3.696.5275.210
45
Modulating Control Valve (Primary Side) - Inspection and Replacement
(Fig. 29)
The Modulating Valves are installed on the primary steam inlet side. The documentation
included with the unit gives specifics for operation and maintenance of the control valve.
The drawing included with the unit will give the exact location, as well as the relation with
other components. This information should be reviewed before removal / replacement of
the valve.
∆
Steam, or high temperature water present situations that can be very
dangerous because of the high temperatures and pressures and follow all accepted
and recommended procedures when performing installation, operation, and
maintenance procedures to avoid possible injury or death.
∆
The combination of electricity, steam, and water can pose a very dangerous
situation. Turn off / disconnect all electric power before attempting any maintenance
procedures.
Routine maintenance procedures
(document ref.: IM-S24-42)
24 hours operation
After 24 hours service check pipework connections and flange bolts for tightness. With
valves having high temperature graphite packed gland seals the gland nut should be
tightened by approximately ¼ of a turn taking care not to over tighten as this may cause
excessive friction on the valve stem.
3 months operating intervals
After every 3 months normal service visually check gland seals for signs of leakage and if
necessary take the following corrective action. Valves having chevron gland seals remove
and replace the PTFE chevron seals. Valves having high temperature graphite packed
gland seals tighten gland nut approximately ¼ of a turn taking care not to overtighten as
this may cause excessive friction on the valve stem. If no adjustment remaining, replace
the graphite gland seal as described in paragraph 5 of the product IMI.
Annually
The valve should be inspected for wear and tear replacing any worn or damaged parts such
as valve plug and stem, valve seat and gland seals. High temperature graphite packed
gland seals are subject to wear during normal operation. It is therefore recommended that
the graphite packing is replaced during this routine inspection to prevent premature failure
of the gland seals during normal operation.
Fig. 29
Valve
Summary of Contents for CSM-C
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