UNIWORLD Series
M/UNIWORLD-P/E ed. 01 2020
“2700 RA”
“5700 RA”
3.4.2
– PACKING REPLACEMENT
3.4.2.2
– VALVES 2000 – 2100 - 5000– 5100 - 5800
ATTENTION
IF THE VALVE IS FITTED WITH A SOFT SEAL, CONSIDERING THE COMPLEXITY OF THE OPERATIONS
FOR PACKING AND BELLOWS REPLACEMENT, YOU ARE ADVISED TO CONTACT OUR SUPPORT SERVICE.
The operation to replace the packing involves dismantling the trim.
For
Types 2000-2100-5000-5100-5800
, the replacement operation of the packing can be carried out with the valve
assembled on the tubing.
For
DIRECT ACTING (DA= air closes) and DOUBLE EFFECT (DE) valves giving air is not necessary
For
REVERSE ACTING valves (RA = air opens) give air, at a pressure that allows the valve to perform a few
millimetres of stroke, to distance the plug from its compartment.
Fig. “2000 RA” – “5000 RA” proceed as follows:
unscrew the locking nuts ref. 17 that tighten the yoke ref. 18, at the same time remove the overall servomotor with the
bonnet and trim connected and then proceed as follows:
unscrew the nuts ref. 4 with the washer ref.3, extract the plug profile ref. 5, remove the complete bonnet ref.7 and
proceed to replace the packing, as
indicate din the Fig. “PACKING”.
EXCEPTIONS:
1. On diameters DN125-200 this operation involves removal of the bonnet with the closure floating flange.
2. On valves Type 5800 the plug is integrated with the stem, therefore it should be unscrewed from the servomotor
shaft
When the packing is changed, the body gasket must also be changed, see 3.4.1
Then proceed to assemble the new packing following the previous operations in the reverse order, see Fig. “PACKING”.
Proceed to assemble the components in the reserve order.
