SOLENOID VALVES Single Solenoid 3/2 Way 1/8″ Valve to Double Solenoid 5/3 Way 1/2″ Centre Exhaust

✅ 1. Single Solenoid 3/2 Way 1/8″ Valve

🔧 Description:

A 3/2 way single solenoid valve is a pneumatic directional control valve with three ports and two positions, actuated by a single solenoid and spring return mechanism.

📌 Key Specifications:

• Type: 3/2-way valve

• Actuation: Single solenoid with spring return

• Port Size: 1/8″ BSP or NPT (depending on standard)

• Function: Used to control the flow of air to single-acting actuators (like cylinders) or as a pilot valve.

• Ports:

  • Port 1 (P): Pressure inlet

  • Port 2 (A): Outlet to actuator

  • Port 3 (R or E): Exhaust

🧩 Working Principle:

• De-energized (default state): Spring holds the spool in position; air is blocked from the outlet and the actuator port is exhausted.

• Energized: Solenoid shifts the spool to allow compressed air to flow from the pressure port to the actuator port.

💡 Typical Applications:

• Single-acting pneumatic cylinders

• Pilot control for larger valves

• Emergency air blow-off or fail-safe mechanisms

✅ 2. Double Solenoid 5/3 Way 1/2″ Valve – Centre Exhaust

🔧 Description:

A 5/3 way double solenoid valve with center exhaust is a pneumatic directional valve with five ports and three positions, operated by two solenoids without spring return. The centre position is configured to exhaust all actuator ports, ensuring no pressure remains in the system.

📌 Key Specifications:

• Type: 5/3-way valve

• Actuation: Double solenoid, no spring return (latching)

• Center Position: All ports exhausted (centre exhaust)

• Port Size: 1/2″ BSP or NPT (depending on standard)

• Ports:

  • Port 1 (P): Pressure inlet

  • Ports 2 (A) & 4 (B): Cylinder ports

  • Ports 3 (R1) & 5 (R2): Exhaust ports

🧩 Working Principle:

• Left Solenoid Energized: Pressure flows to Port A, Port B is exhausted.

• Right Solenoid Energized: Pressure flows to Port B, Port A is exhausted.

• Both Solenoids De-energized (center position): All actuator ports (A & B) are exhausted via R1 and R2; no pressure is applied.