Emerson B302 Manual

© 2019 Emerson. All rights reserved. VCIOM-12928-EN 22/08Emerson.com
YARWAY B302, B303, B318 AND B320 BIMETALLIC STEAM TRAPS AND AIR ELIMINATORS
SUMMARY OF INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Before installation, these instructions must be carefully read and understood.
INSTALLATION
• Before installation, remove plastic covers
placed on flanges or connection ends. The
equipment has an arrow for Inlet/Outlet
designations. Be sure that it is installed in the
appropriate direction.
• Install the steam trap at a point where the
condensate tends to accumulate. A strainer
can be installed upstream of the trap for
additional protection.
MAINTENANCE
• We recommend that the steam traps are
serviced as necessary. Steam traps should be
checked periodically (at least yearly), to verify
that they are operating correctly and to clean
the internal parts and strainer screen.
• When reassembling, make sure that all
gasket faces are clean and always use a new
gasket. Tighten cover bolts uniformly in a
diagonal sequence.
WARNING
At startup, the presence of small particles in the
water (dirt, scale, weld splatters, etc.) may cause
an imperfect closure of the seat. If this occurs,
clean the equipment accordingly.
Do not touch the equipment without appropriate
protection during operation because it may
conduct heat if the used fluid is at high
temperature.
Before starting maintenance, be sure that the
equipment is not pressurized or hot.
The equipment must be used within its pressure
and temperature limits, otherwise it might fail
(refer to nameplate or documentation).
Do not remove the nameplate attached to the
equipment. Serial number and other useful
information are stamped on it.
INSTALLATION POSITION
RECOMMENDED INSTALLATION
WRONG INSTALLATION

2
YARWAY B302, B303, B318 AND B320 BIMETALLIC STEAM TRAPS AND AIR ELIMINATORS
SUMMARY OF INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
VCIOM-12928-EN © 2019, 2022 Emerson Electric Co. All rights reserved 08/22. Yarway is a mark owned by one of the companies in the Emerson Automation
Solutions business unit of Emerson Electric Co. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their
prospective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed
by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time
without notice.
Emerson Electric Co. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of
any Emerson Electric Co. product remains solely with the purchaser.
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For additional information, please visit: https://www.emerson.com/en-us/catalog/yarway-p001408
RATINGS AND SPECIFICATIONS
Specification Series
B302 B303 B318 B320
Operating Principle Thermostatic
Type Bimetallic
Size ½" - 1" ½" - 1" 1½" - 2" ½" - 1" ½" - 1"
Maximum Operating Pressure (psig) 247 464 1233 1595
Maximum Operating Temperature (°F) 482 572 932 977
Nominal Flow (lb/h at 100 psi;
near saturation, unless otherwise noted) 1020 1158 303
Maximum Back Pressure
(% of inlet; based on absolute pressure) 99
Minimum Differential Pressure (psi) 7.3