Traceability of AVK gate valves for gas
All AVK valves are manufactured in our own state-of-the-art factories and thorough tests are carried out to safeguard the traceability, durability and operational reliability. For all AVK gate valves for gas, we offer full traceability on processes and materials.
1. Inspection of incoming goods
Mechanical properties and critical dimensions of cast materials are checked in a local AVK test laboratory before the items are shipped to our factory. Supplier performance is monitored, and the number of items for inspection is automatically calculated and regulated according to the results from previous deliveries.
It is checked that a 3.1 certificate is available for each production batch.
The graphite structure of the casting is examined by microscopy on samples taken from each batch. Microscopy control reports are archived and can be traced to the individual casting batches.
2. Welding inspection
All welds on steel castings are performed by welding robots according to procedures prepared in collaboration with an external accredited welding coordinator.
Welds are inspected with X-ray examination by an external, certified inspector according to:
• EN ISO 17636-1:2013/
• EN ISO 10675-1:2016.
All welding inspection reports are archived and can be traced via the valve serial number.
3. Inspection of bolts and steel rods
Mechanical properties of bolts and steel rods for valve stems are checked by tensile test.
Control reports are archived.
4. Inspection of corrosion protection
Quality control is performed on samples from all batches.
Epoxy inspection:
• Layer thickness is measured – must be min. 250 µm
• Impact resistance and adhesion tests
• High voltage test for breakthrough at 3 kV
• Cross linkage test
PUR inspection:
• Layer thickness is measured
– must be min. 1500 µm
• High voltage test for breakthrough at 20 kV
• Adhesion test
Control reports are archived.
5. Pressure testing
All AVK valves for gas are pressure tested before leaving the factory.
• Shell strength tested at 24 bar
• Shell test for leakage at 17.0 bar
• Closing function tested for leakage at 17.6 bar and 0.5 bar
• Functional test of maximum operating torque
All reports on pressure tests are archived and can be traced via the valve serial number.
6. Serial number and 3.1 certificate
All valve stems are permanently marked with a unique serial number. The serial numbers are registered on customer orders.
3.1 certificates according to EN 10204 can be issued for all AVK gas valves.