High-pressure, stable, and linear delivery of urea solution is the core to achieving high-efficiency purification in SCR exhaust gas treatment systems. Traditional diaphragm metering pumps used in marine and automotive diesel engine exhaust gas treatment suffer from large delivery pulses, significant flow fluctuations, and insufficient operational stability, making them unable to meet the high-precision urea injection requirements.

The JONSN-MR Series Precision Urea Gear Pumps enable fast, accurate, high-pressure, and stable injection of urea solution, with uniform atomization and high reduction efficiency. They effectively remove pollutants such as CO, HC, and PM, making them an ideal delivery device for SCR systems.

Ⅰ. Current Development of the SCR Exhaust Gas Treatment Industry

Since the implementation of China’s National Stage VI Emission Standard for heavy-duty diesel vehicles nationwide on July 1, 2021, diesel engine exhaust aftertreatment technologies have seen an urgent need for upgrading. Technologies including Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF), and Selective Catalytic Reduction (SCR) have been gradually adopted, among which SCR has become the mainstream due to its core advantages:

1.  NOₓ conversion efficiency of up to 90% without reducing engine efficiency.

2.  Excellent fuel economy and high sulfur resistance.

3. Compliance with stringent emission standards such as China VI, Euro IV, and Euro V, effectively reducing NOₓ and particulate matter emissions and improving the atmospheric environment in ports and cities.

Ⅱ. Core Selection Requirements for Urea Pumps in SCR Systems

As the core power component of an SCR system, the urea pump pressurizes and delivers urea solution from the storage tank to the injector, and its performance directly determines the exhaust gas purification effect. Key selection requirements for urea pumps in SCR systems are as follows:

Compared with centrifugal pumps (insufficient pressure), diaphragm metering pumps (large pulses, vulnerable diaphragms, and cumbersome maintenance), and traditional metal rotor pumps (severe wear and large size), micro magnetic gear pumps perfectly solve the pain points of pressurized linear delivery of urea solution, making them the optimal choice for SCR systems.

Ⅲ. Core Technological Breakthroughs of Micro Magnetic Gear Pumps

The performance of micro magnetic gear pumps depends on three core dimensions: modified PEEK material, precision machining of key components, and structural design. JONSN has achieved comprehensive breakthroughs through technological innovation:

(1) Gear Shaft: Dual Upgrades in Material and Process

1. Traditional solution: Ordinary carbon-fiber PEEK gears + 316L stainless steel shafts – shafts are prone to wear and gears run out after 5–6 months of operation, resulting in short service life.

2. Ordinary injection molding solution: Imported PEEK gears + ceramic shafts – one-time injection molding easily causes deformation and poor gear consistency.

3. JONSN precision solution: High-strength wear-resistant PEEK gears imported from the UK + zirconia nano-ceramic shafts. Through precision CNC gear hobbing and high-temperature molding heat treatment, the gears feature high precision, stable dimensions, good consistency, and ultra-long service life under heavy loads.

(2) Sliding Bearings: Special Formulation for Heavy Loads

Traditional bearings use ordinary carbonfiber PEEK, only suitable for light-load conditions. JONSN adopts a specially modified PEEK-based composite nano-ceramic formula with proprietary molding technology, providing dry-wear resistance and high load capacity, with a service life of over 20,000 hours.

(3) Structural Design: Innovative Two-Section Design Replaces Traditional Three-Section Design

The traditional American three-section structure with PTFE diaphragm sealing has multiple sealing points, high internal leakage, and difficult precision control.

JONSN’s innovative two-section structure with static sealing ring design offers core advantages:

· High assembly precision of gear shafts, with matching clearance guaranteed by machining without manual grinding.

· Fewer sealing points, reducing leakage risks.

· Large-diameter flow channel design, low fluid resistance, and high delivery efficiency.

· Modular adaptation to various motors, including 24V DC and 380V/440V AC.

Ⅳ. JONSN-MR Series Exclusive Solution for Marine SCR Systems

In response to the stringent requirements of marine SCR urea delivery systems, including a flow rate of 130 L/h, pressure of 10 bar, 440V marine voltage, and classification society certifications, JONSN provides customized solutions.

· Actual flow rate: 132.48 L/h

·  Applicable viscosity: minimum 0.5 mPa·s

· Maximum system pressure: 4 MPa

·  Operating temperature: −40°C to 180°C

· Material configuration: 316L pump body, zirconia ceramic shaft, imported modified PEEK gears, special composite ceramic bearings, leak-free magnetic drive

Integrated with the SCR central closed-loop control system, it enables load-adaptive precise injection of urea solution via speed regulation, ensuring stable and efficient exhaust gas purification under variable working conditions.

Ⅴ. Core Product Advantages of JONSN-MR Series

1. Compact and space-saving: Miniaturized design for easy integration, suitable for narrow spaces in marine, vehicle-mounted, and industrial equipment, with flexible layout.

2. High-precision delivery for stable purification: Pulse-free and highly linear flow output, with precise and controllable urea injection volume to ensure full NOₓ reduction and emission compliance.

3. Corrosion resistance and long service life: Full corrosion-resistant materials with self-lubricating friction pairs, adapting to corrosive urea working conditions, reducing downtime maintenance, and extending overall equipment life.

4. Marine classification society certifications for global compliance: Full series certified by multiple international classification societies, meeting marine equipment standards and directly applicable to SCR systems on ocean-going vessels.

Ⅵ. JONSN Brand Strength

Founded in 2010, JONSN specializes in the R&D, production, and sales of precision gear pumps, adhering to the philosophy of “Diligently and Focusedly Making Every Precision Gear Pump”. In 2020, its new factory in Ganzhou was put into operation, equipped with MAZAK machining centers, CNC machining centers, gear hobbing machines, gear grinding machines, Zeiss coordinate measuring machines, German Wenzel gear testers, pump assembly lines, and marine pump performance testing platforms (convenient for on-site inspection by surveyors). The company maintains good cooperation with global classification societies including CCS, BV, NK, LR, and ABS, and is certified by TÜV Rheinland ISO 9001-2015.

JONSN entered the marine SCR field in 2016, with mature system solutions, core patented technologies, and international certifications. It is a qualified supplier to China Shipbuilding Industry Corporation, China Shipbuilding Power Engineering Institute, and Hudong-Zhonghua Shipbuilding (Group) Co., Ltd. Its products have become key control equipment for online delivery in high-end manufacturing. We believe our communication and cooperation will streamline your system design and make us your reliable partner.