Siemens VRD Series, VRD40.040U, VRD40.xxxU Series, VRD40.050U, VRD40.065UF Technical Instructions

Siemens AG Building Technologies Division

VRD Series

Technical Instructions

Document No. 7649

VRD40.xxxUx

September 08, 2016

VRD40.xxxUx Double Valves
for use with SKP... electro-hydraulic actuators

ISO 9001 and 14001
REGISTERED FIRM

Only with series SKPxx.xxxUx actuators

Description

The normally closed VRDxx.xxxUx series of modular double-body gas valves combine
with SKP… series electro-hydraulic actuators to provide safety shut-off, gas pressure
regulation and/or air-gas ratio control for commercial or industrial gas burners.

Table 1. VRDxx.xxxU model numbers

Model Numbers Body style Connection

VRD40.040U Double NPT thread

VRD40.050U Double NPT thread
VRD40.065UF Double ANSI flange
VRD40.080UF Double ANSI flange
VRD40.100UF Double ANSI flange
VRD40.150UF Double ANSI flange

Technical Instructions VRD4 Series Double Valves
Document Number CC1N7649us
September 08, 2016

Page 2 Siemens AG Building Technologies Division

Features

All Models

 UL listed, FM approved, CSA certified, ISO 9001 and 14000 certified. CE approved versions

available

 Suitable for biogases, process gases, natural gas and air
 Stainless steel mesh inlet filter protects the valve seats as well as downstream components
 ¼" NPT inlet and outlet pressure taps (see Table 2 for details)
 Dual stem guides ensure precise disc alignment and tight shut-off
 Strong sealing force, withstands up to 4 psi differential back pressure
 Valves connected with SKP... actuators open slowly and close rapidly
 Compact VRD40.xxxUx double-valve bodies consist of 2 safety shut-off valves in series
 Each individual safety shut-off valve has double seats to achieve high flow
 Patented seat construction with individual closing spring for each seat to assure reliable

shut-off and high close-off pressure rating

 Full port vent line connection plates are available



NOTE:

VRD40.xxxUx valves and AGA40.xxxxU vent connection plates must be ordered as
separate items (see Table 2).

Application

VRD40.xxxUx valves can be combined with any SKP… series actuator. The actuator can be
mounted while the valve is installed and under pressure.

SKP… regulating actuators are applicable for both low and high supply gas pressure
applications, eliminating excessive regulator inventories. Maximum pressure ratings vary with
valve size (see Table 2).

All VRD40.xxxUx valves perform these functions in combination with each of the following
actuators:

SKP15… Safety shut-off
SKP25… Safety shut-off and constant pressure regulation or zero governor
SKP55… Safety shut-off, pressure regulation and differential pressure air-gas ratio

control

SKP75… Safety shut-off, pressure regulation and adjustable air/gas ratio control

Since more than one function can be performed by a single valve, fewer components and
fittings are required, significantly reducing both the size and weight of the gas train. In addition,
smaller diameter gas valves can be used. For details on valve sizing see the flow charts (figures

2).

CAUTION:

Do not oversize valves equipped with a regulating SKP2... / SKP5... / SKP7… actuator.
Oversizing may limit turndown and could cause oscillations.

VRD4 Series Double Valves Technical Instructions
Document Number CC1N7649us
September 08, 2016

Siemens AG Building Technologies Division Page 3

Ordering
information

Gas valves and actuators are ordered separately. For additional SKP… actuator information, see

the following technical instructions:
SKP15… 155-751P25
SKP25… 155-752P25
SKP55… 155-753P25
SKP75… 155-754P25



NOTE:

The SKP... actuators have an operating temperature range of 14 °F to 140 °F (-10 °C to
60 °C)!

Table 2. Product numbers
Product
number

Size Maximum

operating

pressure

psi

Close-off
pressure

psi

Capacity

CFH

Natural gas

at

P=1" W.C.

