Pressure controllers accept input from pressure sensors, transmitters, gauges, and other devices and subsequently control adjustment to the pressure to maintain or achieve the desired pressure level

Pressure instruments are used to measure, monitor, record, transmit or control pressure

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

Pressure sensors include all sensors, transducers and elements that produce an electrical signal proportional to pressure or changes in pressure

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

 Pressure vessels are storage tanks that are designed to operate at pressures above 15 psig

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