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
Β
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!

2/17
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.

3/17
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
W
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
/
C
L
O
S
E
D
With v
a
l
v
e
s
t
r
o
k
e
d
i
s
p
l
a
y
Withou
t
e
n
d
s
w
i
t
c
h
With c
o
n
s
t
a
n
t
p
r
e
s
s
u
r
e
g
o
v
e
r
n
o
r
A
I
R
T
h
e
S
K
P
1
5
/
S
K
P
2
5
a
c
t
u
a
t
o
r
s
c
a
n
b
e
c
o
m
b
i
n
e
d
a
t
w
i
l
l
w
i
t
h
t
h
e
V
G
D
4
/
V
R
D
4
d
o
u
b
l
e
g
a
s
v
a
l
v
e
s
.
1 x VGD40/VRD40 + 2 x SKP15

4/17
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
7
6
4
3
z
8
1
e
n
/
1
0
1
7
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.
Β
Note!
SKP15.000Ex actuators do not have a valve stroke display!

5/17
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 
7
6
4
3
z
4
3
/
0
7
0
6
N L 1 2
3
1
2
3
Potential-free end switch
(indicating the
fully closed position) only
with the SKPx5.xx1xx actuator
1
2
3
1
2
3
N
L
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
1
2
3
4
•
Valve stroke display
‚
Indication of operating state (LED)
ƒ
Power supply
„
End switch (valve CLOSED)
Β
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
1
2
34
5
7
6
AIR
GAS
•
Valve stroke display
‚
Indication of operating state (LED)
ƒ
Power supply
„
End switch (valve CLOSED)
…
Setpoint spring setting
†Vent opening /
Assembly of the AGA25.2 damping
throttle
‡
Gas connection
Key
po Control pressure
Β
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.
Β
Note!
The vent opening†must not be closed or clogged as a result of contamination.

8/17
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
7
6
4
3
z
8
4
/
0
3
1
8
AGA66
Β
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

9/17
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
Β
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
VGD40/VRD40
Pressure switch connecting
plate
AGA40.40
7
6
4
3
z
7
1
/
0
4
1
8
Pilot gas connecting plate
AGA40.41
Pressure switch connecting plate (mounted on both
sides)
7643z 71/0418
VGD41
VGD41
Key
Mounting surface of the QPLx5 pressure switch
+Pressure connection for the QPLx5 pressure
switch
Β
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
4
5
2
76
8
V1 V2
7643z72en/0718
10
Key
pi Inlet pressure
pm Pressure between valve
V1/V2
po Outlet pressure for valve V2