Siemens VRD40.040, VGD40.050/L, VGD40.065/L, VRD40.050, VRD40.065 Operation Manual And Mounting Instructions

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!

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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 gas­fired 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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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

/CL

OSE

D

With v

alvestrokedisplay

Withou

tendswitc

h

With c

onstantpressuregove

rno

r

A

I

R

TheSKP15/SKP2

5actuator

s

c

a

nbe

c

o

mbineda

twillwiththeVGD4/VRD4doublegasvalves.

1 x VGD40/VRD40 + 2 x SKP15

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2 Description of the SKPx5 actuators

Operating mode display

Valve stroke display

7

6

43z81en/101

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!

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2.1 Electrical connection

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

7643z43/070

6

N L 1 2

3

1

2

3

 Potential-free end switch
(indicating the
fully closed position) only
with the SKPx5.xx1xx actuator

123

123NL

Closed valve

7643z76en/1017

7643z77en/1017

For all types

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2.2 SKP15 actuator

7643z73/0 817

1

2

3

4

•

Valve stroke dis play

‚

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.

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2.3 SKP25 actuator

7643z79/0817

1

2

3

4

5

7

6

AIR

GAS

•

Valve stroke dis play

‚

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.

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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

7643z

84/03

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 connect ing 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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2.7 Installation dimensions for the VGD4 double

gas valve with SKPx5 actuator

7643z 70/0318

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.

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2.8 Pressure connections

7643z71/0318

VGD40/VRD40

VGD40/VRD40

Pressure switch connecting

plate

AGA40.40

7643z

71/0418

Pilot gas connecting plate

AGA40.41

Pressure switch connecting plate (mounted on both
sides)

7643z71 /0418

VGD41

VGD41

Key

Mounting s urface of the QPLx5 pressure switch

+

Pressure connection for the QP Lx5 pressure

switch

Β

Not e!

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

452

7

6

8

V1 V2

7643z72en/0718

10

Key

pi Inlet pressure

pm Pressur e between valve

V1/V2

po Outlet pressure for valve V2

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3 Description of the mountable QPLx5

pressure switches

The QPLx5 pressure switch is designed to monitor the gas pressure. When the
pressure falls below or exceeds the adjusted switching point, the respective electrical
circuit will be opened or changes over.

Caution!
Service note!
The QPLx5 also has to be replaced when replacing a valve.
It is recommended to replace the QPLx5 after over 50,000 cycles or a service
life of 10 years due to the designed lifetime for gas pressure switches
according to AFECOR. It is not recommended to reinstall these, even if the
seals on the valve have been replaced.

¼'' double nipple required

7

631z5

4en/0

318

pipop (p)

m vps

QPL25

QPL25

p

i

QPL15

QPL15

QPL15

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Attachment options

7

643z85/0318

QPL15

pm

QPL15

pm

QPL15

pi

7643z86/0318

7

643z87/0318

3x pressure switches (2x pm, pi) Example (not binding)

Valve proving control "A"

Example (not binding)

Valve proving control "B" and

pressure switch QPL15 (pi) below

Key

pi Inlet pressure

pm (pvps) Pressure between valve V1/V2

po Outlet pressure for val ve V2

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4 Connection diagram

4.1 Function as a minimum/maximum pressure

switch

Minimum pressure switch

When the pressure falls below the set

value, NO opens and NC closes

Maximum pressure switch

When the pressure exceeds the set value,

NC opens and NO closes

4.2 Connection via connector AGA65 according to

DIN 43650

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5 Technical data

5.1 SKPx5 actuator

Operation DIN EN 60721-3-3

Climatic condit ions Class 3K3
Mechanical conditions Class 3M3
Temperature range -10…+60°C

(longer opening times below 0°C)

-20…+60°C
(with heating element AGA63.5A27)

↑ SKP25.2 -10…+50°C

(restricted operating conditions
Humidity <95% r.h.
Installation altitude Max. 2,000 m above sea level

5.2 VGD4/VRD4 double gas valve

Operation DIN EN 60721-3-3

Climatic condit ions Class 3K5
Mechanical conditions Class 3M2
Temperature range -10…60°C
Humidity <95% r.h.
Installation altitude Max. 2,000 m above sea level

Β

Note!
For the model number of the VGD4/VRD4 double gas valve, see the nameplate on
the SKPx5 actuator!

5.3 QPLx5 pressure switch

Operation DIN EN 60721-3-3

Climatic condit ions Class 3K5
Mechanical conditions Class 3M2
Temperature range -15…+60°C
Humidity <95% r.h.

