What type of quick acting valve provides low flowing resistance and can be throttled?

The butterfly valve is known for its ability to provide low flowing resistance while also being easily adjustable, allowing for throttling. This type of valve features a disc that rotates in the flow path. When the disc is aligned with the flow, it offers minimal resistance, which is advantageous in applications requiring efficient fluid flow.

Additionally, the construction enables precise modulation of flow rates. By adjusting the angle of the disc, operators can effectively control the volume of fluid passing through the valve. This makes butterfly valves highly suitable for applications where quick operation and flow control are paramount, such as in HVAC systems or large-scale water systems.

In contrast, other valve types may not match the butterfly valve's combination of low flow resistance and throttling capability. For instance, gate valves are generally designed for either fully open or fully closed positions and are not intended for throttling. Similarly, while both plug and ball valves can provide efficient flow control, they typically offer higher flow resistance compared to butterfly valves when partially opened.