Repairable Drip and Tracer Steam Traps Series 731/741
The Series 731/741 UniBody Plus variable orifice (piston) traps are designed for applications to 600 psi. The “A” internals are designed for light load applications such as steam tracing and drip. The “B”, “C” and “E” internals are designed for the heavier process loads. The solid metal internals respond quickly to the presence of condensate, air and noncondensible gases.
Two body styles and factory settings are available. Both the 741 and 731 bodies are straightway, accepting the same renewal capsules. The 741 body contains an integral wye strainer and blow-off valve.
The factory settings are “L” for operating pressures to 300 psi and “H” to 600 psi.
Applicable Codes and Standards
Pressure ratings per ANSI/FCI-69-1. Performance testing per ANSI/ASME PTC-39.1. End connections per ANSI B.20.1 for threaded ends, per ANSI B16.11 for socket- welding ends.
How to Specify and Order
Typical Specification – Trap shall be piston valve, impulse type. The body shall be forged low carbon (0.15 max. C) chrome-moly steel with threaded (or socketwelding) ends.
Ratings 731L/741L Design
Operating *Back pressure:
Operating L *Back pressure:
ANSI Class 600 20-300 psi, 750°F to 40% of inlet psia
ANSI Class 600 40-600 psi, 750°F to 25% of inlet psia
*For back pressure to 55% and/or operation to 10 psig, remove the split washer (Part No. 5)
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