Valve Powder Coating

Surface Finish Options Overview

Characteristics of Valves

Valves typically have the following characteristics:

Thick and uneven walls

Irregular shapes

Rough surfaces

High thermal inertia, leading to slow temperature rise

Severe collisions during handling

Due to these characteristics, using conventional powder coatings often results in various issues. Our company has developed a specialized powder coating for valves through material selection and experimentation. This valve-specific powder coating not only offers the usual decorative appeal but also has the following outstanding features:

Excellent Adhesion, Impact Resistance, and Surface Scratch Resistance: The coating will not be damaged during normal handling and collisions of valves.

Low-Temperature Curing: The baking conditions are 160°C for 15-20 minutes or 180°C for 10 minutes. Compared to conventional powder coatings that require 180°C for 15-20 minutes, this coating improves spraying efficiency and saves energy.

High-Gloss Coating: The high-gloss powder coating for valves has excellent leveling properties, no sagging, good coverage, and excellent edge coverage. The coating thickness can be around 100 µm.

Defoaming for Cast Iron Valves: This coating effectively addresses defoaming issues for cast iron valves.

Improved Powder Transfer and Coverage: By adjusting the powder particle size and introducing new materials in the formulation, the Faraday cage effect is mitigated, resulting in better powder transfer and larger coating area.

Customizable Gloss and Texture: The coating can be tailored to meet customer requirements for various gloss levels and textures.

Powder and Coating Performance Results

Applications

Valves

Other industrial components with similar characteristics

Types of powder coating

Powder coatings can be categorized by resin system (epoxy, polyester, hybrid, polyurethane), appearance (smooth, texture, hammer, metallic, pearlescent), or performance level (anti-corrosion, heat-resistant, UV-resistant, architectural grade, automotive grade).

Powder coating colours and effects

Powder coatings offer thousands of colors in gloss, matte, satin, metallic, candy, texture, wrinkle, hammer tone, wood grain, fluorescent, and other custom effects. Special powders can create soft-touch, anti-scratch, anti-fingerprint, or anti-graffiti surfaces.

Powder coating process

The process generally includes surface pretreatment (degreasing, phosphating, chromating, sandblasting), drying, electrostatic spraying, curing in an oven, and cooling. A well-controlled pretreatment and curing process ensures strong adhesion and long service life.

Powder coating benefits

Powder coatings are environmentally friendly, solvent-free, and produce minimal waste. They offer excellent corrosion resistance, weather durability, mechanical strength, and uniform film appearance. The coating is tough, impact-resistant, scratch-resistant, and has a long lifespan.

Applications for Powder Coatings

Powder coatings are widely used in appliances, aluminum profiles, architectural components, automotive parts, bicycles, furniture, outdoor equipment, machinery, electrical cabinets, pipeline systems, and general industrial and consumer goods.

FAQ

What is Powder Coating?

Powder coating is a dry finishing technology where finely ground powder is electrostatically sprayed onto a metal or non-metal surface and then cured at high temperature. After curing, the powder melts into a continuous, durable, and decorative coating layer.

What does powder coating do?

Powder coating protects the substrate from corrosion, weathering, chemical attack, and mechanical wear. It also provides decorative appearance with rich colors, gloss levels, textures, and special effects.

Is powder coating better than paint?

In many industrial applications, powder coating outperforms liquid paint. It forms a thicker and tougher coating, resists corrosion and chemicals better, and does not contain VOCs. It also provides excellent consistency and cost-effective mass production.

Why is it called powder coating?

It is called powder coating because the coating material is a solid powder instead of a liquid paint. The coating is formed by melting and curing powder particles under heat.

What are the different types of powder coating?

Powder coatings include several families depending on resin chemistry:

• Epoxy powders

• Polyester powders

• Epoxy-polyester hybrid powders

• Polyurethane powders

• Acrylic powders

• Fluorocarbon (PVDF) powders

Each type has its own performance features such as corrosion resistance, UV resistance, chemical resistance, outdoor durability, or decorative properties.

Which material is used in powder coating?

Powder coatings are based on thermoset or thermoplastic resins combined with pigments, curing agents, fillers, additives, and in some cases metallic or effect particles. Common substrates include steel, aluminum, galvanized metal, MDF, and certain heat-resistant plastics.

How long will powder coating last?

The lifespan depends on powder type, film thickness, application method, pretreatment, and service environment. Indoor coatings can last more than 10–20 years. High-grade outdoor polyester or fluorocarbon powders can last 15–25 years or longer under UV exposure.