Description
1/4"–1/2" BSP 316 Stainless Steel 5/2 Double Solenoid Valve
The Shako SPU520D Series is a corrosion-resistant 5/2 way double-solenoid pneumatic directional control valve designed for reliable operation in industrial compressed air systems.
Featuring a SUS316 stainless steel body, internally piloted spool mechanism and two electrically operated solenoids, the SPU520D provides dependable directional control for double-acting pneumatic cylinders, actuators and automated machinery.
Available in 1/4", 3/8" and 1/2" BSP threaded connections, the SPU520D combines robust stainless steel construction with bistable switching operation. Unlike spring-return pneumatic valves, the double-solenoid design retains its last selected spool position when both coils are de-energised under normal operating conditions.
The SPU520D is particularly suitable for industrial automation, process equipment and pneumatic control systems where corrosion resistance and electrically controlled switching in both directions are required.
5/2 Way Double-Solenoid Operation
The SPU520D is a five-port, two-position directional control valve with two solenoids controlling an internally piloted spool.
Energise Solenoid A → The spool shifts to one position, directing compressed air to one actuator port while exhausting the other.
Energise Solenoid B → The spool shifts to the opposite position, reversing the compressed air supply and exhaust connections.
Both Solenoids OFF → The spool normally remains in its last selected position, provided the pneumatic operating conditions are maintained.
This bistable arrangement allows a PLC or other electrical controller to select either valve position without requiring a mechanical spring return.
The valve should not be treated as a guaranteed actuator-position holding or safety device, as cylinder movement following air or electrical supply loss depends on the complete pneumatic circuit.
Port Sizes & Pneumatic Connections
The SPU520D Series is available in three BSP threaded sizes:
- 1/4" BSP – SPU520-02D
- 3/8" BSP – SPU520-03D
- 1/2" BSP – SPU520-04D
Optional NPT threaded versions are available upon request.
The manufacturer identifies five pneumatic connections: one pressure supply, two actuator connections and two exhaust ports.
For the 1/2" version, the exhaust connections are 3/8", rather than 1/2".
Pressure & Operating Conditions
The SPU520D is designed for industrial compressed air systems operating within the following limits:
- Operating Pressure: 1.5–8 kgf/cm² (approximately 1.47–7.85 bar)
- Proof Pressure: 9.99 kgf/cm²
- Ambient Temperature: -10°C to +60°C
- Operating Medium: Compressed air
- Pilot Operation: Internal pilot
- Switching Arrangement: Double solenoid
Sufficient compressed air pressure must be maintained for reliable pilot operation.
SUS316 Stainless Steel Construction
The SPU520D features a durable SUS316 stainless steel valve body, offering improved corrosion resistance compared with conventional aluminium pneumatic directional control valves.
The manufacturer's exploded drawing identifies the internal spool, pilot piston, O-rings, end plates and solenoid assemblies.
The stainless steel body makes the SPU520D suitable for demanding industrial environments where corrosion resistance is important.
Compatibility of internal seals and other components should be confirmed for particularly aggressive operating environments.
Electrical Coil & Voltage Options
The SPU520D uses two solenoid coils to control the valve's switching positions.
Standard supply voltages:
Other voltages may be available upon request.
Electrical characteristics:
- Voltage Tolerance: ±10%
- Duty Rating: 100% continuous
- Coil Insulation: Class F
- Ingress Protection: IP65
- Standard Electrical Connection: DIN type
- Optional LED Indication: Available
The two-solenoid arrangement is suitable for integration with PLC outputs, pneumatic control panels and industrial automation systems.
Optional Explosion-Protected Coils
The SPU520 Series is available with optional explosion-protected solenoid coil configurations for specialist hazardous-area applications.
The manufacturer lists alternative explosion-protected coil options, including 22mm and 30mm coil widths.
The applicable ATEX/IECEx certification, temperature class, hazardous-area classification and permitted installation conditions must be confirmed for the selected coil and complete valve assembly.
Installation & Pneumatic Control
The SPU520D should be installed in a suitable compressed air system with correctly identified supply, actuator and exhaust connections.
The valve requires an internal pilot pressure supply within the manufacturer's specified operating range.
For reliable control, the electrical system should be designed to energise the appropriate solenoid for the required switching direction. Simultaneous energisation of both solenoids should be avoided unless specifically permitted by the manufacturer.
Typical Applications
- Double-acting pneumatic cylinder control
- Pneumatic actuator directional switching
- Industrial process automation
- Corrosion-resistant pneumatic systems
- PLC-controlled pneumatic machinery
- Food and beverage processing equipment
- Water treatment machinery
- Packaging and production equipment
- OEM pneumatic control systems
- Industrial compressed air installations
Technical Specification
Manufacturer: Shako Co Ltd
Series: SPU520D
Valve Type: 5/2 way pneumatic directional valve
Solenoid Configuration: Double solenoid
Switching Arrangement: Bistable
Pilot Operation: Internal pilot
Body Material: SUS316 stainless steel
Port Sizes: 1/4", 3/8" and 1/2" BSP
Optional Threads: NPT
Operating Medium: Compressed air
Operating Pressure: 1.5–8 kgf/cm²
Proof Pressure: 9.99 kgf/cm²
Ambient Temperature: -10°C to +60°C
Standard Voltages: 24V DC, 110V AC, 220V AC
Voltage Tolerance: ±10%
Duty Rating: 100% continuous
Insulation Class: F
Ingress Protection: IP65
Electrical Connection: DIN type
Optional Features: LED indicator, explosion-protected coils
Approximate Weight: 1.2kg
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