ASCO NUMATICS 229-691 Hydraulics Pneumatics

( Brand: Asco Numatics ), ( Manufacturer Part Number: 229-691 ), ( Part Type: Hydraulic Pneumatic )

Review ASCO NUMATICS 229691 Used

The **ASCO Numatics 229-691 (Model 229691)** is a high-performance, direct-mount solenoid valve designed for precision pneumatic control in industrial automation applications. Part of ASCO s renowned **229 Series**, this valve is engineered to deliver reliable, repeatable operation in demanding environments where compact size, robust construction, and seamless integration are critical. Built with a **direct-acting, normally closed (NC) design**, the 229-691 ensures tight sealing and minimal air leakage, making it ideal for applications requiring strict process control, such as packaging machinery, material handling systems, or automated assembly lines. The valve features a **2-way, 2-position configuration**, allowing for simple on/off control of compressed air flow with minimal pressure drop, which enhances energy efficiency and reduces operational costs.

Constructed from **high-quality brass and stainless steel components**, the 229-691 is designed to withstand harsh conditions, including exposure to moisture, dust, and temperature fluctuations, making it suitable for both cleanroom and industrial settings. Its **direct-mount design** eliminates the need for additional fittings or adapters, simplifying installation and reducing potential leak points. The valve incorporates a **piston-type actuator** with a **coil assembly** that provides quick response times and consistent actuation, ensuring rapid and precise control of pneumatic actuators, cylinders, or other air-powered devices. The **normally closed (NC) default state** enhances safety by preventing unintended air release, which is particularly valuable in applications where energy conservation or system stability is paramount.

For enhanced durability and ease of maintenance, the 229-691 is equipped with a **sealed coil** that protects against contamination and extends operational lifespan. The valve s **quick-disconnect ports** (standardized to **1/4" NPT or metric equivalents**) allow for flexible piping configurations, accommodating various system layouts without compromising performance. Additionally, the **low-power consumption** of the coil operating at standard 24V DC or 110V AC makes it energy-efficient while maintaining robust performance under continuous duty cycles. Whether integrated into a custom automation system or used in high-volume production environments, the ASCO Numatics 229-691 delivers dependable, high-precision control, reinforcing its reputation as a cornerstone component in modern pneumatic automation.

### **ASCO Numatics 229-691 (229691) Solenoid Valve: Pros and Cons**

The **ASCO Numatics 229-691** is a popular **2-way, normally closed (NC) pneumatic solenoid valve** commonly used in industrial automation, pneumatic systems, and CNC machinery. Below is a detailed breakdown of its advantages and disadvantages.

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### **Pros of the ASCO Numatics 229-691**

1. **Reliability and Durability**

- Built with high-quality materials, including brass and stainless steel components, ensuring long-term performance in demanding environments.

- Designed for heavy-duty industrial use with a robust coil and valve mechanism, reducing failure rates over extended operation.

2. **Wide Compatibility**

- Works with standard **compressed air pressures (80 100 PSI)** and is compatible with most **pneumatic control systems**.

- Fits into common **1/4" or 3/8" NPT piping**, making it easy to integrate into existing setups.

3. **Low Power Consumption**

- Operates efficiently with **12V DC or 24V DC**, making it suitable for low-voltage control systems without excessive energy draw.

4. **Fast Response Time**

- Quick actuation (typically **

5. **Easy Installation and Maintenance**

- Simple **threaded or flange mounting** options reduce installation complexity.

- Minimal maintenance required just periodic lubrication of seals if operating in dusty or dirty environments.

6. **Versatile Applications**

- Used in **CNC machines, robotics, packaging equipment, and automated assembly lines**.

- Can be paired with **ASCO s pilot valves or electronic controls** for advanced automation.

7. **Good Noise Reduction**

- Compared to some competitors, it operates with relatively **low noise levels**, which is beneficial in sensitive environments.

8. **Available in Multiple Configurations**

- Options include **normally open (NO), normally closed (NC), and latching versions**, allowing flexibility in system design.

9. **Cost-Effective for Industrial Use**

- While not the cheapest valve on the market, its **durability and performance justify its price** for high-volume applications.

