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Solenoid Valve Specifications and Dimensions: 2W025-040 Series

Valve Model



Valve Type

2 Way Normally Closed (NC)


Direct Acting

Cv (Orifice)

0.25 (2.5mm)

Operating Pressure

0 to 150 PSI

0 to 100 PSI

Operating Temperature

Standard: NBR Seal:  -20 to 80°C;  Option: Viton Seal: -10 to 120°C

Port Size (NPT)


Body Materials


Seal Materials:

NBR (Options: Viton )

Coil Protection Insulation Class

H Class IP65 

Coil Duty

100% ED

Coil Power


Electrical Connections



Air, Gas, Liquid, Vacuum  Steam (with Viton Seal)

ALL Standard valves are supplied with CONTINUOUS DUTY COILS of the proper class of insulation for the service indicated on the valve. The coil temperature may become hot after being energized for extended periods, but it is normal. Smoke or burning odor indicates excessive coil temperature and should disconnect the power to the coil immediately. 

VOLTAGES: Standard: 12-24V DC and 24-110-220-230V/50-60 Hz AC. Voltage tolerances: +10% –5% for DC, +10%-15% for AC; .

SERVICE LIFE: The service life of the solenoid valve depends on the operating conditions such as pressure, temperature, type of medium and the voltage. Normally the STC solenoid valves are reliable for more than 5 million cycles.

2W012-040 are DIRECT ACTING solenoid valves and do not require a minimum operating differential pressure. As shown below when the coil is energized (right diagram), it lifts the solenoid plunger, which normally rests on the valve seat and lifts it to open the main valve orifice. When the coil is de-energized (right diagram), the spring force the plunger return to the valve seat to close the valve orifice.



Electrical Coil Connections

For DIN Coil

To connect DIN coil:
1. Remove the Philip screw from the plastic housing and unplug it from the DIN coil.
2. From the screw opening, push the terminal block out from the plastic housing.
3. Note the 1, 2 and ground markings on underside of DIN enclosure.
4. For DC DIN Coil, Connect 1 to Positive, 2 to Negative.
5. For AC DIN Coil, connect 1 to HOT wire, 2 to Neutral wire, and if required connect ground to ground wire.

For Grommet Coil

To connect Grommet coil:
1.  For DC Coil, connect one of the two wires to Positive, and the other wire to Negative.
2. For AC Coil, connect one of the two wires to HOT wire, and the other wire to neutral wire.

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Sizto Tech Corporation 892 Commercial Street, Palo Alto, CA 94303 USA
To order or locate a stocking distributor in your area, call 650-856 8833, Fax to 650- 856
Toll Free: 866-9620170, or email Sales@StcValve.com   
Copyright © 2001-2016 Sizto Tech Corporation, USA, All rights reserved. Last modified: June 15, 2016,
Information contained herein may be changed without prior notification