ASCO G551A118, 5/2 Bistable Spool Valve - Pneumatic G 1/4 551 Series
G551A118
The ASCO G551A118 is a Series 551 5/2 pneumatic spool valve with G 1/4 ports and bistable operation. It is operated by an air pilot signal rather than an electrical coil, making it suitable for pneumatic control systems where electrical actuation at the valve is not required. Genuine ASCO stock is supplied by General Tech Services LLC, UAE, with free UAE-wide shipping. Request a quote in under a minute - call +971 6 543 6933.
The ASCO G551A118 provides 5/2 directional control with one supply, two outlets and two exhausts, making it suitable for driving double-acting cylinders in both directions. Its pneumatic pilot operation keeps electrical coils away from the valve, which can be useful in applications where electrical equipment at the valve location is unwanted.
The valve uses bistable actuation and switches through a pneumatic pilot signal. Typical applications include automated machines with double-acting cylinders, pneumatic control systems and like-for-like replacement of an ASCO Series 551 valve. When selecting a directional control valve, confirm the function, actuation and return type, port size and control requirements. For replacement applications, providing the existing valve part number helps confirm the correct variant.
Ready to order the ASCO G551A118? Speak to our team. Call +971 6 543 6933
Key Benefits
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5/2 directional valve function
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G 1/4 ports
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Air-piloted operation with no electrical coil at the valve
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Bistable actuation
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Suitable for double-acting pneumatic cylinders
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Genuine ASCO (Emerson) product and specification
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Free UAE-wide shipping on genuine ASCO stock
Who This Product Is Best For
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Double-acting cylinders on automated machines
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Pneumatic control systems using air pilot signals
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Applications where electrical actuation at the valve is unwanted
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Maintenance teams replacing a like-for-like ASCO Series 551 valve
How to Install & Use It
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Confirm that the valve function, bistable operation and G 1/4 port configuration match your pneumatic circuit.
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Mount the valve and connect the supply, outlet and exhaust ports according to the markings.
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Connect the pneumatic pilot signal line to the designated pilot port.
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Check the pilot signal and air connections for correct operation.
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Test switching with the actuator unloaded.
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After confirming correct operation, test the system under working pressure.
Frequently Asked Questions
What does the ASCO G551A118 do?
It is a 5/2 pneumatic spool valve designed to switch compressed air and control double-acting pneumatic actuators such as cylinders in both directions.
What does 5/2 mean?
5/2 means five ports and two switching positions: one supply, two outlet ports and two exhaust ports.
Does the ASCO G551A118 require an electrical coil?
No. It is air-piloted and uses a pneumatic pilot signal instead of an electrical coil at the valve.
What are the port size and actuation type?
The valve has G 1/4 ports and bistable actuation.
What air quality does it need?
Use clean, dry, filtered compressed air. Appropriate air preparation helps protect pneumatic components and maintain consistent switching.
How should I choose this valve or another Series 551 option?
Choose the valve based on function, actuation and return type, port size, control method and application requirements. For replacement applications, provide the existing valve part number to General Tech Services LLC for compatibility confirmation.
What is the difference between the G551A118 and ASCO SCG551A017MS-48?
The G551A118 is an air-piloted, bistable 5/2 pneumatic spool valve with G 1/4 ports, while the SCG551A017MS-48 uses a 48 V 50/60 Hz electrical coil. Select based on the required control method, function, port size and application requirements.
Can you supply matching ASCO parts in the same order?
Yes. General Tech Services LLC can supply ASCO pneumatic components such as solenoid and spool valves, shut-off valves, silencers, filters, regulators, cylinders and position detectors. Share your application requirements for a matching quotation.
Is genuine ASCO stock available in the UAE?
General Tech Services supplies original ASCO pneumatic valves in the UAE with technical support and free UAE-wide shipping.
What details should I send with a quote request?
Provide the part or model number, required quantity and application details such as pressure, flow, equipment type and operating environment. This helps confirm the correct ASCO variant.
What is the price of the ASCO G551A118?
Pricing is quote-based. Call General Tech Services LLC on +971 6 543 6933 or submit the Request a Quote form.
For pricing or to place an order, contact General Tech Services LLC. Call +971 6 543 6933.