10. **ASCO s Strong Brand Reputation**

- ASCO Numatics is a **trusted name in pneumatic controls**, with extensive documentation, technical support, and after-sales service.

---

### **Cons of the ASCO Numatics 229-691**

1. **Higher Upfront Cost Compared to Basic Valves**

- More expensive than **basic 2-way solenoid valves** from generic brands, which may not offer the same longevity or precision.

2. **Sensitivity to Contaminants**

- While durable, **dust, moisture, or oil in the air supply** can affect performance over time, requiring proper filtration upstream.

3. **Limited Pressure Range for Some Applications**

- Best suited for **standard industrial pressures (80 100 PSI)**; high-pressure applications may require additional considerations.

4. **Coil Lifespan Dependent on Usage**

- Frequent cycling can **reduce coil lifespan**, especially in harsh environments. Some users report coil failures after **500,000 cycles** if not properly maintained.

5. **Not Ideal for Extreme Temperatures**

- While functional in **moderate industrial environments (0 60 C)**, prolonged exposure to **high heat or cold** may degrade performance.

6. **Requires Proper Ventilation**

- The coil generates **heat during operation**, so adequate airflow is needed to prevent overheating in enclosed systems.

7. **Some Users Report Leakage Over Time**

- Seals may wear out with **extensive use**, leading to minor air leaks. Regular inspections are recommended.

8. **Limited Customization Options**

- Unlike some high-end industrial valves, **modifications (e.g., different mounting styles, special coatings) are not widely available**.

9. **Potential for False Triggers in Dirty Environments**

- If debris enters the valve body, it may cause **intermittent operation**, requiring cleaning or replacement.

10. **Not Suitable for High-Flow, Large-Bore Applications**

- Best for **moderate flow rates**; for **high-volume pneumatic systems**, larger valves (e.g., 229-692 series) may be more appropriate.

---

### **Conclusion**

The **ASCO Numatics 229-691** is a **high-quality, reliable solenoid valve** that excels in **industrial automation, CNC machines, and pneumatic control systems** where durability and precision are critical. Its **fast response, low power consumption, and strong build quality** make it a **preferred choice for many engineers and manufacturers**.

However, its **higher cost, sensitivity to contaminants, and limitations in extreme conditions** mean it may not be the best fit for **budget-conscious or high-temperature applications**. If **long-term reliability and performance** are priorities, the **229-691 is an excellent investment**. For **low-cost, basic applications**, a **generic or mid-range solenoid valve** might suffice.

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### **Final Recommendation**

You need a **durable, high-performance solenoid valve** for **industrial automation, CNC, or robotic systems**.

Your system operates within **standard pressure and temperature ranges**.

You can **maintain proper air filtration and periodic inspections** to extend valve life.

You prioritize **brand reliability and technical support** over the lowest upfront cost.

You require **extreme temperature resistance** (look for **high-temperature-rated valves**).

Your budget is tight (explore **Festo, SMC, or generic brands** for cost savings).

You need **very high flow rates** (consider **larger bore valves** like the 229-692 series).

Your environment has **severe contamination risks** (may need **sealed or IP-rated models**).

**Overall Verdict:** The **229-691 is a top-tier choice** for most **industrial pneumatic applications** where **reliability and performance** are non-negotiable. For **specialized or cost-sensitive applications**, evaluate alternatives carefully.

Details:

Call to use a shipping service other than the ones listed. 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 #: 229691 prices

• $37.13-$38.44

specifications generapneumati:

• brand: Asco Numatics
• mpn: 229-691
• part type: Hydraulic Pneumatic

shipping generapneumati:

• transit: 22-34 Days
• cost: $12.90
• service: Standard
• class: Standard
• type: Fixed

payments generapneumati:

• other
• wallet: Google-pay
• credit card: Diners-club

offer generapneumati:

• availability: In Stock
• quantity: 1
• sold: 0
• started: February 22, 2026
• options: Ship-to-home

general generapneumati:

• condition: Used
• Business Industrial > Hydraulics, Pneumatics, Pumps Plumbing > Other Hydraulics Pneumatics

seller generapneumati:

• rating: 99.5%
• city: 1 Millennium Dr, Willingboro, NJ 08046
• # reviews: 191365

returns generapneumati:

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

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