Flanged Valves vs Threaded Valves

Flanged Valves vs Threaded Valves

Figure 1: Flanged (left) and threaded valves (right)

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Flanged and threaded valves are integral components in various industries. Selecting the appropriate valve type involves evaluating aspects such as pressure, temperature, installation complexity, spatial constraints, and cost-effectiveness. This article delves into the characteristics of both valve types, providing insights to help you choose the right one for your application.

Flanged valves

Flanged valves are equipped with flanges at the ends. A flanged connection typically includes a gasket between materials to prevent leaks, joined together with bolts or sometimes welded. Flange designs include slip-on flanges, lap-joint flanges, weld-neck flanges, and socket-weld flanges.

• Used extensively in industries such as oil and gas, chemical processing, power generation, and water treatment.
• Adhere to industry standards like ANSI/ASME B16.5, DIN 1092-1/ISO 7005, and SAE J518, ensuring proper dimensions, materials, and technical specifications.
• Flange ratings, such as Class 150, Class 300, and Class 600, indicate varying levels of pressure and temperature resistance.

Advantages

• Versatility: Suitable for different pipe sizes and materials like steel, cast iron, and PVC, and effective with hazardous fluids.
• Easy to remove: Can be removed without disassembling other system components.
• Strength and durability: Enhanced by the nature of the flanged connection, making them suitable for high-pressure and high-temperature applications.

Limitations

• Cost: More expensive due to the need for bolting and gasket replacement.
• Size: Bulkier and larger, which may not be ideal for confined spaces.

Figure 2: Flanged valves used in an industry

Threaded valves

Threaded valves feature threaded ends for direct connection to compatible pipes or fittings. Standardized threads, such as BSP, NPT, and UTS, ensure compatibility and ease of maintenance. They are commonly utilized in plumbing systems, small-scale industrial processes, and residential applications.

Advantages

• Simplicity: Easy to install and replace without special tools, no need for bolt tightening.
• Compact: More lightweight and compact, fitting well in tight spaces.
• Cost-effective: Less expensive due to the absence of multiple parts and complex configurations.
• Vibration tolerance: Better stability and reduced risk of loosening under mechanical stress.

Limitations

• Limited stress tolerance: Not suitable for high-pressure and high-temperature scenarios.
• Corrosion: Threads are more prone to corrosion, complicating removal and potentially weakening the connection.
• Potential leakage: Can wear or loosen over time, necessitating regular inspection and maintenance.

Comparison table

Table 1: Flanged valves vs threaded valves

FAQs

What is the difference between flanged valves and threaded valves?

Flanged valves connect using bolts via flanges, whereas threaded valves screw directly onto the pipeline.

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Which type of valve is more commonly used in industrial applications, flanged or threaded?

Flanged valves are preferred in industrial settings due to their ability to handle higher pressures and larger pipe sizes.

Flanged Ball Valves

Learning More About Flanged Ball Valves

Flanged ball valves are used to control the flow of an operating medium from both directions. They are designed to be simple and compact, often providing a cost-effective solution for flow control applications. These valves are an excellent alternative to diaphragm and lined plug valves.

A flange ball features a control spindle that manages the ball's position from open to closed. The valve seals without leakage by pushing the ball against the non-pressurized side of the seal. However, it can only be fully opened or closed to avoid seal damage. Proper design ensures effective function under the right pressure and temperature conditions, preventing leakage and subsequent equipment corrosion. Any failure impacts the entire system, infrastructure, and environment.

Flanged ball valves come with fixed flanged connections that ease operation and offer benefits like minimal pressure drop, bidirectional flow, positive leak-tight closures, and swift operation. These valves can be made from durable materials like stainless steel, lined steel, polymer, alloy, chromium, titanium, and cast iron, with some compositions offering exceptional resistance to corrosion and abrasion.

Reputable manufacturers rigorously test flanged ball valves before distribution. These valves find applications in various industrial settings such as energy supply, steelworks, pipeline construction, power stations, wastewater treatment, chemical storage, pharmaceuticals, metal treatment, mining, power generation, and agrochemicals. High-performing models are ideal for handling corrosive substances like alkalis and strong acids. Installation flexibility adds to their appeal, provided proper fitting standards and practices are followed.

To minimize failure and unplanned maintenance, choose quality flanged ball valves. Failure can disrupt operations and escalate costs unnecessarily.

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