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Yarway Series 731/741 Repairable Drip and Tracer Steam Traps

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. The internals shall be stainless steel contained in a factory set and assembled renewal capsule.

Specify trap size, series number, internals and end connections. Example: 3/4” 741CL NPT.

Design: ANSI Class 600
Operating: 20-300 psi, 750°F
Back pressure: to 40% of inlet psia
Design: ANSI Class 600
Operating: 40-600 psi, 750°F
*Back pressure:
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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