Number of test

points,

1/4" NPT

Valve body

material

Inlet Outlet

VRD40.040U 1-1/2" NPT 20 75 1800 1 1 Aluminum

VRD40.050U 2" NPT 20 75 2300 1 1 Aluminum
VRD40.065UF 2-1/2" Flanged 10 75 3.880 1 1 Aluminum
VRD40.080UF 3" Flanged 10 75 5.370 1 1 Aluminum
VRD40.100UF 4" Flanged 10 30 9.680 1 1 Aluminum
VRD40.150UF 6" Flanged 10 30 17.490 1 1 Aluminum

Table 3. Accessories

Part Number Description Notes

AGA40.4050U 1" NPT vent connection plate

Each vent connection includes a ¼" NPT test port, see
Mounting instruction M7631.3 (74 319 0278 0)

AGA40.6580U 1 ¼" NPT vent connection plate
AGA40.0100U 2" NPT vent connection plate
AGA40.0150U 2 ½" NPT vent connection plate

AGA61

Manual adjusting throttle attachment AGA61 permits VRD40.xxxUx series valves to be used as
adjustable limiting orifice valves. Once adjusted, the AGA61 has a provision to be sealed from
tampering.

AGA66

Sealing gasket to provide NEMA 3, NEMA 3R, and NEMA 4 protection.
Gasket kit to SKP...

- Place between actuator SKP… and valve VRD40.xxxUx

- Increases degree of protection from IP54 to IP65

- Refer to Mounting Instruction M7643.2 (74 319 0421 0)

Technical Instructions VRD4 Series Double Valves
Document Number CC1N7649us
September 08, 2016

Page 4 Siemens AG Building Technologies Division

Specifications

Approvals

Agency approvals/standards UL/429, FM/7400,

CSA/ANSI Z21.21/CSA 6.5 C / I
Commercial/industrial
IRI approvable
Agency marks apply only for VRD40.xxxU series
gas valve bodies assembled with SKPxx.xxxUx
actuators.

Operating
environment

Maximum operating pressure See Table 2
Maximum back pressure (differential) 4 psi (300 mbar)
Close-off pressure See Table 2
Permissible gases See Type of gases and Use
Permissible gas temperature 14 °F to 140 °F (-10 °C to 60 °C)
Permissible operating temperature 14 °F to 140 °F (-10 °C to 60 °C)

Use

Functionally, the valves correspond to Siemens gas valves in accordance with UL 429.

They are designed for use with slightly aggressive and dry gases

- Maximum 140 °F (60 °C)

- Gases like biogases, digester gases, process gases, natural gas or air

The valve is used as:

- Shutoff valve (in connection with SKP15...)

- Control valve with shutoff function (in connection with SKP25..., SKP5… or SKP7…)

For SKP... with pressure regulation function (SKP2..., SKP5... and SKP7...) is recommended
to review with Siemens with regard to suitability with the relevant type biogases.

The chemical composition and aggressiveness of each type of biogas or recycling gas is
different, not constant and depends on several factors.

Aggressiveness of the gas against valve materials augments especially

- as the hydrogen sulfide content H2S increases

- as the moisture content and the temperature of the gas increases. Condensation in the

valve is not permitted.

The user must decide after consultation with Siemens whether the valve materials are suited
for the relevant type of gas.
The composition and concentration of the gas components may vary.
It is therefore impossible to provide a guarantee regarding life expectancy.
The suitability in principle is based on tests carried out on the gases to be used.

With VRD40.xxxUx valves in biogas applications. It is recommended to

- install a valve proving device / sequence

- leak test the valves at 6- to 12-month intervals

- install SKPx5... with POC

VRD4 Series Double Valves Technical Instructions
Document Number CC1N7649us
September 08, 2016

Siemens AG Building Technologies Division Page 5

Specifications

Perm. mounting
position

7649z01us/1215

See Mounting notes

Operating pressure

See Type summary

Types of gases

Suitable for biogases, process gas, natural gas or air

- up to maximum 1 vol.% H2S, dry

- up to maximum 1 vol.% NH3, dry

For more information see Use.

