AIRTAC 2V025-08BI 24V Solenoid Valve

1. Model Explanation

2. コア技術パラメータ

3. 製品の特徴
4. Direct-acting structure: Operates reliably with no minimum pressure differential, suitable for low-pressure and vacuum applications
5. Fast and sensitive switching: Short response time ensures efficient system operation
6. コンパクトな設計: Small size, lightweight, saves installation space
7. High-quality materials: Corrosion-resistant brass body, Class B heat-resistant coil (最大. 130℃), Viton seals compatible with various media
8. Electrical connection: DIN43650A standard plug, stable connection, easy coil replacement
9. Wide application: Used in pneumatic control, fluid transfer, water treatment, lubrication systems and other industrial fields
10. インストール & Operation Guidelines
11. Mounting orientation: Vertical mounting with coil upward is recommended; can be mounted at any angle (observe flow direction arrow)
12. Medium requirement: Use clean, impurity-free medium; filter (≤80μm) installation is recommended
13. Electrical connection: Use DIN43650A standard plug to ensure watertight sealing
14. Maintenance cycle: Inspect seals and coil condition regularly based on medium cleanliness
15. 予防: Avoid use in corrosive gas or dusty environments; special models required for special media (e.g. fuel gas)
16. アプリケーション

Control of cylinders and actuators in pneumatic control systems

Auxiliary circuit control in hydraulic systems

Fluid on/off control in water treatment equipment

Fluid control in printing and packaging machinery

Lubrication system control for small equipment

Pneumatic circuit control in vacuum systems

6. Replacements & 互換性

Same-series replacements: 2V025-08B (lead wire type), 2V025-08A (AC220V)

Other brand replacements: SMC VT307 series, FESTO direct-acting 2/2-way solenoid valves

Mounting dimensions compatible with standard 1/4″ PT threaded solenoid valves

Complete Model List of AIRTAC 2V Series (2/2-Way Solenoid Valves)

AIRTAC 2V series includes direct-acting (2V025) and pilot-operated diaphragm type (2V130/250), both normally closed.

1. 2V025 Series (Direct-acting, φ2.5mm orifice)

2V025-06 (1/8″ PT)

2V025-08 (1/4″ PT)

Voltage suffix: A=AC220V, B=DC24V, C=AC110V, E=DC12V

Electrical connection: I=DIN43650A plug (e.g. 2V025-08BI), no I=lead wire type

2. 2V130 Series (Pilot-operated, φ13mm orifice)

2V130-10 (3/8″ PT)

2V130-15 (1/2″ PT)

3. 2V250 Series (Pilot-operated, φ25mm orifice)

2V250-20 (3/4″ PT)

2V250-25 (1″ PT)

Cross Reference of 2V Series with Major Brands (2/2-Way Solenoid Valves)

1. Direct-acting Type (2V025 Series)

2. Pilot-operated Type (2V130/250 Series)

Selection & Replacement Notes

Structure distinction: 2V025 is direct-acting (usable at 0 pressure differential); 2V130/250 are pilot-operated (require ≥0.05MPa differential)

Port compatibility: All with PT threads, directly replace same-port, same-voltage SMC/FESTO 2/2-way valves

Seal material: 2V025 uses Viton (oil/water/air resistant); 2V130/250 use NBR (better for air/water)

Voltage & connection: Verify DC24V/AC220V and DIN plug/lead wire type to avoid misconnection

Working Principle of AIRTAC 2V Pilot-Operated Solenoid Valves (2V130 / 2V250)

AIRTAC 2V130 / 2V250 are pilot-operated normally closed 2/2-way solenoid valves, with a completely different principle from the direct-acting 2V025.

1. コア構造 (Pilot-operated = Small valve controls large valve)

It consists of two internal parts:

1. Pilot spool (small coil, small orifice)
2. Main spool (large diaphragm/piston, controls main flow path)

The coil only opens the pilot orifice without directly lifting the main valve seat — the main valve is opened by the pressure of the medium itself.

2. De-energized (通常閉)

Coil de-energized, pilot orifice closed

Pressure above diaphragm = pressure below diaphragm

Diaphragm pressed against main seat by spring + プレッシャー

→ Main air/water path fully closed, no medium flow

3. Energized (Open)
4. Coil energized, pilot spool actuated
5. Pilot orifice opens
6. Pressure above diaphragm releases rapidly
7. Pressure below diaphragm > pressure above diaphragm
8. Diaphragm lifted by pressure differential

→ Main flow path opens, large medium flow passes through

4. 主な特長 (vs Direct-acting 2V025)
5. Minimum operating pressure required

Pilot-operated valves typically need ≥0.05MPa differential to open; cannot operate at low/zero pressure

2. High flow, コンパクトなサイズ

Much higher flow than direct-acting valves in the same body size

3. Low coil power, 長寿命

Coil only opens small orifice, lower heat generation, longer lifespan

4. Unidirectional flow only

Flow arrow marked on body; reverse mounting prohibited (may cause incomplete closing or failure to open)

5. Summary of Principle

AIRTAC 2V Pilot-Operated Solenoid Valve:

Coil opens pilot vent → Pressure differential forms across diaphragm → Main valve lifted for high-flow on/off control.