Which part of the valve is responsible for seating?

The face of the valve is critical for seating because it is the surface that comes into direct contact with the corresponding seat in the valve body. When the valve is closed, the face ensures a tight seal by pressing against the valve seat, preventing the flow of fluid or gas through the valve. This contact is essential for maintaining pressure and ensuring that the system operates efficiently without leaks.

While the stem, head, and margin play important roles in the overall function of the valve, they are not directly involved in the seating process. The stem is responsible for transmitting the motion to open or close the valve, while the head provides the structural integrity and support for the entire valve assembly. The margin refers to the edge of the valve face and can influence the sealing capability, but it is not the area of primary contact where seating occurs. Therefore, the face is specifically designed to engage with the seat and is crucial for effective sealing when the valve is closed.