Siemens VGD4 series User manual

CC1U7643en

14.03.2018

Building Technologies

Operation Manual and Mounting Instructions for a

VGD4/VRD4 double gas valve with 2 SKPx5

actuators

Note!

The combination of a VGD4/VRD4 double gas valve with a QPLx5 pressure switch

and SKPx5 actuator does not require any maintenance.

Caution!

This document is intended for end users. All legal, safety, warning, and

technical notes contained in the data sheets for the SKPx5 actuator (N7643),

VGD4 double gas valve (N7631), VRD4 double gas valve for biogases and

recycling gases (N7649), and the QPLx5 pressure switch (N7221) are also

applicable!

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Building Technologies Operation Manual and Mounting Instructions VGD4 / VRD4 / SKPx5 CC1U7643en

14.03.2018

1 Use

The combination of the SKPx5 actuator and VGD4/VRD4 double gas valve takes on

the functions of a

∂Safety shutoff valve (SKP15)

∂Safety shutoff valve with specific pressure control (SKP25)

1.1 SKP15 actuator

The electrohydraulically operated SKP15 gas fittings together with VGD4/VRD4 work

exclusively as a safety shutoff valve (OPEN/CLOSED) and are used primarily on gas-

fired combustion plant. They open slowly and close rapidly. The SKP15 actuator can be

supplied with end switches including a valve stroke display or without an end switch or

valve stroke display.

1.2 SKP25 actuator

The electrohydraulically operated SKP25 gas fittings together with VGD4/VRD4 work

as a safety shutoff valve (OPEN/CLOSED) and are also used as a gas pressure

governor. This controls the gas pressure on the outlet side according to the setpoint

value established by means of a setpoint spring. The SKP25 actuator can be supplied

with or without an end switch.

The valve stroke display is generally provided.

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Building Technologies Operation Manual and Mounting Instructions VGD4 / VRD4 / SKPx5 CC1U7643en

14.03.2018

1.3 Application example

1 x VGD40/VRD40 + 1 x SKP15 and 1 x SKP25

7643z80en/0718

OPEN/CLOSED

ith valve stroke display

With end switch

SKP15.001

OPEN/CLOSED

SKP15.000

Without valve stroke display

Without end switch

SKP15.001 SKP25.003

OPEN/CLOSED

With valve stroke display

With end switch

OPEN

With v

Withou

With c

1 x VGD40/VRD40 + 2 x SKP15

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Building Technologies Operation Manual and Mounting Instructions VGD4 / VRD4 / SKPx5 CC1U7643en

14.03.2018

2 Description of the SKPx5 actuators

Operating mode display

Valve stroke display

The valve stroke display indicates the relative valve stroke. Depending on the tolerance

limits, the fully closed position of the valve may vary. The maximum achievable valve

stroke with a fully open valve seat varies according to the type and size of the valve:

From 12 mm to 25 mm. During normal operation of an SKP25 actuator, it is also

possible to observe the stability and oscillation tendency in addition to the opening of

the valve seat.

Note!

SKP15.000Ex actuators do not have a valve stroke display!

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Building Technologies Operation Manual and Mounting Instructions VGD4 / VRD4 / SKPx5 CC1U7643en

14.03.2018

2.1 Electrical connection

120 V~/230 V~ activation of the SKPx5 actuator 

N L 1 2

Potential-free end switch

(indicating the

fully closed position) only

with the SKPx5.xx1xx actuator

Closed valve

7643z76en/1017

7643z77en/1017

For all types

6/17

Building Technologies Operation Manual and Mounting Instructions VGD4 / VRD4 / SKPx5 CC1U7643en

14.03.2018

2.2 SKP15 actuator

7643z73/0817

•

Valve stroke display

‚

Indication of operating state (LED)

Power supply

„

End switch (valve CLOSED)

Service note!

No spare parts are available for the SKP15 actuator (security regulating unit).

The entire actuator can only be replaced by contacting the burner manufacturer.

7/17

Building Technologies Operation Manual and Mounting Instructions VGD4 / VRD4 / SKPx5 CC1U7643en

14.03.2018

2.3 SKP25 actuator

7643z7 9/0817

AIR

GAS

•

Valve stroke display

‚

Indication of operating state (LED)

Power supply

„

End switch (valve CLOSED)

…

Setpoint spring setting

†Vent opening /

Assembly of the AGA25.2 damping

throttle

‡

Gas connection

Key

po Control pressure

Service note!

