Delta Elektrogas RAG Gas Pressure Regulators

RAG Gas pressure regulators with filter and safety shut- off valve

The RAG type regulator has the scope of maintaining a constant air-gas ratio upstream of gas burners on installation without preheated air. It is equipped with a by-pass adjustable on-site and can be used as a zero-pressure regulator.


  • The regulators are made of aluminum alloy die-cast, with a range for inlet/outlet connections from 1/2” up to 2”.
  • Gas inlet pressure up to 500 mbar, air control pressure up to 120 mbar.
  • They are equipped with an adjustable spring and a counter spring, so that gas outlet pressure is equal to air control pressure, with a ratio 1:1 and an adjustable offset of +/-3mbar. The offset is useful to set gas flow at low fire.
  • RAG regulators have been designed for a flow regulation range equal to 10:1 and to generate low-pressure drop.
  • The disc is equipped with a gasket, so RAG is able to regulate precisely very low flow.
  • Every model is equipped with a bypass adjustable on-site. Bypass is useful in low fire state when very low flow is necessary or air control pressure is lower 0.5mbar.
  • The controls are equipped with an inlet pressure compensation diaphragm for precise regulation.
  • A metallic mesh filter protects the regulator seat from dirt contamination (filtration grade <1mm).
  • The impulse line is integrated inside the regulator. Special versions with external impulse lines are available on request.
  • Pipe connections meet group 2.
  • Suitable for use with non-aggressive gases included in the 1, 2 and 3 families (EN 437).
  • Special versions for aggressive gases (e.g. biogas).
  • Provided with pressure test points in the gas inlet, gas outlet, and air control chamber to connect manometers, pressure switches or other equipment.
  • RAG can be used as zero-pressure regulator. In this case, it is necessary to connect the vent port to a discharge pipe or to install the conversion kit
  • All components are designed to withstand any mechanical, chemical and thermal conditions occurring during typical service. Effective impregnation and surface treatments have been used to improve mechanical sturdiness, sealing, and resistance to corrosion of the components.
  • Regulators are 100% tested and fully warranted.

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ConnectionsGas threaded f/f ISO 7-1 from Rp1/2 to Rp2
Ambient temperature-15°C ... +60°C
Gas Inlet pressure
Max 500 mbar (50 kPa) or P out + 2.5 mbar for gas
Differential pressure between inlet and and outlet pressure less than 100 mbar is advisable.
Air control pressure
0.5-120 mbar
Gas inlet pressure has to be always higher than air control pressure
Gas Outlet pressure
Air control pressure +/- 3 mbar (adjustable offset)
Accuracy±1mbar or ±15% of air control pressure (plus offset)
Max testing pressure MMax 750 mbar at inlet chamber – max 200 mbar at air control chamber
Flow capacitySee Datasheet
Bypass flow can be set from 0 to max flow (fig.7)
Filtration gradewith metallic filter <1mm
InstallationHorizontal (with adjustable spring downwards) or vertical pipeline.
Gas type
Natural gas, town gas, LPG (gaseous) of families 1,2,3 (EN437).
On request special version for biologically produced methane without non-ferrous material and special seals.
Materials in contact with gasAluminum alloy, Brass, Stainless steel, plated steel, Polyamide, Anaerobic adhesive, Nitrile rubber (NBR), Fluoroelastomer (FPM), Polytetrafluoroethylene (PTFE)

Download Datasheet: Delta Elektrogas RAG Air and Gas Regulator

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