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  3. KEYSTONE 368-810-004

KEYSTONE 368-810-004 Wafer Check Valve 4IN 150

368-810-004 Keystone Stainless Wafer Check Valve 4in 150

( Brand: Keystone ), ( Manufacturer Part Number: 368-810-004 ), ( Part Type: Valve Check ), ( Size: 4 In ), ( Class: 150 ), ( Mounting Type: Wafer ), ( Material: Stainless ), ( Reference Sku: 1751747 ), ( Product Condition: Used Excellent )

Review KEYSTONE Stainless Wafer Check Valve 4in 150

The **Keystone 368-810-004 Wafer Check Valve (4" Size, 150 PSI Rating)** is a high-performance, full-port, wafer-style check valve engineered for demanding industrial applications where reliable flow control and minimal pressure loss are critical. Designed with precision engineering, this valve features a robust **4-inch (100mm) nominal size** and a **150 PSI (10.3 bar) working pressure rating**, making it suitable for a wide range of fluid handling systems, including water distribution, fire protection, HVAC, and municipal infrastructure. Its **wafer-style construction** allows for easy installation between flanges without requiring additional gaskets or spacers, reducing installation time and labor costs while maintaining a compact footprint. The valve incorporates a **full-port design**, ensuring unobstructed flow when open and minimizing head loss, which is essential for maintaining system efficiency and reducing energy consumption.

Constructed from **ductile iron** with a **ductile iron body and cast iron disc assembly**, the Keystone 368-810-004 is built to withstand harsh environmental conditions, including exposure to corrosive fluids, temperature fluctuations, and mechanical stress. The **rubber-seated disc mechanism** provides a tight seal, preventing backflow while allowing smooth operation under varying pressure differentials. The valve s **spring-loaded closure** ensures rapid and reliable shutoff in the event of reverse flow, protecting downstream equipment from potential damage caused by water hammer or backpressure surges. Additionally, the **wafer-style mounting** eliminates the need for extra flange spacers, simplifying installation in tight spaces and reducing material costs.

This check valve is equipped with **standard ANSI 125 or 150 flanges**, ensuring compatibility with most industry-standard piping systems. Its **full-lug design** allows for easy removal and replacement without disrupting the entire pipeline, making maintenance and inspections straightforward. The valve s **durable construction** and **corrosion-resistant materials** extend its service life, reducing the need for frequent replacements and lowering long-term operational costs. Whether used in **municipal water systems, fire sprinkler networks, or industrial process lines**, the Keystone 368-810-004 delivers consistent performance, reliability, and ease of installation, making it an ideal choice for engineers and contractors seeking a high-quality, long-lasting solution.

### **Pros and Cons of buying a Keystone 368-810-004 Wafer Check Valve (4" x 150 PSI)**

#### **Pros:**

1. **High Pressure Rating (150 PSI)** Suitable for medium to heavy-duty applications where backflow prevention is critical, such as in industrial piping, water treatment, or fire protection systems.

2. **Wafer-Type Design** Compact and easy to install between flanges without requiring additional space or pipe extensions, reducing installation time and cost.

3. **Reliable Backflow Prevention** The check valve ensures unidirectional flow, preventing reverse flow that could damage pumps or contaminate systems.

4. **Durable Construction** Likely made from materials like cast iron, ductile iron, or stainless steel (depending on the model variant), offering long-term durability in harsh environments.

5. **Standardized Sizing (4")** Fits common piping systems, making it a versatile choice for retrofits or new installations.

6. **Low Maintenance** Once properly installed, wafer check valves typically require minimal upkeep, reducing operational costs.

7. **Compatibility with ANSI Standards** Designed to meet industry standards, ensuring proper sealing and performance in critical applications.

#### **Cons:**

1. **Limited Pressure Range** While 150 PSI is sufficient for many applications, it may not be adequate for high-pressure systems (e.g., oil/gas pipelines or extreme industrial processes).

2. **Potential for Leakage Over Time** Like all mechanical check valves, wear on the sealing mechanism (e.g., rubber or elastomeric disc) can occur with prolonged use, requiring eventual replacement.