Strainer

Built-in, mesh size 0.9 mm

Physical
characteristics

Body materials See Table 2
Weight See Table 6
All valve parts Nonferrous

Connections

Pipe connections NPT threads or ANSI class 150 flanges

(see Table 2)

Pressure and vent taps See Dimensions

Technical Instructions VRD4 Series Double Valves
Document Number CC1N7649us
September 08, 2016

Page 6 Siemens AG Building Technologies Division

Operation

All VRD40.xxxUx gas valves are normally closed, two-way valves. The valves have a standard,
integral, stainless steel mesh filter (0.9 mm) in the inlet to protect the downstream
components against contamination.

VRD40.xxxUx double valves consist of two valves in series. Each valve has a double seat to
achieve high flow (see Figure 1).

All valves have ¼-inch NPT ports for pressure test connection. A full size vent connection plate
is available as an accessory.
See Table 2 and 3 for details on ports and vent connection plates.

7649z02/0514

V

1

V

2

Figure 1. Sectional view of VRD40.065UF

Closing springs:

Each double seat uses one pair of springs. The spring forces act separately as closing forces on
the individual valve seats.

VRD4 Series Double Valves Technical Instructions
Document Number CC1N7649us
September 08, 2016

Siemens AG Building Technologies Division Page 7

Gas flow charts

1 1/2" (40)

2" (50)

2 1/2" (65)

3" (80)

4" (100)

6" (150)

500
400

300

200

100

70

50
40

30

20

10

7

5
4

3

2

1

0.7

0.5

0.4

0.3

0.2

0.1

Pressure drop (in w.c.)

Natural gas
Digester gas

Propane gas

Air

5 7 1000 2 3 4 5 7 10000 2 3 4 5 7 100000 2 3 4

5 7 1000 2 3 4 5 7 10000 2 3 4 5 7 100000 2 3

4 5 7 1000 2 3 4 5 7 10000 2 3 4 5 7 100000 2

4 5 7 1000 2 3 4 5 7 10000 2 3 4 5 7 100000 2 3

Flow rate (SCFH)

7649d01us/0614

Figure 2. Sizing double valves

Assumptions:

1) Pressure downstream of valve is atmospheric

2) Maximum gas temperature of 140 °F

3) Valve in fully open position



NOTE:

Pressure drop is total drop across both valves when using SKPx5…
actuator, with or without an AGA66.

CAUTION:

Do not oversize valves equipped with regulating actuators SKP2…, SKP5… or SKP7…
Oversizing may limit turndown and could cause oscillations.

Technical Instructions VRD4 Series Double Valves
Document Number CC1N7649us
September 08, 2016

Page 8 Siemens AG Building Technologies Division

Dimensions

Dimensions in Inches (mm)
(Shipment conditions: Mounted base plates on both sides)

VRD40.040U / VRD40.050U

a)

a)

G

S

F

A

2

A

7649m04us/1215

1/4"

1/4"

1/4"

a) Base plate

VRD4 Series Double Valves Technical Instructions
Document Number CC1N7649us
September 08, 2016

Siemens AG Building Technologies Division Page 9

Dimensions, continued

Dimensions in Inches (mm)
(Shipment conditions: Mounted base plates on both sides)

VRD40.065UF / VRD40.080UF / VRD40.100UF / VRD40.150UF

M

V

S

G

A

F

a)

a)

7649m05us/1215

1/4" 1/4"

1/4"

a) Base plate

Table 5. VRD40.xxxUx dimensions in inches (mm)

Type A

inch

(mm)

B

inch

(mm)

C

inch

(mm)

D

inch

(mm)

E

inch

(mm)

F

inch

(mm)

G

inch

(mm)

H

inch

(mm)

I

inch

(mm)

J

inch
NPT

K (SW*)

inch

(mm)

L (d =)

inch

(mm)

M (d =)

inch

(mm)

S

inch

(mm)

T

inch

(mm)

U

inch

(mm)

V

inch

(mm)

VRD40.040U 10.24

(260)

7.76

(197)

3.11
(79)

4.53

(115)

1.97
(50)

0.55
(14)

3.46
(88)

5.35

(136)

1.18
(30)

1½" 2.76

(70)

--- --- 0.83
(21)

2.8

(71)

--- ---

VRD40.050U 10.24

(260)

7.76

(197)

3.11
(79)

4.53

(115)

1.97
(50)

0.55
(14)

3.46
(88)

5.35

(136)