Caution!
Condensation, formation of ice, and ingress of water are not permitted.

Environmental
conditions

Environmental
conditions

Environmental
conditions

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6 Spare parts and accessories

Please note the different article numbers for the VGD4/VRD4 double gas valves and
the SKPx5 actuator when ordering spare parts.

Article no Type

Adapter plug

For powering both SKPx5 actuators on the
VGD4/VRD4 double gas valve with an
AGA64 connector.

BPZ:AGA62.000A000 AGA62.000A000

Contact box for valve actuator (power supply)

∂ Plug-in connector conforming to DIN EN

175301-803-A

∂ 3-pole + protective ground
∂ Ø 6…9 mm / max. 1.5 mm²

BPZ:AG A64 AGA64

Contact box for end switch

∂ Plug-in connector conforming to DIN EN

175301-803-A

∂ 3-pole + protective ground
∂ Ø 4.5…11 mm / max. 1.5 mm²

BPZ:AG A65 AGA65

Heating element

∂ For use at low ambient temperatures

(-10…< -20°C)

∂ Refer to data sheet N7923

BPZ:AGA63.5A27 AGA63.5A27

Gasket set

∂ For mounting between SKPx5 actuator and

VGD4/VRD4 double gas valve

∂ Increases degree of protection from IP54 to IP65
∂ Take note of data sheet N7631 when using

VGD4/VRD4 double gas valves

∂ Refer to Mounting Instruction M7643.2

(74 319 0421 0)

BPZ:AG A66 AGA66

Damping throttle for the SKP25 actuator

Optional

BPZ:AGA25.2 AGA25.2

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Article no Type

Setpoint spring (yellow/gold) for SKP25 actuator

∂ Optional for built-in standard spring AGA29
∂ 1.5…12 kPa for SKP25.0 actuator
∂ 7…70 kPa for SKP25.4 actuator

(optionally for AGA23 setpoint spring)

∂ Ø 1.6 mm

BPZ:AG A22 AGA22

Setpoint spring (red) for SKP25 actuator

∂ Optional for built-in standard spring AGA29
∂ 10…25 kPa for SKP25.0 actuator
∂ 15…150 kPa as a standard spring for SKP25.4

actuator

∂ Ø 1.8 mm

BPZ:AG A23 AGA23

Setpoint spring (unpainted) for SKP25.0 actuator

∂ Equivalent built-in standard spring
∂ 0.05…2.2 kPa
∂ Ø 1 mm

BPZ:AG A29 AGA29

AGA30.x setpoint fine adjustment for SKP25

actuator

∂ Packaging version with one setpoint spring each
∂ Refer to Mounting Instruction M7643

(74 319 0926 0)

Setpoint spring (gold)

∂ 1.5…12 kPa
∂ Ø 1.6 mm

BPZ:AGA30.0 AGA30.0

Setpoint spring (red)

∂ 10…25 kPa
∂ Ø 1.8 mm

BPZ:AGA30.1 AGA30.1

Setpoint spring (unpainted)

∂ 10…36 kPa
∂ Ø 2 mm

BPZ:AGA30.2 AGA30.2

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7 Lifetime

The combination of VGD4/VRD4 double gas valve and SKPx5 actuator has a design
lifetime* of

Nominal size Burner startup cycles

′DN 25 200,000

DN 25...80 100,000

DN 80...150 50,000

when using gases according to EN 437 (or DVGW specification G260).

This is based on the endurance tests specified in the standard EN 161.
A summary of the conditions has been published by the European Control
Manufacturers Association (Afecor) (www.afecor.org).

The designed lifetime is based on the use of a VGD4/VRD4 double gas valve and an
SKPx5 actuator according to the manufacturer’s data sheet. After reaching the
designed lifetime in terms of the number of burner startup cycles, or after the
corresponding usage time, the VGD4/VRD4 double gas valve and SKPx5 actuator
must be checked and/or replaced by authorized personnel.

The criteria set out in EN 161 / EN 13611 are applicable when testing the tightness.
This test can be omitted if a valve proving system is in place.

* The designed lifetime is not the warranty time specified in the Terms of Delivery.

Safety components

Structural lifetime

CEN standard

Number of cycles Time (years)

Gas pressure monitor 50,000 10 EN 1854

Double gas valve (with valve proving
system)

After detecting a fault EN 1643

Double gas valve (without valve proving
system)

50,000…200,000 10

EN 126
EN 161

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Berliner Ring 23
76437 Rastatt, Germany
Tel. [phone]
Fax [phone]
www.siemens.com

© 2018 Siemens AG Building Technologies

Subject to change!