3
YARWAY SERIES 129Y-III, 29S DISC TRAP
INSTRUCTION, OPERATION AND MAINTENANCE MANUAL
Problem:
Trap fails to pass condensate.
Corrective action:
1. Check the stop valves and check valves
to assure they are open.
2. Check the strainer for clogging. Blow down
strainer or block off pressure, vent line, and
clean strainer screen.
3. Clogged valve port. Block off pressure, vent
trap. Remove bonnet and inspect ports.
If clogged, clean trap without damaging seat
surface. Reassemble and torque bonnet to
following torque values:
Problem:
Trap fails to close-blows steam or
rapid cycles.
Corrective action:
1. Dirt on valve seat. Block off and vent
pressure. Remove bonnet. Carefully clean
seat, bonnet and disc. Do not use abrasives.
Reassemble and re-torque (See 3 above) if
wear is apparent, replace trap.
2. Check backpressure to assure it does not
exceed limit for size being used.
Series
Size Bonnet (Nm)
(inch) HEX Torque
129Y-III ⅜",½"
¾",1"
32
46
44~48
98~108
29S ¼" 26 13~15
Series
Size Screen cap (Nm)
(inch) HEX Torque
129Y-III ⅜",½"
¾",1"
27
38
147~162
183~202
29S ¼" 21 59~65
WARRANTY
1. Warranty period
The warranty period is one year from
the date of shipment to the first user.
2. Scope
All items that we manufacture are
warranted to be free from defects in
material and workmanship and to conform
to the specifications, if any. Seller’s liability
shall be limited to repair or replacement.
3. Exemption
No warranty is given for products or
components in the following cases.
1. Product failure due to incorrect
installation and operation by the user.
2. Product failure due to contamination
such as dust, scale, carbon or scraps.
3. Product corrosion due to water quality.
4. Product failure due to user’s error in
disassembly and/or inspection.
5. Force majeure.
6. In case that the cause of the problem
cannot be identified due to disposal, etc.
7. Other possible cases such as water
hammer, which the seller disclaims
warranty.
VCIOM-15469 © 2020 Emerson Electric Co. All rights reserved 06/20. 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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