Installation Manual, Maintenance and Operation
Pressure Regulating Valve – Model Horus
MI-18
Elaborate
Verified / Approved
CSQ
Date
Review
Page
J.Junior
Celso Nieto
JM
25/11/16 04
9 de 32
3.2 BOOSTER (G-43)
The Booster is nothing more than a pre-regulator that automatically adjusts the process conditions as a function of the
input pressure and output pressure with the purpose of reducing the pilot inlet pressure, allowing the pilot to operate in a
milder condition, thus eliminating any chance of interference on the regulator piloting by the input pressure variation.
The use of a pre-regulator, or booster, is recommended only for applications where the pressure differential exceeds
10.0 bar.
Booster models G-43 and G-44 are designed to keep the pilot input pressure set 1 to 2 bar above the desired set point,
e.g.: if we are adjusting the pressure regulator to 20 bar, the booster will be applying to the pilot a pressure of 21 to 22 bar.
Typically, the booster G-43 have three connections to the process. These are represented by the red line in the figure
above, from the regulator inlet and loaded with the inlet pressure; the yellow line is the output pressure of the main
regulator, also called sensor pick-up, and is responsible for actuating on the booster diaphragm (A), moving the shaft (B)
away from the gasket (C), thus allowing the passage of gas from the regulator input at a pressure 1 to 2 Kgf/cm² above the
set point pressure of the main regulator, which by its turn is represented by the green color and is the pick-up that will
follow to the Pilot.
Attention: In some assemblies, the booster can be integrated into the pilot; this change is merely ergonomic to reduce
space, component count and ease of operation. However, it is important to note that the operating principle is exactly the
same as given above.
A
B
C
