Pump: Which Offers Better Value for Highly Corrosive Service? In chemical processing, electroplating, acid pickling, pharmaceutical production, wastewater treatment, and other corrosive-fluid applications, pump material selection can directly affect equipment life, maintenance costs, leakage risk, and production reliability. For highly corrosive service, two solutions are often considered: fluorine-lined chemical pumps and all-titanium alloy pumps. At first glance, the comparison seems simple. Fluorine-lined pumps generally have a lower initial cost, while titanium pumps use a more expensive metallic material. But does a higher material cost automatically mean better corrosion resistance? No. The better choice depends on the chemical composition, concentration, temperature, pressure, solids content, operating conditions, and total lifecycle cost. Why Are Fluorine-Lined Pumps Commonly Used for Corrosive Chemicals? A fluorine-lined chemi...

 High-Viscosity Sludge Transfer: How to Reduce Stator Wear in Progressive Cavity Pumps Progressive cavity pumps, also known as single screw pumps, are widely used for high-viscosity sludge transfer, dewatered sludge handling, filter press feeding, concentrated sludge, and other difficult-to-pump fluids. Their main advantages include stable flow, relatively low pulsation, good suction capability, and the ability to handle viscous fluids that are difficult for conventional centrifugal pumps. However, one problem is frequently encountered in sludge applications: Why does the stator wear so quickly when pumping high-viscosity sludge? In many cases, the problem is not simply poor stator quality. Rapid stator wear is often caused by a combination of dry running, excessive pump speed, abrasive solids, high differential pressure, poor suction conditions, and incorrect stator material selection. Why Does High-Viscosity Sludge Cause Stator Wear? The pumping elements of a progressive cavity p...

 Pneumatic Diaphragm Pump Keeps Stopping? 3 Common Air Valve and Diaphragm Problems Pneumatic diaphragm pumps, also known as air-operated double diaphragm (AODD) pumps, are widely used in chemical processing, wastewater treatment, coatings, mining, food processing, and industrial fluid transfer. One of the most common operating problems is also one of the most confusing: The compressed air supply appears normal, but the pump suddenly stops. After restarting the air supply, the pump may run again for a while and then stop once more. When an AODD pump repeatedly stalls or stops, the air supply is not always the real cause. After checking external air pressure and air volume, three components deserve particular attention: the air valve, air valve seals, and diaphragms. 1. Air Valve Sticking or Failing to Shift The air distribution system is the heart of an AODD pump. Compressed air is alternately directed to the two air chambers, pushing the diaphragms back and forth. This continuous ...

 High-Precision Micro Dosing: How Digital Pulse Metering Pumps Work and How to Commission Them Accurate chemical dosing is essential in water treatment, chemical processing, laboratories, food production, pharmaceutical systems, and many automated industrial processes. When the required flow rate is very small, simply delivering liquid is not enough—the dosing system must also provide stable, repeatable, and adjustable output. A digital pulse metering pump is designed specifically for these applications. By combining precise diaphragm movement with electronic control, it can deliver small quantities of chemicals while allowing the dosing rate to be adjusted according to actual process requirements. How Does a Digital Pulse Metering Pump Work? Most digital pulse metering pumps use an electromagnetic or motor-driven mechanism to move a diaphragm inside the pump head. During the suction stroke, the diaphragm moves backward and creates negative pressure inside the pump chamber. The inl...

 Explosion-Proof Self-Priming Pumps for Flammable Liquids: What Should You Check Before Selection? Transferring gasoline, kerosene, solvents and other flammable liquids requires more than simply choosing a pump with the correct flow and head. In hazardous industrial environments, pump selection must consider explosion protection, suction conditions, sealing reliability, material compatibility and liquid volatility. For applications involving low-level tanks or frequent loading and unloading, an explosion-proof self-priming pump can be a practical solution. Why Use a Self-Priming Pump in Hazardous Areas? In many oil depots and chemical plants, the liquid level is below the pump installation position. A self-priming pump is designed to evacuate air from the suction line and establish liquid flow after the initial priming procedure. This makes it useful for applications such as: Fuel transfer Solvent handling Tank unloading Tank truck loading and unloading Chemical liquid transfer Low...

 Cutting Sewage Pumps for Fibers and Rags: When Are They the Right Choice? Wastewater does not always contain only water and small solid particles. In many industrial and domestic sewage systems, the real trouble comes from rags, hair, plastic film and long fibers. These materials may not look difficult to pump, but once they wrap around the impeller, they can quickly cause reduced flow, higher motor current or even complete pump blockage. This is where a cutting sewage pump can be useful. Why Are Fibers More Difficult Than Solid Particles? A conventional non-clog sewage pump is generally designed with a relatively large flow passage so that certain solid particles can pass through the pump. Fibrous materials behave differently. Rags, hair and long fibers are flexible and easy to wrap around rotating components. Even relatively small pieces can accumulate around the impeller or inlet. Therefore, when selecting a sewage pump, particle size is not the only consideration. The type and...

 Why Do Chemical Pump Mechanical Seals Keep Leaking? 3 Installation Details You Should Not Ignore Mechanical seal leakage is one of the most common problems during chemical pump operation. Many users replace the mechanical seal repeatedly but still experience leakage after a short period of operation. In many cases, the problem is not only the seal itself — incorrect installation and operating conditions are often the real causes. For chemical pumps, mechanical seal installation details directly affect equipment reliability and service life. 1. Improper Installation Causes Uneven Seal Wear A mechanical seal works by maintaining close contact between the rotating ring and stationary ring to prevent liquid leakage. During installation, problems such as: Damaged sealing faces Incorrect installation position Improper compression adjustment Poor shaft alignment can cause uneven pressure on the sealing surfaces. After continuous operation, abnormal wear may occur, eventually resulting in...