1.18
(30)

2" 3.15

(80)

--- --- 0.83
(21)

2.8

(71)

--- ---

VRD40.065UF 11.42

(290)

8.54

(217)

3.25

(82.5)

4.63

(117.5)

2.09

(53.1)

1.46
(37)

4.02

(102)

6.14

(156)

0.63
(16)

--- --- 5.5
(139.7)

0.75
(19)

1.77
(45)

3.64

(92.5)

0.80

(20.4)

7.01

(178)

VRD40.080UF 12.20

(310)

9.39

(238.5)

3.64

(92.5)

5.18

(131.5)

2.09
(47)

0.79
(20)

4.21

(107)

6.30

(160)

0.63
(16)

--- --- 6.0
(152.4)

0.75
(19)

1.2

(30.5)

3.94

(100)

0.88

(22.4)

7.56

(192)

VRD40.100UF 13.78

(350)

10.52

(267.3)

4.33

(110)

5.70

(144.8)

1.93
(49)

1.95

(49.5)

5.16

(131)

7.56

(192)

0.63
(16)

--- --- 7.5
(190.5)

0.75
(19)

2.83
(72)

4.55

(115.5)

0.87
(22)

8.74

(222)

VRD40.150UF 18.90

(480)

13.29

(337.5)

5.71

(145)

7.40

(188)

2.09
(53)

2.30

(58.5)

6.61

(168)

10.31
(262)

0.63
(16)

--- --- 9.5
(241)

0.91
(23)

3.54
(90)

5.61

(142.5)

0.90

(22.9)

10.63
(270)

* SW = width across flats

Technical Instructions VRD4 Series Double Valves
Document Number CC1N7649us
September 08, 2016

Page 10 Siemens AG Building Technologies Division

Dimensions, continued

Dimensions in Inches (mm)

VRD40.xxxUx valve with vent connection plate

Option: a) Base plate
b) Vent connection plate AGA40.xxxxU (optional) to be ordered separately
a) and b) are interchangeable

2

A

7631z49us/0815

Table 6. VRD40.xxxUx dimensions in inches (mm) with mounted vent connecting plate.

Valve model N

inch

(mm)

O

inch

(mm)

P

inch

(mm)

Q

inch

(mm)

R

inch

(mm)

Weight

pounds

(kg)

VRD40.040U 6.38

(162)

3.66
(93)

5.08

(129)

2.76

(70)

0.55
(14)

13.7

(6.2)

VRD40.050U 6.38

(162)

3.66
(93)

5.08

(129)

2.76

(70)

0.55
(14)

13.7

(6.2)

VRD40.065UF 7.13

(181)

4.06

(103)

5.34

(135.6)

3.02

(76.59)

1.46
(37)

18.5
(8.4)

VRD40.080UF 7.28

(185)

4.13

(105)

5.49

(139.5)

3.17

(80.5)

0.79
(20)

21

(9.6)

VRD40.100UF 8.54

(210)

4.76

(121)

6.26

(159)

3.94

(100)

1.95

(49.5)

29

(13)

VRD40.150UF 11.30

(287)

6.14

(156)

7.80

(198)

5.47

(139)

2.28
(58)

53

(24)

VRD4 Series Double Valves Technical Instructions
Document Number CC1N7649us
September 08, 2016

Siemens AG Building Technologies Division Page 11

Dimensions, continued

Dimensions in Inches (mm)

Table 7. AGA40.xxxxU Models

Vent connection plate (optional)

1

/

4

"

N

P

T

7631m18us/1215

VRD40.040U

VRD40.050U

VRD40.065UF

VRD40.080UF

VRD40.100UF

VRD40.150UF

Vent

connection

thread "Z"

AGA40.4050U

● ●

1" NPT

AGA40.6580U

● ●

1¼" NPT

AGA40.0100U

●

2" NPT

AGA40.0150U

●

2½" NPT

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design
improvements are introduced. Other product or company names mentioned herein may be the trademarks of their respective owners.

Siemens AG Building Technologies Division
Berliner Ring 23
76437 Rastatt
GERMANY

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Document No. CC1N7649us

Country of Origin: DE