Elektrogas - RAG - Air/Gas Ratio Regulators
The RAG type regulator has the scope of maintaining a constant air-gas ratio upstream of gasburners on installation without preheated air. It is equipped with a by-pass adjustable on site and can be used as 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 counterspring, 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.
> 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 a very low flow is necessary or air control pressure is lower 0.5mbar.
> The controls are equipped with inlet pressure compensation diaphragm for a 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 line 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).
> 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 equipments.
> 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 condition 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.
> Connections: Gas threaded f/f ISO 7-1 from Rp1/2 to Rp2
> Ambient temperature: -15°C ... +60°C
> Gas Inlet pressure P1: 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 P3: 0.5-120 mbar
Gas inlet pressure has to be always higher than air control pressure
> Gas Outlet pressure P2: Air control pressure +/- 3 mbar (adjustable offset)
> Accuracy: ±1mbar or ±15% of air control pressure (plus offset)
>Max testing pressure: Max 750 mbar at inlet chamber – max 200 mbar at air control chamber
> Flow capacity: See charts. Bypass flow can be set from 0 to max flow (fig.7)
> Filtration grade: with metallic filter <1mm
> Installation: Horizontal (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 gas: Aluminum alloy, Brass, Stainless steel, plated steel Polyamide, Anaerobic adhesive, Nitrile rubber (NBR), Fluoroelastomer (FPM), Polytetrafluoroethylene (PTFE)