Installation and Operation Manual
Urano - Pressure Regulating Valve
MI-31
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JJ
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05/07/21
05
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6.11 PROCEDURE FOR THE G-44 BOOSTER (PRE-REGULATOR) ASSEMBLY
To perform the assembly of the G-44 booster, just follow the steps of the disassembly procedure in
inverse order starting with the seat assembly, but we shall make some observations on specific points that
must be examined closely during the booster reassembly:
3) The booster model G-44 is only used in assemblies of the Urano SO (FO) and has a distinctive main
valve connection scheme. For this reason, it is necessary to use an internal relief device to prevent rupture
of both diaphragms, of the booster and of the main operating valve, due to the high differential pressure.
This internal relief is adjusted by the spring (pos 4) compression during assembly of the diaphragm set onto
the shaft (pos 34), therefore, during assembly it is important to pay attention to this spring adjustment.
GASCAT recommends a distance of 14.4 to 14.5 mm from the lower diaphragm plate (pos 43), but if the
operator does not have means to carry out this measurement in the field, we recommend a visual
adjustment to be made so that only half of the shaft holes (pos 34 ) remain visible when pressing the
diaphragm assembly, as shown in the image below:
4) After assembly of all internals of the booster, when the same is to be shut by installing the cover and
screws (pos 12), we recommend that during the screws’ tightening the diaphragm assembly shall be
pushed with an Allen key through the cover upper outlet (pos 8) so that the diaphragm can be
properly fixed between the cover and the booster body.