Non-Return Valve - Diehl Metering HYDRUS 171A Guide D'installation

HYDRUS
ƒ
The meter must be fitted so that is protected against all outside impu-
rities and contamination.
ƒ
Remove old seals and clean sealing faces.
ƒ
Thinly grease sealing faces (use acid-free, potable-water approved
grease).
ƒ
Only fit the newly supplied seals (the seals should not intrude into
the pipeline).
ƒ
Site-provided seals must be suitable for the purpose and comply with
the local guidelines and directives. No liability is accepted for conse-
quential damage resulting from the use of third-party seals such as
corrosion to sealing surfaces and threads.
ƒ
Simultaneously manually screw home the meter fittings on both sides
and then tighten in opposing directions using a suitable tool (mini-
mum torque 30 Nm, maximum torque 50 Nm).
ƒ
Depending on the version, the meter is suitable for water tempera-
tures from 0.1 °C to 90 °C.
ƒ
Slowly fill the pipeline with water on completion of the installation.
ƒ
The meter must always be filled full with water.
ƒ
The meter must be protected against pressure shocks in the pipeline.
ƒ
The meter may only be installed in frost-free areas.

Non-return valve

ƒ
The meter can be supplied with a non-return valve (accessory) on
request (nominal diameter DN 15 - DN 40).
ƒ
The non-return valve must be mounted in the meter outlet as shown
in fig I for meters with a nominal diameter of DN 15 or fig II for
meters with a nominal diameter for DN 20 and DN 40 or larger.
ƒ
For meters with a nominal diameter of DN 25/32, a compensating ring
must be used to centre the non-return valve. (fig. III).
Coupling fitting with collar
ƒ
In order to prevent damage to the non-return valve, there is a PE
seal for the non-return valve (Fig. II and III) and coupling fitting with
collar combination.
During the installation, the water meter must be held in this
position (see fig. III) with a suitable tool to prevent damage to
the plastic housing.
-16-
Deutsch
English
Français Português