Delta-Elektrogas R - RF Regulators

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.




In 1961 Elettromeccanica DELTA s.p.a. was founded in Arcade (TV) with the aim of designing and manufacturing oil burners with mechanical atomization. Today, Elettromeccanica DELTA and its brand Deltapumps and Elektrogas are leading manufacturers of gear oil pumps and safety control valves, exported in more than 60 countries in the world.


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.


The regulators are made of aluminum alloy die-cast.
They are equipped with adjustable spring, so that outlet pressure can be precisely adjusted on
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.


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.

This device is normally installed in gas trains, industrial applications and gas firing systems.
Figure 2 shows an example of installation with other Elektrogas devices.

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      R or RF models
pressure            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        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                Aluminum alloy, Brass, Stainless steel, Plated steel, Polyamide, Anaerobic adhesive
contact with gas        Nitrile rubber (NBR), Fluoro elastomer (FPM), Polytetrafluoroethylene (PTFE)
Specifications of        Free of brass
J version                     Seals made of Fluoroelastomer (FPM) instead of NBR
for biogas                   Ambient temperature -10/+60°
or COG                      Max gas inlet pressure 200mbar (Max outlet pressure 160 mbar)


Model                   R..1 R..2      R..35      R..4        R..7
R..3                      R..6        R..8
Spring                                                                       R..9
Green        …A..      5-13        9-16          5-13          9-18          5-13
Red            …B..      7-20       13-26        7-20          15-30       7-20
Neutral     …C..      10-30      20-40      10-30        25-60       10-30
Yellow       …D..     25-70     30-60        25-70       50-120      25-70
Violet         …E..    60-150    50-100       60-150     100-250   60-150
Orange      …F..        –          80 – 160     140-300         –          140 -300
Blue            …G..      –           125-250           –                 –                  –

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