1 … 6

Pressure regulatorFRS

4.10

Technical descriptionThe DUNGS pressure regulator, type FRS, has an adjustable setpoint spring. The pressure regulator complies with EN 88 and DIN 3380:- Input pressures up to 500 mbar- High flow rate- Sturdy, precise and sensitive regula-

tion of regulator output pressure- Inlet pressure compensation dia-

phragms- Safety diaphragms- Internal pulse for regulator output

pressure as standard, optional ex-ternal pulse connection optional on both sides

- Rp 3/8 to Rp 2 thread connection- DN 40 to DN 150 flange connection

Prin

ted

in G

erm

any

• R

ösle

r D

ruck

• E

ditio

n 02

.06

• N

r. 21

4 74

3

ApplicationGas pressure regulator for gas burners and gas equipment. It does not contain any non-ferrous metals, suitable for gases of up to max. 0.1 vol.% H2S, dry. Suitable for gases of families 1, 2, 3 and other neutral gaseous media.

ApprovalEC type test approval as per EC Gas Appliance Directive:FRS … CE-0085 AQ7126Approvals in other important gas con-suming countries.

2 … 6

Specifications

Nominal diametersPipe thread as per ISO 7/1Flange

Max. operating pressure

Pressure regulator

Input pressure range

Output pressure range

Materials of gas-conveying parts

Ambient temperature

Installation position

Measuring/ignition gas connections

Pulse connection

Blow-off line

DN 40 50 65 80 100 125 150Rp 3/8 1/2 3/4 1 1 1/2 2 2 1/2 Connection flange as per DIN 2501 Part 1, to fit preweld flanges as per DIN 2633 (PN 16) DN 40 to DN 150, ISO 7005-2 (PN 16)

up to 500 mbar (50 kPa)

Pressure regulator as per EN 88, Class A, Group 2, DIN 3380, RG 10

+ 5 mbar or p2 +2.5 mbar up to 500 mbar

2.5 mbar to 200 mbar as a factor of adjustable setpoint spring

Housing: aluminium, steelSeals and diaphragms: NBR

-15 °C to + 70 °C

Regulator dome from vertically upright to lying horizontally

G 1/4 ISO 228 on both sides in inlet section

Internal in outlet section,Optional: external on housing on both sides

Blow-off line only required in special cases. Safety diaphragms are installed.Connection: G 1/4 ISO 228 to Rp 1; from Rp 1 1/2, DN 40: G 1/2 ISO 228

Pressure taps

1 Breathing plug, blow-off line.

2 Connection for external pulse G 1/4 ISO 228 screw plug on both sides, optional

3 G 1/4 ISO 228 screw plug in input section on both sides

FRS Spring-loaded pressure regulator with adjustable setpoint spring. Internal tap of regulator output pressure. External pulse connections optional, suitable for controlling regulator output pressure.

2

1

3

3 … 6

Spring selectionThe output pressure is provided by the force of the installed adjustable spring and the force due to weight of the

100…150Spring 8pink

229 825229 840229 849229 872229 881229 890229 899229 908229 916

60…110Spring 7black

229 824229 839229 848229 871229 880229 889229 898229 907229 915

5…20Spring 3orange

229 820229 835229 844229 853229 876229 885229 894229 903229 911

5…13Spring 2white

229 818229 834229 843229 852229 875229 884229 893229 902229 910

2,5…9Spring 1brown

229 817229 833229 842229 851229 874229 883229 892229 901229 909

30…70Spring 6yellow

229 823229 838229 847229 870229 879229 888229 897229 906229 914

Setpoint spring range [mbar]Spring colourNominal width Rp/DNRp 3/8, Rp 1/2Rp 3/4Rp 1Rp 1 1/2, DN 40Rp 2, DN 50Rp 2 1/2, DN 65, 80DN 100DN 125DN 150

Dimensions

moving parts. The pressure regulator is equipped with the blue spring No. 4 as standard. By exchanging the adjustable

spring, other output pressures can be adjusted.

10…30Spring 4blue Standard229 821229 836229 845229 854229 877229 886229 895229 904229 912

25…55Spring 5red

229 822229 837229 846229 869229 878229 887229 896229 905229 913

Order No.Internal pulse

086 462070 383070 391070 409058 446058 628083 303065 144065 151058 792079 681082 552013 250013 268

pmax. [mbar]

500500500500500500500500500500500500500500

b

115115130145195250285195250285285350400480

c

2424283340476065759595105135160

d

143143165190250310365280340405405495635780

e

G 1/4G 1/4G 1/4G 1/4G 1/2G 1/2G 1/2G 1/2G 1/2G 1/2G 1/2G 1/2G 1/2G 1/2

f

G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4

h

22522524531036545055039548059059076010001180

Rp / DN

Rp 3/8Rp 1/2Rp 3/4Rp 1Rp 1 1/2Rp 2Rp 2 1/2DN 40DN 50DN 65DN 80DN 100DN 125DN 150

a

7575100110150170230200230290310350400480

g

G 1/8G 1/8G 1/8G 1/8G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4G 1/4

Dimensions [mm] Weight [kg]

