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DEZURIK 9277311R002 Manual Lugged Knife Gate Valve 8IN 150

9277311r002 Dezurik Manual Stainless Lugged Knife Gate Valve 8in 150

( Brand: Dezurik ), ( Manufacturer Part Number: 9277311R002 ), ( Part Type: Valve Manual Knife ), ( Size: 8 In ), ( Material: Stainless ), ( Class: 150 ), ( Actuation Type: Manual ), ( Reference Sku: 1749910 ), ( Product Condition: Used Excellent )

Review DEZURIK Manual Stainless Lugged Knife Gate Valve 8in 150

The **Dezurik 9277311R002 Manual Lugged Knife Gate Valve, 8-inch (200 mm) Class 150** is a robust and precision-engineered industrial valve designed to deliver reliable, high-performance flow control in demanding applications where durability and ease of maintenance are paramount. Part of Dezurik s trusted line of knife gate valves, this model features a **lugged body construction**, which provides a secure and leak-proof connection without the need for welding, making it ideal for temporary or permanent installations in pipelines handling abrasive slurries, solids-laden fluids, or corrosive media. The **8-inch (200 mm) nominal size** ensures compatibility with large-diameter piping systems, accommodating substantial flow rates while maintaining operational efficiency. Built to **Class 150 pressure ratings**, this valve can withstand operating pressures up to 300 psi (2.1 MPa) at standard temperatures, offering versatility across a wide range of industrial processes, including wastewater treatment, mining, power generation, and chemical processing.

The valve s **manual operation** is facilitated by a sturdy, easily accessible handwheel or lever mechanism, allowing for straightforward on/off control without the need for external power sources. The **knife gate design** incorporates a sharp-edged disc that efficiently seals against the seat, preventing leakage and minimizing wear from suspended solids or fibrous materials that could otherwise clog or damage conventional gate valves. The **lugged flange configuration** ensures quick and secure installation, as the valve can be bolted directly into place using standard flange gaskets, reducing downtime and simplifying field modifications. Constructed from **cast ductile iron (ASTM A536 Grade 65-45-12)** with a **carbon steel disc and wedge**, this valve delivers exceptional resistance to corrosion, abrasion, and thermal stress, extending its service life even in the harshest environments.

For added protection against leakage and contamination, the valve is equipped with **EPDM or Nitrile (Buna-N) seat and gasket materials**, which offer excellent chemical resistance and longevity. The **double-disc design** further enhances sealing performance by reducing the risk of disc binding or misalignment, while the **self-lubricating graphite coating** on the disc and seat minimizes friction during operation, reducing wear and tear over time. The **manual stem assembly** is designed for smooth, low-effort actuation, ensuring reliable performance even after prolonged use. Whether deployed in a municipal wastewater treatment plant, a coal-fired power station, or an industrial slurry pipeline, the Dezurik 9277311R002 excels as a dependable, low-maintenance solution for controlling high-capacity flows with minimal operational hassle. Its combination of **durability, ease of installation, and robust sealing** makes it a preferred choice for engineers and operators seeking a valve that balances performance with practicality in heavy-duty applications.

### **Pros and Cons of buying a Dezurik 9277311R002 Manual Lugged Knife Gate Valve (8" x 150#)**

#### **Pros:**

1. **Durability and Build Quality**

The Dezurik valve is designed for heavy-duty industrial applications, featuring a robust construction with forged components and high-strength materials. The lugged design ensures a secure, leak-free connection when properly installed, making it suitable for demanding environments like wastewater treatment, chemical processing, or mining.

2. **Knife Gate Mechanism**

The knife gate design is ideal for handling slurries, abrasive materials, and solids-laden fluids. Unlike traditional gate valves, the knife edge cuts through debris, preventing clogging and ensuring reliable operation even with difficult media.

3. **High Pressure and Temperature Ratings**

With a 150# (Class 150) rating, this valve can handle pressures up to 290 psi (2 MPa) and temperatures up to approximately 450 F (232 C), depending on the body material (likely cast iron or ductile iron). This makes it versatile for various industrial processes.

4. **Manual Operation**

Being a manually operated valve, it requires no external power source, making it cost-effective and low-maintenance for applications where automation is unnecessary. It also allows for precise control during maintenance or startup/shutdown procedures.

5. **Compatibility with Lugged Flanges**

Lugged flanges provide a secure, reusable connection that can be tightened multiple times without damaging gaskets or bolts. This is particularly useful in applications where frequent disassembly is required for cleaning or inspection.

