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  3. SCHRADER BELLOWS 3538-3670

SCHRADER BELLOWS 3538-3670 Parker

3538-3670 Schrader Bellows Parker / 35383670 Used

( Brand: Schrader Bellows ), ( Manufacturer Part Number: 3538-3670 )

Review SCHRADER BELLOWS Parker 35383670 Used

The **Schrader Bellows 3538-3670**, manufactured by Parker Hannifin under the **35383670** part number, is a high-performance, precision-engineered diaphragm seal designed for demanding fluid handling applications where reliability, durability, and chemical resistance are paramount. This bellows-style diaphragm seal is specifically engineered to provide an effective barrier between the process fluid and the instrument or sensor it protects, ensuring accurate measurements while preventing contamination, leakage, or corrosion. Constructed from **316L stainless steel**, this bellows exhibits exceptional strength and corrosion resistance, making it ideal for use in aggressive environments such as chemical processing, pharmaceutical manufacturing, semiconductor fabrication, and high-purity water systems. The **Schrader-style connection** at the top of the bellows allows for secure and leak-tight attachment to pressure gauges, transmitters, or other instrumentation, while the **flanged or threaded bottom connection** (depending on the specific variant) ensures compatibility with a wide range of piping systems, including those adhering to industry standards like ANSI, DIN, or JIS. The bellows design incorporates a **multi-layered corrugated structure**, which enhances flexibility and accommodates thermal expansion and contraction without compromising structural integrity, thus minimizing stress on the attached instrumentation. This feature is particularly advantageous in applications involving temperature fluctuations or dynamic pressure variations. The **3538 series** is renowned for its ability to maintain a consistent and accurate seal over extended periods, even under cyclic loading conditions, making it a preferred choice for applications requiring long-term reliability. Additionally, the bellows can be customized with **PTFE (polytetrafluoroethylene) or other compatible elastomers** on the internal surfaces to further enhance chemical resistance and reduce friction, ensuring optimal performance across a broad spectrum of fluids, including acids, alkalis, and solvents. Whether deployed in high-pressure systems, vacuum applications, or corrosive environments, the Schrader Bellows 3538-3670 delivers a robust solution that balances mechanical resilience with precise fluid isolation, making it an indispensable component in critical process control and measurement systems.

### **Schrader Bellows 3538-3670 (Parker 35383670) Pros and Cons**

#### **Overview**

The Schrader Bellows 3538-3670 (Parker part number 35383670) is a flexible metal bellows coupling designed to absorb axial, angular, and lateral misalignment in mechanical systems. It is commonly used in industrial applications, including pumps, compressors, and rotating machinery, where vibration isolation and compensation for misalignment are critical.

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### **Pros**

1. **High Misalignment Tolerance**

- The bellows design allows for significant axial, angular, and lateral movement, reducing stress on connected components. This makes it ideal for applications where misalignment is unavoidable due to thermal expansion, foundation settling, or installation inaccuracies.

2. **Vibration Damping**

- The flexible metal bellows absorbs and dampens vibrations, improving system stability and reducing wear on connected equipment. This is particularly beneficial in high-speed or high-vibration environments.

3. **Durability and Longevity**

- Constructed from high-quality stainless steel or other corrosion-resistant materials, these bellows couplings are designed for long-term performance in harsh environments, including exposure to moisture, chemicals, and temperature fluctuations.

4. **Compact and Lightweight**

- Compared to other types of flexible couplings (e.g., elastomeric or gear couplings), bellows couplings are often more compact and lighter, making them easier to install in space-constrained applications.

5. **Low Maintenance**

- Since the bellows coupling has no internal lubrication requirements (unlike some gear or grid couplings), it reduces maintenance needs and downtime. The absence of moving parts also minimizes wear over time.

6. **Corrosion Resistance**

- Many versions of this coupling are made from stainless steel or coated materials, providing excellent resistance to corrosion in wet or chemically aggressive environments.

7. **Compatibility with Various Shaft Sizes**

- The Schrader bellows coupling is available in multiple sizes and configurations to accommodate a wide range of shaft diameters and connection types (e.g., keyed, keyless, or splined).

8. **Backlash-Free Operation**

- Unlike some gear or grid couplings, bellows couplings do not introduce backlash, ensuring precise torque transmission and consistent performance in applications requiring accuracy.

9. **Wide Temperature Range**

- Depending on the material, these couplings can operate effectively in extreme temperature environments, from cryogenic to high-heat applications.

10. **Quiet Operation**

- The smooth, flexible design of the bellows reduces noise generation compared to rigid or gear-type couplings, which can be advantageous in noise-sensitive applications.

---

### **Cons**

1. **Limited Torque Capacity**

- Bellows couplings generally have lower torque capacity compared to rigid or gear couplings. They are not suitable for high-torque applications where robust torque transmission is required. For example, they may not be ideal for heavy-duty industrial machinery like large motors or high-power pumps without proper sizing.

