Gate valves are mainly used for which application?

Gate valves are primarily used for on/off control in various fluid systems, including refrigeration systems. Their design allows for minimal flow restriction when fully open, ensuring that they are effective at starting or stopping the flow of refrigerants or other fluids. Unlike valves used for flow modulation, gate valves are not intended to regulate flow rates; instead, they serve the purpose of either allowing the flow to pass through or completely blocking it.

In the context of refrigeration, these valves are critical for isolating sections of the system during maintenance or repair work. They are typically operated manually, providing a straightforward mechanism for controlling the fluid path. Their construction, which often includes a wedge-shaped gate that slides up and down, facilitates this clear on/off functionality without the turbulence associated with other types of valves.

Other options refer to functions that do not align with the primary use of gate valves. For instance, flow modulation would involve continuously adjusting the flow level, which is better suited for globe or control valves. Automatic pressure maintenance and pneumatic operations involve specific technologies or mechanisms that differ significantly from the straightforward design and application of gate valves.