6. **Widely Available Spare Parts**

Dezurik is a well-known brand in industrial valves, so replacement parts (seats, gaskets, stems, etc.) are readily available from distributors or directly from the manufacturer.

7. **Corrosion Resistance (Depending on Material)**

If the valve body is made of stainless steel or other corrosion-resistant alloys, it will perform well in aggressive chemical environments. However, standard cast iron versions may require additional protection in highly corrosive settings.

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#### **Cons:**

1. **High Initial Cost**

Dezurik valves are premium products, and this 8" x 150# knife gate valve will likely be more expensive than generic or lower-brand alternatives. The cost may be justified by its longevity and performance, but it can be a significant upfront investment.

2. **Manual Operation Limitations**

While manual valves are reliable, they require physical effort to operate, especially in larger sizes. In automated systems or high-traffic applications, this can lead to operator fatigue or inefficiency. An electric or pneumatic actuator would be needed for remote control, adding to the cost.

3. **Maintenance Requirements**

Knife gate valves can wear out over time due to the abrasive nature of the media they handle. The knife edge and seat may require periodic replacement, and the gaskets or packing may need lubrication or replacement to prevent leaks.

4. **Potential for Leaks at Lugged Connections**

If the lugged flanges are not properly torqued or if the gaskets degrade, leaks can occur. This requires careful installation and regular inspection to ensure tightness.

5. **Limited Flow Coefficient (Cv)**

Knife gate valves are not ideal for high-flow applications with clean fluids, as they create significant resistance. Their primary purpose is solids handling, not throttling or precise flow control.

6. **Weight and Installation Complexity**

An 8" valve is heavy and bulky, requiring proper support and alignment during installation. Improper installation can lead to misalignment, increased wear, or premature failure.

7. **Material Limitations**

Standard cast iron or ductile iron bodies may not be suitable for highly corrosive or cryogenic applications. If the valve is exposed to extreme conditions, a more expensive material (e.g., stainless steel or alloy steel) may be necessary.

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### **Conclusion:**

The **Dezurik 9277311R002 Manual Lugged Knife Gate Valve (8" x 150#)** is a high-quality, durable valve well-suited for industrial applications involving slurries, abrasive materials, or solids-laden fluids. Its knife gate design ensures reliable operation in demanding environments, and the lugged construction provides a secure, reusable connection. However, its manual operation, higher cost, and maintenance needs may not be ideal for all applications.

This valve is best suited for:

- Wastewater treatment plants

- Chemical processing (with appropriate materials)

- Mining and aggregate handling

- Power plants (for ash or slurry systems)

- Any application where solids handling is critical

It may not be the best choice for:

- High-flow, clean fluid applications (where ball or globe valves would be more efficient)

- Fully automated systems (unless an actuator is added)

- Budget-conscious projects where lower-cost alternatives can suffice

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### **Recommendation:**

If your application involves **abrasive or solids-laden fluids** and requires a **reliable, long-lasting valve**, the Dezurik 9277311R002 is an excellent investment despite its higher cost. Ensure proper installation, regular maintenance, and the use of compatible materials for your specific environment.

For **clean fluid applications or high-flow systems**, consider alternative valve types (e.g., ball valves, globe valves, or plug valves) that may offer better flow characteristics and lower maintenance.

If **automation is needed**, evaluate the cost of adding an electric or pneumatic actuator to justify the initial expense.

Ultimately, weigh the **long-term reliability and performance** against the **upfront cost** to determine if this valve aligns with your project s requirements.

Details:

Knife Gate Valves. Valve Bodies and Manifolds. Shock Absorbs. Pressure Regulator Valves.

Actuation Type:Manual.

part #: 9277311r002 price

  • $847.65

specifications valvesplumbing:

  • brand: Dezurik
  • mpn: 9277311r002
  • part type: Valve Manual Knife
  • size: 8 In
  • material: Stainless
  • class: 150
  • actuation type: Manual
  • reference sku: 1749910
  • product condition: Used Excellent

shipping valvesplumbing:

  • class: Standard, Expedited, One-day
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offer valvesplumbing:

  • quantity: 2
  • started: March 11, 2026
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general valvesplumbing:

  • Hydraulics, Pneumatics, Pumps Plumbing > Valves Manifolds > Gate Valves
  • condition: Used

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  • city: Delta, Ohio

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part type: valve manual knife, size: 8 in, class: 150, actuation type: manual, reference sku: 1749910, product condition: used excellent,
category: business & industrial > hydraulics, pneumatics, pumps plumbing > valves manifolds > gate valves, material: stainless, sku: 22980081577827983,
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