 Gear Oil Pump vs High Temperature Oil Pump: How to Choose the Right Solution for Heat Transfer Oil and Lubricating Oil Transfer Keywords: gear oil pump, high temperature oil pump, heat transfer oil pump, lubricating oil transfer pump, industrial oil pump selection Description: Choosing the right oil pump is critical for stable operation in industrial heating systems and lubrication applications. This article explains the differences between gear oil pumps and high temperature oil pumps, and how to select the suitable pump according to temperature, viscosity and working conditions. Gear Oil Pump vs High Temperature Oil Pump: Selection Guide for Industrial Oil Transfer In industrial production, heat transfer oil and lubricating oil are widely used in heating systems, machinery lubrication, chemical processing and other fields. Choosing a suitable oil transfer pump directly affects system efficiency, equipment life and operating stability. Many users often confuse gear oil pumps with...

Plunger vs. Diaphragm Metering Pumps: How to Choose for Water Treatment Dosing Metering pumps are widely used in water treatment systems to inject chemicals accurately and continuously. Two common options are plunger metering pumps and diaphragm metering pumps. So, which one is better? The answer depends mainly on the chemical, pressure, flow rate and safety requirements. 1. Plunger Metering Pump: Strong Pressure Performance A plunger metering pump uses the reciprocating movement of a plunger to draw in and discharge the liquid. Its main advantages include: High discharge pressure capability Accurate and stable dosing Relatively direct mechanical structure Suitable for stable and less corrosive liquids For applications where the chemical is relatively stable and the system requires higher pressure, a plunger metering pump can be a practical choice. However, its sealing structure requires particular attention when handling corrosive, toxic or hazardous chemicals. 2. Diaphragm Metering P...

 Why Does a Liquid Ring Vacuum Pump Need Circulating Water? Key Operating Factors for Stable Vacuum Performance Liquid ring vacuum pumps are widely used in chemical processing, vacuum filtration, evaporation, drying, degassing, power generation, and many other industrial vacuum systems. Unlike many dry vacuum technologies, a water-ring vacuum pump depends on a continuous supply of operating liquid—most commonly water. This often leads to a practical question: Why is circulating water so important, and what happens when its flow rate or temperature is incorrect? The answer is simple: water is not merely a cooling medium. It is an active part of the vacuum-generation process. The Water Ring Is Part of the Pumping Mechanism Inside a liquid ring vacuum pump, the impeller is installed eccentrically relative to the pump casing. When the impeller rotates, centrifugal force pushes the operating liquid toward the outer wall of the casing, creating a rotating liquid ring. Because of the ecce...

Why Does the Operating Current of a Submersible Pump Increase? Common Causes and Troubleshooting Methods Submersible pumps are widely used in wastewater treatment, drainage systems, industrial water supply, construction projects, and underground water pumping applications. During normal operation, the motor current of a submersible pump should remain within the rated range. However, after a period of operation, some users may notice: Increasing motor current; Higher motor temperature; Abnormal vibration or noise; Frequent overload protection trips. These symptoms indicate that the pump may be operating under abnormal conditions. So, why does the operating current of a submersible pump increase? What factors cause the motor load to rise? 1. Increased Load Caused by Changes in Pumping Medium The operating current of a submersible pump is closely related to the motor load. When the characteristics of the pumped liquid change, the resistance inside the pump system may increase. Common situ...

 Why Must a Screw Pump Never Run Dry? Causes of Stator Damage Explained Screw pumps are widely used for transferring high-viscosity liquids, sludge, wastewater, chemicals, food products, and other difficult-to-handle media. Compared with many conventional pumps, they can maintain relatively stable flow even when handling viscous or particle-containing fluids. However, there is one operating rule that should never be ignored: A screw pump should not be started or operated without sufficient medium inside the pump. Why is dry running so dangerous? The main reason lies in the working relationship between the rotor and stator. How Does a Screw Pump Work? In a typical single screw pump, also known as a progressive cavity pump, the main pumping elements are: A metallic rotor An elastic stator As the rotor rotates inside the stator, a series of sealed cavities is formed. These cavities continuously move from the suction side toward the discharge side, carrying the medium through the pump....

Why Does a Diaphragm Pump Outlet Pressure Fluctuate? Causes and Solutions for Stable Operation In industrial fluid transfer systems, air operated diaphragm pumps are widely used in chemical processing, wastewater treatment, electroplating, food, pharmaceutical, and other industries due to their excellent corrosion resistance, self-priming ability, and capability of handling complex fluids. However, during actual operation, some users may find that the outlet pressure of a diaphragm pump is unstable. Typical symptoms include: Pressure gauge pointer fluctuates continuously; Discharge pressure rises and falls periodically; Downstream equipment cannot maintain stable operation. What causes diaphragm pump pressure fluctuation? How can the pump achieve more stable operation? Shanghai Shangcheng Pump & Valve analyzes the main causes and practical solutions. 1. Unstable Air Supply Pressure For air operated diaphragm pumps, compressed air is the driving power. If the air supply system canno...