Severn 4000 Series - V1.1

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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

Head Office – Brighouse UK

Heywoods Industrial Park,

Birds Royd Lane,

Brighouse, HD6 1NA.

T: +44 (0)845 6070 710

E: sales@severnvalve.com

Gloucester UK

Olympus Park,

Quedgeley,

Gloucester, GL2 4NF.

T: +44 (0)845 223 2040

E: sales@severnvalve.com

Chennai India

F96 & F97, SIPCOT Industrial Park,

Irrungattukottai, Chennai,

Tamilnadu, India - 602 117.

T: +91 44 4710 4200

E: sales@severnvalve.com

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