GFH45/GFH75/GFH76 Airpak® Filter-Regulator
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CONOFLOW AIRPAK® FILTER REGULATORS GFH45/75/76 SERIES Conoflow’s GFH Series Airpak® Filter-Regulators are widely used to provide clean, regulated air pressure to instruments and controls, automatic machinery and other pneumatic devices. These ruggedly built units are available in either brass or stainless steel construction affording versatility in meeting today’s instrument and industrial applications. The brass model has a maximum pressure rating of 300 PSI (2068 kPa) (GFH45). The stainless steel versions are rated at 300 PSI (2068 kPa) and are available in two configurations. The GFH75 provided for corrosive environments has a 316 stainless steel exterior with brass/302-303 stainless steel internals. The GFH76 is manufactured to meet the requirements of NACE Specifications MR-01-75 (1980 Revision) Sulphide Stress Cracking Resistant Metallic Material for Oil Field Equipment making this unit ideally suited for applications where sour medium is present. Buna “N” elastomers are standard for the GFH45/75 Series. The GFH76 has viton elastomers. All units incorporate a 35 micron polypropylene filter. Cellulose (10 micron) and stainless steel (40 micron) filters are available. Consult the factory for details. Three regulated pressure ranges of 0-25, 0-60 and 0-125 (0-172, 0-414 and 0-862 kPa) are available with adjustments made by means of a wrench knob. Handwheel adjustment, preset and tamperproof versions are available. PRESSURE GAUGES 2” Diameter - Steel, Brass or Stainless Steel Case Ranges: 0-30, 0-60 and 0-160 PSI (0-207, 0-414 and 0-1103 kPa) MOUNTING Line - All Variations Wall - GFH45 (Standard) - (GFH75/76 Optional) Flush-back panel mounted (3 hole) (Optional) Each unit incorporates four 1/4” NPT connections. The additional porting allows installation of a gauge for monitoring output pressure. Brass, steel and stainless steel case gauges are available. ADJUSTMENT Knob - Standard Handwheel - Optional Preset - Factory output setting CAN be field adjusted Tamperproof - Factory output setting CANNOT be field adjusted These Airpaks® are designed for reliability with an absolute minimum of maintenance. The characteristics are a result of Conoflow’s high standards of manufacturing and years of experience as a leading producer of pneumatic instrumentation.

PRINCIPLES OF OPERATION venting the excess pressure to atmosphere until equilibrium is reached. If the output pressure drops below the set pressure, the unbalanced force from the range spring acts through the diaphragm assembly unseating the nozzle plug. This allows supply pressure to flow through the nozzle to the downstream port increasing the output pressure. The output pressure increases until it balances the force on the diaphragm assembly by the range spring. At equilibrium, the plug assumes a position which supplies the required flow while maintaining the output pressure at the set...

SPECIFICATIONS OPERATING CHARACTERISTICS Maximum Supply Pressure Connections Regulated Output Pressure Ranges Flow Capacity [100 PSI (690 kPa) Supply] - See Formula Sensitivity Supply Pressure Effect for 25 PSI (172 kPa) Change in Supply Pressure Ambient Temperature Range Filter Rating (See Note 1) Approximate Shipping Weight Body Bonnet Diaphragm Assembly Nozzle Range Spring Bowl and Draincock GFH45 (See Note 3) Brass Brass Buna “N” Brass w/Buna “N” Seat Steel Cadmium Plated Brass/Brass GFH75 316 Stainless Steel 316 Stainless Steel Buna “N” Brass w/Buna “N” Seat Steel Zinc Plated 316...

CONTROL ENGINEERING DATA Control Engineering Data is intended to provide a single source from which one can determine, in detail, the full scope of the product line. In addition to materials of construction, diaphragm selection and filtering capabilities, it also provides all necessary data, regarding adjustment options and range selections. Control Engineering Data also provides a means of communicating, by way of a code number, which is fully descriptive of the product selection. NOTE: 1. Catalog numbers as received must contain twelve (12) characters. GFH45 = Airpak® - Filter, Regulator...