TELEDYNE 1875-OL Relief Valve Npt 200PSI 1/2IN 3/4IN

( Brand: Teledyne ), ( Manufacturer Part Number: 1875-OL ), ( Part Type: Valve ), ( Set Pressure: 200 Psi ), ( Reference Sku: 1766240 ), ( Product Condition: Used Excellent )

Review TELEDYNE Relief Valve 200psi 1/2in 3/4in Npt

The **Teledyne 1875-OL Relief Valve**, a robust and precision-engineered component designed for critical pressure management applications, represents a reliable solution for systems requiring consistent and safe pressure regulation. This **spring-loaded relief valve**, rated for **200 psi (13.8 bar) working pressure**, is engineered to protect hydraulic, pneumatic, or industrial fluid systems from excessive pressure buildup, ensuring operational integrity and preventing catastrophic failures. With a **1/2-inch (NPT) inlet/outlet connection**, it seamlessly integrates into standard piping configurations, offering versatility for both new installations and retrofits. The **3/4-inch (NPT) drain port** provides an efficient pathway for excess fluid discharge, minimizing system downtime and reducing maintenance demands. Constructed from high-quality materials, including a durable **bronze or stainless steel body** (depending on the specific variant), this valve is built to withstand harsh environments, corrosion, and repeated cycling, making it ideal for demanding industrial, marine, or off-highway applications. Its **adjustable spring mechanism** allows for precise pressure setting calibration, ensuring optimal performance tailored to specific system requirements. The **pilot-operated design** enhances responsiveness, quickly releasing excess pressure while maintaining system stability. Whether deployed in hydraulic power units, air compressors, or fluid power systems, the Teledyne 1875-OL delivers dependable protection, operational efficiency, and long-term reliability making it an indispensable component for engineers and technicians prioritizing safety and performance.

The Teledyne 1875-OL is a spring-loaded relief valve designed for pressure protection in hydraulic, pneumatic, and fluid power systems. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of buying a Teledyne 1875-OL Relief Valve (200 PSI, 1/2" Inlet, 3/4" Outlet, NPT)**

1. **Reliable Pressure Regulation**

The valve is engineered to maintain precise pressure control within the system, preventing overpressure conditions that could damage equipment or pose safety risks. Its 200 PSI setting is suitable for moderate to high-pressure applications where consistent protection is critical.

2. **Durable Construction**

Teledyne is a reputable manufacturer known for quality components, and this valve is built with materials designed for longevity. The stainless steel or brass construction (depending on the model variant) resists corrosion, wear, and fatigue, extending the valve s operational life.

3. **Adjustable Pressure Setting**

The valve allows for field adjustment of the pressure setting (within its rated range), providing flexibility to accommodate varying system requirements. This is useful in applications where pressure demands may change over time.

4. **Compact and Space-Efficient Design**

With a 1/2" inlet and 3/4" outlet, the valve is compact yet capable of handling moderate flow rates without significant pressure drop. This makes it suitable for installations where space is limited.

5. **Direct Acting (Pilot-Operated Option Available)**

The 1875-OL is a direct-acting valve, meaning it responds immediately to pressure changes without requiring external pilot signals. This ensures rapid protection in case of overpressure events. Some variants may also offer pilot-operated options for more complex systems.

6. **Compatibility with Common Fluids**

The valve is designed to work with hydraulic oils, water, air, and other non-corrosive fluids, making it versatile for industrial, automotive, and machinery applications.

7. **Easy Installation and Maintenance**

The NPT (National Pipe Thread) connections ensure a secure, leak-proof fit with standard piping systems. The valve s design also allows for straightforward maintenance, such as cleaning or replacing the spring if needed.

8. **Backpressure Tolerance**

The valve can handle some degree of backpressure, which is beneficial in systems where the outlet side may experience resistance.

9. **Certifications and Compliance**

Teledyne products often meet industry standards (e.g., ISO, SAE, or API), ensuring reliability and compatibility with regulated systems.

10. **Widely Available and Supported**

As a well-established product, spare parts, technical support, and replacement valves are readily available from Teledyne or authorized distributors.

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### **Cons of buying a Teledyne 1875-OL Relief Valve**

1. **Limited Flow Capacity**

While the 1/2" inlet and 3/4" outlet are adequate for many applications, larger systems with high flow rates may require a valve with a larger port size (e.g., 3/4" inlet or 1" inlet). The 1875-OL may struggle in high-demand scenarios, leading to premature wear or failure.

