3
6. Connect air supply and instrument signal
(air or mA) lines. Throttling control valves
are equipped with a valve positioner. Two
connections are marked: One for the air
supply and the other for the instrument
signal. Both the actuator and positioner are
suitable for 150 psi/10.3 Bar air supply. An
air regulator is not required unless the
supply pressure exceeds 150 psi/10.3 Bar.
The air filter should be installed before the
positioner unless the supply air is unusually
clean and dry.
CAUTION:
On valves equipped
with air filters, the filter
must point down for proper
performance.
Note:
In some unusual cases, air supply must
be limited to less than the previously
mentioned amount of 150psi/10.3 Bar. In this
case, a sticker found near the upper air port
on the actuator cylinder will indicate this and
an air regulator should be installed to insure
that the supply pressure does not exceed the
line pressure indicated on the sticker.
MAINTENANCE
Valve parts are subject to normal wear and
must be inspected and replaced as necessary.
Inspection and maintenance frequency
depends on the severity of service conditions.
This section contains preventive maintenance
steps which can be performed while the valve
is still in-line and, in some cases, still in
service. If a problem is suspected of being
internal, refer to the Assembly/Disassembly
section.
1. Inspect end flanges and bonnet for signs of
gasket leakage. Tighten flange and bonnet
bolting (if required). See Table 4
2. Check the pressure-balance sleeve, metal
bellows seal, body drain plug, etc. (if
included) for fluid leakage to the
atmosphere.
3.
Keep valve clean and repaint areas
affected by severe oxidation
4. Examine the valve for damage caused by
corrosive fumes or process drippings.
5. Check lubricant supply and add lubricant if
necessary. See Table 3 for common
lubricants.
6. Packing box bolting must be slightly over
finger-tight. Tighten only as necessary to
prevent stem leakage.
CAUTION:
Do not over-tighten
packing. This may cause
excessive packing wear and
high stem friction, which can
Product In
s
truction Manual
Lubricant
Krytox 206
GP 460
Aeroshell
Grease 7
Garlock
Luball
Manufacturer
E.I. DuPont
Graphite
Products Co.
Shell Oil Co.
Garlock Inc.
Temperature Range
-5º to 550º F /
-20º to 285º
32º to 1000º F /
0º to 540º C
-100º to 300º F /
-75º to 150º C
32º to 500º F /
0º to 260º C
Description Applications
Fluorinated general purpose grease; handles common
liquids and gases; good lubricity in harsh mediums; non-
flammable, chemically inert; will not harm plastic or metal
parts
Graphite in petrolatum; high pressures; anti-galling,
graphite remains above 600º F/ 316º C
Synthetic oil based; low temperature applications
General purpose molybdenum disulfide lubricant
economical; good in water, steam and common chemicals;
not good in harsh mediums where Krytox 206 is
recommended
Table 3: Common Lubricants