Spirax-Sarco 70565 Steam Trap

The Spirax Sarco 70565, also identified as the RTA-125 3/4" Angle Steam Trap, is a heavy-duty thermostatic steam trap designed for low-pressure steam heating systems. Utilizing a precision-engineered balanced pressure bellows, this trap accurately differentiates between steam and condensate, ensuring rapid condensate removal and efficient air venting. The 3/4" NPT angle configuration simplifies installation in tight piping geometries, commonly found in radiator and convector applications. With a maximum operating pressure of 125 psig, its self-draining freezeproof design ensures reliable performance in cold-start conditions by remaining wide open when cold. This unit is self-adjusting across its entire pressure range, though it is critical to note that bellows-style traps are not suitable for superheated steam service or installations where significant condensate lift could lead to bellows fatigue. For contractors maintaining two-pipe steam systems, this trap provides consistent thermal efficiency and air handling capacity.

• High Air Venting Capacity: The thermostatic bellows naturally discharges air and non-condensable gases during start-up, preventing air binding in the system.
• Self-Draining Design: The 3/4 inch angle steam trap body prevents water holdup, mitigating the risk of freezing in unheated environments.
• Pressure Versatility: Operates consistently up to 125 PSI without the need for orifice changes or manual adjustments.
• Maintenance Accessibility: The angle pattern design allows for straightforward inspection and internal component replacement without disturbing main piping runs.

What is the maximum operating pressure for the Spirax Sarco RTA-125?
This thermostatic bellows trap is rated for a maximum saturated steam pressure of 125 psig. Operating above this threshold or in superheat conditions can cause permanent damage to the bellows element.

Can this steam trap be installed in a horizontal orientation?
The Spirax Sarco 70565 is an angle-pattern trap specifically designed for vertical inlet and horizontal outlet (or vice-versa) configurations typical of radiator returns to ensure proper condensate drainage.

How does the RTA-125 handle air binding?
Because the balanced pressure steam trap remains fully open when cold, it acts as a highly effective air vent during system startup, ensuring steam reaches the heat transfer surface rapidly.

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.