Features
• The monostable spool valves in conformity with IEC 61508 Standard (2010 route 2
H
version)
have TÜV (551 series) and EXIDA (551-553 series) certied with integraty levels: SIL 2 for
HFT = 0 / SIL 3 for HFT = 1
• Series 551 versions according to ATEX 2014/34/EU, for zones 0, 1 and 2 and series 553
air-operated versions for zones 1 and 2
• All the exhaust ports of the spool valve are connectable, providing better environmental
protection. Particularly recommended for sensitive areas, such as clean rooms, and
applications in the pharmaceutical and food processing sectors
• The valves offer environmental protection against the ingress of liquids, dusts or other
foreign matter (environmentally-protected construction)
• The solenoid valves satisfy all relevant EU directives
General
Differential pressure 2 - 10,4 bar [1 bar =100
kPa]
Flow (Qv at 6 bar) 1/4 = 860 l/min (ANR)
1/2 = 3000 l/min
fluids ()
temperature range (TS)
seal materials ()
air, inert gas, ltered
551: -40°C to +80°C
VMQ (silicone) + PUR (polyurethane)
553: -40°C to +60°C
Materials in contact with fluid
()
Ensure that the compatibility of the fluids in contact with the materials is verified
Air operated
CNOMO solenoid (pilot)
interface
(551-553 Series) (551 Series)
Body, end covers
Stainless steel, AISI 316L
Stainless steel, AISI 316L
Spool valve internal parts
Stainless steel, POM
Stainless steel, POM
Seals NBR NBR
Pilot internal parts - Size 30 (E06.05.80N),
refer to catalogue pages:
314/LPKF pilot (contact
us) and 195 pilot (LISC)
Air operated specifications
pipe
size
orifice
size
flow
coefficient
Kv
operating pressure
differential (bar)
prefix optional
basic
catalogue
number
min.
max. (PS)
air ()
()
(mm) (m
3
/h) (l/min) -
Pilot air operated - spring return (monostable)
1/4 6 0,75 12,5 2 10 - 551A121
(1)
1/2 13 2,49 41,5 2 10 - 553A121
(1)
Pilot air operated and return (bistable)
1/4 6 0,75 12,5 2 10 - 551A122
1/2 13 2,49 41,5 2 10 - 553A122
CNOMO solenoid (pilot) interface specifications
pipe
size
orifice
size
flow
coefficient
Kv
operating pressure
differential (bar)
power
level
prefix optional solenoids
basic
catalogue
number
min.
max. (PS)
ATEX / IECEx
air ()
Ex db Ex ia
()
(mm) (m
3
/h) (l/min)
~ =
~/=
(2)
LISC
Solenoid air pilot operated - spring return (monostable)
1/4 6 0,75 12,5 2 10 10 BP
l
- 551A221
(1)
1/4 6 0,75 12,5 2 - 8 LP -
m
551B221
(1)
Solenoid air pilot operated and return (bistable)
1/4 6 0,75 12,5 2 10 10 BP
l
- 551A222
1/4 6 0,75 12,5 2 - 8 LP -
m
551B222
Select 8 for NPT ANSI 1.20.3 or select G for ISO G (228/1) ● Available feature m Available feature in DC only.
- Not available
(1)
Certied IEC 61508 Functional Safety data, use sufx "SL".
