Product Overview
The SMC AR30K-03H 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 diaphragm-actuated, spring-loaded pilot mechanism that continuously senses outlet pressure and modulates the internal valve seat to maintain the setpoint regardless of fluctuations in inlet pressure or flow demand. The AR30K-03H features a 3/8″ port size with a knob-adjustable set pressure and is designed for panel or bracket mounting within industrial pneumatic circuits. Its balanced poppet design minimizes pressure droop and ensures accurate regulation across the full operating range, making it a reliable choice for machine builders, automation integrators, and maintenance operations requiring precise air pressure management.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Pneumatic Pressure Regulator (Process & Pneumatic Valve) |
| Model Designation | AR30K-03H |
| Series | SMC AR Series |
| Port Size | 3/8″ (03) |
| Thread Type | Rc (PT) Taper Thread |
| Operating Pressure | Standard Industrial Grade (Up to rated bar) |
| Adjustment Method | Knob-Adjustable with Locking Nut |
| Mounting & Connection | Standard ISO / Manufacturer Interface (Bracket or Panel Mount) |
| Body Material | Die-Cast Zinc / Aluminum Alloy |
| Seal Material | NBR (Nitrile Rubber) |
Engineering Features & Advantages
- Precision Pressure Regulation: Balanced poppet and diaphragm design delivers accurate, repeatable outlet pressure control with minimal droop across varying flow rates.
- Knob-Adjustable Setpoint: Ergonomic adjustment knob with locking mechanism allows quick, tool-free pressure setting and secure retention under vibration.
- Compact Modular Design: Space-efficient body integrates seamlessly with SMC modular FRL units and manifold configurations for streamlined pneumatic panel layouts.
- Industrial Reliability: Built for continuous operation under severe industrial conditions with robust die-cast body and durable NBR seals.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original OEM standards for drop-in serviceability.
PRODUCT IMAGES

SMC AR30K-03H 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 AR30K-03H Modular Regulator Valve. This Japan-made pneumatic component features a precision pressure regulation design, delivering reliable and consistent air flow control for industrial automation systems.