GESTRA UNA 46, Original Installation Instructions

Page: 10 / 52

10
The limiting conditions and pressure &
temperature ratings specified in this
installation manual are applicable for
standard equipment. Note that these
values may differ for modified or
customized equipment.
All equipment specific values are indicated
on the nameplate.
Application of European Directives
Pressure Equipment Directive
The equipment conforms to this directive (see
"Manufacturer's Declaration" section) and can be
used for the following media:
UNA 45

Fluids of group 2
UNA 46 and UNA 46A

Fluids of group 1

Fluids of group 2
UNA 47

Fluids of group 1

Fluids of group 2
ATEX Directive
The equipment does not have its own potential
ignition source and is not subject to this directive
(see "Manufacturer's Declaration" section).
When installed, static electricity may arise between
the equipment and the connected system.
When used in potentially explosive atmospheres,
the plant manufacturer or plant operator is
responsible for discharging or preventing possible
static charge.
If it is possible for medium to escape, e.g. through
actuating mechanisms or leaks in threaded joints,
the plant manufacturer or plant operator must take
this into consideration when dividing the area into
zones.
Task and function
Purpose
Type UNA 45, UNA 46, UNA 46A and UNA 47
models are used to discharge condensate from
water vapour on steam-heated consumers.
Type UNA 45 models can also be used to discharge
condensate from compressed air.
Type UNA 46, UNA 46A and UNA 47 models can
also be used to discharge condensate from other
gases or gas mixtures.
Function
A float ball opens the orifice based on the fill level.
This regulates the drainage rate. With the orifice
opened to maximum, the drainage rate depends on
the diameter of the orifice.
Models with SIMPLEX control unit are particularly
suited to cold condensates and superheated steam.
Models with SIMPLEX-P control unit are controlled
by the float with rolling ball regulator. The
Perbunan
®
roller ball ensures a good seal at the
seat. Models with this control unit are particularly
suited to cold condensates and cold distillates.
Models with DUPLEX control unit also vent the
system. The DUPLEX control unit consists of the
float with rolling ball regulator and an additional,
temperature-dependent bimetallic vent. Venting on
UNA 45, UNA 46 and UNA 46A occurs via the
control membrane, and via bimetallic vent on
UNA 47. Models with this control unit are
particularly well suited to saturated steam systems.
On UNA 45, UNA 46 and UNA 46A devices with
DUPLEX control unit and control membrane, the
superheated steam at the control membrane must
not exceed 5 K.
You can lift the float manually using the optional
manual lifting lever.
The optional manual vent valve allows you to vent
the pipe manually.
The externally adjustable internal bypass is used to
set a bypass flow. This is routed inside the device
past the control unit.