(2)
314/LPKF: Contact us
3
15
14
12
24
531
14
12
24
531
12
24
531
14
14
12
24
531
80094GB-2019/R01
BP
RP - MP
LP
UP
Not
available 0,5W
Not
available 7,4W - 7,6W
Ultra Low
power
Low
power
Reduced and
Medium power
Basic
power
POWER LEVELS - cold electrical holding values (watt)
ASCO™ Spool Valves
single/dual solenoid - pilot operated or air operated - stainless steel body - 1/4 and 1/2 tapped
5/2
SERIES
551 - 553
Visit our website at www.emerson.com/asco 1
Prefix table
prex
description
power level
1 2 3 4 5 6 7 UP LP RP BP
t
- - -
l
L I S C Intrinsically safe - 195 pilot (EN/IEC 60079-11)* -
m
- -
Suffix table
sufx
description
power level
1 2 3 4 5 6 7 UP LP RP BP
G D Non-electrical - 1 GD c (551)/ 2 GD c (553) - (EN 13463-5) - - - -
M S Screw type manual operator
(3)
- - -
l
S L Certied IEC 61508 Functional Safety data
(1)
-
m
-
l
Options & Accessories
series
pipe
size
exhaust protector
(stainless steel)
G NPT
551 1/8 34600418
(2)
34600482
(2)
551 1/4 34600419
(2)
34600483
(2)
553 1/2 34600479
(2)
34600479
(2)
lAvailable feature
mAvailable feature in DC only
- Not available
* ATEX/IECEx valves using these solenoids are approved according to
EN ISO 80079-36 (2016) and EN ISO 80079-37 (2016) [non electrical]
(1)
Not to use with MS sufx
(2)
Provided with "SL" sufx
(3)
Not to use with LISC prex
(4)
314/LPKF: Contact us
Product selection guide
STEP 1
Select basic catalogue number, including
pipe thread indentication letter. Refer
to the specications table on page: 1
Example: G551B221
STEP 2
Select prex (combination). Refer to the
specications table and the prex table,
respect the indicated power level.
Air operated version, does not use prex.
Example: LISC
STEP 3
Select sufx (combination) if required.
Refer to the sufx table, respect the
indicated power level.
GD sufx available for air operated ver-
sion only (do not use manual operator
sufx).
Example: -
STEP 4
Select voltage. Refer to standard voltages
on page: 3
Example: 12..24 V
STEP 5
Final catalogue / ordering number
Example:
LISC G551B221 12..24 V
Ordering examples valves:
LISC G 551 B 221 12..24V / DC
LISC G 551 B 222 12..24V / DC
G 551 A 121
G 551 A 121 GD
G 551 A 121 GDSL
G 551 A 122
G 553 A 121
G 551 A 122 GD
prex
pipe thread
voltage
basic number
sufx
80094GB-2019/R02
5/2
SERIES
551 - 553
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Explanation of temperature ranges of solenoid valves
Valve temperature range The valve temperature range (TS) is determined by the selected seal material, the temperature
range for proper operation of the valve and sometimes by the uid (e.g. steam)
Operator ambient temperature range The operator ambient temperature range is determined by the selected power level and the
safety code
Total temperature range The temperature range of the complete solenoid valve is determined by the limitations of both
temperature ranges above
Electrical characteristics
Coil insulation class F
Electrical safety IEC 335
Standard voltages DC (=)
(5)
: 24V - 48V ;
LISC: 12..24V
AC (~)
(5)
: 24V - 48V - 115V - 230V/50Hz
- other voltages and 60Hz are available on request
prefix
option
power ratings
operator
ambient
temperature
range (TS)
safety code
electrical
enclosure
protection
(EN 60529)
replacement coil
type
(1)
inrush
holding
hot/cold
~ ~ =
~ =
(
VA
) (
VA
) (
W
) (
W
)
(C°)
- -
Basic power (BP)
(5)
8,6 1,6 7,4 6/7,6 -25 to +80 II2G Ex d IIB+H2 Gb T4, II2D Ex tb IIIC Db IP65, alu. - - 01
Low Power (LP)
LISC
(3)(4)
- - - 0,5 -40 to +65
II 1G Ex ia IIC T6 Ga, II 2D Ex ib IIIC Db
(3)
IP65, moulded - - 02
- Not available
(1)
Refer to the dimensional drawings on page: 4.
prefix
option
safety parameters
(3)
Min. operating current (I(ON)
min.): 0,036 A / U (ON)
min. = 12,8 V (For use in zone 0 locations,
see the installation conditions given in the I&M instructions)
(4)
Intrinsically safe pilots: Check the electrical characteristics in the corresponding catalogue
pages (LISC: 19500036/LISC pilot).