0.600.601.001.202.503.506.003.505.007.50

10.0016.0028.0038.00

Order No.External pulse

220 998211 817220 999210 381221 000208 237

214 474183 600183 930183 940211 019208 301208 302

Type

FRS 503FRS 505FRS 507FRS 510FRS 515FRS 520FRS 525FRS 5040FRS 5050FRS 5065FRS 5080FRS 5100FRS 5125FRS 5150

a

f

b

e

g

a

f

b

e

g

h

d

DN

c

h

d

DN

c

140…200Spring 9grey

229 826229 841229 850229 873229 882229 891229 900243 416243 417

4 … 6

Functional descriptionFunctions according to the force compari-son principle between the force of:- the adjustable setpoint spring- the differential pressure at the work-

ing diaphragm- the force due to weight of the moving

partsThe adjustable spring acts with the force due to weight of the moving parts. The output pressure is adjusted depending on the pretension of the adjustable spring and the installation position.

Do not route condensate from lines into the pres-

sure regulator.Protect the pressure regulator from fouling by means of a suit-able dirt trap.

Do not apply combustion gas or combustion gas

air mixtures to the installation chamber of the adjustable spring. Pressure regulators for this ap-plication on request only.

InstructionsGas-conveying lines, pulse and con-nection lines must be made of steel and at least PN 1, DN 6. The lines must be resistant to thermal, chemical and mechanical loads. The lines must be durable and resistant to deformation and cracks.

FRS 515 sectional drawingPressure regulator in operating position

1 Housing2 Regulating cup3 Pulse tap, internal

4 Compensation diaphragm5 Diaphragm disk6 Working diaphragm

8

7

5

4

3

2

1

6

10

9

p2p1

7 Safety diaphragm8 Breathing plug9 Setpoint spring10 Adjustment device

5 … 6

GasartType of gasType de gazTipo di gas

Erdgas/Nat.Gas/Gaz naturel/Gas metano

Stadtgas/City gas/Gaz de ville/Gas città

Flüssiggas/LPG/Gaz liquide/Gas liquido

Luft/Air/Air/Aria

dv

0.65

0.47

1.67

1.00

f

1.24

1.46

0.77

1.00

Dichte LuftAir densityDensité de l'airDensità dell'aria

spez. Gweicht des verwendeten GasesSpec. weight of gas usedpoids spécifique du gaz utilisépeso specifico del gas utilizzato

f =

Vverwendetes Gas/gas used/ gaz utilisé/gas utilizzato = V Luft/air/air/aria x f ° DichteDensityDensitéDensità[kg/m3]

0.81

0.58

2.08

1.24

Equipment preselection, blocked pressure regulatorsYou can preselect the nominal diam-eter using the volumetric flow pressure drop characteristic of the pressure regu-lators in mechanically open state. The pressure drop between input pressure

p1 and regulator output pressure p2 in connection with the maximum volumetric flow Vmax determine the nominal width of the pressure regulator. The operating point described by ∆pmin and Vmax is left of the nominal width of the pressure regulator to be selected.

The pressure drop over blocked pres-sure regulators is described by the "mechanically open" characteristic.The final determination is performed according to the dimension specified by the gas appliance manufacturer.

Volumetric flow pressure drop characteristicmechanically open

°

1

2

3

45

6789

10

20

30

4050

100

60708090

1 2 4 6 8 10 20 40 60 80 100 200 400 600 800 1000 2000 4000

1 2 4 6 8 10 20 40 60 80 100 200 400 600 800 1000 2000 4000

Vn [m /h] Luft / Air / Aria dv = 1,00° 3

Vn [m /h] Erdgas/Natural gas/Gaz Naturel/Gas metano dv = 0,65° 3

∆p [m

bar]

Basis + 15° C, 1013 mbar, trockenBased on + 15° C, 1013 mbar, dryBase + 15° C, 1013 mbar, secBase + 15° C, 1013 mbar, secco

Rp

3/8

Rp

1/2

Rp

3/4

Rp

1

DN

80

DN

100

DN

125

Rp

11/2

DN

40

DN

50

Rp

2

Rp

21/2

DN

65

DN

150

6 … 6

We reserve the right to make any changes in the interest of technical progress.

Flow diagram in regulated state, where p2 = 20 mbarVmin = 0,05 x Vmax

Pressure regulatorFRS

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Head Offices and FactoryKarl Dungs GmbH & Co. KG Siemensstraße 6-10 D-73660 Urbach, GermanyTelephone +49 (0)7181-804-0Fax +49 (0)7181-804-166

Postal addressKarl Dungs GmbH & Co. KGPostfach 12 29D-73602 Schorndorf, Germanye-mail info@dungs.comInternet www.dungs.com