Operating Instructions for ERHARD NON SLAM Nozzle Check Valve
Attention !
Follow direction of installation
according to the cast-on arrow!
The valve opens in case of flow from A to
B and closes in reverse direction from B to
A, thus preventing backflow!
Fig. 1.7
There must be free access all around the valve for operation and maintenance.
Prior to installation into the pipeline the function of the ERHARD NON SLAM Nozzle
Check Valve can be checked by pressing the obturator onto the stop of the internal
body. When releasing the obturator, the obturator must be pressed into the seat by the
spring, completely and automatically. (Check installation position accordingly.)
Fig. 5.2 Standard nameplate
Installation in horizontal and vertical pipeline is
possible. For installation in vertical pipeline with
upward flow a standard spring is used as for
installation in horizontal pipeline. The installation
position is marked on the nameplate (5.2). The
springs for the standard case (
→
↑
) are marked
accordingly – like all the other springs.
A special spring is used for installation in vertical
pipeline with downward flow (
↓
). In this case, the
internal body has an additional bore.
ERHARD NON SLAM Nozzle
Check Valve
Serial No.: 000000/00/00
Admiss.work.pressure PFA __bar
Flanges PN ??
Sealing material: NBR
Spring: standard
Position of installation:
→↑
During installation of the valve, the distance between the pipe flanges should exceed
the valve face-to-face dimension by at least 20 mm. Thus, the raised faces will not be
damaged and the gaskets can be inserted. Up to PN 16 textile reinforced rubber seals
are recommended for use as flange gaskets. Steel-reinforced rubber seals are
recommended for PN 25 and higher. For slip-on flanges, they are absolutely
necessary. (Consider resistance to flow medium and temperature.)
The mating pipe flanges must be plain-parallel and concentric.
Tighten the connecting bolts evenly (without distortion) and crosswise. The pipeline
mustn't by any means be pulled up to the valve.
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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