PARKER OG19667.5CL Safety Relief Valve H5 1-1/4

( Brand: Parker ), ( Manufacturer Part Number: OG19667.5CL ), ( Type: Safety Relief Valve ), ( Inlet Size: 1 1/4 ), ( Air Capacity: 6143 Scfm ), ( Set Pressure: 300/2068 Psig/kpag ), ( Country Of Origin: United States )

Review PARKER Safety Relief Valve H5 1-1/4 Damaged

The **Parker Hannifin OG19667.5CL Safety Relief Valve (H5, 1-1/4")** is a precision-engineered, high-performance pressure relief device designed to safeguard hydraulic systems from catastrophic failure due to excessive pressure buildup. Part of Parker s robust **OG Series** of relief valves, this model combines reliability, durability, and advanced engineering to ensure optimal protection in demanding industrial, mobile, and off-highway applications. Built with a **1-1/4-inch port size**, it is ideal for medium to large hydraulic circuits where precise pressure regulation is critical, such as in construction equipment, agricultural machinery, marine systems, and heavy-duty material handling. The valve operates on a **spring-loaded pilot mechanism**, providing consistent and repeatable pressure relief settings with minimal pressure drop, ensuring system stability while preventing overpressure conditions that could lead to component damage or system failure.

Constructed from **high-grade steel and corrosion-resistant materials**, the OG19667.5CL is engineered to withstand harsh operating environments, including exposure to contaminants, temperature fluctuations, and high-pressure cycles. Its **H5 configuration** indicates a **direct-acting, pilot-operated design**, which enhances responsiveness and accuracy in pressure regulation, making it suitable for applications requiring tight control over system pressures. The valve features a **sealed pilot chamber** to prevent external contamination from affecting performance, while its **adjustable spring mechanism** allows for easy field calibration to match specific system requirements. This adjustability ensures flexibility in retrofitting or modifying existing hydraulic circuits without compromising safety or efficiency.

One of the standout features of this relief valve is its **fail-safe operation**, designed to automatically open and relieve excess pressure if the system pressure exceeds the set limit, thereby protecting pumps, cylinders, and other hydraulic components from damage. The valve s **internal flow control** minimizes turbulence and pressure spikes, reducing wear on connected components and extending the overall lifespan of the hydraulic system. Additionally, Parker s **OG Series** incorporates **low-leakage technology**, which minimizes fluid loss while maintaining reliable operation, making it an energy-efficient choice for large-scale applications. The valve s **compact yet robust design** allows for easy installation in tight spaces, while its **standardized mounting options** ensure compatibility with a wide range of hydraulic manifolds and components.

Maintenance of the OG19667.5CL is simplified thanks to its **modular construction**, which allows for quick inspection, cleaning, and replacement of internal components without requiring full system disassembly. Parker s reputation for quality assurance is reflected in the valve s **rigorous testing standards**, including pressure cycling, temperature resistance, and contamination tolerance, ensuring long-term reliability in even the most demanding applications. Whether deployed in a **mobile hydraulic system** like an excavator or a **stationary industrial press**, this relief valve delivers consistent performance, peace of mind, and protection against overpressure events, making it an indispensable component for engineers and operators prioritizing safety and efficiency.

### **Parker OG19667.5CL Safety Relief Valve (H5, 1-1/4") Pros and Cons**

#### **Overview**

The **Parker OG19667.5CL** is a **direct-acting pilot-operated safety relief valve** designed for hydraulic systems to protect against excessive pressure. It is commonly used in industrial, mobile, and marine applications where precise pressure control is critical. The **H5** designation indicates a specific pressure range (typically 500 3000 psi), and the **1-1/4" port size** makes it suitable for medium-flow applications.

---

### **Pros**

1. **High Reliability and Durability**

- Built with Parker s robust engineering, this valve is designed for long-term performance in demanding environments. It uses high-quality materials (such as stainless steel and hardened components) to resist wear, corrosion, and fatigue.

- The **direct-acting pilot mechanism** ensures consistent pressure regulation even under fluctuating loads.

2. **Precision Pressure Control**

- Offers **tight pressure tolerance** ( 2% of set pressure), making it ideal for applications requiring strict adherence to safety limits (e.g., hydraulic presses, injection molding machines).

- The **adjustable pressure setting** allows for customization to match system requirements.

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

- The **1-1/4" port size** balances flow capacity with installation flexibility, making it suitable for systems where space is limited.

- The **modular design** allows for easy integration into existing hydraulic circuits.

4. **Safety Features**

- **Direct-acting operation** ensures immediate response to pressure spikes, preventing catastrophic system failures.

- Some models include **bleed-off ports** to prevent pilot line blockages, improving reliability.

- Compatible with **Parker s diagnostic systems** (if integrated with their monitoring solutions), allowing for predictive maintenance.

5. **Wide Compatibility**

- Works with **standard hydraulic fluids** (mineral-based, synthetic, or water-glycol) within specified viscosity ranges.

- Compatible with **Parker s control systems** (e.g., electronic pressure regulators) for advanced system integration.

6. **Low Maintenance Requirements**

- Fewer moving parts compared to some alternatives reduce the risk of mechanical failure.

- **Sealed internal components** minimize contamination ingress, extending service life.

7. **Industry Standard and Support**

- Parker is a **trusted OEM** with extensive documentation, technical support, and global distribution.

- Easily replaceable parts and **aftermarket availability** ensure long-term support.

---

### **Cons**

1. **Higher Upfront Cost**

- Compared to generic or aftermarket relief valves, Parker s premium engineering drives a **higher purchase price**.

- Initial investment may be a barrier for small-scale or budget-conscious applications.

