FluidTech News

 Running a Pipeline Centrifugal Pump at Low Flow? It’s Quietly Damaging Your Pump A very common habit in the field: 👉 “Flow too high? Just close the valve a bit.” Sounds simple — but here’s the truth: 👉 Low-flow operation = unstable internal flow = long-term damage 💥 What actually happens inside? ✔ Inlet Recirculation Liquid starts flowing backward near the impeller eye ✔ Stronger Vortices Flow becomes chaotic, energy gets wasted ✔ Flow Impact on Blades Instead of following the blade angle, liquid hits it ✔ Higher Cavitation Risk Low-pressure zones → bubbles → collapse → damage 📉 What you’ll notice on site More noise (humming / rumbling) Increasing vibration Unstable discharge Performance drops over time 👉 In most cases, low-flow operation is the real cause 🚫 Biggest misconception 👉 Low flow ≠ low load In reality: 👉 It’s an off-design, stressful condition Your pump is not “relaxing” — it’s struggling. ✅ What should you do? ✔ Keep operation near design flow (BEP) ✔ Avoid lon...

 What Happens When Gas–Liquid Separation in a Self-Priming Pump Is Incomplete? In many real-world applications, there is a critical but often overlooked truth: A self-priming pump does not fail because it “cannot pump” — it fails because it cannot fully separate air from liquid. If gas–liquid separation is insufficient, the pump may still run, but its performance, stability, and lifespan will all be compromised. 👉 For a deeper technical breakdown, you can refer to: 🔗 https://www.scpv.cn/news/868.html 1. First, Understand the Mechanism A self-priming pump works by repeatedly circulating a gas–liquid mixture: Air + liquid enter the pump The mixture flows into the separation chamber Air is discharged, liquid recirculates Only when air is fully expelled can the pump establish a stable vacuum and normal operation . 2. Key Impacts of Insufficient Gas–Liquid Separation ① Loss of Self-Priming Ability If air remains trapped inside the pump: Vacuum level drops Suction capacity weakens 👉 R...

 How Does Stator Stress Change in a Progressive Cavity Pump Under High Pressure Differential? In industries such as wastewater treatment, oil & gas, and high-viscosity fluid transfer, progressing cavity pump is widely used due to its steady flow, low pulsation, and strong adaptability. However, in real-world operation, a common issue is often observed: 👉 Under high pressure differential conditions, stator wear accelerates significantly Many assume this is simply due to “high pressure,” but the deeper reason is: 👉 The internal stress distribution within the stator has fundamentally changed Basic Principle: Progressive Sealing Cavities A progressing cavity pump operates by: Forming sealed cavities between the rotor and stator Transporting fluid progressively from suction to discharge 👉 Each cavity carries part of the pressure 👉 Essentially: Pressure is distributed step-by-step along the axial direction How High Pressure Differential Changes Stator Stress 1. Increased Contact ...

 How Do Internal Forces Change in a Diaphragm Pump Under High Back Pressure? Diaphragm pumps are widely used in chemical dosing, fluid transfer, and high-precision metering applications due to their leak-free structure and strong adaptability to corrosive media. However, in real-world operation, a common situation is often overlooked: 👉 The pump operates under high back pressure conditions Many users focus only on whether the pump can “handle the pressure,” but ignore a deeper issue: 👉 The internal force distribution has already changed What Is High Back Pressure Operation? High back pressure occurs when: Discharge resistance increases Downstream system pressure rises Valves are partially closed or pipelines become restrictive 👉 As a result: The pump must overcome higher opposing pressure to discharge fluid How Internal Forces Change Inside the Pump 1. Increased Stress on the Diaphragm The diaphragm is the core component, responsible for: Creating suction (negative pressure) Gen...

 What Causes Abnormal Temperature Rise in Magnetic Drive Pumps? Internal Mechanism Analysis Magnetic drive pumps are widely used in chemical, pharmaceutical, and environmental industries due to their sealless design, making them ideal for handling hazardous, flammable, or corrosive fluids. However, during operation, a common issue is observed: 👉 The pump operates normally, but temperature rises abnormally In most cases, this is not caused by a single factor, but by multiple internal mechanisms acting together. Why Magnetic Drive Pumps Are Prone to Heat Accumulation Unlike conventional pumps, magnetic drive pumps feature: Magnetic coupling (no mechanical seal) Fully enclosed containment shell 👉 This leads to: Limited heat dissipation Heat accumulation inside the pump Once heat is generated, it becomes difficult to release. Key Internal Mechanisms Behind Temperature Rise 1. Eddy Current Loss (Primary Heat Source) During operation: The outer magnet creates a rotating magnetic field ...

 How Is Interstage Pressure Distribution Formed in CDLF Vertical Stainless Steel Multistage Pumps? In applications such as high-rise water supply, industrial boosting, and water treatment systems, CDLF vertical stainless steel multistage pumps are widely used due to their compact structure, high efficiency, and strong head capacity. However, in real-world operation, many users focus only on the total head, while overlooking a more fundamental question: 👉 How is the interstage pressure distribution actually formed? Understanding this process is key to mastering the working principle of multistage pumps. Structural Basis: Why Pressure Is Built Stage by Stage CDLF pumps are vertical multistage centrifugal pumps, characterized by: Multiple impellers arranged in series Guide vanes (diffusers) between stages Fluid gaining energy progressively 👉 This means: Pressure is not generated at once, but built up progressively across multiple stages Step-by-Step Formation of Interstage Pressure ...