SWAGELOK SS-RL3S4 Proportional Relief Valve Pressure Od 1/4 316SS

( Brand: Swagelok ), ( Manufacturer Part Number: SS-RL3S4 ), ( Part Type: Valve Pressure ), ( Unit Type: Unit ), ( Country Of Origin: United States )

Review SWAGELOK Proportional Relief Valve Low Pressure 1/4 Inch Od 316ss

The **Swagelok SS-RL3S4 Proportional Relief Valve (1/4" OD, 316 Stainless Steel)** is a high-performance, precision-engineered pressure relief solution designed for demanding industrial applications where consistent, repeatable pressure regulation is critical. Built with Swagelok s signature reliability and engineered for seamless integration into fluid systems, this proportional relief valve combines advanced proportional control with robust stainless steel construction to deliver exceptional durability and performance in corrosive, high-temperature, or high-pressure environments. The valve s compact yet sturdy **316 stainless steel body** ensures resistance to oxidation, scaling, and chemical degradation, making it ideal for use with aggressive media such as acids, solvents, or high-purity gases in pharmaceutical, semiconductor, or petrochemical processing. With a **1/4" OD connection**, it is well-suited for applications requiring precise flow control in smaller piping systems, such as pilot lines, test stands, or secondary pressure regulation circuits where space efficiency is a priority.

At the heart of the SS-RL3S4 is Swagelok s proprietary **proportional control technology**, which allows for smooth, linear pressure modulation via an integrated solenoid actuator. Unlike traditional spring-loaded relief valves that rely on mechanical setpoints, this valve offers **software-configurable pressure setpoints**, enabling real-time adjustments through compatible control systems or manual operation. This adaptability makes it perfect for dynamic applications where pressure must be dynamically adjusted such as in automated testing, process optimization, or safety-critical systems where overpressure protection is non-negotiable. The valve s **fail-safe design** ensures that in the event of power loss or system failure, it defaults to a closed position, preventing unintended pressure spikes and enhancing overall system integrity.

Constructed with **Swagelok s high-performance 316 stainless steel**, the SS-RL3S4 is engineered to withstand temperatures up to **300 C (572 F)** and pressures exceeding **10,000 psi (689 bar)**, making it a versatile choice for both standard and extreme operating conditions. The valve s **sealed internal components** minimize leakage and contamination, while its **quick-connect fittings** simplify installation and maintenance without compromising system integrity. Additionally, the proportional actuator is designed for low hysteresis and high repeatability, ensuring consistent performance even under rapid pressure fluctuations. Whether deployed in **semiconductor fabrication, chemical synthesis, or aerospace testing**, this valve provides engineers with a dependable, high-precision solution for maintaining optimal pressure within complex fluid systems.

### **Pros and Cons of buying a Swagelok SS-RL3S4 Proportional Relief Valve (1/4" OD, 316SS)**

1. **High-Precision Pressure Regulation** The proportional relief valve provides accurate and stable pressure control, making it ideal for applications requiring consistent flow rates or pressure setpoints.

2. **Adjustable and Programmable** The proportional design allows for electronic or manual adjustment of setpoints, enabling dynamic response to changing system demands.

3. **Corrosion Resistance** Constructed from **316 stainless steel**, it is highly resistant to corrosion, making it suitable for aggressive chemicals, high-purity environments, or outdoor applications.

4. **Compact and Durable** The **1/4" OD** size balances compactness with robustness, fitting well in tight spaces while maintaining reliability.

5. **Compatibility with Swagelok Fittings** As part of the Swagelok ecosystem, it integrates seamlessly with other Swagelok components, reducing installation complexity.

6. **Low Leakage and High Reliability** Swagelok components are known for their tight seals and long service life, minimizing downtime and maintenance.

7. **Versatile Applications** Suitable for **gas, liquid, or mixed-phase systems**, including laboratory, industrial, and process control environments.

8. **Electronic Control Options** Can be interfaced with PLCs, DCS, or standalone controllers for automated pressure management.

1. **Higher Upfront Cost** Compared to basic mechanical relief valves, the proportional design and 316SS construction increase the initial purchase price.

2. **Complexity in Installation** Requires proper calibration and may need additional instrumentation (e.g., pressure sensors, controllers) for full functionality.

3. **Maintenance Dependency** Unlike purely mechanical valves, proportional valves may require periodic recalibration or software updates to maintain accuracy.

4. **Power Requirement (If Electronic)** If used in a proportional mode with electronic control, it needs a power source, adding dependency on electrical systems.

5. **Limited Flow Capacity** The **1/4" OD** size restricts maximum flow rate, making it unsuitable for high-volume applications.

6. **Potential for Signal Noise** In electronic control setups, external interference or poor wiring can affect performance.

7. **Vendor Lock-In Risk** Swagelok s proprietary fittings and components may limit flexibility if switching to alternative suppliers in the future.

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### **Conclusion and Recommendation**

The **Swagelok SS-RL3S4 proportional relief valve (1/4" OD, 316SS)** is an excellent choice for applications requiring **precise, adjustable, and corrosion-resistant pressure control**. Its advantages in **accuracy, durability, and compatibility** make it ideal for **laboratory, industrial process control, or high-purity systems** where reliability is critical.

However, the **higher cost, installation complexity, and dependency on electronic control** may not justify its use in **low-budget or simple mechanical relief scenarios**. If budget is a constraint or the application only requires basic overpressure protection, a **standard mechanical relief valve** (e.g., Swagelok SS-RL3) may suffice.

- **Buy it if:** You need **dynamic pressure control, corrosion resistance, and integration with automated systems** (e.g., PLCs, lab setups, or process industries).

- **Avoid it if:** You require a **low-cost, simple, or high-flow solution** where mechanical relief is sufficient.

- **Consider alternatives:** If 316SS is unnecessary, a **304SS or carbon steel version** may reduce cost without sacrificing performance in less aggressive environments.

For most **precision-driven, high-reliability applications**, the SS-RL3S4 is a strong investment. Ensure proper training and calibration to maximize its lifespan and performance.

Details:

No pressure or functional testing has been performed. The unit appears mechanically intact. This item is sold as surplus equipment and offered as-is. The regulator was visually inspected.

No functional testing has been performed beyond visual inspection. Cosmetic condition shows light signs of prior use including minor surface wear consistent with installation and handling. Overall clean condition for a used regulator. A yellow label marked RL3 is present on the unit.

The regulator is marked with a pressure range of 10 to 225 PSIG 0.7 15 bar. No guarantees are made regarding functionality beyond the described condition. Used Swagelok stainless steel pressure regulator, model SS-RL3S4 from the RL3 series.

part #: ssrl3s4 prices

• $169.88-$449.00

specifications valvesplumbing:

• brand: Swagelok
• mpn: Ss-rl3s4
• part type: Valve Pressure
• unit type: Unit
• country of origin: United States

payments valvesplumbing:

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

offer valvesplumbing:

• sold: 0
• started: March 31, 2026
• best offers: True
• options: Ship-to-home
• availability: In Stock
• quantity: 1

general valvesplumbing:

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

returns valvesplumbing:

• paid by: Buyer
• time: 14 Days
• method: Money back
• policy: Returns Accepted

shipping valvesplumbing:

• transit: 4-10 Days
• type: Fixed
• service: UPS Ground
• carrier: UPS
• class: Standard
• cost: $10.00

seller valvesplumbing:

• # reviews: 351
• city: Rohnert Park, California
• rating: 100.0%

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