FluidTech News

 Does Outlet Pressure Affect the Accuracy of a Metering Pump? Key Factors Every Engineer Should Know Metering pumps are widely used in water treatment, chemical processing, pharmaceuticals, food production, and power plants because they deliver precise and repeatable flow rates. However, many engineers ask the same question during operation: Does a change in outlet pressure affect the dosing accuracy of a metering pump? The answer is yes—but the impact depends on the pump type, pressure variation, system design, and operating conditions. A pressure change does not automatically mean inaccurate dosing, but significant pressure fluctuations can influence the actual discharge volume. Shanghai Shangcheng Pump Valve explains how outlet pressure affects metering pump performance and what can be done to maintain high dosing accuracy. 1. Why Can a Metering Pump Deliver Accurate Flow? A metering pump is a positive displacement pump. Each stroke moves a fixed volume of liquid through a diaph...

 How to Determine the Length of a Vertical Sump Pump? Selection Guide for Different Tank Depths When selecting a vertical sump pump for chemical processing, wastewater treatment, electroplating, and industrial liquid transfer applications, one of the most common questions from engineers and buyers is: How long should the pump be? Many users assume that the pump length should simply match the depth of the tank. However, the actual length of a vertical sump pump depends on several factors, including the lowest liquid level, suction inlet position, installation height, liquid characteristics, and operating conditions. Shanghai Shangcheng Pump Valve provides customized vertical sump pump solutions according to different tank depths and industrial applications, helping customers achieve stable operation and longer service life. 1. What Determines the Length of a Vertical Sump Pump? The length of a vertical sump pump mainly refers to the distance from the mounting plate to the pump sucti...

 Why Can an Oil Pump Fail to Draw Oil? Installation and Troubleshooting Guide Oil pumps are widely used in industrial lubrication systems, fuel transfer equipment, hydraulic machinery, and various oil circulation applications. However, a common problem often occurs during operation: The oil pump starts running, but no oil is discharged, or the suction speed becomes very slow and the pressure cannot be established. Many users assume that the pump itself is damaged, but in many cases, the problem is related to: Incorrect installation; Air leakage in pipelines; Oil condition; Improper operating methods. Understanding the real cause can help reduce downtime and improve equipment reliability. 1. Air Inside the Pump Chamber Prevents Oil Suction Before starting some oil pumps, the pump chamber needs to be filled with oil. If too much air remains inside the pump: The pump cannot generate sufficient suction; Internal sealing performance decreases; Oil cannot be transported normally. This si...

 Why Does a Gear Oil Pump Lose Pressure Over Time? Common Causes and Troubleshooting Guide Gear oil pumps are widely used in lubrication systems, fuel transfer systems, hydraulic equipment, and industrial machinery because of their compact structure, reliable operation, and stable pressure performance. However, during long-term operation, many users encounter a common problem: The gear oil pump pressure gradually decreases after running for a period of time. At the beginning, the system works normally, but later the pump may show: Lower outlet pressure; Reduced oil supply; Increased operating noise; Unstable equipment lubrication. Why does this happen? The pressure decline is usually related to internal wear, oil conditions, suction problems, and system components. 1. Internal Gear Wear Increases Leakage A gear oil pump works by using the meshing movement of two gears to transport oil from the inlet side to the outlet side. During normal operation, the clearance between gears and t...

Why Are Rotary Lobe Pumps Suitable for High Viscosity Fluid Transfer? Key Advantages Explained In industries such as food processing, pharmaceuticals, cosmetics, chemicals, and environmental engineering, fluid transfer often involves materials with high viscosity. Typical examples include: Syrup; Honey; Cream products; Resin; Adhesives; Lubricating oil; High concentration chemical liquids. These materials have poor fluidity and high internal resistance, making them difficult to handle with conventional centrifugal pumps. For these applications, rotary lobe pumps are widely used because of their unique operating principle and gentle transfer characteristics. 1. Why Are Centrifugal Pumps Not Ideal for High Viscosity Fluids? Centrifugal pumps generate pressure through high-speed impeller rotation. They work well with: Water; Low viscosity liquids; Fluids with good flow characteristics. However, when viscosity increases, several problems appear: Pump efficiency decreases; Flow rate drops; ...

 Why Do Chemical Pumps Often Experience Mechanical Seal Leakage? Causes and Prevention Methods In chemical processing industries, pumps are required to handle various challenging fluids, including corrosive chemicals, high-temperature liquids, solvents, and fluids containing solid particles. Compared with ordinary water pumps, chemical pumps operate under much harsher conditions. One of the most common maintenance problems is: Mechanical seal leakage. Many operators find that a chemical pump works normally after installation, but after a period of operation, leakage begins to appear. Why does this happen? The answer is usually related to fluid characteristics, operating conditions, seal material selection, and maintenance practices. 1. Corrosive Fluids Damage Mechanical Seal Components Chemical pumps often transport: Acids; Alkalis; Organic solvents; Corrosive chemical solutions. If the mechanical seal materials are not suitable for the pumped medium, corrosion may occur. Typical p...