SMC RSDQA20-20BR-J79LS Hydraulic Pneumatic Cylinders

( Brand: Smc ), ( Manufacturer Part Number: RSDQA20-20BR-J79LS ), ( Part Type: Hydraulic Pneumatic Cylinder )

Review SMC Rsdqa2020brj79ls Used

The **SMC RS-DQA20-20BR-J79LS** is a high-performance, compact pneumatic actuator designed for precision control in automated industrial applications, offering exceptional reliability and versatility in demanding environments. Part of SMC s advanced **RS-DQA** series, this double-acting, rotary pneumatic cylinder features a robust **20mm bore diameter** and a **20mm stroke length**, making it ideal for applications requiring compact yet powerful rotational motion. Engineered with a **gear rack mechanism**, this actuator delivers smooth, consistent angular displacement with minimal backlash, ensuring precise positioning and repeatability critical for tasks such as indexing, clamping, or linear-to-rotary conversion in assembly lines, packaging machinery, or material handling systems. The **J79LS** designation indicates a **90-degree rotation** (0 to 90 ) with a **1/4-turn** operation, paired with a **20mm shaft diameter**, which accommodates a range of mounting configurations and load capacities up to **100 Nm** (depending on the specific application and mounting setup). Constructed from high-quality materials, including a **stainless steel housing** for corrosion resistance and a **durable rubber seal system**, this actuator is well-suited for both cleanroom environments and harsh industrial settings where moisture, dust, or temperature fluctuations may be present. The **BR** suffix denotes a **rotary pneumatic cylinder with a built-in brake**, providing enhanced safety by preventing unintended rotation when de-energized, which is particularly valuable in applications where positional stability is non-negotiable. Compatible with SMC s extensive range of pneumatic components, including valves, regulators, and fittings, the RS-DQA20-20BR-J79LS integrates seamlessly into automated systems, offering plug-and-play functionality with minimal setup complexity. Whether deployed in food and beverage processing, automotive assembly, or pharmaceutical manufacturing, this actuator exemplifies SMC s commitment to innovation and engineering excellence, delivering a balance of compact design, high torque output, and operational longevity for industries prioritizing efficiency and precision.

### **Pros and Cons of buying a SMC RS-DQA20-20BR-J79LS (RS-DQA2020BRJ79LS) Air Valve**

#### **Overview**

The **SMC RS-DQA20-20BR-J79LS** is a **2-way, normally closed (NC) pilot-operated air valve** designed for pneumatic control systems. It is commonly used in automation, manufacturing, and industrial applications where precise air flow control is required. Below is a detailed breakdown of its advantages and disadvantages.

---

### **Pros**

1. **High Reliability and Durability**

- Built with **high-quality materials**, including stainless steel and reinforced seals, ensuring long-term performance in harsh industrial environments.

- Designed for **high-pressure applications** (up to **10 bar / 145 psi**), making it suitable for heavy-duty pneumatic systems.

- **Low maintenance** due to robust construction and minimal wear parts.

2. **Precise and Controlled Operation**

- **Pilot-operated mechanism** allows for **smooth, gradual opening and closing**, reducing shock and wear on connected components.

- **Adjustable flow rate** (via internal orifice or external flow control) enables fine-tuning of air delivery for different applications.

- **Bidirectional flow capability** (depending on configuration) allows flexibility in system design.

3. **Compatibility with SMC s Ecosystem**

- **Seamless integration** with other SMC components (e.g., valves, cylinders, regulators), making it ideal for **modular pneumatic systems**.

- **Standardized mounting and wiring** simplify installation and troubleshooting.

- Supports **SMC s digital and analog control interfaces**, including **ProfiBus, Modbus, and IO-Link** (if paired with compatible controllers).

4. **Energy Efficiency**

- **Low leakage** when closed, reducing wasted air and improving system efficiency.

- **Fast response time** minimizes energy loss during frequent cycling.

5. **Versatile Applications**

- Suitable for **clamping, gripping, actuating, and pneumatic conveying** systems.

- Works well in **food & beverage, automotive, packaging, and general industrial automation**.

- Can be used in **cleanroom environments** (with proper sealing) due to its tight construction.

6. **Easy Installation and Maintenance**

- **Quick-connect fittings** (e.g., SMC s **QD or JIS threads**) simplify plumbing.

- **Modular design** allows for easy replacement of internal components (e.g., seals, pilot valves).

- **Clear labeling and documentation** from SMC make troubleshooting straightforward.

7. **Safety Features**

- **Fail-safe operation** (normally closed by default) prevents unintended air release in case of pilot failure.

- **Overload protection** (via pressure relief or internal limits) helps prevent system damage.

8. **Global Availability and Support**

- **Widely distributed** through SMC s extensive dealer network.

- **Technical support and spare parts** are readily available worldwide.

---

### **Cons**

1. **Higher Upfront Cost**

- Compared to **basic solenoid valves or manual valves**, the **RS-DQA20 series** is more expensive due to its **pilot-operated, high-precision design**.

- Additional costs may arise from **specialized fittings, wiring, or control interfaces** if not already integrated.

2. **Complexity in Wiring and Control**

- Requires **proper pilot signal wiring** (e.g., 24V DC or pneumatic pilot air), which may need additional components (e.g., a **pilot valve or solenoid valve**).

