Operating Instructions for ERHARD NON SLAM Nozzle Check Valve
ERHARD NON SLAM Nozzle Check Valves DN 350 - 600:
1. Completely mounted unit (if
necessary): rubber-coated valve
ring (1) with 4 guiding stems (2) and
washers (5).
2. Springs (3)
(if necessary) 4 pieces
4. Bushes (4) 4 or 8 pieces
Fig. 2.2
2.3 Replacement of the spare parts / necessary tools
For replacing above mentioned wearing parts, the ERHARD NON SLAM Nozzle Check
Valve has to be removed from the pipeline after having depressurized the pipeline. The
internal body (2) is secured in the body (3) in the following manner:
- for sizes DN 80 to 300 with 3 threaded pins M6 with internal hexagon 3 mm (1),
- for sizes DN 350 to 500 with 4 threaded pins M6 with internal hexagon 3 mm (1) and
- for size DN 600 with 4 threaded pins M8 with internal hexagon 4 mm.
These pins must be screwed off.
Fig. 2.3.1
DN 80 – 300:
For removing the internal body (2) from
the body (3), a force of approx. 20 kN
is required. This force can be applied
by means of a press, an auxiliary
mounting tool or similar device as
shown in fig. 2.3.1.
The tool is centrally placed on the
pushed back valve disc, both 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 by means
of the central bolt (4). When pressing
the internal body out of its position, it
should be held in order to avoid
damage to the coating.
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
Page 16 of 18
