Product Description:
The SMC AR425 to AR935 series represents a line of internally pilot-operated, relieving-type air pressure regulators specifically engineered for demanding industrial compressed-air systems. These regulators are ideal in applications where maintaining a stable outlet pressure alongside a high flow capacity is crucial. Unlike conventional direct-acting regulators, this series employs a pilot mechanism that utilizes the supply air itself to control the main valve. This design ensures enhanced pressure regulation accuracy, smoother flow characteristics, and significantly reduced fluctuations in outlet pressure even when the inlet pressure changes.
This product range includes 12 popular part numbers, categorized into four sub-series: AR625, AR635, AR825, and AR835. The port sizes for these models vary from Rc 3/4" to Rc 1-1/2". Additionally, customers can choose between two pressure ranges to suit different application requirements: 0.05 to 0.83 MPa, known as the 25 type, and 0.02 to 0.2 MPa, referred to as the 35 low-pressure type. Some units designated with a "G" suffix come equipped with a panel pressure gauge, while an optional B25P mounting bracket is also available for added installation flexibility.
These regulators are extensively utilized across a wide array of industries and settings. Common applications include compressor stations, centralized compressed-air lines, automated production lines, pneumatic manipulators, and OEM machine assemblies. Their robust design and reliable performance make them an essential component for efficient and stable compressed-air distribution in heavy-duty industrial environments.
Features:
The pilot-operated design of this regulator ensures a much more stable outlet pressure compared to direct-acting regulators. It remains largely unaffected by fluctuations in the inlet pressure, providing consistent performance even under varying conditions.
Featuring an internal relieving mechanism, the regulator automatically vents any excess outlet pressure to the atmosphere. This function helps maintain a steady downstream line pressure, enhancing system reliability and safety.
Constructed with a die-cast aluminum body, the regulator is equipped with a protected bonnet and chamber. This design not only reduces weight but also offers excellent heat dissipation, making it well-suited for demanding factory floor environments.
Two adjustable pressure ranges are available to meet different application needs: 0.05 to 0.83 MPa for general use, and a low-pressure precision type ranging from 0.02 to 0.2 MPa. This versatility allows for precise control in various operational settings.
The regulator comes with multiple port size options including 3/4", 1", 1-1/4", and 1-1/2". Additionally, thread types such as Rc (PTF), NPT (F), and G threads are available upon request to accommodate different piping standards.
For enhanced usability, an optional pressure gauge (denoted by the G suffix and part of the G46 series) and a mounting bracket (B25P) can be provided. These accessories offer clear, local pressure read-outs and facilitate easy retrofitting of the device.
To prevent unintended adjustments and pressure fluctuations after the initial setting, a locking screw is integrated into the adjusting handle. This feature ensures stable and reliable pressure control throughout operation.
Technical Parameters:
| Item |
AR625 / AR825 (High Range) |
AR635 / AR835 (Low Range) |
| Fluid |
Air |
Air |
| Max. operating pressure |
1.0 MPa |
1.0 MPa |
| Proof pressure |
1.5 MPa |
1.5 MPa |
| Set pressure range |
0.05 to 0.83 MPa |
0.02 to 0.2 MPa |
| Construction |
Internal pilot operated, relieving type (pilot air always bleeding) |
Same |
| Ambient / fluid temperature |
-5 to 60°C (no freezing) |
-5 to 60°C (no freezing) |
| Pressure gauge port |
1/4" |
1/4" |
| Air consumption (relief hole) |
5 L/min (ANR) at max. pressure |
5 L/min (ANR) at max. pressure |
| Body material |
Die-cast aluminum |
Die-cast aluminum |
| Adjusting / valve spring |
Steel wire 1 / Stainless steel |
Steel wire 1 / Stainless steel |
| Handle material |
ABS |
ABS |
| Weight — AR625/635 |
1.1 kg |
1.1 kg |
| Weight — AR825/835 |
2.5 kg |
2.5 kg |
Applications:
Air compressor stations and central FRL (filter–regulator–lubricator) units play a crucial role in maintaining the quality and consistency of compressed air supply. These central units ensure that air is properly filtered, regulated, and lubricated before distribution.
Branch pressure regulation is essential on automated assembly, packaging, and conveying lines. It ensures that each branch receives the correct pressure needed for optimal operation, enhancing the efficiency and reliability of the production process.
Pneumatic actuators, such as air cylinders, grippers, pneumatic chucks, and vacuum generators, are widely used across various industrial applications. These components provide precise motion control and gripping capabilities necessary for automation.
Applications extend to machine tools, welding booths, spray painting stations, air blow-off points, and purging locations. In each case, controlled compressed air contributes to improved operational performance and product quality.
OEM machines in industries including food and beverage, textile, electronics, semiconductor, and packaging rely heavily on pneumatic systems. These machines benefit from the versatility and efficiency of customized pneumatic solutions tailored to specific industrial needs.
Furthermore, secondary pressure reduction and precision control on high-flow centralized air mains allow for fine-tuning of air pressure at various points in the system. This enables better control and energy savings in demanding industrial environments.
Support and Services:
SMC provides comprehensive technical support and services for our Solenoid Valves to ensure optimal performance and customer satisfaction. Our support includes detailed product documentation, installation guides, troubleshooting tips, and maintenance instructions to help you get the most from your solenoid valves.
We offer expert advice and application support from our experienced engineers who can assist with valve selection, system design, and customization to meet specific requirements. Our team is dedicated to helping you solve any technical challenges and improve your system efficiency.
In addition, SMC provides repair and maintenance services to extend the lifespan of your solenoid valves. We ensure that all repairs are carried out using genuine parts and adhere to strict quality standards.
For further assistance, we recommend consulting our online resources, including FAQs, technical bulletins, and software tools designed to support your engineering needs.
Packing and Shipping:
Each SMC Solenoid Valve is carefully packaged to ensure maximum protection during transit. The valves are individually placed in anti-static bags and cushioned with foam inserts inside sturdy cardboard boxes. This packaging method prevents any damage from shocks, vibrations, or external impacts.
For bulk orders, multiple units are securely packed in larger cartons with adequate padding to avoid movement and potential damage. All packages are clearly labeled with product details, handling instructions, and shipping information to facilitate smooth logistics.
Shipping is conducted through reliable carriers with options for expedited or standard delivery based on customer requirements. We also provide tracking information and support to ensure timely and safe arrival of the SMC Solenoid Valves to your location.
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