Armstrong TVS 6000UD Посібник з монтажу та експлуатації - Сторінка 6
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Troubleshooting TVS 6000UD
Isolation Valves and Bleed, Test and
Blowdown 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(s) (A-A' and/or G-G') leak when the valve(s) is(are) closed.
- First, check to make sure the isolation valves are completely closed. Then, check to see if the bonnet is seated on the body of
the connector block. If not, tighten the bonnet bolts until the bonnet seats. This will allow the bonnet bolts to compress the
valve sealing rings against the body and the valve plug. If the valve(s) continue to leak, replace the isolation valve assembly.
• Valve stem leaks.
- See above instructions.
• Maintain the isolation valves 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!
• Bleed (B&H), test (F) and blowdown (D) valves leak. Reseat with 55-80 N-m torque.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
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Before tightening the bonnet bolts, ensure the isolation valve is in the closed position.
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