Installation and Operation Manual
Argos WA - Pressure Regulating Valve
MI-44
Elaborado
Verificado / Aprovado
CSQ
Data
Revisão
Página
JJ
GN
JM
03/09/18
01
9 de 20
3 – OPERATING PRINCIPLE
3.1 – THE REGULATOR
The pressure regulator Argos works by principle of drop pressure in the upper chamber (diaphragm of main valve).
In the flow absence the pressure regulator stays close, because the pressure in the upper chamber of diaphragm (feed by
the pilot), added to the spring force is superior to the pressure that acts below the diaphragm (inlet pressure).
The pilot, in this condition of flow absence, stays closed, because the outlet pressure added to obturator spring of pilot is
superior to the regulating spring force, and moves the obturator set upward, against the pilot seat, closing the pilot gas
passage.
In case of flow, the pressure in the sensing line start decreasing, causing the pilot opening because of the regulating spring
of pilot added to the pressure under its diaphragm. In parallel, the discharge pressure also decreases. In this condition,
occur the reducing of the pressure in the upper chamber of diaphragm of main valve. Then, the inlet pressure become
superior to the spring force of main valve added to the pressure in the upper chamber of diaphragm of main valve, allowing
that the main valve opens, releasing the gas to the process.
3.2 – REGULATOR – ACTIVE / MONITOR SYSTEM
In the active / monitor system, the regulator working principle is similar then previously explained.
