ASCO 551 (553) Solenoid Spool Valve, Pilot Operated, 3/2 NC & 5/2, Aluminium & Brass
ASCO 551 (553) pilot-operated spool valve, 3/2 NC or 5/2, single or dual solenoid, aluminium or brass body, 1/4″ and 1/2″ ports, NAMUR option. 100% genuine, factory-direct, quote within 12 hours.
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The ASCO 551 (553) is a pilot-operated spool valve for pneumatic cylinder control. Available in 3/2 NC and 5/2 functions with single (spring return) or dual (bistable) solenoid operation, it drives single- and double-acting actuators across packaging, automation and process applications. Aluminium or brass bodies, with tapped and NAMUR interface versions.
Key Features
- Pilot-operated spool valve, 3/2 NC or 5/2 function — controls single- and double-acting actuators
- Single solenoid (spring return) or dual solenoid (bistable) operation
- Aluminium or brass body, 1/4″ (551) and 1/2″ (553) tapped ports, plus NAMUR interface versions
- High flow — 1/4″ up to 860 l/min, 1/2″ up to 3800 l/min (at 6 bar)
- Power levels BP / LP / ULP to match the application
- Optional manual operator (MO), exhaust protector and ATEX/IECEx pilot options
Specifications
| Valve Type | Pilot-operated spool valve (3/2 NC, 5/2) |
| Function | Single solenoid (monostable) or dual solenoid (bistable) |
| Port Size | 1/4″ (Series 551) and 1/2″ (Series 553), tapped or NAMUR |
| Body Material | Aluminium or Brass |
| Pressure Range | 2 – 10 bar (pilot operated) |
| Flow (Qv at 6 bar) | 1/4″ = 860 l/min · 1/2″ = 3800 l/min |
| Orifice / Kv | 6 mm / 0.75 m³/h (1/4″) · 13 mm / 3.15 m³/h (1/2″) |
| Media / Fluids | Air, inert gas (filtered, lubricated or non-lubricated) |
| Power Levels | BP (basic), LP (low), ULP (ultra-low) |
Typical Applications
- Pneumatic cylinder and actuator control — single- and double-acting
- Packaging and automation machinery — cylinder sequencing and reversal
- Process industry — NAMUR piloting of quarter-turn actuators
- General industrial pneumatic control
Factory-Direct Price & Fast Shipping
We supply ASCO 551/553 spool valves factory-direct at competitive bulk pricing. Aluminium and brass bodies, 3/2 NC and 5/2, single and dual solenoid, held in stock and shipped worldwide via DHL/FedEx within 48 hours; every unit is 100% genuine. Send your function, body material, port size and voltage for a quote within 12 hours.
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Email: sales@gt-exim.com | WhatsApp: +86 17719526488
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