Quzhou Zhongyi Chemicals Co., Ltd was established in 2006 and is a professional manufacturer of pumps and instruments. Our main products include WQ series pumps, multi-stage clean water pumps and other products. With 19 years of experience, we are well aware of the needs of global customers and provide high-quality pumps, laboratory agitators and other products.
The types of pumps we provide include Submersible Pump, Centrifugal Pump, Fire Pump, Chemicals Pump, which can be used in municipal drainage and sewage treatment, industrial production processes, fire protection systems and other fields.
With strong R&D capabilities and OEM/ODM services, we provide reliable customized pumps and instrumentation for international customers. We will help your business development with trustworthy products and professional support.
Quality is our top priority. With more than 10 years of experience in centrifugal pump production, we are well aware of the importance of product safety, durability and consistency to our customers. All our products are independently developed and produced, and have passed the national compulsory product certification, non-negative pressure water supply equipment test report, and ISO9001, CQC and other international standard certifications. Our dedication to quality has won the trust of customers in Southeast Asia, Central America and Asia.
Raw material control
We carefully select pump body materials, such as cast iron, 304/316 stainless steel, ceramic bearings, etc. All raw materials must provide material reports before entering the factory, and pass spectral analysis and hardness tests. Key components such as pump shafts, impellers, and seals must also undergo multiple strict tests such as size, tolerance, and corrosion resistance to ensure that the product controls quality from the source and guarantees quality.
Precision manufacturing
We use CNC machining centers and follow strict process standards to ensure key dimensional accuracy. Generally speaking, the shaft concentricity of the pump is: < 0.02 mm, the impeller balance level is: ISO G6.3 (dynamic balance), and the flange surface flatness is: < 0.05 mm. These precision manufacturing ensures smooth operation, minimal vibration, and long bearing life.
Assembly standards and torque control
Each impeller is dynamically balanced before leaving the factory, and the balance level meets the ISO G6.3 standard, effectively reducing vibration and noise, and adapting to various continuous operation conditions.
Pressure and seal test
Mechanical seals are tested for flatness, concentricity, and assembly pressure to ensure zero leakage-ideal for demanding liquid transfer. Pump casings undergo 1.5× water pressure tests and airtightness checks, ensuring no leaks or pressure drops before shipment.
Batch Consistency
A comprehensive QC system (IQC, IPQC, FQC, OQC) ensures consistent performance, appearance, and packaging across every batch.
Our Services – We Support You at Every Step
Pre-sales support
Our engineering team can provide technical consultation during the design phase.
In-sales support
We provide detailed centrifugal pump drawings and performance data, and can adjust specifications or suggestions based on project needs or customer feedback.
Responsive after-sales service
We try our best to respond to all questions within 24 hours, and our team is always ready to help you with any emergency.