The valve connection surface structure directly affects the valve sealing performance, installation method and reliability in pipeline system. TWS will briefly introduce the mainstream connection forms and their characteristics in this article.
The universal connection method achieves sealing through bolted fastening of paired flanges.
Common sealing surface types:
-Protruding surface: The most common design, with a sealing surface protruding 2-3mm, suitable for a wide pressure range (PN10-PN25).
-Concave-convex surface: better sealing performance, suitable for flammable and toxic media.
-Groove surface: best sealing, used for extremely dangerous media and high pressure conditions.
-Ring connection surface: Metal ring gasket, designed for high-pressure and high-temperature applications. Advantages: Reliable sealing and easy disassembly.
Disadvantages: large volume and weight, high cost.
II. Wafer Connection
The valve features a non-flanged design, secured by long bolts between pipe flanges. Key characteristics include a compact structure, lightweight construction, and cost-effectiveness. However, it requires high installation standards and is difficult to maintain. This design is widely used in butterfly valves and check valves.
III. Threaded Connections
Threaded connection is a mechanical connection method which uses threaded fasteners to connect parts and can be disassembled at any time.
Advantages of sealing: The large-scale production makes the manufacturing cost extremely low, which is one of the most cost-effective connection methods.
Disadvantages: It is easy to loosen under vibration and impact load, and the stress concentration at the root of the thread makes its fatigue strength low.
IV. Welding Connections
The most reliable permanent connection.
-Type: Butt welding: High strength, low fluid resistance, suitable for harsh working conditions.
-Plug-in welding connection: Easy to install, suitable for small-diameter pipes. Advantages: Zero leakage, vibration-resistant.
Drawbacks: 5. Disassembly difficulty. Other connection types: Clamping connections: Used in sanitary industries for easy cleaning. Sleeve connections: Used in instrumentation and hydraulic systems.
Selection points:
1. Select the method according to pressure and temperature: high pressure and high temperature should be welded or ring connection.
2. Based on the medium characteristics: For hazardous media, welding or tenon-joint surfaces are recommended.
3. Consider installation and maintenance: Frequent disassembly of flange connection.
4. Cost and Space: The wafer is economical and compact.
V. Conclusion ：
The right connection is key to pipeline safety and performance. Get expert guidance and competitive quotes on our butterfly valve, gate valve, and check valves. Contact TWS to find the perfect solution for your needs.
Post time: Nov-25-2025
