Armstrong TVS-811S Trap Valve Station Instructions

: June 15, 2024
: ARMSTRONG

Table of Contents

Armstrong TVS-811S Trap Valve Station
Product Information
Product Usage Instructions
Operation
Troubleshooting
Replacing the Isolation Valve Assembly
Installing New Isolation Valve Assembly
CONTACT
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Armstrong TVS-811S Trap Valve Station

Product Information

Specifications:
- Model: IB-81 TVS-811 Series Trap Valve Station
- Valve Type: Piston Valve
- Sealing Mechanism: Valve sealing rings compressed by the bonnet
- Disc Springs: Flexible disc springs exert pressure on the valve sealing rings
- Special Tool: Part No. A9542 special valve sealing ring extractor tool
- Repair Kit: TVS-811 Isolation Valve Repair Kit Part No. B5249

Product Usage Instructions

Opening and Closing the TVS Isolation Valves
- Ensure the valve is in the closed position.
- If the bonnet is not seated on the body, tighten the bonnet nuts until the bonnet seats. This recompresses the valve sealing rings against the body and the valve plug.
- If the valve continues to leak, replace the isolation valve assembly.
Troubleshooting – Isolation Valves
- In case of leakage or other issues with the isolation valves, follow these steps:
- If there is leakage when the valve is closed, first check if the valve is closed. Then, check if the bonnet is seated on the body. If not, tighten the bonnet nuts until the bonnet seats. If the leakage persists, replace the isolation valve assembly.
- If there is stem leakage, repeat the steps mentioned above. Additionally, maintain the isolation valve as soon as leakage starts to prevent further damage. If leakage continues, the valve plug or valve sealing rings may need to be replaced.
- Caution: Before tightening the bonnet bolts, always ensure the isolation valve is in the closed position.
Replacing the Isolation Valve Assembly
- Note: Do not attempt to replace the valve sealing rings without Part No. A9542 special valve sealing ring extractor tool.
- Make sure to isolate the TVS811 Trap Valve Station both upstream and downstream by using separate shut-off valves before performing any maintenance.
- Using the TVS’s handwheels, open each valve fully until it stops.
- Loosen and remove the bonnet bolts.
- Pull the isolation valve assembly out of the valve body.
- Place the special valve sealing ring extractor into the body of the valve and turn the top square nut of the extractor tool with a wrench to allow the spindle to expand under the valve washer.
- Tighten the lower nut of the extractor and pull the extractor out of the valve body. The disc springs, valve sealing rings, and lantern bushing will come out on the end of the extractor. Check if all components, including the valve washer at the bottom of the valve body, have been removed. Inspect and clean any debris that might have remained in the valve body.
Installing New Isolation Valve Assembly
- Place the valve washer into the valve body with the beveled edge facing down.
- Insert Armstrong Part No. B5249 isolation valve assembly into the valve body.
- Lightly tap the isolation valve assembly to the bottom of the valve body.
- Coat the threads of the bonnet bolts with never seize, insert the bolts through the bonnet, and tighten evenly until the bonnet seats on the valve body.
FAQ
- Q: How often does a piston valve require maintenance?
- A: A piston valve can retain its leak tightness for several years without maintenance. However, in severe service conditions such as rapid heating and cooling, some field maintenance may be required.
- Q: Where can I obtain the special valve sealing ring extractor tool?
- A: The Part No. A9542 special valve sealing ring extractor tool is available from Armstrong International, Inc.

Operation

In a piston valve, the control of stem and seat leakage is obtained by tightness of the valve sealing rings to the body and valve plug.
The bonnet compresses the valve sealing rings against the body and the valve plug.
Flexible disc springs automatically ensure a tight seal by exerting pressure on the valve sealing rings, keeping them compressed.

Opening and Closing the TVS Isolation Valves

The isolation valve begins to stop flow when the valve plug enters the lower valve sealing ring.
When the isolation valve is completely closed, the valve plug is in contact with the full height of the valve sealing rings, ensuring the best possible seal.
There is no advantage to be gained in torquing the valve closed.
Armstrong recommends that after closing the isolation valves completely, the handwheel should be turned back one-half turn.
This makes it easy to re-open the valve by avoiding metal-to-metal seizure.

Troubleshooting

Troubleshooting – Isolation Valves

A piston valve will retain its leak tightness for several years without maintenance. In severe service, such as rapid heating and cooling, some field maintenance may be required. Depending on the problem, these simple steps may help:
Isolation Valve leaks, when the valve is closed. First, Check to make sure the valve is closed.
Check to see if the bonnet is seated on the body, if not, tighten the bonnet nuts until the bonnet seats. This recompresses the valve sealing rings against the body and the valve plug. If the valve continues to leak, replace the isolation valve assembly.
Isolation Valve stem leaks. Same above.
Maintain the isolation valve as soon as leakage starts. Internal leakage can wear the valve plug or valve sealing rings and they will have to be replaced if leakage continues.
- Caution: Before tightening the bonnet bolts, make sure the isolation valve is in the closed position.

Replacing the Isolation Valve Assembly

Special Extractor Tool Required DO ——— Do not attempt to replace the valve sealing rings without the Part No. A9542 special valve sealing ring extractor tool. This tool is available from Armstrong International, Inc.

Removing the valve seal rings, lantern bushing, and valve washers.
This can be done with the TVS811 Trap Valve Station remaining in the steam line. Be sure to isolate the TVS811 Trap Valve Station both up and downstream by using separate shut-off valves before performing any maintenance.
Using the TVSís handwheels, open each valve until it stops.
Loosen and remove the bonnet bolts.
Pull isolation valve assembly out of valve body.
Place the special valve sealing ring extractor into the body of the valve and turn the top square nut of the special valve ring extractor with a wrench to allow the spindle to expand under the valve washer.
Tighten the lower nut of the extractor and pull the extractor out of the valve body. The disc springs, valve sealing rings, and lantern bushing will come out on the end of the extractor.
Check to see if all components including the valve washer at the bottom of the valve body have been removed. Inspect and clean any debris that might have remained in the valve body.

Installing New Isolation Valve Assembly

Place valve washer into valve body with Beveled Edge down.
Place Armstrong Part No. B5249 isolation valve assembly into the valve body.
Lightly tap the isolation valve assembly to the bottom of the valve body.
Coat the treads of the bonnet bolts with never seizeî, insert bolts through the bonnet, and tighten evenly until the bonnet seats on the valve body.
Check the isolation valve for proper operation by opening and closing the valves one or two times leaving them open.
Open separate shut-off valves up and downstream from the Trap Valve Station and check for leaks.

Contact Armstrong International or your local representative if you have questions regarding the installation, use, or repair of the Armstrong Model TVS811 Trap Valve Station.