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Delta-Elektrogas RAG Gas Ratio Regulators

Delta-Elektrogas RAG Gas Ratio Regulators: 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 bypass adjustable on-site and can be used as a zero-pressure regulator.

Delta-Elektrogas RAG Gas Ratio Regulators: 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 bypass adjustable on-site and can be used as a zero-pressure regulator.

The RAG-type products are pressure regulators for gaseous media, suitable for all types of gas-consuming appliances. RAG is air/gas ratio control (1:1) for combustion processes. It is provided with an adjustable offset spring (+/-3mbar) and adjustable bypass. It is also usable as a zero-pressure governor. All models are equipped with compensation diaphragm to assure high accuracy and are designed to perform lock-up functions.

Elettromeccanica DELTA, with its brands Elektrogas and Deltapumps, is a proud manufacturer of safety and control products for gas firing systems and fuel oil appliances, successfully installed in more than 60 countries in the world.

 

Features

  • The regulators are made of aluminum alloy die-cast, with a range for inlet/outlet connections
    from 3/4” 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.
  • 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).
  • 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 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.

Applications

A ratio regulator is a device able to maintain a gas outlet pressure equal to the air control pressure. Outlet gas and control air pressure act on the two sides of the same diaphragm, hence the disc moves until outlet pressure is the same as air pressure. If outlet pressure is needed to be a bit lower or higher than air, the spring must be adjusted. If a gas flow is required to be present when air control pressure is near zero, the bypass must be set. Variation of inlet pressure does not affect outlet pressure because the disc is compensated with a specific diaphragm.

Specifications

Connections Gas 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
P1 Differential pressure between the inlet and outlet pressure less than 100 mbar is advisable.
Air control pressure 0.5-120 mbar
P3 Gas inlet pressure has to be always higher than air control pressure
Gas Outlet pressure Air control pressure +/- 3 mbar (adjustable offset)
P2
Accuracy ±1mbar or ±15% of air control pressure (plus offset)
Max testing pressure M Max 750 mbar at inlet chamber – max 200 mbar at air control chamber
Flow capacity See Datasheet
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)
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