3. **Installation Constraints** Wafer valves require precise alignment and proper flange gaskets to prevent leaks. Improper installation can lead to failure.

4. **Higher Cost Than Swing Check Valves** Compared to simpler swing check valves, wafer check valves may be more expensive due to their compact design and specialized construction.

5. **Limited Flow Capacity in Some Cases** Depending on the valve s internal design, it may cause slight pressure drops or turbulence, which could affect system efficiency in high-flow applications.

6. **Material Dependence** If the valve is made from cast iron or ductile iron, it may be susceptible to corrosion in aggressive environments (e.g., seawater, acidic fluids) unless coated or made from stainless steel.

7. **Not Ideal for High-Temperature Applications** Most standard wafer check valves have temperature limits (typically up to 200 F or 93 C), which may restrict use in high-heat environments.

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### **Conclusion**

The **Keystone 368-810-004 wafer check valve (4" x 150 PSI)** is a **practical choice for medium-duty backflow prevention** in applications where space is limited and standard pressure requirements are met. Its compact design, ease of installation, and reliability make it suitable for municipal water systems, fire protection, and industrial piping where backflow must be controlled. However, it is **not ideal for high-pressure, high-temperature, or corrosive environments** without additional modifications (e.g., stainless steel construction or special coatings).

If your application involves **extreme pressures, temperatures, or aggressive fluids**, you may need a heavier-duty valve (e.g., lug-type or full-port design). Conversely, if **cost efficiency and simplicity** are priorities, a standard swing check valve might suffice.

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### **Recommendation**

**Buy this valve if:**

- You need a **compact, flange-mounted check valve** for a **4" pipe system** operating at **up to 150 PSI**.

- Your application involves **water distribution, fire sprinklers, or industrial piping** where backflow prevention is critical but extreme conditions are not present.

- You prefer **minimal installation complexity** and **low maintenance** requirements.

**Consider alternatives if:**

- Your system requires **higher pressure ratings (e.g., 300 PSI or more)** or **extreme temperatures**.

- The fluid is **highly corrosive**, and you need **stainless steel or specialized materials**.

- You have **high-flow demands**, and a **full-port valve** would reduce pressure drop.

- Budget constraints allow for **less expensive swing check valves** that meet your needs.

**Final Verdict:** For most **standard municipal, fire protection, or industrial water applications**, this valve is a **solid, cost-effective solution**. Verify the material specifications and installation requirements to ensure compatibility with your specific system.

Details:

Valve Bodies and Manifolds. Pressure Regulator Valves. Mounting Type:Wafer.

part #: 368810004 prices

  • $149.00-$275.00

specifications valvesplumbing:

  • brand: Keystone
  • mpn: 368-810-004
  • part type: Valve Check
  • size: 4 In
  • class: 150
  • mounting type: Wafer
  • material: Stainless
  • reference sku: 1751747
  • product condition: Used Excellent

shipping valvesplumbing:

  • class: Standard, Expedited, One-day
  • service: Standard, Expedited, Overnight
  • transit: 6-6 Days
  • cost: $0.00
  • type: Fixed

seller valvesplumbing:

  • city: Delta, Ohio
  • # reviews: 125541
  • rating: 100.0%

returns valvesplumbing:

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

general valvesplumbing:

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

payments valvesplumbing:

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  • wallet: Apple-pay

offer valvesplumbing:

  • options: Ship-to-home
  • started: March 18, 2026
  • quantity: 1
  • best offers: True
  • availability: In Stock
  • sold: 0
part type: valve check, size: 4 in, class: 150, mounting type: wafer, reference sku: 1751747, product condition: used excellent,
category: business & industrial > hydraulics, pneumatics, pumps plumbing > valves manifolds > check foot valves, material: stainless, sku: 23148107249531892,
Keystone 368-810-004 Is Similar To:
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2 offers $149.00–$275.00 USD
  • New – Open box. Offer #1 priced at $275.00 + $13.32 shipping estimate = $288.32* total. No problem! J&J Promise.+$13.32 shipping
  • Used. Offer #2 priced at $149.00 + $40.38 shipping estimate = $189.38* total. +$40.38 shipping

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