Spirax-Sarco 64161 Steam Trap

The Spirax-Sarco 64161 (Model B1H-75) is a heavy-duty, 3/4" FNPT inverted bucket steam trap engineered for high-efficiency condensate management in industrial steam systems. Built with a rugged ASTM A126 Class B cast iron body and a 5-inch face-to-face dimension, this trap is specifically designed for in-line horizontal piping layouts. It utilizes a mechanical leverage system where the high-strength stainless steel bucket responds to density differentials between steam and condensate, providing a reliable cyclic discharge. Rated for a maximum operating pressure (PMO) of 75 psig and temperatures up to 450°F, the B1H-75 is a standard choice for steam main drip stations, laundry equipment, and industrial dryers. Its internal stainless steel valve head and seat are hardened to resist water hammer and hydronic shock, ensuring long-term seat tight integrity. For installers, the dual-inlet/outlet configuration simplifies placement in tight manifolds while maintaining top-tier energy efficiency and air venting capabilities.

• Rugged Construction: Features a durable cast iron body and all-stainless steel internal mechanism to withstand harsh industrial steam environments.
• Water Hammer Resistance: The inverted bucket design is inherently resistant to damage from pressure surges and hydronic shock.
• Optimized Condensate Drainage: Specifically calibrated for systems with a 75 psi differential, ensuring continuous drainage without steam loss.
• Ease of Maintenance: Designed for in-line servicing, allowing technicians to inspect or replace the bucket mechanism without breaking pipe connections.

What is the maximum capacity of the B1H-75?
At its maximum differential pressure of 75 psi, this model can handle approximately 965 lbs/hr of hot condensate discharge.

Can this trap be installed in vertical piping?
No, the B1H series is designed strictly for horizontal installation to ensure the bucket moves vertically and maintains its water seal (prime).

How do I prevent "loss of prime" in this trap?
Loss of prime usually occurs during sudden pressure drops or when used on superheated steam. We recommend installing a check valve at the inlet to maintain the internal water seal.

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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.