Between the gate valve and globe valve, which one has the lowest pressure drop as fluid flows through the system?

The gate valve is designed for full flow and is primarily used in applications where minimal resistance to fluid flow is required. When the gate valve is fully opened, it presents a straight path for the fluid, resulting in low pressure drop across the valve. This characteristic makes it particularly suitable for on/off applications where flow needs to be controlled without significantly impacting the overall system pressure.

In contrast, globe valves, while effective for regulating flow, have a more complex internal design that creates turbulence and point of restriction, leading to higher pressure drops. Other valve types, such as butterfly and check valves, might also introduce varying degrees of pressure loss depending on their design and operational conditions.

Thus, among the options presented, the gate valve is the one with the lowest pressure drop as fluid flows through the system, making it an ideal choice for applications requiring minimal pressure loss when the valve is fully open.