01
Pre-coated Resin Sand Castings for Valves
Material
Pre-coated resin castings on valves will have more abrasion-resistant material with high corrosive resistance, i.e.:
• Carbon Steel: Carbon steel is high in both its strength level as its durability. Carbon steel is generally utilized in those parts that have a high impact resistance requirement.
• Stainless Steel: Suitable for those in corrosive surroundings, stainless steel is heat-resistant as much as it is rust-resistant.
• Alloy Steel: Suitable for those which are designed to be withstanding high-stress application, alloy steel is particularly suitable in case of heavy-duty application valves.
• Bronze and Brass: They are both corrosive-resistant, making them appropriate in marine, water treatment, as well as corrosive application.
Specifications
• Casting Weight: Roughly from small, highly detailed pieces up to more massive, bulkier pieces.
• Tolerances: High-precision tolerancing is achieved, often at ±0.5mm or better, with varying complexity in component.
• Surface Finish: The pre-coat castings have a highly smooth surface that helps in reducing machining requirements that are essential in case-castings.
• Pressure Rating: The body of the valve is made suitable according to its application in terms of its intended application, either high or low.
Production Processes
1. Pattern Preparation: The design of the valve is toughened into a pattern from which a metal or a resin core is traditionally made.
2. Pre-coating: The pre-coat is sprayed on the resin sand with a specialized binder in order not to allow deforming of the mold at high temperatures.
3. Molding: The pre-coat is packed into a pattern around which a highly detailed mould is fashioned. The operation is given a high surface finish with minimal shrinkage.
4. Drying: The mold is dried to harden the resin coating and ensure strength during pouring.
5. Pouring: Molten metal is poured into a ready mold in order to create the valve component.
6. Cooling and De-slagging: The mould is cracked once cooled, with de-moulding release followed by deburring as well as its de-slagging.
7. Finishing: Final surface treatments, i.e., surface finishes in terms of coating or polishing, are involved in order to achieve accurate requirements.
Quality Test & Inspection
• Visual Inspection: Visual inspection is made in its entirety in order to examine surface defects, crack, or flaws.
• Dimensional Checks: The castings are dimensionally checked in a manner that it is in conformity with specified fit as well as functional requirements.
• Mechanical Testing: The cast is subjected to tensile strength, hardness, and impact resistance testing in order to meet its necessary performance requirements.
• Non-Destructive Testing: Methods like ultrasonics or X-rays are utilized in an attempt to spot internal defects with no damage on the casting.
• Pressure Testing: The body of the valve is pressure tested in order to ensure that it can achieve operational pressures.
Key Features
• High Precision: The pre-coat cast process achieves high precision dimensions with minimal machining.
• Superior Surface Finish: Has a high surface quality that keeps additional surface finishes at a minimal.
• Durability: The manufacturing process as well as material are made tough, rust-resistant, and durable in order to have extended operation in abusive surroundings.
• Versatility: Can be applied on a range of valve styles, from globe, ball, and gate valves in a range of sizes as well as ratings.
• Customization: Capable of manufacturing customized valve bodies with complex geometry and highly detailed design.
Packaging and Storage
Castings are carefully packaged to avoid damage during transport. Protective coatings may be applied to prevent corrosion. Cast components are stored in a dry, temperature-controlled environment to maintain their integrity before shipping.
Shipment
Once thoroughly inspected and thoroughly tested, castings are exported globally with reliable tracking in order to deliver on time. All shipments have included necessary certificates as well as examination reports, giving complete openness regarding the quality of the casting.