The working pressure switches are used for the control of two-stage burners matched to steam generators.

The pressure switches are equipped with appropriate adjustable scale for the required application and with a single-pole change over swich where the contact position depends on the pressure in the connection port and the set value.

The burner will work in first stage at maximum power (second flame) until the setting pressure on first working pressure switch, will work instead in second stage at reduced power (first flame) in the pressure range between the two working pressure switches.

The second working pressure switch must be set at lower pressure than the safety pressure switch to avoid conflicts during operation.