Depending on the application, certain requirements apply to the stability of the working pressure (outlet pressure) and thus what type of pressure regulator should be used. During gas withdrawal with regulators, the pressure in the gas cylinder drops. This pressure change has an influence on the force equilibrium in the cylinder pressure regulator. If no manual correction is made via the adjusting screw of the pressure regulator, the outlet pressure increases slightly during withdrawal. By means of a compensated main valve or exact technology, it is possible to counteract this often disturbing effect in single stage regulators.

The use of two stage regulators is recommended for high requirements on pressure stability as well as low outlet pressures. In such pressure regulators, a first stage reduces the inlet pressure to a preset intermediate pressure, for instance 20 bar. The required outlet pressure is set manually by a second stage. In this way, two stage regulators exhibit a practically stable outlet pressure. All regulators are equipped with relief valves to protect the connected equipment and two pressure gauges indicating the cylinder and outlet pressure.