Uncompromising Quality Standards
Quality is not just a checkbox at ZOVIAN — it's embedded in every step of our manufacturing process. From incoming raw material inspection to final dispatch, our rigorous quality control system ensures every valve meets or exceeds specified standards.
Our quality management approach follows a systematic, process-oriented methodology aligned with national and international standards including IS, BS, ISO, and API.
Our Quality Control System
Incoming Material Inspection
All raw materials including castings, forgings, and bought-out items are inspected against material test reports (MTR) and dimensional inspection criteria before being accepted for production.
In-Process Quality Control
At each manufacturing stage, dimensional inspection is carried out to ensure compliance with drawing tolerances. Critical dimensions are verified using calibrated measuring instruments.
Assembly Inspection
After assembly, the valve is inspected for correct assembly, smooth operation, proper gland packing, correct stem threading, and visual appearance before moving to testing.
Hydrostatic Shell Test
Every valve is subjected to a hydrostatic shell test at 1.5x rated pressure for a duration as specified in the applicable standard. This verifies the integrity of the pressure boundary.
Seat Leakage Test
After the shell test, a seat leakage test is conducted at rated pressure to verify the sealing performance of the valve seat and disc/gate/disc interface.
Final Inspection & Certification
A final inspection is carried out covering visual examination, dimensional spot check, marking verification, and documentation review before issuing the test certificate and dispatching.