Spirax Sarco Spira-trol K Series, Installation And Maintenance Instructions Manual

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IM-S24-42 CTLS Issue 10
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Note: Before actioning any installation, observe the 'Safety information' in Section 1.
Warning for all stainless steel valves
The 316 type stainless steel used in the construction of these products particularly for screwed or
close fitting parts, is very susceptible to galling or cold welding. This is an inherent characterisitic
of this type of material and great care should therefore be taken when dismantling or reassembling.
If the application permits, it is recommended that a light smear of a PTFE based grease is applied
to any mating parts before reassembly.
4.1 General
Valve parts are subject to normal wear and must be inspected and replaced as necessary. Inspection and
maintenance frequency depends on the severity of the service conditions. This section provides instructions
on replacement packing, stem, plug and seat and bellows. All maintenance operations can be performed
with the valve body in the line.
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, refer to Section 6 'Spare parts'.
Note 1: High temperature graphite packed seals are subject to wear during normal operation. We therefore
recommend the graphite packing be replaced during this routine inspection to prevent premature failure of
the packing during normal operation.
Note 2: It is recommended that all soft seals and gaskets be replaced whenever the valve is disassembled.
Table 1 Recommended tightening torques - Control valve sizes DN15 to DN100
Spira-trol
TM
valve size
Torque (N m)
LE
LEA, KE
and KEA
DN15 - DN25 70 100
DN32 - DN50 90 130
DN65 - DN80 110 130
DN100 110 130
1 3
4 2
Fig. 5 Bonnet tightening sequence
4. Maintenance : DN15 to DN100