The normal lifespan of the JONSN precision-grade micro gear pump can exceed 20,000 hours.

Sources of lifespan data:

●Verified through our lifespan testing platform, using water as the medium, and operating under a continuous run of 5*8 hours. Currently, the sample has completed 20,000 hours of testing, and all performance indicators remain intact;

●Comprehensive analysis of wear rate;

●Customer feedback statistics;

●After-sales service department maintenance record statistics;

There are many factors that affect lifespan, such as pump inlet conditions, on/off working duration, operating speed, load (pressure), whether the medium contains particulates, dry running, and working temperature.

●All gears are made from VICTREX-PEEK material from the UK, utilizing precision CNC gear hobbing machines from Japan, combined with post-processing shaping techniques for the gears, resulting in high precision, consistency, and interchangeability.

●The gear shafts are made from zirconia nano-ceramic, which offers high strength and rigidity, excellent wear resistance, and shows almost no signs of wear compared to traditional stainless steel shafts.

●The bearings are made from high-quality bearing-grade PEEK composite ceramic material, which has strong wear (running dry) capabilities. Testing has verified that after 2 hours of running dry, they still maintain repeatability and linearity, effectively ensuring the stability of the gear's positional accuracy in all directions.

●JONSN, as a rising star in the industry, has conducted in-depth analysis and comprehensive optimization of the shortcomings of traditional micro gear pumps, leveraging over twenty years of research and development experience in micro gear metering pumps. JONSN brand products stand out in both domestic and international markets for their exceptional performance, distinguished by superior quality and innovative technology.

●JONSN is dedicated to providing customers with precision-grade gear pumps that are meticulously designed and rigorously tested, ensuring that products meet high-performance standards from the outset. This eliminates the trial-and-error costs for customers during product selection and application, preventing frequent replacements due to short lifespan. JONSN micro gear pumps guarantee customers a truly worry-free experience with their stability and reliability, allowing them to avoid incurring additional "tuition fees" for immature products.

Yes, the JONSN precision-grade gear pump outperforms traditional diaphragm metering pumps in various indicators.

The JONSN precision-grade gear pump is made from high-quality materials sourced both domestically and internationally, and it employs core gear material processing methods and heat treatment technologies. Through repeated verification and calculation of gear fit gaps, it is manufactured using precision machining, resulting in high consistency in non-pulsating delivery. It is commonly used in applications requiring precise measurement of media, and flow control can be achieved by adjusting the motor speed.

When discussing the delivery accuracy of pumps, many customers focus solely on the pump's precision. In fact, delivery accuracy is primarily divided into two parts.

The matching degree of inlet conditions is one of the key factors for the proper use of gear pumps. Over 60% of pump failures are caused by mismatched inlet conditions, such as:

1 The inlet pipe diameter is designed to be too small or too long, with too many bends, leading to reduced pump flow, increased noise, and the generation of bubbles (cavitation), especially when transporting viscous media. It is particularly important to pay attention to this, as cavitation can cause premature wear of the gears. The correct approach is to strictly follow the pipeline dimensions recommended in our selection report, minimize the length of the inlet pipeline, and ensure that the liquid level in the raw material tank is higher than the pump inlet (i.e., positive pressure flow into the pump), which can significantly extend the pump's service life;

2 The sealing of inlet pipeline joints and valves;

3 Gear pumps are susceptible to damage from hard particles, so the inlet pipeline must be kept clean, especially from welding slag, iron filings, easily detached burrs, sealing glue, and raw tape generated during grinding. A filter should be installed at the front end of the inlet pipeline (preferably a large-capacity filter), and the filter screen should be replaced regularly. A clogged filter screen can increase fluid resistance, reduce flow, and generate bubbles in the medium.

4 Stress and gravity from the pipeline and related equipment should not be applied to the pump and motor. When using flanges and rigid pipes for connection, a pipe rack should be used for fixed support, and the inlet and outlet interfaces should be aligned centrally.

Recently, some customers reported that certain manufacturers produce micro gear pumps with brushless motors that can achieve speeds exceeding 6000 rpm, while JONSN's motors are limited to 4000 rpm. Can JONSN's precision-grade micro gear pumps reach 6000-7000 rpm? After feedback to JONSN engineers, it became clear that the customer's demand was to reduce costs while maintaining the same pump displacement, aiming to increase flow by raising the speed. While increasing the speed can indeed enhance flow, why does JONSN recommend that customers keep the motor speed below 4000 rpm? This seemingly simple question actually reflects multiple issues:

1. The relationship between motor speed and pump lifespan Generally speaking, with the pump remaining unchanged and the inlet conditions being met, the higher the pump speed, the greater the flow, which also accelerates the wear of the gear shaft. Due to the high-speed friction between the gear shaft and the sliding bearing, as well as between the gear and the pump casing, the instantaneous temperature can rise significantly, leading to potential bearing burn-out. The longer this condition persists, the more severe the wear becomes, resulting in a shorter lifespan, especially when the inlet conditions are poor, which can easily lead to gear cavitation.