- **Not plug-and-play** requires **system integration knowledge**, especially for digital control applications.

- **Potential for pilot air leaks** if not properly sealed, leading to inefficiency.

3. **Limited Flow Rate for Small Systems**

- The **20 mm (0.79 in) port size** may be **too large** for very small pneumatic applications, leading to **excessive air consumption**.

- For **low-flow applications**, a smaller valve (e.g., **RS-DQA10**) might be more cost-effective.

4. **Sensitivity to Contaminants**

- While durable, **particle contamination** (e.g., oil, dust) can **reduce valve lifespan** if not filtered properly.

- Requires **proper air filtration** (e.g., **SMC s FRL units**) to maintain performance.

5. **Potential for Pilot Valve Failure**

- The **pilot mechanism** (internal or external) can **wear out over time**, especially in **high-cycle applications**.

- Requires **periodic inspection and potential replacement** of pilot components.

6. **Not Ideal for Extreme Environments**

- While robust, **extreme temperatures (below -10 C / 14 F or above 80 C / 176 F)** may affect performance unless specified variants are used.

- **High humidity or corrosive environments** may require **additional sealing or coatings**.

7. **Learning Curve for Non-Experts**

- **Not beginner-friendly** requires understanding of **pneumatic control logic, pilot signals, and system pressure dynamics**.

- Misconfiguration (e.g., wrong pilot voltage, improper wiring) can lead to **system malfunctions**.

8. **Limited Customization Options**

- While versatile, **not all configurations** (e.g., special materials, non-standard ports) are available off-the-shelf.

- May require **custom modifications**, increasing lead time and cost.

---

### **Conclusion**

The **SMC RS-DQA20-20BR-J79LS** is a **high-performance, reliable, and precise** air valve well-suited for **industrial automation, heavy-duty pneumatic systems, and applications requiring controlled airflow**. Its **durability, integration capabilities, and efficiency** make it a strong choice for **medium to large-scale applications** where **consistency and longevity** are critical.

However, its **higher cost, complexity in setup, and sensitivity to system conditions** may make it **overkill for simple or low-budget applications**. It is best suited for **experienced engineers or companies with existing SMC systems** who can **optimize its use with proper pilot control, filtration, and maintenance**.

For **small-scale, low-cost, or non-critical applications**, a **simpler solenoid valve or manual valve** may be more appropriate. Conversely, for **high-precision, high-reliability, or large industrial setups**, the **RS-DQA20 series is an excellent investment**.

---

### **Final Recommendation**

You are working on a **pneumatic system requiring precise, controlled airflow** (e.g., clamping, actuating, or conveying).

You already have **SMC components** and need **seamless integration** with your existing setup.

Your application involves **high pressure (up to 10 bar) and frequent cycling** without frequent failures.

You have **technical expertise** in **pilot control, wiring, and pneumatic system design**.

**Long-term reliability and low maintenance** are priorities.

You need a **low-cost, simple solution** opt for a **basic solenoid valve** instead.

Your system has **very low airflow requirements** a **smaller valve (e.g., RS-DQA10)** may suffice.

You lack **experience with pilot-operated valves** consult an **automation specialist** before installation.

Your environment has **extreme contaminants or temperatures** ensure proper **filtration and environmental controls** are in place.

- Use with **SMC s FRL (Filter-Regulator-Lubricator) unit** to ensure clean, pressurized air.

- Pair with a **compatible pilot valve or solenoid** for reliable actuation.

- Follow **SMC s maintenance guidelines** (e.g., periodic seal checks, pilot valve inspection).

- Consider **digital control interfaces** (e.g., **ProfiBus, IO-Link**) if integrating with **Industry 4.0 systems**.

In summary, the **RS-DQA20-20BR-J79LS is a premium choice for professional pneumatic applications** where **performance and reliability** justify the investment. For less demanding setups, alternatives may offer better cost efficiency.

Details:

Call to use a shipping service other than the ones listed. SMC RSDQA20-20BR-J79LS / RSDQA2020BRJ79LS USED STOPPER CYLINDER, RSQ SERIES, DOUBLE ACTING, 20MM BORE, STROKE. Sells new and surplus product develops channels to purchase such. All products are guaranteed to be working but may show signs of use if purchasing a used product.

Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection.

part #: rsdqa2020brj79ls price

• $60.02

specifications hydraulicylind:

• brand: Smc
• mpn: Rsdqa20-20br-j79ls
• part type: Hydraulic Pneumatic Cylinder

seller hydraulicylind:

• rating: 99.6%
• city: 1 Millennium Dr, Willingboro, NJ 08046
• # reviews: 196438

shipping hydraulicylind:

• class: Standard
• transit: 24-36 Days
• cost: $12.90
• service: Standard
• type: Fixed

general hydraulicylind:

• condition: Used
• Business Industrial > Hydraulics, Pneumatics, Pumps Plumbing > Hydraulic Pneumatic Cylinders

returns hydraulicylind:

• paid by: Buyer
• method: Money back
• policy: Returns Accepted
• time: 30 Days

payments hydraulicylind:

• wallet: Paypal
• credit card: Diners-club
• other

offer hydraulicylind:

• sold: 0
• started: March 27, 2026
• quantity: 1
• options: Ship-to-home
• availability: In Stock

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