MIYAWAKI AGH50 Ball Float Air Drain Trap User Manual

MIYAWAKI AGH50 Ball Float Air Drain Trap

The model AGH50 is a cast steel ball float air (gas) drain trap. 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.

WARNING
Failure to observe this type of precaution may lead to serious injury or death.

CAUTION
Failure to follow this type of precaution can lead to injury or damage to equipment and property.

SPECIFICATIONS AND MARKINGS

WARNING
Be sure not to use this product at higher pressures than the specified maximum allowable pressure (PMA) or at temperatures higher than the specified maximum allowable temperature (TMA). The following items are displayed on the name plate or the side of the product. Check each item to avoid misuse of the product.

1. Maximum allowable pressure (PMA): 3.2 MPa (464 psig)
2. Maximum allowable temperature (TMA): 400°C (752°F)
3. Maximum differential pressure (⊿PMX): AGH50-5: 0.5MPa (72 psig)
4. AGH50-10 : 1.0MPa (145 psig)
5. AGH50-20 : 2.0MPa (290 psig)
6. AGH50-32 : 3.2 MPa (464 psig)
7. Maximum operating temperature (TMO): 400°C (752°F)
8. Size : 50mm (2″), 65mm (1-1/2″), 80mm (3″), 100mm (4″)
9. Serial number : Showing the year and date of production
10. Flow direction : Shown by an arrow.
11. Body material : Cast Steel WCB
12. Model symbol : Showing the product model name

Refer to the leaflet for details about dimensions and other specifications. Classification according to PED 97/23/EC Fluid group 2 The model AGH50 fully complies with the requirements of the European Pressure Equipment Directive 97/23/EC. It belongs to the category II of the PED. The product will carry the CE marking and the conformity with the PED will be confirmed by issuing a declaration of conformity.

CONSTRUCTION DETAILS

1. Body
2. Cover
3. Float
4. Holder
5. Valve
6. Pin
7. Lever
8. Collar
9. Washer
10. Holder Bolt
11. Pin
12. Cover Gasket
13. Connection Gasket
14. Body Plug
15. Valve Seat
16. Bush
17. Cover Bolts, Nuts
18. Holder Gasket
19. Nut
20. Pin
21. Stopper
22. Bolt
23. Connection Bolts, Nuts
24. Flange
25. Reducer or Pipe
26. Flange
27. Screen
28. Spacer
29. Name Plate
30. Rivet
31. Plate
32. Eye Bolt
33. Pipe
34. Flange

INSTALLATION

WARNING
Pay very careful attention when working in hazardous environments. There is a risk of explosion and the possibility of dangerous gases leaking. Always check whether the pipeline contains flammable, high pressure or high temperature materials before starting to work. Make sure that isolation valves are installed on both the upstream and downstream lines.

CAUTION
Before installing the product, open both isolation valves and the bypass valve, if one exists, to blow out any debris or dirt inside the pipeline. After blowing out the line, before starting to work, close the isolation valves and allow time for the temperature to drop to a safe working temperature. When installing the product, be sure to leave clearance for maintaining it.

1. Remove the dustproof seals covering both connections.
2. Check the flow direction indicated on the side of the body.
3. When installing an AGH50, install it so that the flow from the upstream line to the downstream line is horizontal and the “TOP” label or the name plate is on the top side of the body. Install the AGH50 at the end of a pipe that is angling down, so that condensate flows into the drain trap easily.
4. Open the isolation valve on the upstream line slowly and make sure the product works normally.

AGH50 model

How to install the pressure-balancing lines

1. a ) Proper installation line
2. b) Wrong installation line

The drain will stay in the globe valve and the Y type strainer fitted upstream of drain trap. Neither air nor the drain is substituted, so the drainage from the drain trap is not done.

MAINTENANCE

CAUTION
When replacing parts, make sure the replacement parts are supplied by Miyawaki. The performance of drain traps deteriorates gradually over time due to wear, corrosion or dirt accumulating around the valve and the valve seat. To keep air (gas) control systems and equipment working well, periodic maintenance of drain traps is essential.

Repairs
When a trap fails, it is necessary to clean the internal parts and to replace damaged parts. Below are steps to disassemble a failed trap.

Disassembling the trap

1. Remove the cover (2) by taking off the nuts (19) from the body (1). The internal parts are installed on the cover (2).
2. Remove the holder bolt (11) to remove the inner unit and holder gasket (20) from the cover (2).
3. Clean the internal parts. Handle the valve (6) and valve seat (17) with care. Avoid scratching or dropping the parts.
4. Use fine sandpaper, non-woven polishing or waste cloth to remove any scale or rust found on the valve (6) or valve seat (17).

Removing the screen

1. Remove the connection flange by taking off the nuts (25) from the body (1).
2. Remove the screen (31).
3. Clean the screen (31).

After repairing the trap, re-assemble the parts in reverse order as follows.

Replacing the gasket

1. After disassembling the trap, make sure that both cover gaskets (14), connection flange (15) and gasket (20) are replaced with new.
2. When removing rust and rubbish form the gasket, pay special attention not to damage gasket seat, and reinstall it.
3. When reassembling, pay special attention that foreign material such as scale or dirty is stuck between the gasket and the gasket seat surface.