2. The relationship between medium viscosity and motor speed The viscosity of the medium plays a crucial role in the mechanical efficiency of the pump, directly affecting the pump's speed, efficiency, and power. The greater the viscosity, the higher the resistance in the pipeline. Mechanical efficiency tends to decrease as viscosity increases. For gear pumps, reduced internal leakage leads to increased volumetric efficiency, meaning that under the same speed conditions, the actual output flow can increase.

When transporting high-viscosity materials, it is necessary to lower the speed while increasing the inlet pipe diameter to reduce fluid resistance, which can help prevent issues such as cavitation, flow interruption, and dry running. JONSN has a specialized selection system for precision-grade gear pumps; by inputting relevant parameters, the system can automatically calculate and match the appropriate pipe diameter sizes. Below is a reference table of the viscosities of various common materials: (for reference only) 

According to experience:

l When conveying a viscosity of 1 m.Pas similar to water (non-volatile medium), the rotational speed should be controlled within 4000 rpm.

l For materials with a viscosity of 100 m.Pas, the speed can be controlled within 3000 rpm;

l If the following operating conditions are encountered, please contact our engineers, and we can provide a comprehensive solution:

l Conveying viscosity of 0.3-1 m.Pas (volatile medium);

l Materials containing micron-sized particles;

l Conveying of high-viscosity melt materials;

l High-viscosity media that are prone to solidification;

l Inlet negative pressure conveying.

The above lists some common operating conditions. Different operating conditions require different pump operating speeds. JONSN has over 10 years of professional experience in precision gear pump selection and has participated in major domestic and international projects, assisting design institutes in verifying process parameters. While adhering to the intrinsic quality of gear pumps, we are willing to share our application experience with our clients to help our partners avoid unnecessary detours.

Internal leakage in a gear pump refers to the phenomenon where a portion of the fluid on the outlet pressure side flows back through the gear clearance to the low-pressure inlet side, affecting the volumetric efficiency of the gear pump. Since the gear shaft needs to rotate flexibly within the gear chamber, there exists an internal clearance, the size of which determines the amount of internal leakage. As a result, the actual output flow will be less than the theoretically calculated flow, i.e., Actual Flow Q_real = Theoretical Flow Q_theo - Internal Leakage Q_leak.

Typically, the amount of internal leakage varies linearly with the viscosity of the medium and the pressure, primarily exhibiting the following characteristics:

l When the clearance remains constant, a higher viscosity of the medium results in less internal leakage; conversely, a lower viscosity leads to greater internal leakage.

l When the clearance remains constant, a higher outlet pressure results in greater internal leakage; conversely, a lower outlet pressure leads to less internal leakage.

Please refer to Chart (1); at a viscosity of 1 m.Pas, the increase in pressure shows the maximum curve offset. In Chart (2), at a viscosity of 100 m.Pas, the curve offsets at each pressure point decrease. In Chart (3), at a viscosity of 300 m.Pas, the curves at each pressure point nearly coincide, indicating that the internal leakage is relatively small at this point.

The above chart illustrates the variations in viscosity and pressure curves when the clearance between components remains constant (i.e., within an appropriate range). When the clearance is either too small or too large, the pump may experience the following failures:

l When the clearance is too small, the flexibility of the gear rotation is significantly compromised due to changes in the medium's temperature and viscosity. This can easily lead to gear seizure, wear of the pump body, and an increased risk of gear shaft breakage, all of which affect the overall lifespan of the pump.

l When the gear clearance is too large, the pump may exhibit poor self-priming capability, reduced flow rate, and inadequate pressure, particularly in conditions involving low-viscosity media with very small flow rates.

Internal leakage is a common issue for all gear pumps; however, controlling the clearance is one of the key indicators for assessing a precision-grade gear pump. It also represents a challenge in the manufacturing process and reflects the processing capabilities. To address this, the JONSN engineering team has conducted extensive experimental validations and adjustments to the manufacturing process to ensure optimal gear clearance.

