Conbraco 27-402-01 Siphon Loop

The Conbraco 27-402-01 is a professional-grade 1/4" Male NPT brass steam gauge siphon loop engineered for high-pressure steam heating and industrial hydronic systems. This 90-degree angle mount siphon is constructed from heavy-gauge seamless brass tubing to provide a reliable thermal barrier between the live steam and sensitive instrumentation. By trapping condensate within the siphon loop, the 27-402-01 prevents high-temperature saturated steam from directly entering the Bourdon tube of your pressure gauge, protecting the internal mechanism from overheating and ensuring accurate, long-term steam gauge performance. Rated for 250 psig saturated steam and up to 400 psig at 100°F, this component is essential for any commercial boiler or process line where temperature isolation is required. The compact 90-degree configuration is specifically designed for tight mechanical spaces where a standard 180° pigtail would be obstructed, allowing for a clean, vertical installation that maintains a proper water seal.

• Thermal Protection: Forms a critical condensate seal that isolates the steam gauge from extreme process temperatures.
• High Pressure Rating: Built to handle 250 psig saturated steam and 400 psig liquid/air service at lower temperatures.
• Durable Construction: Heavy-gauge seamless brass resists corrosion and withstands the vibration common in industrial steam lines.
• Space-Efficient Design: The 90-degree angle allows for precise gauge orientation in condensed piping layouts.
• Standard Compatibility: Features 1/4" MNPT threading for seamless integration with standard pressure controllers and instrumentation.

Do I need to prime this siphon before operation?
Yes. For immediate protection, the loop should be filled with water prior to system startup. This ensures the initial surge of steam is blocked by a condensate barrier before it reaches the gauge.

Where is the 90-degree loop typically used compared to a 180-degree version?
The 90-degree model is utilized when the gauge must be mounted at a right angle to the process piping or when vertical clearance is limited, whereas the 180-degree (pigtail) version is standard for horizontal run-offs.

Can this be used for air or water service?
While primarily designed for steam to dissipate heat, it can be used in air or water applications to buffer pressure surges and pulsations that might otherwise damage the gauge internals.

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.