The cast iron valve spray coating consists of several steps. First, the valves are cleaned to remove surface dirt, grease and metal residue. Then, the valves are hung for preheating to enhance the adhesion of the powder coating. Next, workers will use electrostatic spray guns to apply the spray coating, which electrically charges the powder particles so they adhere to the valve surface. Finally, the valves are further baked to cure, resulting in a durable and smooth surface.



For the spray coating of the valve surface, the thickness is usually between 100-250 microns. This thickness ensures the durability and corrosion resistance of the coating. Since the thicker the coating, the higher the production cost, valve orders usually specify only the minimum thickness. If you have special needs, our sprayed surfaces can be up to 700 microns, but excessively thick coatings are prone to knocking off and also affect the aesthetics of the valve.



How to judge the quality of spray coating on valves? Firstly, you can see from the appearance, a good spray coating surface is smooth and even, no obvious defects, such as bubbles, dripping or uneven coverage. Especially at the seal is not allowed to have debris to avoid sealing damage to affect the sealing performance. The second is to use the coating thickness gauge test to avoid uneven powder spraying, in the valve bonnet connection end and flange edge is prone to spray coating too thick.



Some customers require valves to be WRAS certified, which is a British accreditation that ensures that the valve meets the necessary standards for use in contact with potable water, and the powder and gaskets used by Qingdao Fluido are WRAS certified to ensure that the valves comply with the WRAS requirements. If you have this requirement you can contact us for more information.