PROFESSIONAL MANUFACTURER
Quality Control
At China Loong Butterfly Valve Co., Ltd., quality control is integrated into every stage of manufacturing and order fulfillment. Our approach supports the consistent production of butterfly valves, high performance butterfly valves, ball valves, gate valves, globe valves, check valves, angle valves, needle valves, shutoff valves, Y-strainers, and related joints and flanges for international industrial applications.
1. Incoming Material Inspection
Materials and purchased components are reviewed before they enter production. Inspection activities are carried out according to product specifications, purchasing requirements, and internal inspection standards.
- Verification of material type, dimensions, and identification where applicable
- Visual inspection of castings, forgings, valve bodies, discs, stems, seats, seals, and other components
- Review of relevant supplier documents and material information when required
- Checking of sealing surfaces, connection dimensions, and component condition
2. In-Process Quality Control
Production teams monitor key operations throughout machining, assembly, finishing, and testing. Process checks help maintain dimensional consistency, correct assembly, and reliable valve performance across different product types and specifications.
- Dimensional checks for critical machined parts and connection areas
- Control of machining accuracy, surface condition, and component fit
- Verification of assembly orientation, fastening, actuation, and sealing components
- Process inspection based on product drawings, technical requirements, and applicable internal procedures
3. Finished Product Inspection
Before release, finished valves and related products are inspected to confirm that they conform to the approved order requirements. The inspection scope is adjusted according to product type, size, materials, configuration, and customer specifications.
- Appearance, workmanship, marking, and overall product condition
- Dimensions, flange or threaded connections, and interface compatibility
- Operating function, opening and closing performance, and assembly integrity
- Pressure, leakage, or other functional checks when required by the product specification
- Inspection of butterfly valves, ball valves, gate valves, globe valves, check valves, strainers, and other products according to their specific quality characteristics
4. Packaging and Pre-Shipment Check
Packaging and shipment preparation are treated as important parts of quality assurance. Products are checked before dispatch to help protect them during handling, transportation, and storage.
- Confirmation of product quantity, model, size, and configuration
- Protection of sealing surfaces, flanges, threads, actuators, and other vulnerable areas
- Verification of labels, shipping marks, and customer-specific identification requirements
- Review of packing condition, accessories, documentation, and shipping details before release
5. Feedback and Continuous Improvement
Quality information from inspections, production activities, customer feedback, and service communication is used to identify opportunities for improvement. When an issue is found, the responsible teams review the cause, implement appropriate corrective actions, and follow up on the result.
Through ongoing process review, supplier coordination, employee communication, and refinement of inspection procedures, China Loong Butterfly Valve Co., Ltd. works to improve product consistency and provide dependable valve solutions for industrial customers worldwide.
Main Products
China Loong Butterfly Valve Co., Ltd. develops and supplies industrial valves and fluid-control products for water, HVAC, process piping, and general industrial systems. We serve distributors, contractors, equipment manufacturers, and project buyers with practical solutions, consistent quality control, and stable supply.
Our core range supports reliable isolation and flow regulation across different pipeline designs. The Butterfly Valve range provides a compact option for water and HVAC applications, while Ball Valve products support dependable shutoff. For larger pipeline systems, our Gate Valve solutions offer a practical choice for on-off service.
We also provide products for backflow prevention, process control, and varied installation requirements. Check Valve designs help support controlled flow direction in water and process systems, while Globe Valve products are suited to applications requiring more regulated flow. Complementary valve and piping solutions can be selected according to media, pressure, connection, and operating conditions.
China Loong Butterfly Valve Co., Ltd. supports OEM and ODM cooperation for distributors, brands, and equipment partners. We can work with customers on product specifications, materials, dimensions, actuation, surface finish, markings, packaging, and configuration, with communication and quality control throughout production to support dependable long-term supply.
