Pressure regulators are used to maintain a constant outlet pressure or flow

Gas pressure regulators reduce the pressure of a gas, as it passes through a cylinder or process line, to another piece of equipment.

Pressure relief valves are self-actuated safety valves designed to relieve excess pressure upstream from the line

Air pressure regulators control pressure in air lines (usually adjustable) to remove fluctuations and maintain consistent pressure for pneumatic devices

Control valves or proportional valves are power-operated devices used to modify fluid flow or pressure rate in a process system

Hydraulic valves contain and transfer the flow and pressure of hydraulic fluid in hydraulic power systems.

Sanitary valves are designed for applications requiring clean or sterile processing.