The stability of motor speed has a significant impact on the delivery accuracy of pumps, almost in a linear relationship, making the selection of a high-performance motor crucial.

l 12V/24V/48V DC brushless motors (including explosion-proof)

l 12V/24V/48V DC brushed motors

l 110V/220V/380V/400V/440V AC asynchronous motors (including explosion-proof and variable frequency)

l 24V stepper motors

l 110V/220V servo motors (including explosion-proof)，all adhering to NEMA standards

l Customize IP67 waterproof motors and marine motors.

Our standard gear pumps are designed for a temperature range of -20 to 80°C for normal operation (it is not recommended to use them under conditions of extreme temperature fluctuations). For temperatures outside this range, customization is required.

The MPG/MR/MRV series precision-grade micro gear pumps can be customized for low temperatures of -60°C and high temperatures of 80-160°C.

The DP series precision-grade gear metering pumps can be customized for temperatures of 100-220°C.

The DX series high-viscosity gear pumps can be customized for a maximum temperature of 400°C. For applications involving extreme temperatures, please contact our engineers.

Our pumps can be made from different materials, allowing us to find a compatible material for most fluids. Given the diverse operating conditions and fluids, we always recommend testing the pump in a loop under the same conditions as actual operation. If the compatibility data for the medium being transported is not available, we can send relevant materials for corrosion resistance testing.

We can transport the following materials: dichloromethane, tetrahydrofuran, nitric acid, sulfuric acid, hydrofluoric acid, butyllithium, trimethylgallium, pyridine, liquid chlorine, liquid ammonia, UV glue, dimethylacetamide, etc. Please contact us if conventional pump heads cannot transport these materials; we can customize solutions based on the operating conditions.

The pump can use materials that comply with FDA standards.

It is recommended to install a 25-micron large-capacity filter at the pump inlet, with a sufficiently large filtration area to avoid pressure drop and protect the internal components of the pump.

Magnetic couplings not only reduce power consumption and extend the pump's service life but also eliminate rotating seals and potential sources of wear and contamination. They should be used when seal failure could lead to environmental or hygiene issues. They are also more reliable when high system pressures are involved.

When the pump load is too high or the gears are abnormally jammed, exceeding the torque capacity of the magnetic coupling, the magnetic drive pump will demagnetize (decouple) and produce noise. When decoupling occurs, the motor should be stopped immediately to investigate the fault.

The MPG/MR/MRV series precision micro gear pumps have an arrow indicating the direction of fluid flow, but they can operate in both directions. The flow rate during reverse operation will be less than that during forward operation, and long-term operation in reverse is not recommended. The DP and DX gear pumps cannot be reversed.

Our gear and shaft sleeve materials are made of modified PEEK and undergo post-treatment reinforcement, providing strong resistance to dry running. You can view our dry running test video. However, dry running should be minimized to avoid shortening the pump's lifespan.

Gear pumps cannot transport media with particles. If the media must retain solid materials, the pump needs to be customized, and the pump body and gears require wear-resistant coatings. Please consult an engineer for details.

The noise level depends on the pump installation, motor speed, and fluid type. When the pressure difference is 3 bar and the speed is 3000 rpm, the reference value for the gear pump at 1 meter is 55 dB.

JONSN has professional selection software that can calculate the required input power based on your operational requirements and fluid characteristics.

Pumps are dynamic equipment and inevitably face various extreme operating conditions, wear of easily worn parts, and issues related to exceeding the warranty period.

The list of easily worn parts mainly includes:

Drive gear & shaft,

Driven gear & shaft,

Bearings,

Internal magnetic drive,

PTFE/EPDM/FKM/FFKM sealing rings. 

To ensure stable production, it is recommended to have a primary and backup plan for pumps that control critical processes. If space and budget constraints exist, it is advisable to purchase a set of easily worn spare parts as an emergency backup solution.

Our precision-grade micro gear pump features a modular design, allowing for quick and convenient replacement of easily worn parts. You will enjoy the following services:

● Reliable quality original factory spare parts package

● Efficient global logistics and delivery

● Provision of relevant technical support to assist you in selecting and installing spare parts

For customers purchasing JONSN precision-grade micro gear pump spare parts, you will need to provide the gear pump code (as shown in the illustration), and we can query the factory's gear fit clearance based on the code and carry out customized production processing.

Each JONSN pump has a logo and a laser code on the end face. These identify the manufacturing date, product code, and serial number (S/N). The S/N code allows for tracing the original configuration sheet and test records.

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