Technical Article

A technical guide details the disassembly and assembly procedures for the NP98 series of micro magnetic gear pumps, specifically the NP1700 model. It lists the pump's performance specifications, such as its flow rate, accuracy, and operational limits. The core of the guide is a step-by-step sequence for dismantling and reassembling the pump unit, which includes handling the magnetic drive components, gears, and pump body sections. The document also functions as promotional material for the manufacturer, Shanghai Suofu (Shanghai Super Fluid Co., Ltd.), presenting the pump's applications in the Chinese market. Read More

A common cause of insufficient pressure in gear pump systems is an incorrectly set pump outlet safety valve. If the valve's opening pressure is configured too low, it will activate prematurely, diverting flow through its bypass once system pressure reaches this low threshold. This action effectively caps the maximum achievable pressure at the pump's outlet to the safety valve's set point, which is below the system's required working pressure. To prevent this issue, standard practice dictates setting the safety valve's pressure approximately 1.2 to 1.3 times higher than the intended operating pressure of the system. This analysis is part of a series examining various root causes for pressure deficiencies in gear pumps. Read More

Gear pump working pressure is determined not by the pump alone, but by the backpressure in the downstream system. This backpressure originates from the combined resistance of the piping and the load at the pipeline's end. Consequently, a pump's actual operating pressure will only match the system's total resistance, even if the pump's rated capability is higher. Therefore, proper pump selection requires ensuring the pump's pressure capacity exceeds this total system demand to achieve the necessary fluid delivery. Read More

Gear Pump Insufficient Pressure Fault Cause Analysis: Part 3 focuses on troubleshooting when an actual gear pump's pressure is insufficient, causing the system to underperform relative to its design. After ruling out incorrect system pressure design, the analysis directs inspection towards three primary areas: whether the selected motor power is inadequate, if the gear pump itself is worn, and if the system supply to the pump is insufficient. For pump wear, a key recommendation is to install a pre-pump filter with a mesh count exceeding 400 to prevent particulate contamination, as gear pumps are unsuitable for media containing solids. Reference is made to a separate analysis for detailed causes of insufficient supply. Read More

The second part of the fault analysis series addresses insufficient pressure in gear pumps, focusing on the cause of an inaccurate system design pressure value. A discrepancy between the designed and the actual calculated system pressure leads to a deviation in the pump's operational pressure. The analysis concludes that if the pump system is otherwise functioning correctly, the appropriate corrective action is to revise the design specifications based on the actual measured pressure value. Read More

The core requirement was a pump capable of withstanding 100 bar pressure. The NP060 model met this need, operating effectively within a wide temperature range of -120°C to 150°C. The summary highlights the pump's key advantages for this application: compact size, resistance to low temperatures and high pressure, extended service life, high safety, leak-free operation, and suitability for handling gas-liquid two-phase fluids. Read More