Seat ring

The seat ring is an essential component in industrial valves and plays a crucial role in sealing and controlling the flow of media. It is located inside the valve body and serves as a contact surface for the closing element (e.g., ball, cone, or diaphragm) to regulate or completely block the flow of the medium.

Seat ring design and materials

The seat ring is typically circular and is installed in the valve seat. It is made of materials that are specifically selected for the requirements of the respective process. These materials must be both corrosion and wear resistant in order to withstand mechanical and chemical stresses. Common materials include:

• Metals (e.g., stainless steel, brass, bronze): These are used in high-pressure and high-temperature applications where high mechanical strength is required.
• Plastics (e.g., PTFE, PEEK): These are used for applications that require high chemical resistance or low friction.

Function of the seat ring in valves

The seat ring provides a precisely sealed contact surface for the valve’s closing element. When the valve is closed, the closing element presses against the seat ring, completely blocking the flow. When the valve is opened, the closing element lifts off the seat ring and the medium can flow freely through the valve.
The tightness between the closing element and the seat ring is crucial for the functionality of the valve. Poor sealing would lead to leaks, which is unacceptable in many industrial processes. Therefore, the seat ring must be manufactured with extreme precision to ensure reliable sealing.

Areas of application for the seat ring

The seat ring is an indispensable component in various types of valves, including:

• Ball valves: Here, the seat ring sits around the ball to stop the flow when the ball is in the closed position.
• Cone valves: In cone valves, the seat ring provides a conical contact surface to regulate or block the flow.
• Diaphragm valves: The seat ring is used to ensure that the diaphragm provides a tight seal when it comes into contact with the valve seat.

Advantages and requirements for seat rings

• High tightness: The seat ring ensures a precise seal and prevents leaks, even at high pressures or with aggressive media.
• Wear resistance: Due to constant contact with the closing element and the medium, the seat ring must have high mechanical and chemical resistance.
• Durability: In demanding industrial applications, the seat ring must function reliably even under extreme conditions and offer a long service life.

Conclusion

The seat ring is an indispensable component in valves, responsible for sealing and controlling the flow. Through the use of high-quality materials and precise manufacturing, the seat ring ensures that the valve performs its function reliably, prevents leaks, and works flawlessly under a wide range of conditions.