Sensus 138-18-021-01 Spring

When you're servicing or upgrading a Sensus 243-RPC regulator, precision in your spring selection is what prevents callback-heavy issues like pressure drift or poor lock-off performance. The Sensus 138-18-021-01 White Spring is the industry standard for technicians needing a reliable 1 to 5 PSI outlet pressure range. This heavy-duty RPC pilot spring is specifically engineered to handle the unique relay-action requirements of the Sensus-Gas Division pilot-operated systems, ensuring the main valve reacts with the appropriate speed to downstream demand changes.

Whether you're working on a district regulator station or a high-precision industrial meter set, using this white color-coded spring ensures the pilot maintains the ±0.5% absolute pressure accuracy these units are known for. Designed for use with non-corrosive gases like natural gas, LPG, and nitrogen, the 138-18-021-01 is a direct OEM replacement part that fits perfectly within the pilot assembly, eliminating the guesswork of field calibrations. Always ensure your control line is properly sloped and the inlet pressure is at least 1.5 PSIG higher than your target outlet setpoint to maintain optimal regulation.

• Precise Pressure Control: Specifically calibrated for the 1-5# PSI range, facilitating exceptionally accurate setpoints in Sensus 243-RPC pilot-operated regulators.
• Reliable Performance: Robust construction minimizes fatigue, preventing setpoint migration over time in demanding industrial environments.
• OEM Compatibility: Genuine Sensus 138-18-021-01 part ensures exact fitment and maintains the original technical specifications of your equipment.
• Broad Application: Suitable for a variety of non-corrosive gas services, including air, dry CO2, and propane.

What is the maximum pressure range for the Sensus white spring?
The 138-18-021-01 white spring is designed for a specific outlet pressure range of 1 to 5 PSI. If your application requires a higher or lower PSI, you must select a different color-coded spring to avoid compromising the regulator's accuracy.

Is this spring compatible with the standard 243-8 or 243-12 models?
No, this spring is specifically for the RPC (Relay Pressure Control) pilot-operated models. Standard 243 models utilize different spring geometries and tension rates. Always verify your regulator model plate before installation.

Does the spring color-coding follow a universal HVAC standard?
No, color-coding is manufacturer-specific. In the Sensus 243-RPC series, white specifically indicates the 1-5 PSI range, whereas black or gray springs cover different pressures within the same regulator body.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.