Installing the screen

1. After cleaning, install the screen (31) back into the body (1).
2. If the screen is found damaged, replace it with new.

Reassembling the trap

1. Set the holder gasket (20) on the cover (2) and install the inner unit after the holder gasket (20).
2. Tighten the holder bolt (11) to secure the inner unit on the cover (2).
3. Set the cover gasket (14) on the body.
4. Attach the cover (2), with the installed inner unit, to the body (1) in the way that the “TOP” label is facing the top. Secure it by tightening with 10 nuts (19).
5. Set the connection gasket (15) on the body.
6. Attach the connection flange to the body (1) and secure it by tightening with 8 nuts (25).
7. Make sure to tighten the bolts in a crosswise pattern, to avoid uneven tightening.

The torque for each part is shown in the following table.

AGH50 model

• 1. Body
• 2. Cover
• 3. Float
• 8. Lever
• 11. Holder Bolt
• 14. Cover Gasket
• 16. Body Plug
• 19. Cover Bolts, Nuts
• 20. Holder Gasket
• 21. Nut
• 25. Connection Bolts, Nuts

TROUBLESHOOTING

dirt is stuck between the

valve and the valve seat.

| Clean the valve and the valve seat.
The valve and/or the valve seat are damaged, worn or corroded.| Replace the valve and/or the valve seat.
The holder gasket (20) is damaged.| Replace gasket.
The holder bolt (11) is loose.| Retighten the holder bolt.*1
Wrong installation position| Change the installation so that the name plate is on the top side of the body.
Wrong installation direction| Make sure the arrow on the main body matches the flow

direction of the fluid.

Air (gas) leaks from the body.| From between the body and body cover| The cover nuts are loose.| Retighten them.*2
Damage, erosion or deterioration of the cover gasket| Replace the cover gasket.
Damage, erosion or deterioration of the cover gasket (14)| Replace the cover gasket.
The gasket sealing surface on the body or bottom cover is

damaged.

| Replace the body with a new one, or replace the bottom

cover.

From between the body and flange| The Connection nuts are

loose.

| Retighten them.*3
Damage, erosion or deterioration of the connection gasket| Replace the connection gasket.
The gasket sealing surface on the body or connection flange

is damaged.

| Replace the body with a new one, or replace the connection

flange.

From between the body and

plug

| The plug is loose.| Retighten the plug.
The gasket sealing surface on the body or plug is damaged.| Replace the body with a new one, or replace the plug.
Insufficient condensate discharged, or no condensate discharged.| Foreign material such as a scale or dirt is stuck in the valve seat.| Clean the valve seat.
The installation position is wrong.| Change the installation with the pressure-balancing line connecting from the top.
The float is damaged.| Replace the float.
Installing the pressure-

balancing line is wrong

| Correct the installation line.
The pressure for saturated steam service was over the specified maximum operating

pressure.

| Lower the pressure or replace the trap with one that has a higher maximum operating

pressure.

Insufficient condensate

capacity.

| Replace the trap with a larger

capacity trap.

1, 2and *3: Refer to the torque table in Section 4, “Maintenance” to retighten the parts to the correct torque

WARRANTY

Warranty period
The warranty period shall last twelve (12) months from the date of product delivery.

Details of the warranty
If the product stops working correctly within the warranty period, we will repair or replace the product free of charge if the cause of the trouble is not one of the following items.

1. The precautions described in this manual were not observed.
2. User’s errors or mistakes such as an inappropriate installation or incorrect handling, or an excessively large impact caused by dropping
3. Problems caused by devices or equipment other than ours, or a disallowed use environment
4. When a repair or modification has been performed by anyone other than us or people who are authorized to make such repairs
5. Intrusion of salt or other substances that promote significant rust or corrosion or problems from fluids that contain the same substances
6. Extremely worn gaskets or other parts
7. Attachment or accumulation of foreign matter in the pipe, such as dust and scale
8. Problems from fires, natural disasters, or other force majeure which is not our responsibility

Warranty limitation
The remedy available under the warranty shall not exceed the sales price of the products delivered, for any cause whatsoever.

SERIAL NUMBER（S. No.）DESIGNATION

Month designation system

Day designation system

Example of serial number designation
1 7 1 1 → Jan 1, 2017 29XM → Oct 21, 2029

GUIDANCE FOR READING SPECIAL PRODUCT NAME

Symbol description

• For any questions about the product that you purchased or about the details in this user’s manual, please contact the following.
• © 2017 MIYAWAKI INC. This user’s manual may not be reproduced or copied in whole or in part, without the written consent of MIYAWAKI INC.
• 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 place where you purchased.

INTERNATIONAL SALES DEPT.
2-1-30, Tagawakita, Yodogawa-ku, Osaka, 532-0021, Japan Tel: +81-6-6302-5549

www.miyawaki.net e-mail: export@miyawaki- inc.co.jp

References

• MIYAWAKI INC.
• Home | Miyawaki - Specialist in Steam Traps

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