STAFSJO KRA020D07P00 Pneumatic Steel Lugged Knife Gate Valve 8IN 150
( Brand: Stafsjo ), ( Manufacturer Part Number: KRA020D07P00 ), ( Part Type: Pneumatic Valve Knife ), ( Size: 8 In ), ( Actuation Type: Pneumatic ), ( Class: 150 ), ( Material: Steel ), ( Mounting Type: Flanged ), ( Reference Sku: 1760507 ), ( Product Condition: Used Excellent )
Review STAFSJO Pneumatic Steel Lugged Knife Gate Valve 8in 150
The **Stafsj KRA020D07P00 Pneumatic Steel Lugged Knife Gate Valve, 8 Inch (200 mm) Class 150** is a robust and precision-engineered industrial valve designed for demanding applications requiring reliable isolation, high durability, and efficient operation in harsh environments. Crafted from high-quality **carbon steel** construction, this valve is built to withstand extreme pressures, temperatures, and corrosive media, making it an ideal choice for industries such as oil and gas, chemical processing, wastewater treatment, and power generation. The **lugged design** ensures a secure and leak-proof connection to the pipeline, with reinforced flanges that distribute stress evenly, preventing deformation or failure under high operational loads. The **8-inch (200 mm) nominal size** provides ample flow capacity for large-diameter pipelines, minimizing pressure drops and ensuring optimal fluid dynamics while maintaining tight sealing performance.
What sets this valve apart is its **pneumatic actuation system**, which delivers smooth, precise, and forceful operation with minimal manual intervention. The integrated **double-acting pneumatic cylinder** allows for rapid opening and closing, reducing downtime and improving operational efficiency. The valve s **knife gate design** features a sharp, wedge-shaped disc that cuts through slurries, fibers, and abrasive materials with ease, preventing clogging and ensuring consistent flow control even in the most challenging media. The **Class 150 pressure rating** guarantees compatibility with systems operating at pressures up to **300 psi (20 bar)**, providing a robust safety margin for high-pressure applications. Additionally, the valve is equipped with **sealed stem and packing**, enhancing longevity by preventing leaks and contamination while maintaining smooth actuation.
For enhanced safety and reliability, the Stafsj KRA020D07P00 is engineered with **fail-safe mechanisms**, including optional **spring-return or fail-close/fail-open configurations**, ensuring the valve assumes a predetermined position in the event of air supply failure. The **pneumatic control system** can be integrated with automated process control systems, allowing for remote operation and monitoring via PLCs or SCADA platforms. The valve s **corrosion-resistant coatings** and **abrasion-resistant materials** further extend its service life, reducing maintenance requirements and operational costs. Whether deployed in critical pipeline isolation, slurry handling, or emergency shutdown applications, this valve delivers uncompromising performance, durability, and operational flexibility, making it a cornerstone of reliable fluid control in industrial settings.
### **Pros and Cons of buying a STAFSJO KRA020D07P00 Pneumatic Steel Lugged Knife Gate Valve (8" / 200mm, 150#)**
#### **Pros:** 1. **Material and Durability:**- Constructed from **carbon steel (likely A105 or similar)**, making it robust for heavy-duty applications in industrial settings.
- **Lugged design** ensures secure flanged connections, reducing leakage risks compared to wafer or double-flanged valves.
- Suitable for **abrasive slurries, solids, and wet/dry media**, making it ideal for mining, power plants, and wastewater treatment.
2. **Size and Pressure Rating:**- **8-inch (200mm) size** allows for high flow capacity, reducing pressure drops in large pipelines.
- **150# (Class 150) rating** provides sufficient pressure resistance for most standard industrial applications (up to 500 psi/35 bar).
3. **Knife Gate Mechanism:**- The **knife-edge disc** effectively seals against abrasive or fibrous materials, preventing clogging and ensuring reliable operation.
- Better suited for **slurry, pulp, or sticky substances** compared to traditional gate valves.
4. **Pneumatic Actuation:**- **Motorized or pneumatic operation** allows for **remote control**, reducing manual labor and improving safety in hazardous environments.
- Can be integrated with **automation systems** for process control.
5. **Corrosion Resistance (if specified):**- Some models may feature **stainless steel internals or coatings** (e.g., epoxy or rubber lining) to enhance resistance to corrosive media. Verify specifications if this is a concern.
