Flowserve Valtek Torex TX IOM - Manual (Page 6)

Torex TX VLEEIM4143-02 09.10
6
8. Spare parts
State the following data when ordering spare parts:
1. Product code of the valve - incl. DN according to
VLEETB4143 and the Manuf. No. specified on
the identification plate of the valve.
Ordering example: 2382BB-0200-BAAABA
manuf. No 1234567,
Seatring item10.
Quantity 1 st.
9. Maintenance
If the valve disc or seat ring has sustained damage due to
impurities in the pipework or for some other reason, or if
the seat ring and stem seals need replacing after a long
period of service, the valve must be overhauled.
Many valves are installed in such locations that their
performance is of decisive importance to the entire
process. Such valves should be inspected regularly and
any faults should immediately be corrected.
9.1 To remove the valve from the pipework
The procedure for inspection and maintenance, for which
no special tools are necessary, is as follows:
Ensure that the valve is not under pressure.
1. Ensure that the recommended spare parts and
also the gaskets for the pipe flanges are
available.
2. Close the valve.
3. Shut off all compressed air connections and
isolate all electrical connections to the actuator.
4. Disconnect all compressed air lines and electric
cables connected to the actuator.
5. Note the direction of flow which is shown by an
arrow on the valve body.
6. Release the flanged joint between the valve and
the pipework. Then lift out the valve. Apply all
lifting forces to the valve itself and not to the
actuator.
9.2 To change an Inconel seat ring
If an actuator is fitted to the valve, it need not be removed
for inspection and replacement of the seat ring.
1. Set the valve to the fully open position.
2. Remove the bolts, clamp ring (6), gasket (8) and
seat ring (10). Use the two tapped holes
(M6) in the retainer ring to remove the ring from
the valve body.
3. Carefully wash all parts. First use warm water
and then, if necessary, a suitable solvent. Do not
scrape any of the machined surface with hard
tools.
4. Examine the surfaces on the periphery of the
valve disc. Minor scratches and marks on the
sealing surface can be rubbed down with emery
paper.
5. Inspect the seat ring. During such overhauls, it is
always advisable to fit a new seat ring.
6. Refit the gasket (8).
7. Spray the valve disc, sealing surface and seat
ring with a suitable lubricant, such as Molykote
321 R or Gleitmo 900 or Unimoly C 220. Allow
the lubricant to dry for at least 15 minutes.
8. Fit the seat ring (10) and clamp ring (6) into
the valve body.
9. Screw in the retainer ring bolts, but don’t tighten
the retainer ring.
10. Check that the A-measure is correct according to
9.4.
9.3 To replace PTFE seat rings.
1-4 See the corresponding items in section 9.2.
5. Carefully clean the groove in the body into which
the seat ring is mounted.
6. Make sure that the PTFE seat ring is mounted
with its L - shaped (or the sharp corner) side
towards the retainer ring.
7. The disc must be turned 180˚ before the retainer
ring is placed in the valve. When the seatring is
correctly positioned into the retainer ring, place
the package in the valve.
8. Carefully fasten the retainer ring, but do not
tighten it.