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Gas pressure regulator RMG 408

Valve specifications

Pipe sizes	Valve seat diameter in mm	Flow rate coefficient K_G* in m³/(h · bar)	Face-to-face dimension in mm
DN 50/100	30 37 52	450 650 1150	450
DN 80/150	37 52 81	750 1400 2400	500
DN 100/200	52 81 102	1700 3400 3800	650

Pipe sizes

Valve seat diameter

in mm

Flow rate coefficient

K_G*

in m³/(h · bar)

Face-to-face
dimension

in mm

DN 50/100

450

650

1150

450

DN 80/150

750

1400

2400

500

DN 100/200

102

1700

3400

3800

650

*) Flow rate coefficient for natural gas: (ρ_b = 0.83 kg/m³, t =15 °C)

Specific outlet pressure range with pilot RMG 610 (RS 10d)

Load limiting stage	Control stage
Measuring unit	Wire Ø in mm	Specific outlet pressure range W_ds in bar	Measuring unit	Wire Ø in mm	Colour coding	Specific outlet pressure range W_ds in bar
M	3.3 (green)	0.1 to 1.5	N	2,5 3 3.5 4 5	white yellow green red blue	0.01 to 0.04 0.02 to 0.06 0.04 to 0.12 0.08 to 0.2 0.1 to 0.5
5 (silver)	0.5 to 5	M	3.3 4 4.7	green blue brown	0.3 to 1.5 1 to 2.5 2 to 3.5

Load limiting stage

Control stage

Measuring unit

Wire Ø
in mm

Specific outlet pressure range

W_ds in bar

Measuring unit

Wire Ø
in mm

Colour coding

Specific outlet pressure range

W_ds in bar

3.3

(green)

0.1 to 1.5

2,5

3.5

white

yellow

green

red

blue

0.01 to 0.04

0.02 to 0.06

0.04 to 0.12

0.08 to 0.2

0.1 to 0.5

(silver)

0.5 to 5

3.3

4.7

green

blue

brown

0.3 to 1.5

1 to 2.5

2 to 3.5

Specific outlet pressure range with pilot RMG 650

	Setpoint spring	Outlet pressure range W_ds
Spring no.	Wire Ø in mm	Colour coding
Control stage	2 3 4	4.5 5 6.3	black grey brown	1 to 5 bar 2 to 10 bar 5 to 15 bar
Automatic load-limiting stage		5	green	0.5 to 15 automatic: above p_d

Setpoint spring

Outlet pressure range

W_ds

Spring
no.

Wire Ø
in mm

Colour coding

Control stage

4.5

6.3

black

grey

brown

1 to 5 bar

2 to 10 bar

5 to 15 bar

Automatic load-limiting stage

green

0.5 to 15

automatic: above p_d

Accuracy Class and lock-up pressure Class

Outlet pressure range (p_drange )	Accuracy Class AC	Lock-up pressure Class SG
10 to 20 mbar > 20 to 30 mbar > 30 to 50 mbar > 50 to 100 mbar > 100 to 500 mbar > 0.5 to 2.5 bar > 2.5 to 5 bar > 5 bar	20 10 10 5*/10 5 2.5 1 1	50 30 20 10*/20 10 10 10 5

Outlet pressure range

(p_drange )

Accuracy Class

Lock-up pressure Class

10 to 20 mbar

> 20 to 30 mbar

> 30 to 50 mbar

> 50 to 100 mbar

> 100 to 500 mbar

> 0.5 to 2.5 bar

> 2.5 to 5 bar

> 5 bar

5*/10

2.5

10*/20

*) Better accuracy and lock-up pressure classes apply if inlet pressure variation < 8 bar.

Setting range of SSV control element

Actuator system	Overpressure W_do in bar	Underpressure W_du
K 4 K 5 K 6 K 10a K 16 K 17	0.04 to 0.5 0.2 to 1.5 0.6 to 4.5 0.05 to 1.5 0.8 to 16	5 to 60 mbar 15 to 120 mbar 40 to 300 mbar 10 to 120 mbar 2 to 16 bar

Actuator system

Overpressure

W_do in bar

Underpressure

W_du

K 4

K 5

K 6

K 10a

K 16

K 17

0.04 to 0.5

0.2 to 1.5

0.6 to 4.5

0.05 to 1.5

0.8 to 16

5 to 60 mbar

15 to 120 mbar

40 to 300 mbar

10 to 120 mbar

2 to 16 bar

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RMG 408

Tables valve data, outlet pressure ranges, accuracy class and setting range

Gas pressure regulator RMG 408

Valve specifications

Specific outlet pressure range with pilot RMG 610 (RS 10d)

Specific outlet pressure range with pilot RMG 650

Accuracy Class and lock-up pressure Class

Setting range of SSV control element

RMG 408

Technical description

Cut-away views

Operation & maintenance, spare parts