From start to finish..

Close co-operation with customers in the fields of water and gas supply and sewage treatment has given AVK a thorough knowledge of these sectors´ requirements and this is clearly reflected in the innovative design of the products. Ideas and suggestions from many different countries are considered centrally in order to obtain the best possible result for all markets.

Registration of incoming material

A close co-operation with and control of the subsuppliers ensure that they meet the quality demands. Through spot tests and registration of all incoming components a quality sampling of the subsuppliers is made to ensure optimum efficiency and a reliable supply.

Component production

The components are machined according to drawings with detailed control instructions. Each operator is responsible for spot testing and completion of control papers. The measurement tools are calibrated by an external supplier according to fixed procedures.

Machining of valve stems

The threads are rolled in a separate coldpressing process to maintain the steel structure and increase its strength. Furthermore this method ensures smooth thread edges and consequently low operating torques.

Blast cleaning

All castings are blast cleaned ensuring that any unevenness in the surface of the castings is fully cleaned. This process ensures optimum adhesion of the coating.

Epoxy coating

AVK valves are as standard provided with epoxy coating according to DIN 30677. The epoxy is applied electrostatically in an enclosed booth, where the powder melts and cures on contact with the cleaned and preheated casting. Thorough control of layer thickness, adhesive strength and impact resistance is made to ensure optimum corrosion resistance.

Internal enamel lining

The ceramic lining is very suitable for use with untreated water or water with additives. The completely smooth surface prevents impurities from rooting and diminishes the risk of creeping corrosion due to the chemical compound of casting and enamel.

* Available only on selected products

External polyurethane coating

The 1.5 mm thick tar coating is very suitable for installation in aggressive soils, and furthermore to provide cathodic protection. This type of coating is used especially for gas valves.

Product testing

All valves are pressure tested before they leave the factory. The testing is carried out in accordance with DIN 3230, part 4 for water and part 5 for gas. This is the customers´ guarantee for 100% tight valves.

Final inspection and packing

Before dispatch the coating finish and conformity between product and item number is inspected. The valves are packed in wooden pallets with corrugated cardboard carefully placed between the valves to prevent damage of the coating during transportation. For extra protection the valves can be delivered with plastic bonnet and flange protectors.