Flowserve UNA 38 - Manual (Page 15)

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WINIX ® 50 is a registered trademark of WINIX GmbH, Norderstedt
Maintenance
GESTRA steam traps of the type UNA do not require any special maintenance.
However, if the steam trap is to be used in a new installation which has not been flushed yet,
it is advisable to check and – if required – clean the trap.
The UNA steam traps can be checked for steam loss during operation by using the GESTRA ultrasonic
measuring unit VAPOPHONE
® or TRAPtest ® .
In case of steam loss, clean the valve and/or replace the control unit or orifice.
Checking the steam trap
Cleaning/exchanging the control unit
. Take heed of the “Danger” note on page 4.
. Undo the hexagon nuts
k, remove the sleeves l from the expansion bolts z, and take off
the cover w.
3. Unscrew and remove the bimetallic air vent C; take out the gasket D.
4. Install a new bimetallic air vent C together with a new gasket. For the torque, see the table “Torques”
on page 6.
5. Insert a new body gasket :.
6. Put the cover onto the body and push the sleeves l onto the expansion bolts z. Tighten the hexagon
nuts k evenly crosswise in several stages to the values specified in the “Torques” table.
Changing the bimetallic air vent (UNA 38)
. 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