No spare parts are available for the SKP25 actuator (security regulating unit).

The entire actuator can only be replaced by contacting the burner manufacturer.

Note!

The vent opening†must not be closed or clogged as a result of contamination.

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Building Technologies Operation Manual and Mounting Instructions VGD4 / VRD4 / SKPx5 CC1U7643en

14.03.2018

2.4 Description of the VGD4/VRD4 double gas

valve

Work on the VGD4/VRD4 double

gas valve may only be carried out

by qualified personnel.

mbar

Maximum operating pressure

Pmax = 100 kPa DN 40/50

Pmax = 70 kPa DN 65…150

Ambient temperature

-15...+60°C

Valve 1 + Valve 2, Class A, Group 2

according to EN 161

Gas Gaz

<60°C air

Family 1 + 2 + 3

7643z83/0817

Built-in filter, mesh size 0.9 mm

2.5 Mounting position

AGA66

Note!

The AGA66 gasket set increases the degree of

protection for the valve combination from IP54 to

IP65!

2.6 Torques

Max. torques / flange connection and stud screws

according to DIN 939

∂Tighten locking and connecting screws in the

appropriate manner

∂Note the material pairing of aluminum/steel!

DN 40...100 M16 x 65 50 Nm

DN 125 M16 x 75 50 Nm

DN 150 M20 x 80 90 Nm

Max. torque of the pressure connections

M4 G1/8 G1/4 G3/4

3 Nm 8 Nm 15 Nm 35 Nm

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Building Technologies Operation Manual and Mounting Instructions VGD4 / VRD4 / SKPx5 CC1U7643en

14.03.2018

2.7 Installation dimensions for the VGD4 double

gas valve with SKPx5 actuator

7643z70/0318

Type DN A B C D E F G H

SKP15

SKP25

H1 H2 H1 H2

VGD40.040 / L

VRD40.040 40 240 195 168 115 58 88 110 194 382 267 415 300

VGD40.050 / L

VRD40.050 50 240 202 175 115 58 88 125 194 382 267 415 300

VGD40.065 / L

VRD40.065 65 290 214 195 118 60 102 145 200 388 270 421 303

VGD40.080 / L

VRD40.080 80 310 236 204 132 54 107 160 224 412 280 445 313

VGD40.100 / L

VRD40.100 100 350 259 228 145 43 131 180 255 443 298 476 331

VGD40.125 / L

VRD40.125 125 400 305 256 175 31 150 210 303 491 316 524 349

VGD40.150

/ L

VRD40.150 150 480 335 294 188 20 168 240 333 521 333 554 366

VGD41.040

40 240 195 149 115 58 88 110 194 382 267 415 300

VGD41.050

50 240 202 160 115 58 88 125 194 382 267 415 300

VGD41.065

65 290 214 178 118 60 102 145 200 388 270 421 303

VGD41.080

80 310 236 192 132 54 107 160 224 412 280 445 313

VGD41.100

100 350 259 208 145 43 131 180 255 443 298 476 331

VGD41.125

125 400 305 236 175 31 150 210 303 491 316 524 349

VGD41.150

150 480 335 276 188 20 168 240 333 521 333 554 366

Note!

VGD40.xxxL double gas valves are supplied with reverse-mounted connecting plates.

10/17

Building Technologies Operation Manual and Mounting Instructions VGD4 / VRD4 / SKPx5 CC1U7643en

14.03.2018

2.8 Pressure connections

7643z71/0318

VGD40/VRD40

Pressure switch connecting

plate

AGA40.40

Pilot gas connecting plate

AGA40.41

Pressure switch connecting plate (mounted on both

sides)

7643z 71/0418

VGD41

Key

Mounting surface of the QPLx5 pressure switch

+Pressure connection for the QPLx5 pressure

switch

Note!

Remove M4 locking screws as required.

(G 1/4") (G 1/8") (G 1/4") (G 3/4") (G 1/8") (G 1/4")

Strainer

1 9 3

V1 V2

7643z72en/0718

Key

pi Inlet pressure

pm Pressure between valve

V1/V2

po Outlet pressure for valve V2

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