ASCO NUMATICS 256-879 Hydraulics Pneumatics

( Brand: Asco Numatics ), ( Manufacturer Part Number: 256-879 ), ( Part Type: Hydraulic Pneumatic )

Review ASCO NUMATICS 256879 Used

The **ASCO Numatics 256-879 (256879) Solenoid Valve** is a high-performance, direct-acting, normally closed (NC) pneumatic pilot valve designed for precise control in industrial automation and pneumatic systems. Engineered with robust construction, this valve is ideal for applications requiring reliable actuation, such as clamping, gripping, indexing, and general pneumatic cylinder operation. The 256-879 features a compact yet durable design, incorporating a sealed, corrosion-resistant body made from high-quality materials to ensure longevity and resistance to environmental factors like moisture, dust, and temperature fluctuations. Its direct-acting mechanism eliminates the need for external pilot pressure, simplifying installation and reducing system complexity while maintaining efficient energy use.

This valve operates on a 24 VDC electrical signal, providing consistent and repeatable performance with minimal hysteresis, making it well-suited for applications demanding precise positioning and rapid response times. The integrated coil is designed for low power consumption, reducing operational costs while maintaining reliability under continuous use. The valve s sealed construction ensures leak-free operation, protecting both the system and the surrounding environment from contamination. Additionally, its modular design allows for easy integration into existing pneumatic circuits, with standard mounting options and quick-connect fittings for streamlined installation.

The 256-879 is equipped with a robust internal pilot mechanism that ensures smooth and reliable switching, even under varying load conditions. Its normally closed configuration provides inherent safety by default, as the valve remains closed when power is off, preventing unintended air release. The valve s compact footprint and versatile mounting options including flange, pipe, or direct cylinder connection make it adaptable to a wide range of system configurations, from small automation cells to larger industrial setups. Whether used in packaging machinery, material handling systems, or automated manufacturing processes, this solenoid valve delivers consistent, high-performance operation with minimal maintenance requirements.

For applications requiring enhanced durability, the 256-879 can be paired with optional accessories such as flow control, pressure regulation, or position feedback devices, further expanding its functionality. Its compatibility with standard pneumatic fittings and ASCO s broader range of components ensures seamless integration into existing systems. Overall, the **ASCO Numatics 256-879 (256879)** is a dependable, high-efficiency solenoid valve that combines precision engineering with practical design, making it a trusted choice for engineers and technicians seeking reliable pneumatic control in demanding industrial environments.

### **Pros and Cons of buying a ASCO Numatics 256-879 (256879) Solenoid Valve**

The **ASCO Numatics 256-879** is a **2-way, normally closed (NC) pneumatic solenoid valve** commonly used in industrial automation, compressed air systems, and pneumatic control applications. Below is a detailed breakdown of its advantages and disadvantages.

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### **Pros**

1. **Reliability and Durability**

- ASCO Numatics is a well-established brand with a strong reputation for high-quality pneumatic components. The **256-879** is designed for heavy-duty industrial use, featuring robust construction that resists wear and tear over extended operation.

- The valve is built to handle frequent cycling, making it suitable for continuous use in manufacturing and automation systems.

2. **Wide Compatibility**

- The valve operates with standard compressed air pressures (typically **80 100 psi**), making it versatile for most industrial applications.

- It is compatible with **ASCO s standard fittings** (e.g., NPT, metric, or quick-connect ports), allowing easy integration into existing systems.

- Supports **both AC and DC power** (depending on the coil variant), providing flexibility in electrical control.

3. **Energy Efficiency**

- ASCO valves are designed to minimize air leakage when de-energized (due to their **normally closed** configuration), reducing wasted compressed air.

- The **low power consumption** of the solenoid coil helps lower electricity costs in automated systems.

4. **Easy Installation and Maintenance**

- The valve features **standard mounting options** (flanged, pipe thread, or quick-connect), simplifying installation.

- It has a **modular design**, allowing for easy replacement of internal components (e.g., seals, diaphragms) if maintenance is required.

- ASCO provides **detailed technical documentation**, making troubleshooting and servicing more straightforward.

5. **Noise Reduction**

- The valve is designed to **minimize air exhaust noise**, which is beneficial in environments where noise levels must be controlled (e.g., cleanrooms, sensitive manufacturing areas).

6. **Long Lifespan**

- With proper maintenance, the **256-879** can last **decades**, especially in applications with moderate to low cycling demands.

- ASCO s **sealed internal components** reduce contamination risks, extending the valve s operational life.

7. **Global Availability and Support**

- ASCO Numatics is a **global brand** with extensive distribution networks, ensuring easy access to spare parts and technical support.

- Many authorized distributors and OEMs stock this valve, reducing lead times for replacements.

8. **Safety Features**

- The **normally closed (NC) design** ensures that in the event of a power failure, the valve remains closed, preventing unintended air release.

- Some variants include **fail-safe mechanisms** that can be customized for specific safety requirements.

9. **Cost-Effective for High-Volume Use**

- While the upfront cost may be higher than some generic alternatives, its **longevity and reliability** make it cost-effective in long-term industrial applications.

- Reduces downtime due to failures, lowering maintenance costs over time.

10. **Compatibility with PLCs and Control Systems**

- The valve can be easily integrated into **PLC (Programmable Logic Controller) systems**, making it suitable for automated production lines.

