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

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

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

Rupture discs and burst discs are designed to open and relieve overpressure, high temperature, or vacuum conditions at a predetermined differential pressure or specific temperature.

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

Ball valves provide tight shut-off and characterizable control.