Armstrong TVS 4000 Manuale di installazione e funzionamento - Pagina 3
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Troubleshooting – TVS 4000/F 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 actually closed. Check to see if
bonnet is seated on the body, if not, tighten the bonnet bolts until the bonnet seats. This compresses the valve sealing
rings against the body and the valve plug. If valve continues to leak, replace the isolation valve assembly.
Valve stem leaks. Same as above.
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: Before tightening the bonnet bolts, make sure the valve is in the closed position.
Test valve leaks. Reseat with 40-50 ft. lbs. torque.
Removing the bonnet assembly, valve sealing
rings, lantern bushing and valve washers.
This can be done with the TVS 4000/F Trap Valve Station remaining in the steam line. Be sure to isolate the TVS 4000/F
Trap Valve Station both up and down stream by using separate shut-off valves before performing any maintenance.
Open TVS 4000/F Isolation Valves
Open the bleed valve all the way slowly to depressurize trap and then open the test valve all the way until it stops.
Loosen and remove the bonnet bolts.
Pull bonnet assembly out of valve body.
Remove valve sealing rings, valve washers and lantern bushing using a Packing Hook. Check to to see if all
components, have been removed. Inspect and clean any debris that might have remained in the valve body.
Installing New Isolation Valve Assembly
Place Armstrong Part No. B7024 or SS handwheel part number D152592 isolation valve assembly in valve body.
Lightly tap the isolation valve assembly to the bottom of the valve body.
Coat the treads of the bonnet bolts with "never seize", insert bolts through bonnet and tighten evenly until the bonnet
seats on the valve body.
Check the TVS 4000/F isolation valve for proper operation by opening and closing the valve one or two times leaving
them in the open position.
Open isolation valves up and down stream from the Trap Valve Station and check for leaks with trap installed.
Must seat on body
TVS 4000/F Isolation
Valve Assembly
Part No. B7024 or SS handwheel
Part No. D152592
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