What is a Seat On a Valve

2021-08-15

For the safety and efficiency of a variety of processes, we rely on the performance of butterfly valve. How sound a butterfly valve is depends on the integrity of the seal.

The valve must be able to withstand the particular working conditions of any given process. Such conditions involve elements that are corrosive, extremely hot, or high pressure. The seal must resist wear and tear with repetitive opening and closing.

The integrity of the seal depends on the butterfly valve seat. That’s why you must choose one that is appropriate for the conditions of the process. With this guide, you will learn which butterfly valve seat is suited for which process. 

Essentially, a valve seat is where the moving component of a valve rests when in the closed position. In butterfly valve applications, the disc rests securely on the seat to close and seal the valve. Seats are designed to keep the seal intact despite the thermal, friction, and impact stresses of a process.

Selecting a Valve Seat Type
We have different types of butterfly valve for various applications. The type of butterfly valve seal used depends on the application conditions: temperature, pressure, and type of media. For more information on what pressure and temperature a valve can tolerate, refer to the specs published by the manufacturer.

BUNA - N (B)
This material is used in some automotive applications. However, BUNA - N is not suitable for applications that involve ketones, chlorinated hydrocarbons, nitro hydrocarbons, or ozone.

EPDM (E)
EPDM is widely used in HVAC systems. However, EPDM is not suitable for applications that involve lines with compressed air containing petroleum-based oils, hydrocarbon solvents or oils, chlorinated hydrocarbons, turpentine, etc.

PTFE (P)
PTFE is a cost-effective material in applications such as chemical processing or oil and gas. Because of its insulation quality, it is compatible with electrical applications. However, it should not be used in high-pressure conditions. PTFE temperature rating ranges from -50°F to 400°F.

VITON (V)

VITON is resistant to mineral acids and hydrocarbon products that are either concentrated or diluted. VITON temperature rating ranges from -20°F to 300°F.


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