WATTS FG1B Series Gas Pressure Governor Installation Guide

Series FGD, FGDR, FG1B

Gas pressure governor

Installation manual

Installation and Operation Manual

WattsWater.eu

Certifications

In compliance with Regulation (EU) 2016/426

In compliance with 2014/34/EU Directive “Atex”

In compliance with Technical Regulations of the Eurasian Customs Union (EAC)

OVERALL DIMENSIONS (mm)

FGDR 50/40 – FG1B50/40: model with 2″ connection but overall dimension as 1″1/4 and 1″1/2 models.

GAS PRESSURE GOVERNOR

Technical Details

Inlet pressure range P 1:
FGD: P2 + 5 mbar up to 200mbar.
FGDR: P2 + 30 mbar up to 500mbar.
FG1B: P2 + 30 mbar up to 1bar.
Operating range P 2 : neutral spring standard supply; 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); liquefied petroleum gas (lpg); non-aggressive gas.
Ambient temperature range: -15°C ÷ +60°C.
Resistance: according to EN13611 specifications.
Operation: by tensioning the spring, without auxiliary energy.
Construction features: compensation of inlet pressure, standard-supply safety diaphragm, internal 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 standards. 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 dm³/h) is possible inside the room (in compliance with par. 6.2.3. EN13611 standard).

Setting

The outlet pressure can be set by means of the setscrew (2); by turning clockwise this set-screw the pressure is increased and by turning it anti- clockwise 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 diaphragm 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 suitable 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

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 atwww.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.

under the bottom cover so it can be disassembled. At every cleaning replace the gasket (8) of the filter cover as well. After completing this operation check that there are no gas leakages through the cover itself. Use only manufacturer specified and supplied spare parts (e.g. filter, spring etc.). If other parts are used, the product may not operate properly. In this case, the manufacturer is not liable for any malfunctions.

ALL INSTALLATION AND MAINTENANCE
OPERATIONS MUST BE CARRIED OUT SOLELY
BY QUALIFIED PERSONNEL.

Rp 1/2”÷2″ THREADED MODELS WITH INCORPORATED FILTER

1 – Upper cap
2 – Set-screw
3 – Drain plug
4 – Bleed screw
5 – Safety diaphragm
6 – Compensation diaphragm
7 – Filter
8 – Cover gasket
9 – Filter cover
10 – Sealing gasket
11 – Pressure pipe
12 – Operating diaphragm
13 – Spring
14 – Spring washer

SPRINGS SETTING RANGE: P2 (mbar)

Model| FGD
15 – 20 – 25| FGD
32 – 40| FGD
50
---|---|---|---
Springs color| GREEN| 5 – 15| 5 – 15| 5 – 15
NEUTRAL| 10 – 30| 10 – 25| 10 – 35
VIOLET| 25 – 80| 20 – 70| 30 – 80
BROWN| 70 – 160| 65 – 130| 70 – 160
WHITE| /| 120 – 160| /

Model| FGDR
15 – 20 – 25| FGDR
32 – 40 – 50/40|

FGDR
50

---|---|---|---
Springs color| GREEN| 5 – 15| 5 – 15| 5 – 15
NEUTRAL| 10 – 30| 10 – 25| 10 – 35
VIOLET| 25 – 80| 20 – 70| 30 – 80
BROWN| 70 – 160| 65 – 130| 70 – 160
BLUE| 150 – 280| /| 210-350
WHITE| 270 – 350| 120 – 250| /
BLACK| /| 240 – 350| /

Model| FG1B
15 – 20 – 25| FG1B
32 – 40 – 50/40|

FG1B
50

---|---|---|---
Springs color| NEUTRAL| 10 – 30| 10 – 25| 10 – 35
VIOLET| 25 – 80| 20 – 70| 30 – 80
BROWN| 70 – 160| 65 – 130| 70 – 160
BLUE| 150 – 280| /| 210 – 450
WHITE| 270 – 450| 120 – 250| /
BLACK| /| 240 – 360| /
ORANGE| /| 350 – 450| /

To put out of service replace the spring with the suitable spacer.

CAPACITY / PRESSURE LOSS DIAGRAM WITH THE GOVERNOR OUT OF SERVICE

The meaning of “ governor out of service” it is intended that the governor is out of the normal operation; to get this status it is inserted one spacer to replace the spring and so the governor’s shutter is kept completely open.

This diagram is used to know the min. “ pressure loss ” (min. Δp) the governor must have to get one determined gas capacity; in practice, it is the pressure loss (detected from the diagram) caused by the gas flow through the body of the governor itself.

The “ pressure drop ” means the arithmetic difference between the (P1) inlet pressure and the (P2) outlet pressure which the governor is set to.

The governors operate even at low pressure drops efficaciously, anyway, to get a tolerance that can assure a good function, it is requested to have a pressure drop which corresponds to the double of the pressure drop resulting from the diagram at least.

PRESSURE LOSS

Capacity

Q (Nm3/h)

Density

1 dv: 0,62 – Natural gas
2 dv: 1 – Air
3 dv: 1,56 – L.P.G
4 dv: 0,45 – Town gas

With reference to EN 88 standards

Guarantee

Watts products are thoroughly tested. The said guarantee covers solely replacement or – at the full sole discretion of WATTS – repair, free of charge, of those components of the goods supplied which in the sole view of Watts present proven manufacturing defects. The period of limitation for claims based on defects and defects in title is two years from delivery/the passage of risk. This warranty excludes any damage due to normal product usage or friction and does not include any modified or unauthorized repair for which Watts will not accept any request for damage (either direct or indirect) compensation (for full details see our website). All sales subject to the Watts terms to be found on www.wattswater.eu

Watts Industries Italia S.r.l.
Sede operativa: Via Brenno, 21 – 20853 Biassono (MB), Italia – Tel:
+39 039 49.86.1 – Fax: +39 039 49.86.222

FGD-FGDR-FG1B-MOI-IT-W-ML-03-22-Rev1 K0127Z – Rev. B 03/2022          © 2022 Watts

References

• Gerhard Schuster - StB
• Home | Watts Europe
• Home | Watts Europe
• Watts Industries Italia S.r.l. | Watts Water Technologies.

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