Pressure regulator

 The pressure regulators FG/FGB are designed to reduce natural gas and lp gas pressure for civil, industrial and commercial applications in secondary pressure reducing station of gas network and all installation with rapid flow rate variation is required (burners, industrial ovens, boilers, etc..). They are suitable for low, medium and high pressure.
• Low/medium/high pressure versions
• High regulation accuracy
• High flow rate
• Spring loaded
• Fully bilance valve design
• Integral strength
• EN 334 / EN 14382 compliance
• Threaded and fl anged connections DN 25X25
• Compact design
• Easy maintenance
• SSV (UPSO/OPSO) safety device (option)
• Relief valve

INFORMATION TO BE SPECIFIED WHEN ORDERING:
Regulator type (BP-MP-TR)
• Minimum and maximum inlet pressures
• Outlet pressure range
• Connection type
• Options
- OPSO setting*
- UPSO setting*
* (if requested)

PRODUCT INFORMATION
The FG series pressure regulators are direct acting spring loaded regulator type, controlled by a diaphragm and counter spring. The balanced valve design ensures constant pressure setting when upstream pressure varies. Designed to deliver high regulation accuracy, these devices are suitable for use with non-corrosive gases, previously fi ltered.
The FG series pressure regulators are “top entry” design, which allows an easy maintenance without removing the body from the pipeline.
The FGB version is with incorporated safety shut off device (SSV or Upso-Opso) against over and under outlet pressure.
The regulator is CE marked and approved by Bureau Veritas under the Pressure Equipment Directive 97/23/EC (PED) according with EN 334 / EN 14382.

SAFETY SHUT-OFF VALVE (SSV) UPSO-OPSO
Product information: the FGB series pressure regulators are direct acting spring loaded regulator type, controlled by a diaphragm and counter spring. The balanced valve design ensures constant pressure setting when upstream pressure varies. Designed to deliver high regulation accuracy, these devices are suitable for use with non-corrosive gases, previously fi ltered. The regulator is CE marked and approved by Bureau Veritas under the Pressure Equipment Directive 97/23/EC (PED) according with EN 334 / EN 14382.

For calculate the fl ow at various conditions of installation you can use the formulas given in EN334: 2009 (simplifi ed calculations):
a) If the fl ow’s behavior is sub-critical, that if:

b) If the flow’s behavior is critical, that is if:

Where:
Q = is volumetric fl ow rate of the gas that pass through the regulator in the unit of time, expressed in Nm3/h;
d = is the relative density of the fluid into account (for air = 1 is value);
pu= is the gas pressure at the inlet of regulator, in bar (relative value);
tu = is the gas temperature at the inlet of regulator under test, in °C;
pd= is the gas pressure at the outlet of regulator, in bar (relative value);
db = is the ambient atmospheric pressure, in bar (absolute value);
Wide-open Flow Coefficient CG: 170