I N S T R U C T I O N S
For the installation and maintenance of D C 1 5 2 5 - D C 1 5 5 0
d e s u p e r h e a t e r s
IMI0049E.doc
Rev.0 20/08/14
20090 SEGRATE (MI)- via E.Fermi
EMAIL:
TEL.(02) 269912.1 - FAX.(02) 2692.2452
Page 12 of 16
9.1
REMOVAL
Before removing the desuperheater from the system, check that the process and liquid pipes are
completely depressurised, drained and bled. Bleed and remove the air supply line to the instrumentation.
Loose the studs on the liquid and process gas flange and remove the desuperheater from the system. It
is advisable to move the unit to a workshop.
Lift the unit using suitable slings wrapped round its body. Do
not attempt to lift it by the actuator or any other accessories. The coupling of the stem varies according to
the type of actuator installed.
9.2
DISASSEMBLY
Varicryo is suitable for severe conditions of use and therefore more subject to wear parts maintenance. It
is designed in quick-change version with the possibility of easy replacement of components without trim
threaded or welded. If it is only necessary to replace the trim when the disconnected actuator can be
removed after unscrewing the cap screws (15 of item 26) and then remove from all internal
components including the seat and stem-plug assembly. They also recommend replacing all the
gaskets and piston rings.
The nozzle head can be disassembled more easily if it is positioned horizontally with the section of the
body extension firmly gripped in the vice. Grind the weld points on the nozzle, with a standard angle
grinder. Check that the weld has been sufficiently removed to allow unobstructed rotation of the tightening
ring. Unscrew the tightening ring by turning it anti-clockwise. Note that the body extension has a right-
hand thread. To facilitate removal of the ring, tap it gently with a hammer. Note that the spray cylinder has
a left-hand thread. In the event of difficulty in removing the tightening ring, grind it at two diametrically
opposed points. Take care not to damage the thread of the body and of the cylinder (see Fig. 6).
Fig. 6
