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MIYAWAKI S31N User Manual

Thermodynamic steam trap
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THERMODYNAMIC STEAM TRAP
USER'S MANUAL

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Summary of Contents for MIYAWAKI S31N

  • Page 1 THERMODYNAMIC STEAM TRAP USER'S MANUAL...

  • Page 2: Table Of Contents

    SAFETY GUIDE The model S31N is a disc-type steam trap equipped with an automatic blow-off mechanism. In order to get maximum benefit from this product, be sure to read this manual before installing it. The following warnings and cautions are shown at appropriate places in this manual.

  • Page 3: Specifications And Markings

    1 ¼” – 2” (32 – 50 mm) - Cast iron FC250 Model symbol: Showing the product model name  Some pictures and illustrations in this manual are examples of the model S31N. For more details regarding dimensions and other specifications, please refer to the catalog.

  • Page 4: Construction Details

    CONSTRUCTION DETAILS 15A, 20A, 25A (37) Body Cover Seat Disc (39) (38) Screen Plug (11) 10. Seat Gasket (13) 11. Cap Gasket 13. Seat Gasket (10) 14. Plug Gasket 37. Name Plate 38. Bimetal 39. Stopper Ring (14) 32A, 40A, 50A Body Cover (37)

  • Page 5: Installation

    2) Check the flow direction indicated on the side of the body. 3) The S31N can be used for both horizontal and vertical lines. However, when installing a S31N in a horizontal line, be sure to maintain a slight slope to the line, so that any condensate will flow smoothly.

  • Page 6: Operation

    4 OPERATION CAUTION Before starting operation, open the bypass valve or blow valve completely and blow off the scale in the piping. 4.1 Operation procedure 1) After blowing off the scale from the piping, close the bypass valve or blow valve. 2) Open the stop valve on the trap outlet side.

  • Page 7: Maintenance

    CAUTION  When replacing parts, make sure the replacement parts are supplied by MIYAWAKI. The performance of steam traps deteriorates gradually over time due to wear, corrosion or dirt accumulating around the valve and the valve seat. Please conduct periodic diagnosis of traps in order to keep steam control systems and equipment working well.
  • Page 8 5.2 Repairs When a trap fails, it is necessary to clean the internal parts and to replace damaged parts. Take the failed trap apart following the steps below. 15A, 20A, 25A 5.2.1 Disassembling the trap 1) Remove the cover (2) by turning it clockwise until the ● mark on the side of the cover is centered over the ●...
  • Page 9 32A, 40A, 50A 5.2.5 Disassembling the trap 1) Remove the four cover bolts (12) and washers (13), and remove the cover (2). 2) Remove the cap (3), and take out the disc (4), stopper ring (21), bimetal (20), and cap gasket (11).
  • Page 10 (12) (38) (37) (37) (13) (5) (11) (11) (39) (38) (21) (20) (3), (10), (13) (10) (15) (14) (14) 15A, 20A, 25A 32A, 40A, 50A 15A, 20A, 25A 14. Plug Gasket Screen Body 37. Name Plate Plug Cover 38. Bimetal 10.

  • Page 11: Troubleshooting

    TROUBLESHOOTING Problem Possible cause Solution Dirt is stuck around the disc Clean the disc (4) and the Steam leaks or blows (4) or the seat (3 for ½” – 1”; 5 seat (3 for ½” – 1”; 5 for 1 ¼” through.

  • Page 12: Warranty

    Problems caused by devices or equipment other than MIYAWAKI’s, or a disallowed use environment When a repair or modification has been performed by anyone other than MIYAWAKI or people who are authorized to make such repairs Intrusion of salt or other substances that promote significant rust or corrosion or problems from fluids that contain the same substances Consumable parts such as Packing, Gasket, O-ring, Diaphragm, etc.

  • Page 13: Serial Number (S. No.) Designation

    1 7 1 1 → Jan.1, 2017 2 9 X M → Oct. 21, 2029 ●For 9-digit display S.No. □□□□□□□□□ MIYAWAKI identification number Represents the month. Represents the year. (last two digits of the year according to the Western calendar) Example of serial number designation 1 7 1 1 2 C 0 2 0 →...

  • Page 14: Guidance For Reading Special Product Name

    9 GUIDANCE FOR READING SPECIAL PRODUCT NAME 〇〇〇-○○-□ Special symbol: The symbol applies only to special products (Please refer to table 1 for details) Model symbol: Product model number Table 1 Symbol description Suffix Special contents Trap for high-pressure gas installed property (only for Gas Trap) Blow valve attached Change of gasket Special face to face dimension...
  • Page 15  Some special specifications of the product you have, may found to be different from the ones in the user's manual. If you have any question, please contact MIYAWAKI, our local authorized agent, or the company where you purchased the product.
  • Page 16 MIYAWAKI GmbH Birnbaumsmühle 65, 15234 Frankfurt (Oder), Germany Tel: +49-335-4007-0097 www.miyawaki.de e-mail: info@miyawaki.de China Importer and Authorized representative: MIYAWAKI WEST Co., Ltd. Room 1705, No.1, Building No.311, Yanxin Road, Huishan Economic Development Zone, Wuxi, Jiangsu, China Tel: +86-510-8359-5125 www.miyawaki-inc.com.cn e-mail: mywkwest@miyawaki-inc.com.cn...

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