It all flows from expertise.
4000 Series
Cryogenic Valves
For ratings ANSI 150 – 600
V1.1
Contents
Introduction
01
Engineering data
02
Valve body style options
03
Design Cv Valves
04
Dimensions
05
The Severn 4000 Series was initially developed
over two decades ago specifically to satisfy the
installation in cryogenic ASU and Hyco cold box’s
of an all welded in construction thus preventing
any possibility of process leakage within the
insulated area, while giving full access to the
valve trim from outside the cold box. As such
the 4000 Series now benefits from extensive
experience in providing cost effective and easily
maintained valves in an industry which makes
stringent demands from its suppliers.
Construction materials of the body is either
stainless steel (model 4400) or aluminium (model
4300) to suit adjoining pipework. Internal surface
finish is considered to be of major importance to
ensure degrees of cleanliness that are necessary
for the Industrial Gas Market and therefore all
valves are cleaned and assembled suitable for
oxygen service as standard.
4000 Series Cryogenic Valves V1.1
01
SERIES4000
Engineering Data
Design features
Model 4400 – one piece stainless steel
body/ extension
Model 4300 – aluminium body / stainless steel
extension factory assembled with lifetime seal
Smooth profile globe body construction
Extension lengths to suit installation
Cold box flange adjustable or welded
Screwed in seat standard, cartridge cage
trim options
Large choice of trim sizes available with low noise
and anti-cavitation options
Robust parts for trouble free service and low cost
of ownership
Inherently characterised trims available in linear,
equal percentage or semi-throttle
Cleaned and degreased for Oxygen service
as standard
Soft seat insert option for ANSI Class Vl
Various options of end connection
Benefits
Top-entry servicing with direct access to plug and seat
Reduced inspection and maintenance costs
Extensive trim selection
Reliable leakage performance, bubble tight shut
off available
High interchangeability between sizes and other products
X-ray option available on all welds
02
V1.1 4000 Series Cryogenic Valves
Quality engineered
Extensive proven on-site performance
BS EN ISO 9001
End connection sizes/types
1/2in (12mm) – 10in (250mm)
Design standards
ANSI B16.34 and design rated.
Valve body ratings
ANSI 150 – ANSI 600.
Body face to face dimensions
ISA S75.03 see Table 6.
Valve plug options
Unbalanced Top Guided. Balanced for
port diameters see Table 1.
Actuation
Various types of actuation are available
including: Series P Linear Spring pneumatic
cylinder manually operated.
Standard bonnet packing
Braided PTFE, PTFE Chevrons, Graphite and
Low Emission and Fugitive Emission.
The specially designed extended bodies incorporate
top guided contoured trim configuration which
provides excellent rigidity and resistance to
vibration and service wear. The valve is designed to
accommodate other options within the Severn range
e.g CC cages and anti-cavitation trims.
Instruments
A wide range of control instruments are available from
Severn including: Positioners, Volume Boosters, Solenoid
Valves, Switches and Air File Regulators etc.
Trim options
Unbalanced Contoured, Cage, Multi-step and Tickle.
Inherent trim characteristics
Equal %, Linear and Semi-throttle.
Maximum plug / Seat leakage class
ANSI/ FCI 70-2 Class lV as standard Class lV with
soft seat.
Materials of construction
The standard body materials are Stainless steel
and Aluminium. For full listing see table page 4.
Temperature range
-196ºC to 220ºC (-320ºF to 428ºF). For temperatures
outside this range consult factory.
Available connection styles
End Connection: Valve size: Rating Screwed,
Socket Weld and Flanged.
Engineering Data
4000 Series Cryogenic Valves V1.1
03
General
The 4000 Series range of cryogenic valves was developed
to provide a cost effective, reliable and easily maintained
control valve capable of being applied in a flexible manner
to accommodate various approaches to insulated cold box
or valve chest design. Reliability and ease of maintenance
are essential features of any good control valve and the
quick change trim provides for easily accessible seat and trim
components to minimise any parts replacement times.
Valve body style options
The Severn 4000 Series valve is available in three body
styles of either globe, angle or Z pattern. Many parts are
interchangeable, with exception of the valve bodies. The angle
pattern has an optional venturi seat which may be specified
in order to provide additional protection to the valve outlet.
Bonnet
The standard bonnet provides a deep packing box together
with a long guide housing, which is a robust and vibration
resistant assembly. The standard packings used are Teflon
rings which are suitable for application temperatures of
-196ºC up to 220ºC.
