Installation and Operation Manual
Argos - Pressure Regulating Valve
MI-23
Elaborado
Verificado / Aprovado
CSQ
Data
Revisão
Página
JJ
VBL
JM
13/02/19
07
10 de 32
3.0 - OPERATION 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.