(5)
314/LPK: Contact us
U
I
= (DC) I
I
P
I
L
I
C
I
(V) (mA) (W) (µF) (mF)
Low Power (LP)
LISC
30 300 1,6 0 0
Electrical connections
prefix connection
(5)
1/2" NPT threaded cable entry. Enclosures are supplied without cable gland
LISC
Spade plug connector with cable gland EN175301-803A (ISO 4400) for cables with an outer diameter from 6 to 8 mm
Additional options
• Mounting on aluminium supply rail, 1/4 or 1/2
• Other pipe threads are available on request
Installation
• Multi language installation/maintenance instructions are included with each valve
• The valves can be mounted in any position without affecting operation
• IEC 61508 Functional Safety (sufx SL). Check temperature range of valve body and solenoid for suitability. For probability of
failure, contact us
• It is necessary to connect pipes or ttings to the exhaust ports to protect the internal parts of the spool valve and its pneumatic
operator if used outside or in harsh environments (dusts, liquids etc.)
• Threaded pipe connection identier is 8 = NPT (ANSI 1.20.3); G = G (ISO 228/1)
• Valves with sufx "SL" are provided with specic exhaust protectors
80094GB-2019/R01
5/2
SERIES
551 - 553
Visit our website at www.emerson.com/asco 3
Dimensions (mm), Weight (kg)
1
Connector rotatable by 90° increments (cable 6 - 8 mm)
2
Manual operator location
3
Ex d certied cable gland (on request)
Connectable pilot exhaust port
TYPE 01-02: CNOMO (551 Series)
size 30 (E06.05.80)
TYPE 03: Air operated
551 Series 553 Series
45
=
=
32
=
=
27,5
==
41
5 x 1/4
13425
73
125
22
==
3250,5
==
146
513
4 2
A
13425
5
12 10
1
72,5
124,5
145
3
45
=
=
27,5
=
=
32
=
=
5x 1/4
G1/8
22
==
50,5 32
4
2
41
==
A
13425
5
12 10
1
124,5
145
3
45
27,5
5 x 1/4
4
2
176
248
107
1
153
360°
360°
45
58,5
M5
553A121 / 553A122
type prefix/option power level
weight
(1)
monostable
bistable
551 553 551 553
01
(2)
BP 1,73 - 2,67 -
02 LISC LP 1,09 - 1,47 -
03 - - 0,86 2,52 0,99 3,07
(1)
Incl. connector(s), except CFVT.
(2)
314/LPKF: Contact us
Accessories
B
ØA
B
ØA
ØA - 1/8 1/4 1/2
B - 10 11 14
exhaust protector
(stainless steel)
2 mounting holes
A
5,3 mm dia.; Spotfacing: 9 mm dia., depth 5 mm
B
6,5 mm dia.; Spotfacing: 11 mm dia., depth 6 mm
Availability, design and specications are subject to change without notice. All rights reserved.
80094GB-2019/R01
195
288
315
2
1/2 NPT
35
98
56
75,5
43
3
360°
1/8 NPT1/8 NPT1/8 NPT
1/8 NPT
TYPE 01:
314 pilot/LPKF operator
EN/IEC 60079-1, 60079-31
551: Contact us
TYPE 02:
Aluminium
195/LISC: EN 60079-11
551B221 / 551B222
TYPE 03:
No prex, IP65
[551 sufxes: GD (II 1 GD c) ; SL (SIL) ;
GDSL (SIL, II 1 GD c)
553 sufxes: GD (II 2 GD c) ; SL (SIL) ;
GDSL (SIL, II 2 GD c)]
Air operated version
551A121 / 551A122
5/2
SERIES
551 - 553
==
= =
40,2
162,5
72,3
1
2
3
45
1
2
3
4
5
G1/4
189
==
= =
= =
40,2
51
4379,5
162,5
63,7 31,6
31,8
75,9
31,6
72,3
1
2
3
45
1
2
3
4
5
B
5 x 1/2
G1/4
189
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