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AT Series

DELCO AT Series Spring Return Pneumatic Actuator – Fail-Safe Emergency Control

The DELCO AT Spring Return Pneumatic Actuator is the ideal choice for safety-critical applications requiring a guaranteed fail-safe position. Utilizing robust internal springs, this single-acting actuator ensures rapid reset and reliable emergency shut-off or open upon loss of air supply or power, protecting personnel and process equipment. Designed for fast action speed, it operates efficiently within a specified air pressure range (2.5–8 Bar) and is configurable for various temperature extremes, making it essential for hazardous working conditions.

Air Supply Pressure: 2.5 bar to 8 bar

Angle Of Rotation : 0° to 90°
Ambient Temperature: -40 to 160℃

Protection Class: IP65

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Features

A rugged, single-acting pneumatic actuator providing rapid, fail-safe spring return operation for emergency control, featuring a 2.5–8 Bar pressure requirement and precise ±5° end-of-travel adjustment.

✅Fail-Safe Emergency Function: The spring action guarantees the valve returns instantly to its pre-set safety position (Fail-Close or Fail-Open) upon failure of the air supply, critical for hazardous applications.

✅Rapid Action Speed: The single-acting design allows air pressure to act in one direction and the spring to provide rapid force in the return direction, optimizing emergency response time.

✅Specific Pressure Range: Operates reliably between 2.5 Bar and 8 Bar air supply, reflecting the necessary force required to overcome spring compression for secure operation.

✅Versatile Temperature Options: Suitable for standard operation within -20°C to +80°C, with specialized options available to handle low temperatures down to -35°C for extreme environments.

✅Precise Travel Adjustment: Equipped with mechanical stops that allow for fine-tuning of the end-of-travel position with a ±5° adjustment range, ensuring zero leakage on shut-off.

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Product Details

Dimension

Pneumatic valve Actuator Dimension Table

MODEL	A	B	C	D	E	F	G	H	J	K	N	M	L	P	Z	Air Hole
AT52	30	42.5	65.5	72.4	92.5	50.5	30	80	∅36	∅50	M5×8	M6×10	150	42	14	NAMUR G1/4″
AT63	36	47	81	88.5	98.5	69.5	30	80	∅50	∅70	M6×10	M8×13	171	42	18	NAMUR G1/4″
AT75	42.5	53	93	100	120	78	30	80	∅50	∅70	M6×10	M8×13	186	42	18	NAMUR G1/4″
AT83	46.5	57	98.5	109.7	129.5	86	30	80	∅50	∅70	M6×10	M8×13	206	42	21	NAMUR G1/4″
AT92	50	58	106	117	137	90	30	80	∅50	∅70	M6×10	M8×13	265	42	21	NAMUR G1/4″
AT105	57.5	64	122.5	135	155	104.5	30	80	∅70	∅102	M8×13	M10×16	272	42	27	NAMUR G1/4″
At125	67.5	74.5	145.5	157	177	120.5	30	80	∅70	∅102	M8×13	M10×16	304	60	27	NAMUR G1/4″
AT140	75.5	75.5	161	174	194	125	30	80	∅102	∅125	M10×16	M12×20	395	60	32	NAMUR G1/4″
AT160	87	87	184	198	228	143	30	80	∅102	∅125	M10×16	M12×20	462	60	32	NAMUR G1/4″
AT190	103	103	216	232	262	172	30	130	∅102	∅140	M10×16	M16×25	520	85	40	NAMUR G1/4″
AT210	113	113	235.5	257	287	194	30	130	∅102	∅140	M10×16	M16×25	538	85	40	NAMUR G1/4″
AT240	130	130	235.5	292	322	230	30	130		∅165	M20×30		592	90	50	NAMUR G1/4″
AT270	147	147	235.5	331	361	253	30	130		∅165	M20×30		713	90	50	NAMUR G1/2″
AT300	161	168	235.5	354	384	290	30	130	∅165	∅215	M20×30	M20×30	771	90	50	NAMUR G1/2″

Pneumatic valve Actuator Accessories

Air source processor: Combines filtering, pressure reduction, and lubrication functions, ensuring stable outlet pressure. Available in two-piece assemblies for filtering compressed instrument air and three-piece configurations for added lubrication.

Pneumatic solenoid valve: Regulates the opening and closing of pneumatic valves by magnetizing and demagnetizing to direct gas flow based on voltage signals. Offers precise control over valve operations, commonly used for managing gas source and circuit flow.

Limit switch: Detects valve status and outputs signals for open or closed positions. Critical in automatic control systems, confirming and executing subsequent programs, providing valve interlock protection, and indicating remote alarms within the system.

Valve positioner: Crucial for precise control over valve positioning in pneumatic control valves, comparing valve stem displacement and controller output signals, adjusting the actuator output signal accordingly.

Manual device: Complements pneumatic actuator assemblies, facilitating manual or pneumatic operation for butterfly and ball valves with a 90° opening. Ensures versatility and flexibility in valve operation, allowing for manual and automated control as needed.

Pneumatic Valve Actuator Common faults and inspection, troubleshooting

Failure Phenomenon	Inspection Items	Solution
Pneumatic Valve Can Not Move	The electromagnetic valve is normal, Coil is burned, electromagnetic valve is stuck being stolen	Solenoid valve replacement, Replacement coils, remove stolen Property.
	A separate air supply pneumatic Actuator test check seals and Whether the cylinderis damaged.	Replace a bad ring and cylinder.
	There are impurities in the spool Valve stuck.	Remove impurities, replace Damaged parts.
	the handle in a manual hand motor location.	Interchange
Slow Motion, Crawling	Supply pressure is not enough.	The increase of gas supply pressure(0 4 – 0.7mpa)
	Pneumatic actuator outputtorque is Too small.	Increase the pneumatic actuator Production.
	The valve spool or valve assembly too tight.	Re – assembly adjustments.
	Air supply pipe plug, flow is toosmall.	Exclude plug, replace the filter cartridge.
Reply Devices Without Signal	power line short circuit or open circuit.	Maintenance of power lines.
	reply within the cam position is not accurate.	Adjust the cam to the correct location
	Micro switch damaged.	Replacement micro switch