Installation and Operation Manual
Urano - Pressure Regulating Valve
MI-31
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Verificado / Aprovado
CSQ
Data
Revisão
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JJ
JJ
JM
05/07/21
05
14 de 74
3.4 PILOTS (G-40 & G-42)
The dual diaphragm pilot series G-40 and G-42 can achieve much higher regulation accuracies than other
pilots due to their construction characteristics.
Pilots are responsible for sending the exact loading pressure for pressure regulating valves to open or close
under normal process conditions by the balance between the regulation spring force and the outlet pressure
from the sensor pick-up.
The green line represents the pressure from the booster or pre-regulator, the yellow line is the regulator
output pressure (sensor pick-up) and is responsible for displacing the diaphragm assembly (A) up or down,
causing the pilot shutter (B) to leave the seat (C) thus allowing the inlet pressure reduction and sending the gas
at an appropriate pressure to load the main valve causing the valve to open or close according to the process
conditions.
3.5 FILTERS
The GASCAT pilot blocks, consisting of a pilot and pre-regulator always have a mechanical barrier against
solid impurities; this barrier comprises a polypropylene filter element of 10-micra filtration grade.
This barrier is intended to prevent that solid contaminants contained within the pipework can clog or damage
the internal parts of pre-regulator and of the pilot.
However, it is important to note that this filter does not
replace the filtration system that shall be provided in preliminary steps to pressure regulating to leave
the fluid clean and according to correct operating conditions.
This filter is designed to serve as the last
barrier to solid contaminants
.
A
B
C