2. **Fatigue and Wear Over Time**

- The flexible metal bellows can experience fatigue and wear due to repeated flexing, especially in high-cycle applications. Over time, this may lead to reduced flexibility, leaks (if sealed), or failure if not properly maintained or if overloaded.

3. **Sensitivity to Misalignment Beyond Specifications**

- While bellows couplings tolerate misalignment well, exceeding their specified limits can cause premature failure. Improper installation or excessive movement can damage the bellows or connected shafts.

4. **Cost**

- High-quality bellows couplings, particularly those made from corrosion-resistant materials or with specialized coatings, can be more expensive than alternative coupling types (e.g., elastomeric or grid couplings). The cost may also increase with custom sizes or configurations.

5. **Potential for Leaks (Sealed Versions)**

- Some bellows couplings are sealed to prevent contamination or fluid ingress. If damaged, these can leak, which may require additional maintenance or replacement. Non-sealed versions avoid this issue but may not be suitable for clean or sterile environments.

6. **Limited Availability of Customization**

- While Schrader/Parker offers a range of standard sizes, customizing the coupling for non-standard shaft sizes or connection types may require additional lead time or higher costs.

7. **Installation Complexity**

- Proper alignment and installation are critical to the performance of bellows couplings. Misalignment during installation can lead to premature failure. This may require skilled labor or specialized tools.

8. **Not Suitable for High-Speed Applications with Large Axial Movements**

- In applications with very high speeds combined with large axial movements, the bellows may experience excessive stress or resonance issues, leading to reduced lifespan or failure.

9. **Potential for Resonance**

- In some cases, the natural frequency of the bellows coupling can align with the operating frequency of the system, leading to resonance and increased vibration. This requires careful selection and analysis to avoid.

10. **Limited Backward Compatibility**

- If replacing an existing coupling, the Schrader bellows may not be directly interchangeable with other types (e.g., gear or elastomeric couplings) due to differences in mounting patterns, torque capacity, or misalignment tolerance.

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### **Conclusion**

The Schrader Bellows 3538-3670 (Parker 35383670) is an excellent choice for applications requiring **flexibility, vibration damping, and misalignment compensation** in moderate to high-speed systems with moderate torque demands. Its **durability, corrosion resistance, and low-maintenance design** make it suitable for industrial environments where reliability is critical. However, it is **not ideal for high-torque, high-load, or extremely high-speed applications** where rigid or gear couplings may be more appropriate.

The coupling s strengths lie in its ability to **absorb vibrations, handle misalignment, and operate quietly**, making it well-suited for **pumps, compressors, turbines, and other rotating machinery** where smooth operation and longevity are priorities. Conversely, its **lower torque capacity, potential for fatigue, and higher cost** compared to alternatives may limit its use in certain heavy-duty or high-torque applications.

---

### **Recommendation**

**Buy the Schrader Bellows 3538-3670 (Parker 35383670) if:**

- Your application requires **flexibility to handle axial, angular, or lateral misalignment**.

- **Vibration damping** is a priority to protect connected equipment.

- The system operates in a **corrosive or harsh environment** where durability is needed.

- You need a **low-maintenance, compact coupling** for moderate torque applications.

- The operating conditions involve **moderate speeds and temperatures** within the coupling s specifications.

**Avoid or consider alternatives if:**

- Your application demands **high torque transmission** (e.g., heavy-duty motors, large compressors). In such cases, a **gear coupling or grid coupling** may be more suitable.

- The system experiences **extreme axial movements or high-speed resonance risks**, which could lead to premature failure.

- Cost is a major concern, as bellows couplings may be more expensive than simpler elastomeric or sleeve couplings for low-torque applications.

- You require **backward compatibility** with existing couplings that use different mounting patterns or torque capacities.

**Final Suggestion:**

Before purchasing, **verify the coupling s specifications** (torque capacity, misalignment limits, temperature range, and material compatibility) against your specific application requirements. Consult the **Parker Schrader technical documentation** or a mechanical engineer to ensure the coupling is properly sized and suited for your system. If in doubt, consider a **test run or pilot installation** to confirm performance in your environment.

Details:

All products are guaranteed to be working but may show signs of use if purchasing a used product. Sells new and surplus product develops channels to purchase such. 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.

part #: 35383670 prices

  • $381.00-$382.00

specifications generapneumati:

  • brand: Schrader Bellows
  • mpn: 3538-3670

general generapneumati:

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

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  • # reviews: 193529
  • city: 1 Millennium Dr, Willingboro, NJ 08046
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  • availability: In Stock
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  • started: March 9, 2026
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category: business & industrial > hydraulics, pneumatics, pumps plumbing > hydraulics pneumatics, sku: 17454657244676632,
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