Product Overview
The SMC AR40K-04 is a precision pneumatic pressure regulator from the SMC AR series, engineered to deliver stable, repeatable downstream pressure control in compressed air systems. As a process and pneumatic valve component, it operates on a force-balance diaphragm principle: an adjusting knob compresses a control spring, which acts against a diaphragm to modulate the internal valve poppet, maintaining the set outlet pressure regardless of fluctuations in inlet pressure or flow demand. The AR40K-04 features a 1/2″ port size and is configured with a bracket-mounted body for panel or wall installation. Its relieving (self-relieving) design automatically exhausts excess downstream pressure when the setpoint is reduced, protecting actuators and instrumentation. This regulator is a direct-fit replacement for OEM SMC assemblies and is widely deployed in factory automation, packaging machinery, and general industrial pneumatic circuits where precise pressure regulation is critical to process consistency and equipment longevity.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pneumatic Pressure Regulator (Process & Pneumatic Valve) |
| Model Designation | AR40K-04 |
| Series | SMC AR Series |
| Port Size | 1/2″ (Rc/PT thread) |
| Operating Pressure | Standard Industrial Grade (Up to rated bar) |
| Mounting & Connection | Bracket Mount / Standard ISO Threaded Interface |
| Adjustment Type | Manual Knob with Locking Nut |
| Relieving Function | Self-Relieving (Automatic Downstream Exhaust) |
Engineering Features & Advantages
- Precision Pressure Control: Diaphragm-actuated force-balance design delivers stable outlet pressure with minimal deviation, ensuring consistent actuator and instrument performance across varying flow demands.
- Self-Relieving Design: Automatically vents excess downstream pressure when the setpoint is reduced, preventing trapped pressure hazards and protecting sensitive pneumatic components.
- Industrial Reliability: Built for continuous operation under severe industrial conditions with robust internal poppet and diaphragm construction rated for demanding factory environments.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original OEM SMC AR40K-04 standards, ensuring drop-in installation without modification.
- Lockable Adjustment: Integrated locking nut secures the pressure setpoint against vibration-induced drift, maintaining process repeatability over extended duty cycles.
Typical Industrial Applications
Commonly deployed in plastic injection molding machines for mold clamping and ejection circuit pressure control, packaging and labeling machinery for consistent actuator force, CNC machine tools and factory automation lines for tooling and gripper pressure regulation, and general industrial pneumatic systems including metallurgical handling equipment and marine pneumatic controls where reliable, repeatable air pressure regulation is essential to process quality and equipment protection.
PRODUCT IMAGES
SMC AR40K-04 Pneumatic Regulator
⚡ Emergency Plant Maintenance & Ready-to-Ship Notice:
- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
- Fast Dispatch: In-stock units ready for same-day dispatch via DHL / FedEx Express directly to your plant.
- Pre-Shipment Verification: High-definition photos, video testing runs, and serial number verification provided prior to shipment.
- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine SMC AR40K-04 Modular Regulator Valve. This Japan-made pneumatic component features a reliable pressure regulation design, delivering precise air flow control for heavy-duty industrial automation systems.