VALVES

3/2
S398

2

pressure operated
stainless steel body
with socket welding ends PN40, DN 15 to 50

Series

3 1

U

2

3 1

FEATURES

•t Ruggedly built valve, particularly recommended for use with steam, superheated
water, corrosive fluids
•t High-performance, maintenance-free stuffing box, resistant to thermal shock
•t Mixer function (two pressure inlets at 1 or 3, one outlet at 2) or distributor function
(one pressure inlet at 2, two outlets at 1 and 3)
•t Vacuum operation up to 10-2 mbar
•t Allowable backpressure: up to 40 bar
•t Optical position indicator as standard
•t Autoclavable valve for use at high ambient temperatures (up to 180°C)
•t The valves satisfy Pressure Equipment Directive 97/23/EC

•t The valves in conformity with IEC 61508 Standard (2010 route 2H version) certified with integrity levels: SIL 2 for HFT = 0

GENERAL

Differential pressuret
Maximum allowable pressuret
Ambient temperature ranget
Maximum viscosityt
Pilot fluidt
Max. pilot pressuret
Min. pilot pressuret

0 to 40 bar [1 bar =100 kPa]
40 bar (within the specified limits, see diagram I)
-25°C to +180°C
5000 cSt (mm2/s)
Air
10 bar
See below

fluids ()

temperature range

disc seal ()

DN 15-20-25: air and gas groups 1 & 2
DN 32-40-50: air and gas group 2
all DN: water, oil, liquids groups 1 & 2 and steam

- 10°C to + 250°C

bronze PTFE

mixer function

Minimum pilot pressure

10

P (bar)

distributor function

(3ô2)

(1ô2)

10

4,7-DN 20

4,6

P (bar)

(2ô1)

(2ô3 )

4,6

3,6-DN 50
25
3,4-DN 40
3,3-DN 20
3,0-DN15
2,9-DN32
2,4-DN 20
1,7-DN 15
1,5-DN50
1,4-DN32
1,3-DN 25
0,75-DN 40
40
p (bar)

3,9-DN 50
3,5-DN 25-40
3,4
3,2-DN32
3,1-DN15
2,4-DN 20 DN 20-2,2

3,4
DN 20-2,4
DN 15-1,7
DN 32-1,4
DN 50-1,3
DN 25-1,1
DN 40-0,6
0

10

20

1,7-DN 15
1,4-DN32
1,3-DN 25
1 1,2-DN 50
0,7-DN 40
40
p (bar)

30

CONSTRUCTION

Socket welding endst

DN 15-1,5
32
DN 50-1,1
DN 25-0,8
DN 40-0,3
0

10

20

30

1

F

2
3

EN 12760

() Ensure that the compatibility of the fluids in contact with the materials is verified
Body and plugt
Stainless steel
Stuffing box housingt
Stainless steel
Stem, disct
Stainless steel
Stuffing box packingt
PTFE chevrons
Disc sealt
Bronze PTFE
Valve body sealt
Graphite

OTHER MATERIALS
Operatort

P (bar)

max. pressure

00181GB-2014/R02
Availability, design and specifications are subject to change without notice. All rights reserved.

MATERIALS IN CONTACT WITH FLUID

DN

(mm)

2

distributor
1

2

2

3

2

21

t (°C)
233 250

fluid temperature

flow coefficient
Kv
3

24

100

Aluminium, nickel plated

mixer

diagram I

20

SPECIFICATIONS
ext. pipe
diameter

40

40

1

(m3/h) (l/min) (m3/h) (l/min) (m3/h) (l/min) (m3/h) (l/min)

pilot
pressure
(bar)

operating
pressure
differential

operator
diameter

min.

max.

(bar)

(mm)

❉
❉
❉
❉
❉
❉

10
10
10
10
10
10

40
40
40
40
40
40

80
100
100
150
150
200

catalogue number

U - Universal
15
20
25
32
40
50

22,4
27,7
34,5
43,2
49,5
62

3,3
8,0
11,4
18,9
27
51

54
133
190
316
450
850

4,4
7,4
11,6
16,6
27
51

73
123
194
278
450
850

3,5
8,1
12,1
17,9
27
51

59
136
203
299
450
850

4,6
7,7
11,9
16,6
27
51

78
129
199
278
450
850

S398A001
S398A002
S398A003
S398A004
S398A005
S398A006

❉t Minimum pilot pressure varies with differential pressure. See piloting chart above.

All leaflets are available on: www.asconumatics.eu
V755-1