Elektrogas - R & RF Series - Regulators for Gas

The R type is a regulator for gas pipelines according to EN 88. It can be equipped with an integrated filter (type RF) according to DIN3386. This device is suitable for supplying clean gas at stable pressure to all the devices downstream.

Elektrogas - R & RF Series - Regulators for Gas with Filter and Safety Diaphragm


- The regulators are made of aluminum alloy die-cast.
- They are equipped with adjustable spring, so that outlet pressure can be precisely adjusted on site.
- Regulators can also be equipped with a filter element with a very high holding capacity of dust and impurities (filtration grade<50μm).

-Filter structure consists in a steel support frame covered with a double-layer high-performance nonwoven made of polyolefin fibers. Thanks to that, moving parts of regulator and other devices downstream are fully protected.
- Regulators are equipped with working and safety diaphragms, hence it is not necessary to connect outside the vent line.

- The closing plate is balanced with a specific compensating diaphragm, resulting in a very stable outlet pressure.
- The impulse line is integrated inside the regulator. Special versions with external impulse line are available on request.

- Pipe connections meet group 2.
- R - RF regulators have been designed to generate low pressure drop with high flow.
- The governors have the ability to lock up when there is no flow.

- Suitable for use with air and non-aggressive gases included in the 1, 2 and 3 families (EN 437). Special versions for aggressive gases (Biogas, COG).
- Provided with pressure test points on two sides in the inlet (after the filter cartridge) and outlet chamber to connect manometers, pressure switches or other gas equipments.

- 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 components.

- Regulators are 100% tested and fully warranted.

Technical Specifications

- Connections: Gas threaded F/F ISO 7-1 from Rp1/2 to Rp2
or ANSI-ASME B1.20 from 3/4”NPT to 2”NPT
Flanged PN16 – ISO 7005 DN40 – DN100

- Ambient temperature:-15°C ... +60°C
- Inlet-Outlet pressure: R or RF models
Inlet pressure: Max 500mbar (50 KPa) or Pout + 5mbar

- Testing pressure: max 750 mbar – outlet 500mbar
- Regulating class: Class A - EN88 (±1mbar or ±15% of set value)
For Outlet pressure see Tab. 2
- Lock up pressure: SG30 for lock-up (+7.5mbar or +30% of set value)

- Flow capacity: see charts
- Filtration grade: RF (filtering cartridge): ≤50 μm
- Installation ½”-2”: horizontal (with settable spring upward) or vertical pipeline
2”½-3”-4”: only horizontal pipeline (with settable spring upward)

- Gas type: Air, natural gas, town gas, LPG (gaseous) of families 1,2,3 (EN437)
- Materials in contact with gas: Aluminum alloy, Brass, Stainless steel, Plated steel, Polyamide, Anaerobic adhesive Nitrile rubber (NBR), Fluoro elastomer (FPM), Polytetrafluoroethylene (PTFE)

- Specifications of J version for biogas or COG:
Free of brass
Seals made of Fluoroelastomer (FPM) instead of NBR
Ambient temperature -10/+60°
Max gas inlet pressure 200mbar (Max outlet pressure 160 mbar)

Product DATASHEET - R & RF Series - Regulators for Gas

Functioning and application

A regulator is a device able to maintain a stable pressure at the outlet, despite of changes of inlet pressure and/or gas flow rate. The outlet pressure pushes on the working diaphragm, acting against the spring. The disc moves until force of spring and outlet pressure are equal. If the flow decreases, e.g. because a downstream valve has been closed, a small increase in outlet pressure occurs, so the disc moves to reach a new position, balanced between outlet pressure and spring.

If higher outlet pressure is needed, the regulating screw must be tightened, increasing the force of spring. Variation of inlet pressure does not affect outlet pressure because the closing plate is compensated with the compensating diaphragm. If the flow stops, the outlet pressure increases just slightly, as the disc has a gasket and closes perfectly the passage.