FluidTech News

 What Happens When a Self-Priming Pump Operates Near Vacuum Limit Conditions? In many industrial sites, operators encounter situations like: The pump is still running The motor seems normal But flow rate keeps dropping Noise and vibration become stronger Some people immediately assume: 👉 “The pump is failing.” But in many real-world cases: 👉 the pump is actually operating near its vacuum limit condition. More related technical content: 👉 https://www.scpv.cn/news/868.html 1. What Is a Vacuum Limit Condition? Simply put: 👉 the suction pressure becomes too low. As suction resistance increases: Liquid becomes harder to enter the pump Internal vacuum rises continuously Once the pressure approaches the liquid vaporization point: 👉 abnormal conditions begin to appear. 2. The Most Common Problem: Cavitation One of the clearest signs is: 👉 loud cracking or “gravel-like” noise inside the pump. This is usually cavitation. When inlet pressure becomes too low: Liquid partially vaporizes V...

 How Stator Compression Deformation Affects the Stability of Single Screw Pumps Single screw pumps are widely used for transferring: High-viscosity fluids Sludge and wastewater Chemical liquids Media containing particles One major reason for their popularity is: 👉 stable and continuous flow delivery However, in long-term operation, many systems gradually develop problems such as: Unstable flow rate Pressure fluctuation Reduced conveying performance In many cases, the root cause is not the motor or pipeline. 👉 The real issue is often stator compression deformation. For more technical details, visit: 👉 https://www.scpv.cn/news/927.html 1. Why the Stator Is Critical in a Single Screw Pump A single screw pump works through the interaction between: A metallic rotor An elastic rubber stator Together, they form sealed cavities that continuously move fluid forward. 👉 The sealing effect between rotor and stator directly determines: Flow stability Pressure performance Conveying efficienc...

 Why Is Your Air-Operated Diaphragm Pump Flow Unstable? The Problem Might Not Be the Pump If you notice: Flow rate going up and down Irregular operating rhythm Pipeline vibration or pulsation Most people assume something is wrong with the pump. But in many real-world cases: 👉 the issue is not the pump — it’s the air supply The Key Point An air-operated diaphragm pump is fully driven by compressed air: Stable air pressure → stable flow Fluctuating air pressure → unstable flow 👉 Air controls everything Common Causes In field applications, the most frequent issues include: Insufficient compressor capacity Air leakage in pipelines Unstable pressure regulator Blocked air filter These directly lead to pressure fluctuations. How to Quickly Identify the Problem Check these three things: Pressure gauge fluctuations Flow rate changes Pump rhythm variation 👉 If all three change together, it’s very likely an air supply issue. Why It Matters Ignoring this can lead to: Inaccurate dosing Proce...

 What Chain Reactions Can Occur When Magnetic Coupling Fails in a Magnetic Drive Pump? Magnetic drive pumps are widely used in chemical processing, pharmaceuticals, and other industries due to their sealless design and zero-leakage advantage. However, in real operation, a less obvious but critical issue may occur: 👉 magnetic coupling interruption (decoupling or slipping) In many cases, the pump appears to be running normally, but system performance starts to decline. This is not just a pump issue—it can trigger a series of chain reactions across the entire system. For more technical details, refer to: 👉 https://www.scpv.cn/news/877.html 1. What Is Magnetic Coupling Interruption? Magnetic drive pumps transmit torque through magnetic force: The motor drives the outer magnet assembly Magnetic force transfers torque to the inner magnet The inner magnet drives the impeller When conditions such as overload, high temperature, or increased resistance occur: 👉 The magnetic force may beco...

 Why Screw Pumps Should Never Run Dry: A Common Mistake That Damages Equipment In many industrial applications, screw pumps are widely used for their stable flow, low pulsation, and ability to handle high-viscosity fluids. However, a common mistake in daily operation often leads to performance decline or even equipment failure: 👉 running the pump dry Many users think running the pump for a short time without liquid is harmless. But in reality: 👉 dry running is one of the most damaging conditions for a screw pump 1. Why Screw Pumps Depend on Liquid A screw pump is a type of positive displacement pump. Its operation is based on: The rotation of the screw inside the stator Formation of sealed cavities to move fluid forward In this process, the fluid itself plays a critical role: 👉 it acts as both the working medium and the lubricant 2. What Happens During Dry Running? When there is no liquid inside the pump: The screw and stator come into direct contact Lubrication is lost Heat can...

 What Causes Screw Pump Seal Failure? Key Factors You Shouldn’t Ignore In industrial fluid handling, screw pumps are widely used for their stable flow, low pulsation, and strong ability to handle high-viscosity or particle-laden media. However, in real-world applications, one issue still shows up frequently: seal failure. From an engineering perspective, it’s fair to say that choosing the right pump is only half the job—whether the sealing system is reliable often determines how long the pump can run without trouble. So what actually causes screw pump seal failure? Here are the key factors. 1. Fluid Characteristics: The Most Overlooked Factor Many users focus on flow rate and pressure, but overlook how the fluid itself affects sealing performance. Typical risks include: High viscosity → increases friction and heat Solid particles → cause abrasion and scratches Corrosive media → attack sealing materials Crystallizing fluids → deposit around seal faces 👉 In many cases, seal failure ...