Operating Instructions for ERHARD NON SLAM Nozzle Check Valve
Fig. 2.3.2
DN 350 – 600:
For removing the internal body (2) from
the body (3), a force of approx. 40 kN
is required. This force can be applied
by means of a press, an auxiliary
mounting tool or similar device as
shown in fig. 2.3.2.
The tool is centrally placed on the
pushed back valve ring so that the
bolts (4) required for expulsion are
centrally arranged on the width of the
valve ring. The two fastening bolts are
tightened in two opposite flange holes
with washers and nuts, parallel to the
raised face.
The internal body is pressed out of the
main body, screwing-in the bolts (4) in a
slow and uniform manner. When
screwing-in, the corresponding nuts
have
to be secured against following the
bolts. When pressing the internal
body out of its position, it should be
held
in order to avoid damage to the coating.
Assembly DN 80 – 600:
During assembly, internal body, valve disc (ring), spring(s), and guiding stem(s) are
pushed into the internal body. The valve disc (ring) can be fixed in its rear limit position
by means of bolt(s) including washer(s) (5), screwed into the guiding stem(s). The fitting
surface (fig. 2.4) of the internal body, has to be cleaned. The body’s fitting surface which
must also be cleaned has to be covered with sealing agent BA5
on the two transitions
to vitreous enamel as well as in the groove in which the threaded pins are engaged.
After having pushed the internal body into the main body, the threaded pins have to be
secured with BA5, too, and screwed into the groove. The internal hexagon of the
threaded pins is filled with BA5 in order to ensure further screwing off. Excessive
sealing agent must be removed from both transitions and be smoothed. For mounting
the internal body in the main body, see also fig. 2.4.
1
Sealing agent BA5
Loctite Deutschland GmbH
Type: screw locking, medium strength
Art.-No. 24374
BA43E000
Juli 2009
Rev.9
ERHARD GmbH & Co. KG
x
D-89502 Heidenheim
x
Postfach 1280
Telefon: (07321) 320-0
(07321) 320 491 E-Mail: info
@
erhard.de
Internet: http://www.erhard.de
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