UNIWORLD Series
M/UNIWORLD-P/E ed. 01 2020
3.4.2.3
– VALVES 2600 – 2700 - 5600– 5700
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 2600-2700-5600-5700
, the replacement operation of the packing can only be carried out with the valve
dismantled from the tubing.
Give air, at a pressure that allows the valve to perform a few millimetres of stroke, to distance the plug from the
two compartments, considering half stroke as the ideal position.
Fig. example “
2600 DA
– 5600 DA
”, proceed as follows:
Unscrewing the plug locking nuts ref. 3 with the relevant washer ref. 4, if the valve is model 2600-5600, the plug remains
inside the compartments (same applies for 5700 DN15-20 ), then unscrew the locking nuts ref.17 and remove the
servomotor / bonnet / trim assembly, then proceed as follows:
remove the complete bonnet ref.7 and proceed to replace the packing as indicated in Fig. “PACKING” page 11
EXCEPTIONS:
1. On diameters DN125-200 this operation involves removal of the bonnet with the closure floating flange.
If the valve is model 2700
– 5700 DN25-200, the lower profile ref. 5 – see figure example “2700 RA – 5700 RA” page
10, it will be removed from the stem and remain in hand together with the locking nuts and relevant washer.
Then, the servomotor / bonnet / trim assembly can be removed.
For 5700 type valves, you are always advised to firstly remove the trunk ref.1°, to facilitate the unscrewing operation of
the internal nuts and obviously to replace the lower gasket of the trunk.
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 orde
r, see Fig. “PACKING”.
Then, proceed to assemble in the reverse order.
3.4.3
– REPLACEMENT OF THE PLUG PROFILE - SOFT SEAL and COMPARTMENT
ATTENTION
IF THE VALVE IS FITTED WITH A SOFT SEAL, CONSIDERING THE COMPLEXITY OF THE
OPERATIONS FOR TRIM REPLACEMENT, YOU ARE ADVISED TO CONTACT OUR SUPPORT SERVICE.
EXCEPTIONS:
1. The UNIWORLD valves compartment is screwed onto the valve body with sealing paste. To replace it, the
entire valve body must be changed.
2. For 3-way valves Type 2600-2700-5600-5700, replacement of the plug profile and the compartments must be
carried out in our plant due to the complexity of the procedure.
3. For 2-way valves Double Seat Type 5800, replacement of the plug profile and the compartments must be
carried out in our plant due to the complexity of the procedure.
For
DIRECT ACTING valves (DA= air closes)
,
DOUBLE EFFECT (DE)
Fig. “
2000 DA
– 5000 DA
”, page no.7 proceed
as follows:
unscrew the locking nuts ref. 17 that tighten the yoke ref. 18 for version 5000 DA always unscrew the lower nuts ref. 17
that tighten the lower flange ref. no. 1a, at the same time remove the overall servomotor with the bonnet and trim
connected, unscrew the nuts ref.4 and remove the washer ref.4, then remove the plug profile ref.5 and change the
profile.
THE SAME PROCEDURE MUST ALSO BE APPLIED TO REPLACE THE SOFT SEAL. IN THIS CASE, REMOVE THE
PROFILE AND REPLACE THE SOFT SEAL RING IN PTFE or PTFE/GR FITTED IN THE BOTTOM
– see “SEAL
TIGHTENING FORCES TABLE”
When the profile is changed, the body gasket must also be changed, see 3.4.1
Proceed to assemble in the reverse order.
For
REVERSE ACTING valves (RA= air opens)
, Fig. “2000 RA” – “5000 RA” page no. 11, to replace the gasket of the
body, proceed as above, taking care however to unscrew the locking nuts ref. 17,
to supply air, at pressure that
allows the valve to execute a few millimetres of stroke, to distance the plug from its compartment.
SOFT SEAL TIGHTENING FORCES TABLE
DN 15-20
DN 25-32
DN 40-50
DN 65-100
DN 125-200
6/7 Nm
8/9 Nm
9/10 Nm
8/9 Nm each screw
9/10 Nm each screw
