What component typically determines how a gate valve is used?

The wedge shape of the gate is fundamental in determining how a gate valve operates. This design feature is crucial because it influences the valve’s ability to provide a tight seal when closed. A gate valve consists of a gate, which is typically shaped like a wedge, that moves perpendicular to the flow of fluid. When the valve is fully open, the wedge is retracted, allowing smooth flow with minimal obstruction. When closed, the wedge compresses against the valve body, creating a seal that minimizes leakage.

The valve's performance under different conditions, such as pressure and temperature, relies on the proper functioning of the wedge. Therefore, the wedge shape plays a critical role in applications where a full flow path is needed, minimizing resistance and pressure drop across the valve when open. This characteristic makes it suitable for applications involving on/off flow control rather than throttling service.

While the size of the valve, pressure rating, and temperature of the fluid are important considerations in selecting a gate valve, they primarily address the operational limits and suitability for specific applications rather than how the valve functions fundamentally. The wedge shape directly impacts the mechanism and sealing ability of the gate valve, making it the key determinant in its use.