Flowserve UNA 38 - Manual (Page 17)

7
Retrofitting
GESTRA steam traps can be retrofitted with different control units.
WINIX ® 50 is a registered trademark of WINIX GmbH, Norderstedt
Cleaning /exchanging the control unit
. Take heed of the “Danger” note on page 4.
. Undo the hexagon nuts
A, remove the sleeves B from the expansion bolts P, and take off
the cover M.
3. Undo the union nut X and take it out of the body together with the control unit E, r or ; (UNA 38);
alternatively, undo and remove the hexagon socket-head screws T, and take out the control unit
r or ; (UNA 39).
4. Replace the control unit in case of visible signs of wear or damage.
5. Clean the body, internals and all gasket surfaces.
6. Apply heat-resistant lubricant to all threads and the seating surfaces of the control unit and cover
(use e.g. WINIX ® 50).
7. Attach the control unit E, r or ; (UNA 38) with the union nut and align it within the body so that the
float ball can move vertically. Tighten the union nut. Insert a new gasket U for control unit r or ;
(UNA 39), put on the control unit and tighten the hexagon socket-head screws T evenly crosswise.
For the torques, see the table “Torques” on page 6.
8. Insert a new body gasket Q.
9. Put the cover onto the body and push the sleeves B onto the expansion bolts P. Tighten the
hexagon nuts A evenly crosswise in several stages to the values specified in the “Torques” table.
2 2
2 2
Tools
n Combination spanner A.F. 7, 9, , 4, 30, 46 mm to DIN 33, form B
n Allen key A.F. 5, 8 mm to ISO 936
n Torque spanner 0–60 Nm, 60–0 Nm, 0–300 Nm to DIN ISO 6789
Torques
Item Designation
Torque [Nm]
UNA 38 UNA 39
A Hexagon nut 70 340
T Hexagon-socket screw (UNA 39) 40
X Union nut (UNA 38) 0
P Expansion bolts 0 0
C Bimetallic air vent 90
I Hand vent valve 70 70
K Float lifting lever 0
O Plug 70 70
F Plug 0