Extended body
The body extension is available in a selection of lengths to suit
the depth of associated pipework. The guide design located in
close proximity to the plug head and allows controlled gassing
off to occur into the body extension chamber thereby protecting
the packing from coming into contact with liquid gas.
Bellows seal option
This arrangement provides for a positive metallic
gland seal, within the rated pressure and
temperature of the bellows material selected.
Generally used on semi UHP service to ensure non
ingress of impurities into the process. An auxiliary
packing in the bonnet serving as a back-up seal in
the unlikely event of a bellows failure.
Cold box flanges
A sliding weather proof or welded cold box flange
of any size or shape can be fitted as required.
Severn 4000 Series – Design Cv Values
04
V1.1 4000 Series Cryogenic Valves
Valve Body
Material
Bonnet
Valve Plug /
Stem Assembly
Seat Ring
Soft Seat Option
Cage Option
Aluminium
ASTM 5083
Stainless Steel
(AISI 321)
Stainless Steel
(AISI 316)
Stainless Steel
(AISI 321)
PTFE
Stainless Steel
(AISI 321)
Stainless Steel
Alloy Steel
Stainless Steel/
HT Brass
HT Brass
PCTFE
(KELF)
Monel
Monel
Stainless Steel/
Stellite 6
Stainless Steel/
Stellite 6
Copper
Alloy Steel
HT Brass
Monel
Monel
Aluminium
Valve Size
Available Trim Cv’s
in
mm
1/2
12
0.01
0.05
0.10
0.15
0.25
0.5
2.5
3/4
20
1.5
2.5
25
1.5
2.5
15
11/2
40
16
20
30
50
16
20
30
50
80
20
30
50
80
120
100
50
80
120
195
215
150
120
215
325
400
440
200
215
325
440
650
Table 1. Materials of Construction
Table 2. Contoured and multi-step trims
Flow Coefficient Cv
The values detailed in the tables are stated in US units. The figures by definition are related to the flow of water (SG=1)
through the valve at full tilt in US Gallons per minute with a pressure drop of 1lb/in.
Note: Multi-step trim range in bold digits. For other options – Consult Factory.
Valve Size
Available Trim Cv’s
in
mm
25
15
1 1/2
40
15
20
30
50
20
30
50
80
50
75
110
100
50
75
110
195
150
110
195
275
400
200
400
650
10
250
650
1000
Table 3. Single Stage Cage Trims
Note: For valve and trim sizes outside this range – Consult Factory.
4000 Series Cryogenic Valves V1.1
05
Valve Size
D/E
Actuator
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
Selection
0.5
12.5
8.25
210
2.375 60.3
1.9
48
3.93
100
2.375 60.3
9.438 250
2.25
143
0.75
19
8.25
210
2.375 60.3
1.9
48
3.93
100
2.375 60.3
9.438 250
2.25
143
25
8.25
210
2.375 60.3
1.9
48
3.93
100
2.375 60.3
9.438 250
2.25
143
1.5
40
9.875
251
2.88
73
2.88
73
4.92
125
2.88
73
10.82 275
2.75
165
A/B
50
11.25
286
3.5
88.9
3.25
82.5
4.92
125
A/B
80
13.25
337
4.5
115
4.5
115
6.10
155
B/C
100
15.5
394
5.55
142
5.55
142
7.25
184
B/C
150
18.62
473
8.62
219
B/C
150
20
508
8.62
219
200
22.37 568
10.75
273
200
24
610
10.75
273
10
250
26
660
12.75
324
10
250
28
771
12.75
324
Size in
1.5
10
Weight lb
77
82
88
154
205
310
580
750
Weight kg
35
37
40
70
93
140.6
263
340
Table 4
Table 5. Weights
Note: weights apply to Stainless Steel bodied valve, actuator, positioner and airset.
Series 4410
Globe Style
Series 4330
Angle Style
Series 4350
Z-Pattern Globe Style
To suit customer’s requirements
To suit customer’s requirements
To suit customer’s requirements
Our policy is one of continuous improvement and we reserve the right to modify these specification details without notice.
www.severnvalve.com
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Heywoods Industrial Park,
Birds Royd Lane,
Brighouse, HD6 1NA.
T: +44 (0)845 6070 710
E: sales@severnvalve.com
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Quedgeley,
Gloucester, GL2 4NF.
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Chennai India
F96 & F97, SIPCOT Industrial Park,
Irrungattukottai, Chennai,
Tamilnadu, India - 602 117.
T: +91 44 4710 4200
E: sales@severnvalve.com
V1.1