Quality

QUALITY EQUIPMENT AND QUALITY CONTROL PROCESS

All valves are manufactured in compliance with a rigorous quality management system, supported by reliable inspection apparatus and a professionally trained quality control team. For QILONG, product quality is regarded as the paramount commitment to all customers.

A dedicated in-house quality control laboratory is established, equipped with comprehensive testing facilities for impact test, hardness test, tensile test, as well as chemical composition analysis and mechanical property detection.

1. Raw Material Control for Valves
Visual inspection, dimensional verification, positive material identification (PMI), wall thickness measurement, impact test (as per customer's request), and non-destructive testing (NDT) including penetrant testing (PT), ultrasonic testing (UT), magnetic particle testing (MT) and radiographic testing (RT).
2. Machining Process Inspection for Valve Components
Dimensional accuracy inspection, machined surface quality verification, component material confirmation, and non-destructive testing (NDT) implemented in accordance with special customer requirements.
3. Assembly and Performance Inspection for Valves
Each individual valve undergoes hydraulic pressure test and pneumatic pressure test, with all performance inspections strictly executed in accordance with the specified standards of the purchase order.
4. Coating, Packaging and Delivery of Valves
Stringent quality inspection is carried out for the surface coating, standardized packaging and ex-warehouse delivery of all valves to ensure the intact delivery of products to customers.