- Supports **standard electrical signals** (e.g., 24V DC, 120V AC), simplifying integration with industrial control panels.

---

### **Cons**

1. **Higher Upfront Cost**

- Compared to **generic or no-name solenoid valves**, the **ASCO 256-879** is more expensive. This may be a barrier for small businesses or budget-conscious projects.

- Pricing can vary based on **quantity, coil type (AC/DC), and additional accessories** (e.g., filters, regulators).

2. **Limited Customization**

- While ASCO offers a range of variants, the **256-879 is a standard model**, meaning significant customization (e.g., unique port configurations, specialized materials) may require additional components or modifications.

- Not all versions support **high-flow rates** without additional staging or pilot valves.

3. **Potential for Overkill in Low-Demand Applications**

- If the application requires **minimal air flow or infrequent cycling**, a more basic (and cheaper) valve might suffice. The **256-879 s robust design** may be unnecessary in such cases.

- For **low-pressure or low-volume systems**, a simpler valve could be equally effective at a lower cost.

4. **Coil Sensitivity to Power Fluctuations**

- Some **AC-coil variants** may be sensitive to **voltage spikes or instability**, potentially leading to premature failure if the power supply is unreliable.

- **DC coils** are generally more stable but may require precise voltage regulation.

5. **Maintenance Requirements**

- **Contamination** (dirt, moisture, or oil in compressed air can damage internal seals).

- **Corrosion** (if exposed to humid or corrosive environments, stainless steel or coated variants may be needed).

- Users must follow **ASCO s recommended cleaning and lubrication procedures** to avoid premature wear.

6. **Lead Times for Special Orders**

- While standard models are widely available, **custom coil voltages, special materials, or bulk orders** may incur longer lead times.

- Some distributors may not stock all variants, requiring special ordering.

7. **Potential for Overheating in Continuous Operation**

- If the valve is **continuously energized in high-temperature environments**, the coil may overheat, reducing lifespan.

- Proper **ventilation and cooling** may be required in extreme conditions.

8. **Limited Direct Mounting Options**

- Unlike some **integrated solenoid valves**, the **256-879 is a separate unit** that requires additional piping or mounting hardware, which may add to installation complexity.

9. **Noise in High-Flow Applications**

- While ASCO valves are designed to **minimize noise**, in **high-flow applications**, the exhaust can still be audible, which may be a concern in sensitive environments.

10. **Dependence on Compressed Air Quality**

- The valve s performance **degrades if the compressed air is contaminated** (e.g., with oil, moisture, or particles). A **proper air filtration system** is essential to maintain reliability.

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### **Conclusion**

The **ASCO Numatics 256-879** is a **high-quality, reliable, and durable** solenoid valve well-suited for **industrial, automated, and high-demand pneumatic applications**. Its **robust construction, energy efficiency, and compatibility with standard systems** make it a **preferred choice** for manufacturers, automation engineers, and maintenance teams where **longevity and performance** are critical.

However, its **higher cost, limited customization, and maintenance requirements** may make it **less ideal for low-budget or low-demand applications**. If the application involves **frequent cycling, high air flow, or harsh environments**, the **256-879 is an excellent investment**. For **simple or cost-sensitive projects**, a **lower-cost alternative** (while still reliable) might be considered.

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### **Recommendation**

You need a **long-lasting, high-performance solenoid valve** for **industrial automation, manufacturing, or pneumatic control systems**.

Your application requires **reliable, low-leakage operation** with **minimal maintenance**.

You operate in an environment where **compressed air quality is controlled** (with proper filtration).

You prioritize **brand reliability, global support, and ease of integration** with PLCs and control systems.

The **upfront cost is justified by long-term savings** from reduced downtime and maintenance.

Your budget is **extremely tight**, and a **mid-range or budget solenoid valve** (e.g., from **Festo, SMC, or a reputable generic brand**) meets your needs.

The application involves **very low air flow or infrequent cycling**, where a simpler valve would suffice.

You require **highly customized specifications** (e.g., unique porting, specialized materials) that ASCO does not readily support.

Your **compressed air system is poorly maintained**, as contamination could shorten the valve s lifespan.

For **most industrial and automation applications**, the **ASCO 256-879 is a strong, well-supported choice** that balances **performance, durability, and reliability**. If cost is not a limiting factor, it is **highly recommended** for professional use. For **small-scale or cost-sensitive projects**, a **comparable but less expensive valve** from another trusted manufacturer should be evaluated first.

Details:

All products are guaranteed to be working but may show signs of use. Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection. Call to use a shipping service other than the ones listed. The product is used surplus.

part #: 256879 prices

• $29.00-$39.33

specifications generapneumati:

• brand: Asco Numatics
• mpn: 256-879
• part type: Hydraulic Pneumatic

general generapneumati:

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

seller generapneumati:

• city: 1 Millennium Dr, Willingboro, NJ 08046
• rating: 99.6%
• # reviews: 194441

payments generapneumati:

• wallet: Paypal
• credit card: Discover
• other

returns generapneumati:

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

offer generapneumati:

• started: March 13, 2026
• sold: 0
• options: Ship-to-home
• quantity: 2
• availability: In Stock

shipping generapneumati:

• service: Standard
• class: Standard
• type: Fixed
• cost: $12.90
• transit: 3-5 Days

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