2. **Pressure Drop at High Flows**

Even though the valve is designed for moderate flow, significant backpressure or high flow rates can cause noticeable pressure drops, reducing system efficiency.

3. **Potential for Leakage Over Time**

Like all mechanical valves, the 1875-OL may develop leaks at the seals or stem over time due to wear or contamination. Regular inspection and maintenance are required to prevent this.

4. **Adjustment Sensitivity**

The pressure adjustment mechanism may require careful handling to avoid accidental changes. In dynamic environments, this could lead to unintended pressure fluctuations if not secured properly.

5. **Cost Relative to Alternatives**

While not excessively expensive, the Teledyne 1875-OL may be pricier than generic or lower-end relief valves from less established brands. For budget-conscious applications, alternatives might exist, though with potential trade-offs in quality or longevity.

6. **Limited Customization**

The valve s design is standardized, and significant customization (e.g., material changes, specialized coatings) may not be possible without modifying the unit or sourcing a custom variant.

7. **Potential for Pilot Valve Dependency (If Applicable)**

While the direct-acting version is reliable, some Teledyne relief valves in similar series require a pilot valve for operation. If this is the case, additional components and complexity are introduced.

8. **Environmental Sensitivity**

Contaminants such as dirt, moisture, or chemical residues in the fluid can affect the valve s performance, leading to sticking or inaccurate pressure regulation. Filtration upstream is recommended.

9. **No Built-in Drain or Bleed Feature**

Some relief valves include features like automatic draining or bleeding to remove trapped air or contaminants. The 1875-OL may lack these, requiring manual intervention during maintenance.

10. **Warranty Limitations**

Like most industrial components, the warranty may exclude damage from misuse, improper installation, or environmental factors. Users must adhere to installation and operational guidelines to retain coverage.

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### **Conclusion**

The Teledyne 1875-OL relief valve is a robust, reliable choice for applications requiring precise pressure protection in moderate to high-pressure systems. Its direct-acting design, adjustability, and durability make it suitable for a wide range of industrial, hydraulic, and pneumatic applications. However, its limitations in flow capacity, potential for leakage, and sensitivity to contamination must be carefully considered. For systems with high flow demands or extreme environmental conditions, additional safeguards (e.g., filtration, regular maintenance) are essential.

The valve s strengths such as its brand reputation, ease of installation, and compatibility with standard fluids outweigh its drawbacks for many users, particularly those prioritizing reliability and long-term performance.

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### **Recommendation**

- Your system operates within the valve s rated pressure (200 PSI) and flow capacity.

- You require a direct-acting, adjustable relief valve with minimal external dependencies.

- The application involves hydraulic oil, air, or water in a controlled environment where contamination is managed.

- You value a reputable brand with available technical support and spare parts.

- Your system demands significantly higher flow rates (e.g., >10 GPM), in which case a larger port size (e.g., 3/4" or 1" inlet) may be necessary.

- The environment is highly corrosive or abrasive, requiring a valve with specialized coatings or materials.

- Cost is a critical factor, and you are open to exploring lower-cost, equally reliable options from other manufacturers (e.g., Parker, Bosch, or Sun Hydraulics).

- You need additional features such as remote piloting, automatic draining, or integrated pressure gauges.

- Always verify the valve s compatibility with your specific fluid type and system pressure.

- Install a filter upstream to protect the valve from contaminants.

- Follow Teledyne s installation and maintenance guidelines to maximize lifespan.

- If in doubt, consult with a hydraulic or fluid power specialist to ensure the valve meets your exact requirements.

Details:

Model Number:1875-OL. Relief Valves. Pressure Regulator Valves.

part #: 1875 prices

• $46.00-$131.12

specifications valvesplumbing:

• brand: Teledyne
• mpn: 1875-ol
• part type: Valve
• set pressure: 200 Psi
• reference sku: 1766240
• product condition: Used Excellent

payments valvesplumbing:

• wallet: Paypal
• credit card: Diners-club
• other

general valvesplumbing:

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

seller valvesplumbing:

• # reviews: 128325
• rating: 100.0%
• city: Delta, Ohio

offer valvesplumbing:

• started: May 7, 2026
• options: Ship-to-home
• sold: 0
• availability: In Stock
• quantity: 1
• best offers: True

shipping valvesplumbing:

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

returns valvesplumbing:

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

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