What is Free Forging for Flanges in Forged Flanges:
The basic process for forged flanges, when they are produced through free forging, involves shaping the forgings gradually through several fundamental deformation processes. The essential steps in free forging are upsetting, drawing, punching, bending, and trimming. Below are some of the procedures involved in forging flanges:
1. The raw material is bent into a specific angle or shape through a forging process.
2. Cutting, splitting, or removing the material head in a forging process.
3. Upsetting is a process of reducing the height of the raw material along the axial direction and increasing the cross-sectional area. It is often used in the forging of gear blanks and other disk-like forgings. Upsetting can be classified as full upsetting and partial upsetting.
4. A forging process in which part of the steel blank is rotated relative to another part at a certain angle.
5. Drawing is a forging process that increases the length of the blank while decreasing the cross-sectional area. It is typically used for machining shaft-type parts like lathe spindles and connecting rods.
6. Punching involves using a punch to create through-holes or non-through holes in the blank.
Common Flange Failures:
In continuous industrial production, flanges are subjected to factors such as corrosive media, erosion, temperature, pressure, and vibration, leading to inevitable leaks. Flange leaks often occur due to errors in machining dimensions of sealing surfaces, aging of sealing components, improper installation, and improper fastening. Failure to address flange leakage promptly can result in significant material losses and damage to the production environment, leading to production stoppages and substantial economic losses. Leaks of toxic, hazardous, flammable, or explosive media can also result in poisoning, fires, explosions, and other serious accidents.
Traditional methods for addressing flange leaks involve replacing sealing components and applying sealants, or replacing flanges and pipelines. However, these methods have significant limitations, particularly when dealing with flammable and explosive environments where safety is a concern. Currently, polymer composite materials are widely used for on-site sealing, with the Foseal system being one of the mature systems. This approach offers simplicity in construction, safety, and low cost. It resolves most flange leakage issues, eliminates safety hazards, and saves on maintenance expenses for businesses.
Features of High-Pressure Flange-Connected Steel Gate Valves:
High-pressure flange-connected steel gate valves are suitable for water, oil, and steam applications. They are used to cut off or connect pipelines in petroleum, chemical, thermal power plants, and more. These valves have a rated pressure of PN10.0~25.0Mpa, working temperatures ranging from -29°C to 600°C, and are available with manual, gear drive, and electrical operation modes.
1. High-pressure flange-connected steel gate valves comply with advanced national and international standards, providing reliable sealing, excellent performance, and an appealing appearance.
2. The gate valve seat sealing surface is made of iron-based alloy welding or tungsten-chromium-cobalt alloy welding, offering wear resistance, high-temperature resistance, corrosion resistance, scratch resistance, and a long service life.
3. Various pipeline flange standards and flange cover types can be used to meet various engineering requirements and user needs.
4. The gate valve uses a wedge-shaped resilient gate valve structure with roller bearings for medium to large diameters, ensuring low friction and easy opening and closing.
5. The stem of the high-pressure flange gate valve is surface nitrided, providing excellent corrosion resistance and scratch resistance.
