Spirax Sarco K Series User Manual

IM-S24-15 CH Issue 4
13
4. Maintenance
4.1 Periodic maintenance
After 24 hours of operation
After 24 hours of operation check the flange bolts for tightness.
On valves with graphite stem seal packing compress the gland seal packing by tightening
the gland nut by ¼ of a turn. Care should be taken not to overtighten as this may cause the
spindle to lock-up.
Every 3 months of operation
Every 3 months of normal operation check the stem gland seal for leakage. In the case of
leakage proceed as follows:
- For valves with a PTFE gland seal renew the gland seal by following the procedure in
Section 4.2.
- For valves with a graphite stem seal packing compress the gland seal packing by tightening
the gland nut by ¼ of a turn. If leakage cannot be eliminated, renew the graphite gland seal
by following the procedure in Section 4.3.
Annually
Inspect the valve to check for wear or scale deposits. Worn or damaged parts, like the plug
or seat may need to be replaced, as well as the gland seal packing.
The graphite packing is normally subject to wear. Therefore it is recommended to renew the
packing rings annually.
Table 1 Recommended tightening torques N m (lbf ft)
Size Seat (4) Bonnet nuts (15)
Gland nut
(chevron seals) (9)
DN15 (½") 40 ±5 (30 ±4) 30 ±1.5 (22 ±1) 25 - 30 (19 - 22)
DN20 (¾") 53 ±3 (39 ±2) 30 ±1.5 (22 ±1) 25 - 30 (19 - 22)
DN25 (1") 80 ±5 (59 ±4) 40 ±2 (29 ±1.5) 25 - 30 (19 - 22)
DN32 (1¼") 130 ±5 (96 ±4) 45 ±2 (33 ±1.5) 25 - 30 (19 - 22)
DN40 (1½") 220 ±5 (160 ±4) 45 ±2 (33 ±1.5) 25 - 30 (19 - 22)
DN50 (2") 150 ±5 (110 ±4) 65 ±3 (48 ±2.5) 25 - 30 (19 - 22)
DN65 (2½") 300 ±12 (220 ±9) 65 ±3 (48 ±2.8) 32 - 38 (24 - 28)
DN80 (3") 400 ±16 (295 ±12) 60 ±3 (44 ±2) 32 - 38 (24 - 28)
DN100 (4") 600 ±24 (442 ±18) 60 ±3 (44 ±2) 32 - 38 (24 - 28)
DN150 (6") 678 (500) 488 (360) 81 (60)
DN200 (8") 678 (500) 488 (360) 81 (60)
KEA61 and KEA63 Warning
The 316 type stainless steel used in the construction of this product 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 lighter smear of a PTFE based grease
is applied to any mating parts before reassembly.

Spirax Sarco K Series Specifications

General

Brand	Spirax Sarco
Model	K Series
Category	Control Unit
Language	English