How Dervos control valve quality? It should go back to valve production procedure. Valve production includes four steps: casting, machining, assembling, painting and packing. Make sure the five steps qualified, valve quality could be guaranteed.

Dervos quality checking team are professional, experienced and principled. They have solid valve knowledge and are familiar with standards and inspection requirements. They could make sure these 5 steps qualified.

-Casting checking. The QC team would check casting item by item from appearance, wall thickness, quantity, size and original material report from foundry according to international standards to avoid the unqualified ones. 

-Machining checking. During this period, QC team will check machining accuracy, face to face dimension, flange drilling to find potential problems as early as possible.

-Assembly checking. After assembly, QC will do an overall test to the valve. Visual checking includes cleanness of inner chamber, bright and clean appearance, and clear marking on the body. Dimension checking contains face to face dimension, the critical dimension of connection end. Pressure testing includes hydrostatic testing of sealing and body and air test to the sealing.

-Painting & Packing.The painting color and spraying effect will be checked. QC will make sure packing is per Dervos standard. The clean valve is placed orderly in strong wooden box with clear shipping mark by filling enough soft material to avoid collision.

-Reports. After shipment, you will get 2 reports. One is inspection report and the other one is material testing report.

Years of valve exporting experiences and continuous improvements, the system came into being. Dervos will continue to work hard and become perfect.