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UK
GAS PRESSURE GOVERNOR
Technical Details
Inlet pressure range P
FGD: P
+ 5 mbar up to 200mbar.
2
FGDR: P
+ 30 mbar up to 500mbar.
2
FG1B: P
+ 30 mbar up to 1bar.
2
Operating range P
: neutral spring standard sup-
2
ply; other ranges according to the spring table.
Standard reference:
FGD – FGDR: EN 88-1.
FG1B: EN 88-2.
Governor class:
FGD – FGDR: class A.
FG1B: class AC10.
Closing pressure:
FGD: this model doesn't feature test closing.
FGDR: in according with Standard EN 88-1.
FG1B: SG + 12,5 mbar/ +30% of P2 value.
Governor group: 2.
Fuel: gases of three families: manufactured gas
(town gas); natural gas (group H - methane); lique-
fied petroleum gas (lpg); non-aggressive gas.
Ambient temperature range: -15°C ÷ +60°C.
Resistance: according to EN13611 specifications.
Operation: by tensioning the spring, without aux-
iliary energy.
Construction features: compensation of inlet
pressure, standard-supply safety diaphragm, inter-
nal pipe impulse. Fastseal gasket. All models are
supplied with inlet / outlet pipe tap fittings.
Material: aluminium body; inner parts in aluminium,
steel, brass and synthetic materials; diaphragm and
gaskets in nitrilebutadiene rubber.
General information
The gas pressure governors conform to Regulation
(EU) 2016/426, and to the respective EN 88 stan-
dards. The governors are suitable to installation
systems with automatic gas burners including
mixed and combined systems and to industrial
distribution systems.
Technical features
Compensation diaphragm, operating diaphragm
and safety diaphragm: an external breather outlet
pipe is not necessary as the incorporated safety
diaphragm ensures that, in the event of breakage of
the operating diaphragm, no gas leakage (over 70
The descriptions and photographs contained in this product specification sheet are supplied by way of information only
and are not binding. Watts Industries reserves the right to carry out any technical and design improvements to its products
without prior notice. Warranty: All sales and contracts for sale are expressly conditioned on the buyer's assent to Watts terms
and conditions found on its website at www.wattswater.eu. Watts hereby objects to any term, different from or additional to
Watts terms, contained in any buyer communication in any form, unless agreed to in a writing signed by an officer of Watts.
FGD-FGDR-FG1B-MOI-IT-W-ML-04-21-Rev0
:
1
dm
/h) is possible inside the room (in compliance
3
with par. 6.2.3. EN13611 standard).
Setting
The outlet pressure can be set by means of the set-
screw (2); by turning clockwise this set-screw the
pressure is increased and by turning it anti-clock-
wise the pressure is decrease. The pipe fittings
located upstream and downstream the governor
allow the reading of the relative pressures, passing
from one family of gas to another, choosing the
most suitable spring and adjusting the set-screw
(2). The stabilized pressure should be checked with
a pressure gauge. After setting, replace the upper
cap (1).
Installation
Is suggested to Install the governor with the dia-
phragm positioned horizontally (on horizontal pipes).
Be careful to follow always the direction of gas flow
indicated by the arrow on the governor. Suitable
tools must be used for the governor fitting on the
inlet and outlet hubs. Never effect leverage on the
sleeve of the upper cover when fitting the governor.
For all models with the filter inside, the governor is
best fitted at a comfortable height from the ground
so as to facilitate the filter cleaning (fit always a suit-
able gas filter upstream the governor). Make sure
that the pipes are clean and aligned so the governor
is not under stress. Do not remove the perforated
diaphragm breather cap (3) and do not obstruct the
hole, otherwise the governor will not work. Install
the governor so avoiding contact with plastered
walls. Make sure that the governor is suitable to
the intended use. When the governor is installed
outdoors, we recommend providing protection (e.g.
a canopy) to prevent damage to the product by the
elements (water, etc.).
Maintenance
The governors are completely maintenance-free.
In the event of a breakdown, a general overhaul
and factory testing is recommended. To clean the
filter, simply remove the cover (9) and replace the
filter cartridge (7). To facilitate this operation, we
recommend leaving a clearance of about 400 mm
K0127Z – Rev. A 04/2021
5
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