Specifications: 2L25025B is an AirTAC 2L 2/2-way internally piloted, normally closed solenoid valve. 250 identifies the orifice-size branch; port code 25 selects PT1; voltage code B selects DC24V; electrical entry is terminal connector. The omitted thread suffix selects PT threads.
Product Catalogs and Comparison Guide
Download Airtac 2L Product Catalog (PDF)
Download Airtac 2LA Product Catalog (PDF)
Legacy coil and mounting-accessory selection: catalog page 205 (PDF)
New shared coil and mounting-accessory selection: 2KLA PDF page 5 (printed page 196)
For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.
AirTAC 2L vs 2LA: Dimensions and Replacement Guide
Ordering and Delivery
Orders for 2L25025B will be supplied as 2LA25025B (2LA). This is our ordering and delivery policy. It does not mean that the old and new dimensions, mounting details or electrical data are identical. The technical information below describes 2L25025B in the 2L catalog. For the supplied replacement, check the new catalog and comparison guide before installation.
Operation and Construction
This two-port, two-position valve is normally closed in its unenergized state. The valve uses internal pilot operation and requires the stated pressure differential to operate. The catalog specifies a SUS304 stainless-steel body, a PTFE (Teflon) standard seal, Class H coil insulation and IP65 coil protection. The compact construction is intended to make installation and removal convenient.
Model Code Explained
Code position
Meaning for this model
Family
2L — 2/2-way internally piloted, normally closed
Size code
250 — 25 mm orifice
Port-size code
25 — PT1
Voltage code
B — DC24V
Electrical-entry code
Omitted — terminal
Thread code
Omitted — PT
Technical Specifications
Parameter
Details
Actuation and normal state
Internally piloted; normally closed
Suitable fluids
Steam, high-temperature water and oil
Orifice diameter
25 mm
Flow coefficient Cv
12.50
Effective flow area
220 mm²
Operating pressure differential
0.05–1 MPa differential (inlet pressure minus outlet pressure).
Proof pressure
1.5 MPa
Body material
SUS304 stainless steel
Standard seal
PTFE (Teflon)
Viscosity limit
Under 20 cSt in the general specification; see the separate low-oil-temperature footnote below.
Oil temperature
−10 to 150°C; the −10°C entry carries a footnote stating 50 cSt or less.
Water temperature
1 to 150°C
Steam temperature
Maximum 183°C; the minimum is not stated.
Ambient temperature
−20 to 100°C
Catalog reference weight
1120 g; terminal version.
Operating differential is the pressure difference across the valve, not an independent flow rating. The general viscosity limit and the oil-temperature footnote are both retained from the source; they must be checked together for the intended fluid. Catalog weight is a reference value; the actual product prevails.
Electrical Specifications
Parameter
Details
Rated voltage
DC24V
Electrical entry
terminal connector
Coil family listed for this valve
CDA116
Supply tolerance
±10%
Supply frequency
DC; frequency is not applicable.
Power consumption
6.5 W
Catalog temperature rise
30°C
Coil insulation
Class H
Coil protection
IP65
External and Mounting Dimensions
The following values are from the 2L terminal drawing, PDF page 4 (printed page 213). Each letter refers to its own dimension line. Values are in millimetres except threads; “—” means that the source does not list a value.
Drawing reference
Current configuration
A — drawing length A
81 mm
AB — body span AB
92 mm
B — drawing width B
59 mm
BA — port-side span BA
40.5 mm
C — drawing height C
124 mm
D — drawing dimension D
95 mm
E — drawing dimension E
6.4 mm
EA — drawing dimension EA
8 mm
EB — drawing dimension EB
80 mm
EC — drawing dimension EC
44.5 mm
F — drawing dimension F
36 mm
P — fluid port thread P
PT1
The drawing labels the mounting bracket as optional. D, E, EA, EB, EC and F are separate installation references; do not combine dimension lines into an invented overall measurement.
Drawing check required: the source table lists A=81 mm and AB=92 mm for this terminal version. These values are reproduced exactly, although the drawing makes their relationship unclear. Confirm the approved drawing before using this combination for installation or interchangeability.
For detailed product dimensions and mounting drawings, please download and refer to the PDF catalog.
Flow and Performance Charts
This configuration has a 25 mm orifice, Cv 12.50 and 220 mm² effective area.
The catalog provides a chart labelled “Fluid: Vacuum” showing P2, upstream-pressure curves P1, a minimum-working-pressure boundary, subsonic/sonic regions and a critical-pressure boundary. Its Q axis is labelled L/min (ANR), with separate scales for Ø15, Ø20, Ø25, Ø35, Ø40 and Ø50 mm. The P2 chart reaches 1.0 MPa. The water chart plots Q in L/min against ΔP=P1−P2 in MPa; marked scales run from 0.02 to 0.5 MPa and 30 to 900 L/min. Its large intermediate curve is labelled Ø32, while the 320 ordering/specification table states a Ø35 mm orifice; retain this source distinction when reading the graph.
Read the actual curve for the operating condition in the PDF. Axis maxima, plotted endpoints and other bore-size curves are not guaranteed flow ratings for this model; no interpolated flow claim is added here.
Internal Structure Reference
The catalog cross-section is labelled 2L150 (grommet). The numbered names below identify that reference drawing; they are not a packing list, individual ordering codes, quantities or a claim that every branch has an identical construction.
Drawing item
Component name
1
Body
2
Fixed ring
3
Airtight gasket
4
O-ring
5
Wear ring
6
Gasket
7
Screw
8
Spring
9
Cover
10
Spring
11
Screw
12
Spring
13
Spring washer
14
Coil assembly
15
Washer
16
E clip
17
Movable core
18
Fixed plate
19
O-ring
20
Fixed cap
21
Airtight ring
22
Plug
23
Spring
24
Piston
25
Spacer
26
O-ring
Mounting Accessories and Selection
The catalog accessory selection identifies F-2S250LB as the optional LB mounting bracket for this size branch. The valve drawing shows an optional bracket; the catalog does not identify it as included with the valve or list its packing quantity. Order the bracket separately when required, after confirming the mounting arrangement.
Match the full voltage, electrical entry, thread and normal-state configuration. A valve series update does not establish that its old coil, connector or mounting bracket fits the new generation. Follow the flow direction shown on the body and check the exact catalog drawing before installation.
Series Ordering Options
The following are available choices within 2L. The current model uses only the configuration decoded above; H applies to the direct-acting 030/050 branches.
Ordering position
Permitted catalog choices
Direct-acting branches
030: port codes 06 (1/8) or 08 (1/4); 050: 10 (3/8) or 15 (1/2). Pressure code omitted = standard; H = high pressure.
Internally piloted branches
150/15 = Ø15 mm, 1/2; 200/20 = Ø20 mm, 3/4; 250/25 = Ø25 mm, 1; 320/32 = Ø35 mm, 1 1/4; 400/40 = Ø40 mm, 1 1/2; 500/50 = Ø50 mm, 2.
Voltage codes
A = AC220V; B = DC24V; C = AC110V; E = AC24V; F = DC12V.
Electrical-entry choices
Omitted = terminal; I = grommet / flying lead, length 0.5 m.
Thread choices
Omitted = PT; G = G thread; T = NPT. These are alternatives, not simultaneous features.
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