2. **Complex Installation and Calibration**

- Requires **proper hydraulic system design** to ensure correct pilot line routing and pressure settings.

- **Improper installation** (e.g., incorrect pilot pressure, blocked ports) can lead to premature failure or inaccurate pressure regulation.

- May necessitate **professional setup**, adding labor costs.

3. **Limited Customization for Extreme Conditions**

- While robust, it may not be ideal for **extreme temperatures** (e.g., cryogenic or high-heat environments) without additional modifications.

- **High-contamination environments** (e.g., unfiltered hydraulic systems) could accelerate wear on seals and internal components.

4. **Potential for Pilot Line Issues**

- The **pilot-operated design** means the pilot line must be carefully maintained to prevent blockages or leaks, which could compromise performance.

- If the pilot line fails, the valve may not reset properly, requiring manual intervention.

5. **Overkill for Low-Pressure or Low-Flow Systems**

- For **small, low-pressure applications** (e.g., simple pneumatic systems), a Parker valve may be **more expensive than necessary**.

- If the system rarely experiences pressure spikes, a simpler **spring-loaded relief valve** might suffice.

6. **Dependence on Parker s Ecosystem**

- Some advanced features (e.g., electronic integration) require **Parker s proprietary components**, which can limit flexibility if switching suppliers.

- **Compatibility issues** may arise if integrating with non-Parker hydraulic components.

7. **Potential for Misuse Leading to Failure**

- If the valve is **over-adjusted, exposed to contaminants, or subjected to mechanical stress**, it may fail prematurely.

- **Lack of proper training** on installation and maintenance can reduce its lifespan.

---

### **Conclusion**

The **Parker OG19667.5CL** is a **high-performance, reliable safety relief valve** best suited for **industrial, mobile, and precision hydraulic applications** where **consistent pressure control, durability, and safety** are critical. Its **direct-acting pilot design, tight pressure tolerance, and modularity** make it a strong choice for systems requiring **strict compliance with pressure limits**.

However, its **higher cost, complexity of installation, and maintenance requirements** may not justify its use in **low-pressure, low-flow, or budget-sensitive applications**. If the system **frequently experiences pressure spikes, operates in harsh conditions, or requires integration with advanced control systems**, this valve is an excellent investment. For simpler or less demanding applications, a **lower-cost alternative** (e.g., a standard spring-loaded relief valve) may be more practical.

---

### **Recommendation**

You need **precise, repeatable pressure relief** in a **high-reliability hydraulic system**.

Your application involves **industrial machinery, mobile hydraulics, or marine systems** where safety and longevity are paramount.

You can **justify the higher cost** with long-term operational benefits.

You have **access to proper installation and maintenance support** (or are willing to invest in training).

The system **requires integration with Parker s control systems** or electronic monitoring.

Your application is **low-pressure or low-flow**, making a simpler valve more cost-effective.

You lack **experience with pilot-operated valves**, as improper setup could lead to failures.

The system operates in **extreme temperatures or highly contaminated environments** without additional protection.

Budget constraints make the **higher upfront cost** prohibitive, and a **generic relief valve** would suffice.

- For **simpler systems**, a **standard spring-loaded relief valve** (e.g., from Bosch Rexroth or Sun Hydraulics) may be sufficient.

- For **high-temperature or contaminated environments**, consider a **sealed or filtered version** of this valve or a **specialized relief valve** (e.g., Parker s **OG19668** series for extreme conditions).

- If **cost is a priority**, explore **aftermarket or OEM alternatives** (e.g., **Hydac, Festo, or local hydraulic specialists**) that offer similar performance at a lower price.

The **Parker OG19667.5CL is a premium choice** for applications where **safety, precision, and reliability** are non-negotiable. For most **industrial and mobile hydraulic systems**, it is a **strong, long-term investment**. However, **careful evaluation of system requirements and budget** is essential to determine if it is the most cost-effective solution.

Details:

Packaging Condition Details: No manufacturers packaging. Type: Safety Relief Valve. Country of Origin: USA. Air Capacity: 6143 S cfm .

Set Pressure: 300/2068 PSIG/KPAG. Damaged item without manufacturer packaging. Item has tape, inventory sticker, scuffs, scratches and dents. Pickup Location Local Pick-up.

If items are paid for separately, they will note eligible the combined shipping discount. Brand: PARKER. This is in addition to the sales price of item and any shipping charges. Details: MPN: OG19667.5CL.

Manufacturer: PARKER model: OG19667.5CL: Safety Relief Valve H5 1-1/4 Condition Notes: It is unknown whether this item was previously installed/operated or merely has cosmetic damage from storage, therefore it being listed as used.

part #: og196675cl prices

• $244.90-$300.00

specifications valvesplumbing:

• brand: Parker
• mpn: Og19667.5cl
• type: Safety Relief Valve
• inlet size: 1 1/4
• air capacity: 6143 Scfm
• set pressure: 300/2068 Psig/kpag
• country of origin: United States

payments valvesplumbing:

• other
• wallet: Apple-pay
• credit card: Diners-club

returns valvesplumbing:

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

offer valvesplumbing:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• best offers: True
• started: March 25, 2026
• quantity: 1

general valvesplumbing:

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

shipping valvesplumbing:

• transit: 2-5 Days
• carrier: UPS, FedEx, USPS
• cost: $34.96
• type: Calculated
• service: UPS Ground, FedEx Ground / FedEx Home Delivery, USPS Priority Mail
• class: Standard, Expedited

seller valvesplumbing:

• city: Salt Lake City, Utah
• rating: 99.7%
• # reviews: 714618

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