6. **Widely Available and Standardized:**- As a **common industrial valve**, replacement parts and maintenance services are widely available.
- Complies with **ANSI/ASME standards**, ensuring compatibility with most piping systems.
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#### **Cons:** 1. **Limited Pressure and Temperature Range:**- **150# rating** may not be sufficient for **high-pressure applications** (e.g., oil & gas, high-pressure water systems).
- **Temperature limitations** (typically up to ** 200 C/400 F** for standard carbon steel) could restrict use in extreme heat environments.
2. **Abrasion and Wear:**- While designed for abrasive media, **frequent use with highly abrasive slurries** can lead to **faster wear** on the knife edge and seat.
- May require **more frequent maintenance** compared to non-abrasive service valves.
3. **Leakage Potential:**- **Lugged design** is secure, but **gasket failure** (if using standard rubber or PTFE) can occur over time, especially with aggressive media.
- **Knife gate valves are not tight-sealing** like ball or globe valves, meaning they may not be ideal for **zero-leakage applications**.
4. **Higher Initial Cost:**- Compared to **wafer-type or swing-check valves**, lugged knife gate valves are **more expensive** due to their robust construction.
- **Pneumatic actuation** adds to the cost if manual operation is an option.
5. **Maintenance Requirements:**- **Knife edges and seats** may need **periodic sharpening or replacement** to maintain sealing efficiency.
- **Actuator maintenance** (if pneumatic) includes checking seals, springs, and air supply systems.
6. **Not Ideal for Clean Fluids:**- **Overkill for water, oil, or gases** where a **ball valve or globe valve** would suffice knife gate valves are **specialized for solids-laden media**.
7. **Potential for Clogging:**- If the **disc or seat accumulates debris**, it may **jam or fail to close properly**, requiring cleaning or replacement.
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### **Conclusion:**The **STAFSJO KRA020D07P00 8" (200mm) 150# pneumatic steel lugged knife gate valve** is a **well-suited choice for industrial applications involving abrasive slurries, wet/dry solids, or fibrous materials** where a **durable, high-flow valve** is required. Its **lugged design, knife gate mechanism, and pneumatic actuation** make it reliable for **mining, wastewater treatment, power plants, and similar environments**.
However, it is **not ideal for high-pressure, high-temperature, or clean fluid applications**, where **ball valves, globe valves, or check valves** would be more appropriate. If **leakage tolerance is critical**, consider **double-flanged or metal-seated alternatives**.
### **Recommendation:** - **Buy if:**- You need a **high-capacity valve for abrasive or slurry service**.
- **Remote operation (pneumatic/motorized) is required** for safety or automation.
- Your system operates within **150# pressure and standard temperature limits**.
- **Lugged flanges** are preferred for secure, non-leaking connections.
- **Avoid if:**- Your application involves **clean fluids (water, oil, gas)** a **ball or globe valve** would be more cost-effective.
- You require **zero-leakage performance** consider a **metal-seated gate valve or ball valve**.
- The system experiences **extreme pressures (>500 psi) or temperatures (>200 C)** a **higher-class valve (e.g., 300# or 600#) may be needed**.
- Budget constraints exist **wafer-type or manual valves** could be a cheaper alternative.
**Final Verdict:** This valve is a **solid industrial workhorse** for its intended applications but may not be the best fit for all piping scenarios. **Verify material specifications (e.g., coatings, internals) and maintenance requirements** before purchasing to ensure it meets your exact needs.
Details:
Pneumatic Directional Valves. Actuation Type:Pneumatic. Pneumatic Filter-Regulators. Model Number:KRA020D07P00.
Pneumatic Cylinders. Pneumatic Exhaust Valves. Pneumatic Filters.
part #: kra020d07p00 price
- $1000.00
specifications valvesplumbing:
- brand: Stafsjo
- mpn: Kra020d07p00
- part type: Pneumatic Valve Knife
- size: 8 In
- actuation type: Pneumatic
- class: 150
- material: Steel
- mounting type: Flanged
- reference sku: 1760507
- product condition: Used Excellent
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- condition: Used
- Hydraulics, Pneumatics, Pumps Plumbing > Valves Manifolds > Gate Valves
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- city: Delta, Ohio
- # reviews: 126855
- rating: 100.0%
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- started: April 10, 2026
- quantity: 3
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- options: Ship-to-home
- availability: In Stock
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