PROTECTIVE COATINGS THE VAMEIN BUTTERFLY VALVES

The standard finishes on VAMEIN butterfly valves protect the valve from the fluid that will be run through it and from the atmosphere it will be exposed to.

Before all the parts of the valve are painted, either through RILSAN ® or kataphoresis, they are blasted and degreased to ensure good adherence of the coating.

BODIES

The body of the valve starting from DN-50 mm (2") to DN-300 mm (12") is covered with RILSAN ® , blue colour polyamide B-11 (RAL 5010 approx.) , with an approximate thickness of 0,25 mm.

The Rilsan Process

From DN-350 mm (14") the body is covered with a Zinc Phosphate epoxy-priming coat which is then covered with a layer of blue colour RAL 5010 polyurethane enamel. The final thickness is between 60 and 80 µ.

DISCS

It is standard procedure that all ductile iron, and carbon steel discs from DN-50 mm (2") to DN-300 mm (12") are covered in RILSAN ® , black colour polyamide B-11 (RAL 9011 approx.), with an approximate thickness of 0,25 mm. DN-350 mm (14") discs and above can also be done on request.

It is also standard procedure that all discs from DN-350 mm (14") in ductile iron and carbon steel are covered in Zinc Phosphate epoxy priming coat with a total thickness between 30 and 40 µ , which is then covered in a black colour RAL 9011 layer of polyurethane enamel with the same thickness.

All discs between DN-50 mm (2") to DN-600 mm (24") in ductile iron, cast iron and carbon steel can be processed with an electrolytic black colour RAL 9011 treatment so called KATAPHORESIS having an approximate thickness between 35 and 40 µ. These discs are available on request.

Stainless steel discs are dry abrasive blasted having their edges polished in all diameters. DN-50 mm (2") to DN-300 mm (12") can be mirror polished, on request.

Bronze and aluminium bronze discs are dry abrasive blasted having their edges polished in all sizes. Again, from DN-50 mm (2") to DN-300 mm (12") can be mirror polished, on request.

VAMEIN DE ESPAÑA, S.A. can apply various finishes to their valves according to the customer's specifications i.e. chrome, nickel, PFA, PTFE, Hallar, enamel, special printing, etc.

The Rilsan Process

Rilsan main features.

The Rilsan Process Description.

The parts to be RILSAN ® coated, once they have previously been cleaned of impurities and grease, are put into an oven until reaching the necessary temperature depending on the mass of the part. Then they are dipped into a fluidified RILSAN ® bed until reaching the required thickness by transference of temperature between the part and RILSAN ® product. Once this process is over, the parts are hung up to let them get cool for their assembly or storage. RILSAN ® product remains permanently fixed on each part contacted.

Rilsan ® , as a coating for products to be in contact with drinking water intended for human consumption, is among others approved by the following Companies: F.F.D.A., NSF, WRC, DGS, DWI, DWGW .

RESISTANCE OF RILSAN ® TO SOME IMPORTANT CHEMICAL PRODUCTS. Download -

Kataphoresis

HIGH THICKNESS KATAPHORESIS PAINTING DESCRIPTION

The KATAPHORESIS, technically named "POWERCROWN (R) 640", has a Catonic Epoxidic quality and belongs to the fourth generation of Kataphoresis Epoxy. It is black colour and medium gloss. It is a painting system carried out by immersion. By means of an electric current there is a removal of painting particles from the cathode towards the part to be coated.

Kataphoresis Epoxy

In the KATAPHORESIS or cathodic electrodeposition, the following main elements for the microcrystalline trication process take part:

ELECTROLYSIS: Dissociation of the bath electrolyte by means of an ion discharge.

ELECTROPHORESIS: Transport of particles in suspension.

ELECTROOSMOSIS: Displacement of the liquid stage through the light film of paint which is being formed.

The result of this process is wholly effective against corrosion and guarantees its thickness homogeneity.

Kataphoresis Epoxy

HIGH THICKNESS KATAPHORESIS PREVIOUS PROCESS DESCRIPTION

Previously to the painting stage, the parts are put into a processing tunnel in order to get a tricationic microcrystalline phosphate coat between 1,6 y 2 gr/m². The following stages are carried out by sprinkling:

Grease removal.

Washing.

Phosphatising.

Washing.

Demineralised water washing.

Then, the parts are painted by means of the black colour cathodic electrodeposition inside the KATAPHORESIS barrel. Later on, they are put into a washing tunnel with ultrafiltering system. Finally, they are washed with demineralised water. Drying time is 20 minutes at 165 ° C.

PROPERTIES OF THE HIGH THICKNESS KATAPHORESIS COATING

APPEARANCE: The dry film gives an even appearance, with no drops, craters or any defects.

STICKING: No unstitching happens after grid scratch.

THICKNESS: Wholly even. Between 35 and 40 µ.

PERSOZ HARDNESS: Results are above 190 seconds.

HUMIDITY RESISTANCE: No superficial corrosion after 1.000 hours of exposure.

SALT SPRAY RESISTANCE: No superficial corrosion after 800 hours of exposure. (S/ASTM B 117).

MAXIMUM TEMPERATURE OF USE: Up to 180 ° C under continuous use.