Spirax-Sarco 70589 Trap

The Spirax-Sarco 70589 is a heavy-duty RTH-125 Balanced Pressure Thermostatic Steam Trap designed for high-efficiency condensate removal in 1/2-inch straightway piping configurations. Engineered for commercial and industrial heating applications, this trap features a forged red brass body (ASTM B124 Alloy C3770) and a resilient stainless steel BP99 element. The precision-welded thermostatic capsule is self-adjusting across its entire operating range, effectively discharging air and non-condensable gases approximately 23°F below saturated steam temperature to prevent air binding and ensure rapid system start-up. Built to handle a maximum operating pressure of 125 PSIG and temperatures reaching 353°F, the Spirax Sarco RTH-125 is a standard-setting solution for two-pipe heating systems, radiators, and small process equipment like sterilizers and laundry units. Its 1/2" MNPT union inlet and FNPT outlet design allow for easy maintenance of internals without disturbing established piping connections, maintaining reliable steam trap performance in vacuum or vapor services.

Key Benefits:

• Self-Adjusting Operation: The balanced pressure thermostatic element automatically adapts to pressure fluctuations between 25" Hg vacuum and 125 PSIG for consistent performance.
• Industrial Grade Durability: Constructed with a stainless steel valve head and stainless steel seat to resist corrosion and water hammer in demanding environments.
• Efficient Condensate Drainage: Specifically tuned to discharge at sub-cooled temperatures, maximizing heat transfer in radiator steam trap applications.
• Ease of Service: The straight-through straightway pattern and union connection simplify the replacement of the capsule or seat assembly.

Common Questions:

Can the RTH-125 be used in vacuum heating systems?
Yes, this Spirax-Sarco steam trap is rated for vacuum service down to 25" Hg, making it suitable for modern vapor and vacuum two-pipe heating systems.

What is the difference between RTA-125 and RTH-125?
The RTA-125 features an angle pattern body, whereas the RTH-125 1/2 inch trap utilizes a straightway (straight-through) flow pattern to accommodate specific piping layouts.

How do I prevent the trap from failing due to debris?
For optimal HVAC steam system maintenance, a pipeline strainer should always be installed upstream of the trap to protect the stainless steel internals from pipe scale and dirt.

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.